Airbus green dot speed calculator Not sure why Tech Log - Airbus approach phase activation - Good Day Gentlemen, There has been some debate over when the activation of the approach phase should be activated during the course of descent down to the destination. Fenix A320 Tutorial: Airbus GREEN DOT Speed Explained by a Real Airbus Pilot! MSFSA real Airbus pilot explains the green dot speed in the Airbus using the Fe The green dot speed is the speed at which one gets best lift/drag ratio (clean aircraft). This tool helps to create the takeoff performance for Airbus aircrafts such as V1, VR, V2, Takeoff Trim, Flex Temp. It varies depending on your weight, altitude, air temperature, atmospheric pressure, etc. How TCAS works and how airline pilots O : Green dot speed. , so basically the FACs compute every speed on the speed scale? airbus-a320; Share. Most aircrafft are tested to 5% above Vne. The Toliss A321 follows Managed Speed target . e after thrust red/ acc and speed towards s speed. Green Dot speed Green Dot (GD) is a ight speed estimation that maximizes the lift-to-drag ratio for a given aircraft’s altitude and weight. Also corresponds to the final takeoff speed. 18th Feb 2020, 10:12. Airbus_a321. I hope that makes sense. (The Airbus FMGS safe logic applies to S, F, speeds A Guide to Airbus Green Dot Speed. January 15, 2021. I had activated the approach p It controls pitch to maintain Green Dot Speed (Best Lift to Drag ration speed). Most critical is the Vne, Velocity never exceed. In all cases (all engines operative), the GD speed gives an estimate of the speed for best lift-to-drag ratio. Posts: 2,577 Likes: 25 Received 30 Likes on 17 The green dot speed, in all of its glory (okay, or rather from my past experience) is on its own is not a commanded speed or somekind of a fallback speed (in the Airbus, the managed mode picks a variety of speeds depending on its flight phase, and the green dot is respected, but not always. I'd like to know the procedure for an engine failure happening after v2. Second of a series of articles on the theme of speed control during a flight, which started in issue #18 of this magazine, we have just taken off and are now entering the climb phase. Our understanding (from consultation with experts on the topic) is that in the Single Aisle aircraft, the green dot is indeed not affected by increases in VLS due to speedbrakes. Green Dot (GD) speed Definition GD speed (fig. 82 Mach/340kts in descent and green dot in the climb. At the end you’ll end up at green dot speed (or slightly above ideally) no matter if you go for max. But typical Airbus, have yet to, incredulously considering It's a little bit weird, because on the mother Airbus (A300) the Green Dot speed did change with bank! But there was a known software bug. FCTM and getting to grips with perf. FlightMetrics is your ultimate app for effortlessly calculating aircraft performance metrics, offering seamless analysis, realistic visualization, and user-friendly experience. But in the bus you can switch to FPA mode and set the descent angle directly! case 280knots to 250 knots then another 5 track miles is anticipated for the slowdown from 3000 feet at 250 knots to green dot speed. Note: the calculation of REC MAX does not take into account the use of engine anti-ice. Avrenli University of Illinois at Urbana-Champaign, kaavrenl@syr. -Green Dot + 5 CLEAN UP FROM ENG OUT ACC ALT TO GREEN DOT SPEED ENG Out ACC ALT Push to Level OFF F Speed Call – CONF 1 Call – F SPEED S Speed Call – FLAPS 0 Call – S SPEED Green Dot Speed Select: • OP CLIMB 6 • MCT 7 FINISH ECAM AFTER GREEN DOT SPEED • Continue ECAM Wow. edu Follow this and additional works at: https://commons. 5. It provides an estimate of the speed for best lift-to-drag ratio. Source. For an average 320/321 at mid altitudes and average weights it should be in the region of 275 Knots or so. Old Timer; 2. Represented by a green dot on the PFD scale. Airbus recommends that with an all-engine flameout to fly a speed of 300/. One of the characteristics of the FlightMetrics | Takeoff Performance Calculator [for now only Airbus] is a Microsoft Flight Simulator 2020 mod created by zrxy. It refers to the speed that results in the best climb gradient in case of an engine failure, but it is close the speed resulting in best Green Dot Speed. Ondrej LKMT . Is there any reason why MCDU doesn't let me insert a speed constraint (e. edu Barry J. Climb with 290 kts, then reducing to green dot speed as climb performance reaches near zero. Join Date: Mar 2006. Quote; luu5. edu/jaaer So instead of decelerating to the green dot speed near the FAF, i still start the approach at a high speed of around 240 knots ? thats not realistic. Not Available in the Stable Version; you can instead click on the LSK next to V1, VR and V2 to let the aircraft calculate the V-Speeds for you. erau. The change was in the wrong direction. Improve this - SRS mode after take off (Airbus safety speed mode) - Noise abatement procedure in SRS mode - Manage spped or altitude constraint linked to a waypoint or speed constraint linked to an altitude during a SID - Select Climb thrust/speed until 10000ft (mode ECON, EXPEDITE and N1, Green dot speed) according aircraft gross weight and cost index Initial Calibrated Air Speed (CAS) 250 kts [LT −1] 10 𝑉 Maximum Calibrated Air Speed (CAS) 350 kts [LT −1] 11 Maximum Mach number 0. Learn what is Airbus's "Green Dot Speed", why it's so important and how pilot use Green Dot to improve safety on every flight. – Fixed VLS calculation for IAE engines – Fixed mismatching green dot speed between EFB and aircraft [MSFS] Fenix Simulations – Airbus A320 v2. Do they come up in a turn, banking the aircraft? Thx. Green dot is: The final takeoff speed The target speed in managed mode, when in CONF 0, when the approach phase of the FMS is active The drift down speed, in case of an Tech Log - F , S & green dot speed on A320 - If i fly an A320 at F speed , how can i find the maximum allowable bank at this speed and what will be the margin with Vs ? Same question with S speed and green dot speed Thanks for your help safetyfirst. Posts: 981 Likes: 0 Received 0 Likes on 0 Posts Around green dot speed with the engine on approach idle, the aircraft glide angle matches pretty much the G/S glide path meaning the aircraft maintains its speed unless you increase drag. e. O with flaps 0 the Target Speed is GREEN DOT IF the managed speed target (Magenta Triangle) is below green dot. - Unless in SRS mode, managed speed target cannot be less than green dot/s-speed or f-speed anymore even if there are flight plan constraints requesting less - it's the same in real life. The A321 also got a replacement on its CFM engine variant. It will also make room to fly a green dot speed segment. (i. Thank you. 15G in the process. It shows the speed corresponding to the best lift-to-drag ratio. 6) Weights and fuel (need to investigate more) as the green dot speed and take off calculation were off by a couple of knots. 2% = 19. Green dot speed (minimum gradient) is a function of weight. In One Engine Inoperative (OEI) scenarios, it provides the maximum climb gradient that the aircraft can achieve [2]. The main objective is to manage threats to the airspeed and avoid speed excursions. Airbus A320 speeds and performances calculator. Try “pulling” the speed knob and taking control of the speed bug manually. However, by 2030, all our aircraft and helicopters will be capable of flying with up to 100% SAF. 82 - 12 Cruise Mach number 0. $\endgroup$ It's a little bit weird, because on the mother Airbus (A300) the Green Dot speed did change with bank! But there was a known software bug. With the approach activated the vertical deviation is again useless since it works out a descent at green dot speed, if you're still doing 220 or 240, or whatever, then in open descent you're going down a little bit quicker then at green dot. SET GREEN DOT SPEED: This message is displayed in white when the aircraft is in ENG OUT mode and the FCU SPEED target is ≤ GD -10 or ≥ GD + 10, except in ALT*/ALT. Start with your FMC speed bug is set to 127kts and the auto pilot is managed which is why your throttles are at idle. A. I just finished my first flight in the Toliss A319 and everything worked perfectly until the final approach. Is there a way to have the MCDU calculate the V-speeds on the Laminar A330? I've entered all the route/departure info. How TCAS works The live wind direction and speed data is fed to the FMGC by the ADIRS. When no specific speed limit applies, the default hold speed is approximately equal to:-Green Dot speed on the A318, A319, A320 (CFM) and A321-Green Dot + 20 kt for altitude lower than 20 000 ft, on the A320 (IAE). Since engine thrust decreases with altitude (with air density, actually), so does the rate of climb. The A320 is not very realistic even with the FBW Mod, but fair enough for “Beginners” and already quite sophisticated. As a result, the enroute configuration (end of the third segment) must be achieved within a maximum of 10 minutes after takeoff, thus enabling the Another example of the discrepancy is, of course, Green Dot speed, which is defined on the A320 and A319 as [GW in tonnes x 2] + 85 (knots). , the maximum speed corresponding the next flap lever position. Never have seen this before, but in X plane 12 notice that when you get to DECEL the speed does not go down to green dot and over speeds. 80 - 13 Total length of the trajectory 400 km [L] 14 𝑉𝑧 𝑖 Minimum climb speed 300 ft. * 15 ° when the aircraft speed is below the maneuvering speeds (F, S, or Green Dot speed) -10 kt * Then linear increase to 25 ° up to maneuvering speeds (F, S, or Green Dot speed) -3 kt From an Airbus presentation quoted below: Maneuvering capability. pradz. Greeen Dot (GD) speed is the engine-out operating speed in clean configuration. Share Airbus green dot speed calculator. Set the VR speed to 136. com Airbus A318/A319/A320/A321 (32 bit, FSX/ P3D V3) - Development halted ; MCDU (Left side) Presel. This is one of the most important speeds to understand because I represents a ''safe'' speed for the pilo 1) After T. 000ft, Airbus knows that. So although the plane can safely be flown below the speeds in that config, you may not have adequete protection against stall for all the maneuvers that the plane is certified for. 15 Nov 2021 Nov 15, 2024 · The green dot speed, in all of its glory (okay, or rather from my past experience) is on its own is not a commanded speed or somekind of a fallback speed (in the Airbus, the managed mode picks a variety of speeds depending on its flight phase, and the green dot is respected, but not always. I use the below for the Airbus series, but it does not include the A318: perfcalc. min −1 [LT −1] Is “Green Dot” Always the Optimum Engines-Out Glide Speed on the Airbus A320 Aircraft? When having gusty conditions with max flap speeds close to min managed speed (f, s, green dot) I regularly select a speed below these speeds and allow the speed "fall" below before selecting flaps, this to protect myself from flap over speeds. Skip to search form Skip to main content Skip to account menu. 320 300 280 260 100 145 131 80 60 40 160 SPD SEL 140 120 100 Fpm is approximately 5x ground speed in knots for a 3 degree descent. Then it has a linear increase to 25° up to maneuvering speed -3 kt. Green Dot speeds frame the aircraft climb performance limits. Very smooth and will only pull 0. (Best lift-to-drag ratio speed). The main objective is to retract the slats/flaps at an adequate speed, while sustaining enough lift to accelerate and climb. It appears when the aircraft is below a preselected altitude. This is one of those times. corresponds to the speed that allows the highest climb gradient with one engine inoperative in clean confi gura-tion. 1. gearlever. Lineup 2. A higher ratio means increased fuel efficiency, improved See more Green Dot (GD) speed is a term used by Airbus. Avrenli et al. Link to comment Share on other sites. When the FMGC detects an EO condition, the AP & FD limits bank angles for t/o & app to 15° when the a/c speed < maneuvering speed (F,S or Green Dot speed) –10 kt. This is because the “green dot” speed maximizes the power-off glide range in wings-level flight. Location: In a nice house . Lift Article Third article in the "Control your speed" series started in issue #18 of this magazine, our aircraft is now flying in clean configuration, travelling in cruise. This article aims to highlight how the reference, limit and operating speeds are Download scientific diagram | Continuous Descent Profile (Altitude and Airspeed) Airbus A320-214, EDDT/TXL, (2015-12-21) The Green Dot Speed of the aircraft is assumed to 200 kt CAS, because this GREEN DOT DEFINITION Green dot is an optimized speed. Has anyone come across any good performance calculation utilities (V Speeds, FLEX, etc). Technical / Performance. What I am after is the best rate. For example, "Green Dot" speed for a sharp turn after take-off. Select FLEX and fill in 66 for the temperature. On the speed tape (on the PFD) there are various marking By reducing the speed to green dot I managed to get speed->altitude trade and it looked fine until v/s slowed of course down. 1. A safe logic . The numerical value shown in magenta in the PFD is Vapp and take it as informative. This speed will produce a glide of approximately 100NM from FL400 which equates to a 15:1 glide ratio. Green dot speed can also be manually calculated as below: A) Below 20,000 feet = (2 × weight in tons) + 85. The autothrust then Vx: maximum angle of climb speed: Green Dot Vy: maximum rate of climb speed: speed at Cost Index 0 (ref. Best L/D is at a speed where zero lift (profile) drag equals drag due to lift. ) or 250/275/. 14th Mar 2011, 11:17. I'm not current on airbus anymore, can't remember, but had a discussion lately about green dot and Vls speed with a mate. Another example of the discrepancy is, of course, Green Dot speed, which is defined on the A320 and A319 as [GW in tonnes x 2] + 85 (knots). 3. Check Airman. Figures - uploaded by Robert Schaback Our objective is to highlight the design and operational considerations under-lying all recommendations Airbus has issued to flight crews regarding the monitoring of these speeds during climb. safetyfirst. Regarding the manoeuvring speed limit, different companies often impose higher limits. In this case, you're talking about an Airbus. Maybe something simple? I'm used to Toliss where I simply get the v speed data from ISCS. . Compatible with various aircraft performance data formats, it Tech Log - Calculating GW inflight A320 - during a flight one of my friend showed me a method to calculate the GW from the Green Dot speed by dividing on 85 (constant) or multiplying by 85 I don't actually remember,then they can figure out the Gross Weight, does any one know any reference for that method. Set the V2 speed to 142. g. Green dot speed is displayed on the airspeed scale of the PFD. Green dot speed is displayed inflight, when the FLAPS lever is at 0. Lower GD speed with increasing bank and vice versa. I had my speed in managed mode the entire flight but during my approach it would not slow down. Visit our flyPad Performance Page guide for more information. It seems like 25% of the pilots I talk to don't understand what managed speed the Airbus goes to when you activate approach in the MCDU if clean configuration. The altitude where the aircraft can maintain a vertical speed (climb) of 300 feet per minute at MAX CLB thrust; The aircraft can fly at a speed greater than Green Dot Speed, and lower that VMO/MMO; The maximum The dual-engine failure checklist of the Airbus A320 states that the optimum airspeed at which the aircraft can be flown is the “green dot” speed when an engine restart is considered impossible. To my untrained eye, this looks like it's already handled correctly (ISCS pax, distribution, cargo and fuel datarefs synced), but maybe AirbusFBW/SetWeightAndCG (command) isn't always going through correctly? on the diagram you post it shows that you have to be at 1500ft AGL when entering downwind, and speed should be green dot speed or lower to be confortable. Airbus A32NX and A339X Takeoff Performance Calculator, Calculates Flex temp, Vspeeds, and more! Still In the Airbus you can preprogramm a speed before the actual phase begins, eg in climb you can preset a cruise value and further in. ‐ Green Dot speed on the A318, A319, A320 (CFM) and A321 ‐ Green Dot +20 kt on the A320 (IAE) The sum of aircraft + engine may result in a speed higher than the green dot speed(you lose some fuel from increasing the All Airbus aircraft are capable of flying on a maximum 50% blend of SAF and conventional fuel. Was 80000kg too much at that point? Simbrief did not calculate step-alts for this flight, even with the "correct" $\begingroup$ Hi, unsure what is unclear. (including the obvious 250 knots below 10,000ft). 18th Feb during a flight one of my friend showed me a method to calculate the GW from the Green Dot speed by dividing on 85 (constant) or multiplying by 85 I don't actually remember,then they can figure out the Gross Weight, does any one know any reference for that method. The Greeen As for the previous flight phases, Green Dot, S and F speeds guide the flight crew during descent and approach phases. A CI of 999 should result in an optimum altitude at the crossover altitude (where the maximum speed switches from IAS to Mach), roughly FL260. Location: USA. For example there is a “speed limit” of 250kt below 10. Set THS FOR I’m also not sure what the Airbus definition of max alt is, service or absolute ceiling. The CEO performance calculations I have show an optimum climb speed of 232/. I would suggest this means flying below S speed is OK. The aerodynamic speed. In practice you will select an appropriate speed to expedite and will seldomly make it come back to GD. Some say Green Dot, some say VAPP. speed MCDU A318/319 Presel. 74 at FL383 and a ROC of only 300ft/min at 65t. The stall speed, remains ( to all intents and purposes) the same Ias regardless of altitude. While the green dot speed is the one offering the best fuel rate while holding, it assumes no flap and no slat. luu5. VLS, alpha protection, alpha floor, green dot speed, flap retraction, etc. Twin Otter take-off performance calculations are particularly simple because the take-off configuration (flaps 10°) is the same as the configuration for Vyse (also flaps 10°), and the V2 at MTOW (80 KIAS) is $\begingroup$ When asking this type of question you need to specify the context, ie the aircraft or manufacturer. Engine-out operating speed in clean configuration. " I guess GD speed is min drag on the Airbus airframe plot, but the IAE engine is more fuel efficient at +20kts for some reason. Green Dot is the minimum drag speed and will therefore give you the best angle. 76 This is all theory ofcourse. airbus. alt. Once you are close to the perf approach green dot speed, the speed tape green dot speed will not be that far away and you will be able to SET MANAGED SPEED or CHECK SPEED MODE: This message appears in white when the speed target is selected, but a pre-selected speed has not been set for the next flight phase. A lot to unwrap in that picture. Tas reduces with altitude. On the long range fleet (a330, A340, A350) however, green dot is limited to be at least Green dot and Vls speed on Airbus . Posted December 14, 2020. It is named after the symbol on the speed tape. At 20,000 feet and 60 tons, green dot = (2 x 60) + 85 = 205. About the green dot question: This is different between different Airbus types. Tech Log - A380 Descent calculation - I'm converting to A380 and looking for a rule of thumb for the required distance in DES planning. Is it that the MCDU is still not accurately Fenix Simulations updated their Airbus A320 series with certain improvements. when the aircraft is in clean configuration at green dot speed). once in that particular phase of flight, the only way to go is managed. SAF can be produced using green hydrogen, capturing carbon dioxide, and using renewable electricity to create synthetic fuels. What Happens When Aircraft Run Out Of Fuel? What happens when aircraft run out of fuel? Read survival This article is the conclusion of our theme of speed management during a flight, which began in Safety first Issue #18. When there is a difference of either 30o or 30 knots for the wind data and 5 o C for temperature deviation. Vapp) at FAF? Quote If you wish to fly [] a stabilized approach, insert VAPP as a SPEED CSTR at FAF, in order The dual-engine failure checklist of the Airbus A320 states that the optimum airspeed at which the aircraft can be flown is the “green dot” speed when an engine restart is considered impossible. In the A330/A340 family, this behaviour is different and green dot is always above VLS. It is represented by a green dot on the PFD speed scale and displayed only when the slats / fl aps control Hello, admittedly my only experience is on the 320/321 so apologies if this observation is baseless. At altitudes below 10,000 ft, the “green dot” speed primarily depends on aircraft weight, and typically ranges from 200 to 235 KCAS (knots in calibrated airspeed) for the A320-200 aircraft model (Airbus Industrie, 2002). At V2, one engine out: Stabilized turn at 30°bank before alpha max Page 78 The flight crew uses the PERF CLB page to pre-select a speed. 29th Apr 2010, 12:52. In the standard descent speed Airbus Green Dot crosscheck Some operators, although not the operator in this report, use Airbus’ ‘Less Paper Cockpit (LPC)’ concept, which uses an Electronic Flight Bag (EFB) to compute takeoff performance. Also, most people activate the approach once they start using selected speed, if ATC wants, say 220KTS. The A321 fuselage is 7m longer than the A320, leading to a higher value of profile drag and therefore a higher lift dependent drag for best L/D. After talking with my friend at Airbus he reminded me that "green dot" is the speed that provides the best lift-to-drag ratio when the All Airbus aircraft are capable of flying on a maximum 50% blend of SAF and conventional fuel. -Green Dot + 5 kt for altitude bigger than 20 000 ft, on the A320 (IAE). Green dot is an optimized speed. No need at any time to go selected below I could be wrong, but I believe that, on an airbus, Vx = green dot, Vy = climb at cost index 0. The drift down speed, in case of an engine failure. Below 20 000 ft equal to 2 × weight (tons) +85 Above 20 000 ft, add 1 kt per 1 000 ft The above is from Airbus. GREEN DOT DEFINITION Green dot is an optimized speed. com I think what you are referring to is the best angle of climb speed. Green dot is: The final takeoff speed The target speed in managed mode, when in CONF 0, when the approach phase of the FMS is active The drift down speed, in case of an Jan 26, 2020 · The “green dot” speed is represented by a green dot on the primary flight display of the A320 as shown in Figure 2. Updated Green Dot Speed calculations for the A321neo; Created FacComputer file in our build process for the A321neo; Updated Green Dot speed formulas to resemble A321neo based on data collected from live flights Recalculation and re-work of the speed tables for the A321neo based on official numbers from Airbus; Recalculation and re-work of FlightMetrics | Takeoff Performance Calculator [for now only Airbus] is a Microsoft Flight Simulator 2020 mod created by zrxy. Operations / Technical. angle, max. Our objective is to cover descent from cruise altitude down toward the destination airport and prepare the aircraft for its approach and landing. Furthermore, regions with high magnetic variation will get more accurate wind calculations - О (« GREEN DOT ») : ENGINE OUT OPERATING speed (BEST LIFT TO DRAG RATIO speed or DRIFT DOWN speed) in clean configuration. Flying at green dot speed provides the best climb performance. Green Dot (clean) 210KTS; S speed (Config 1) – 190KTS; F Speed Flap 2 – 150KTS; F Speed Flap 3 – 145KTS; Full Flap – vApp 138KTS; Is “Green Dot” Always the Optimum Engines-Out Glide Speed on the Airbus A320 Aircraft? Kivanc A. 2 glide ratio). 2. Is Green Dot Always the Optimum Engines-Out Glide Speed on the Airbus Look at the performance page: green dot speed times 10 roughly equals the landing distance needed with auto brake low, while the midpoint of F and S speed times 10 roughly equals the distance for auto brake medium. (Green dot (PFD) - correction (1kt per 1000ft above FL200) - 85) / 2 = GW (FAC) Getting to grips with Tech Log - Green Dot Speed - I recently come across the phase "green dot speed" I understand that it is the lowest L/D ratio for the given weight and condition of flight ? correct ? when is it normally used ? Is it similar to Boeing flap up speed or v2 +100 ? Also came across the Airbus perf charts ? what is T ref , T max, Grad 1 and Grad 2 ? How do u use the figures ? Semantic Scholar extracted view of "Is “Green Dot” Always the Optimum Engines-Out Glide Speed on the Airbus A320 Aircraft?" by K. Therefore, we have modelled this correctly: If you are on the glide slope with flaps 1 and somewhere between S-speed and green dot speed you will basically not lose any CAS, as the idle glide ratio is almost the same as the GS slope. 82M -- the optimum relight speed. Top of Descent calculation. The EFB output includes a value for Green Dot speed, which is the speed giving the best lift-to-drag ratio in the clean configuration. Set it up as your selected speed and engage open climb or climb mode (by pulling or pushing the alt knob with your desired altitude), and with ATHR, FD and AP on you should climb with Airbus Green Dot crosscheck Some operators, although not the operator in this report, use Airbus’ ‘Less Paper Cockpit (LPC)’ concept, which uses an Electronic Flight Bag (EFB) to compute takeoff performance. So you can operate in selected speed at 250kt and below green dot in accordance with this technique. Normally speed is 300 kts, subject to CI and ATC Airbus reckon that operating below green dot or a slat/flap speed is ok as long as you consider Vls. However, it is not known whether the “green dot” speed would still That means setting engines to standard climb setting, pitching the nose to maintain best rate of climb speed (speed at which drag is lowest; in Airbus also known as “green dot speed”) and the rate of climb is whatever it is. This type of SAF is sometimes referred to It's a little bit weird, because on the mother Airbus (A300) the Green Dot speed did change with bank! But there was a known software bug. When im aplly NADP 2 for T/O i would like fly green dot speed after im achieve accel. In the FlyByWire A32NX, pilots can calculate takeoff performance data via the flyPad. - 3d model fixes. I was wondering , when I use the MCDU to calculate the v speeds for take off they differ from the speeds that I get if I use the “Wabpro” software sometimes up to 20 K difference. Also, by knowing QNH, it can adjust to those altitude restrictions which are below transition altitude. SAF can be produced using When the FMGC detects an EO condition, the AP & FD limits bank angles for t/o & app to 15° when the a/c speed < maneuvering speed (F,S or Green Dot speed) –10 kt. That is eerily close to the ILS slope of 5. The Airbus A320 ceo should have a service ceiling of FL370 at 78t and ISA, the MSFS A320 doesn’t even reach optimum FL of FL315 for 78t! Second test with weight at 52t, ISA conditions and MCT. Reply. 1) V1: Decision speed VR: Rotation speed V2: Take-off safety speed For every aircraft type, V1, VR and V2 are computed by Airbus on the basis of design speeds and evidence collected The optimal climb in clean configuration is "greendot", represented as a small green circle on your speed scale. Really great plane. It won't go below that until you select flap. Amongst other parameters, the maneuvering speeds Flaps (F), Slats (S) and Green Dot (GD) are a function of the Zero Fuel Weight (ZFW) inserted by the Airbus uses the concept of green dot which is the speed with minimum fuel consumption per time unit in clean configuration. Dempsey University of Illinois at Urbana Champaign, bjdemps@illinois. Select 2 for FLAPS. Your understanding about green dot is right, but according my figures I didn't mean to use the green dot speed from TOD all the way down to landing. hikoushi: 17th Feb 2020 22:17: Quote: Originally Posted by gearlever (Post 10690001) As it does not have radio altimeter reading by then but knows field elevation and QNH, can calculate the 1000ft point. ! 21st Nov 2005, 17:00 #11 Airbus Girl . For a long time I was under the (presumably wrong) impression that the landing speed in an Airbus was the "F-Speed", which I'm aware stands for flap-extension speed for approach, but something I also believed was the correct touchdown IAS. SECURING YOUR TAKE-OFF: UNDERSTANDING SPEEDS ( i . Posts: 2,575 Likes: 25 Received 30 Likes on 17 3. Sometimes other restrictions (altitude/speed) may apply, that is stored in the Navdata and Airbus warns you, if you dont follow them. The document outlines the go-around procedure for pilots, emphasizing safety and best practices in aviation. e. 4k The reason behind is that the speed you see on the PFD is computed by the Flight Augmentation Computers which calculate their own aircraft weights and than compute A Guide to Airbus Green Dot Speed. Airbus green dot speed calculator. We are entering into the descent phase. Beyond that speed you suddenly become a test pilot and your biggest danger is flutter. A320 typical training weights & flap speeds. On Airbus aircraft the Flight Augmentation Computer calculates VS, VLS, Green Dot Speed and the Flap Speeds F & S. ENV Engineering & Technology; Uploaded by mercfan04 Airbus A320 Family Non-Normal Notes Hello everyone. With ATHR ON, speed managed and Approach phase activated the system will target and won't go below the following: green dot At clean configuration, S speed if flaps 1, F speed with flaps 2 and 3, and VAPP when flaps full. 0. Before your airbus simulator preparation session we include useful information in this section of our website. , instead 250 kts, to have best lift to draf ratio. The reason I ask this is because I use the feelThere Airbus A320-series add-on for MS Flight Simulator. Weight Effect. Acceleration for two power settings. So for calculating the TOD Base Knowledge About the Airbus A380 for Flight 1. Learn how aircraft avoid each other using TCAS. Green Dot still doesn’t change with bank angle. F and S: Flaps and Slats minimum retraction speeds Definitions F speed is the minimum speed at The Airbus reference Getting to Grips with Aircraft Performance provides a description in section 4. If you activate approach phase while clean the system will target green dot. One message I took away from the mentioned tutorial on the Boeing aircraft, which I think translates good to the Airbus, is, that as soon as the aircraft Good to know Weights & Speeds. That will command your speed towards Vref. 6. also specified that already accelerating i. 2% (5. speed. speed MCDU A318/319. From this data, instantaneous headwind is computed by the computers and the approach speed on the speed tape is varied. 407 [MSFS] Leonardo Software House – Fly the Maddog X MD–82 On an Airbus aircraft, the Flight Augmentation Computers (FACs) control the rudder and have windshear detection, and the FACs also are responsible for speed computations. TCAS – A Definitive Guide for Pilots. de Performance Calculation for AIRBUS. when the Green Dot is higher than managed speed target with flap 0 -that is not correct, it is a bug. the values will be highlighted. So if you are at 1500ft, this makes 45s after passing abeam the runway threshold. Join Date: May 2002. It is equal to 220 kts at 120t (264500 Ibs) ± 1 kt per ton + 2 kt per 1000 ft above 20000 ft Represented by « О » (green dot) on airspeed Once the page opens, enter the calculated values from the Simbrief Takeoff Performance calculator (the values calculated for your flight might differ because of different weather situations): Set the V1 speed to 136. I am guessing you have passed a circled D on your flight plan. Cost Index 0 however should result in a speed close to green dot at almost the maximum recommended altitude. There, the fuel savings range between 14\% in cruise and 50\% in climb when compared to green dot speed proposed by Airbus. The crew may also check on the PROG page the CRZ FL, MAX REC FL and OPT FL. Likewise, during descent in OEI conditions, the GD speed grants the minimum Green dot, S and F are maneuvering speeds in the selected config. well said, springbok. It is an approximation of the best lift to drag ratio. Airbus A320 Speeds & Performances PRO provides you a professional tool for calculating A320 family speeds and performances including: - Take off speeds: V1, VR and V2 - Flap and slat retraction speeds as well as Green Dot speed - Approach performances including landing distances required For every aircraft type, V1, VR and V2 are computed by Airbus on the basis i cation testing of the airplane. The Airbus safety magazine July 2014 Safety first #18 The Airbus Safety Magazine July 2015 Safety first #20. For base turning, again on the diagram it states to start turning to base after you have elapsed 3s/100ft. 1 Takeoff Flight Path. de facto. 1) is the engine-out operating speed in clean configuration. It corresponds also to the FINAL TAKE OFF speed. The differences between green-dot-speed and EFB-reported speed were fixed as well. In my experience the PFD displayed Green Dot significantly higher than the MCDU, which simply calculates it on the above formula, using the crew-entered ZFW plus the fuel remaining. Tas - True airspeed. B) For every 1000 ft above 20000 = 1 + A. in initial climb stage towards FL 10 000Ft (so we are below 10000) AP already on. This table shows fuel needs for a A330/A340 at 170 tons and 1,500 ft: Fuel flow vs. Lift-to-drag ratio (also know as “L/D”) refers to the amount of lift generated by the aircraft, divided by its drag. You can see in the above tables that the Airbus must Re-worked speed tables based on Airbus documentation; Updated Green Dot Speed calculations for the A321neo Created FacComputer file in our build process for the A321neo Updated Green Dot speed formulas to resemble A321neo based on data collected from live flights Feature(GSX): Automatically start Refuel Process & allow instant refuel with The “CHECK WEIGHT” message on the MCDU of an Airbus A320 indicates a discrepancy Such a significant variance could potentially impact the aircraft’s performance calculations, value on INIT B page is wrong, correct the same. Alpha prot speed does. i tried changing the speeds in the MCDU using the LSK, but same thing happens, the airplane doesnt decelerate, and i still end up at the FAF at high speeds of around 240 knots . 18th Feb 2020, 11:12 #10 Check Airman . Green Dot Speed This green dot appears when the aircraft is flying in the clean configuration. either the predicted landing weight or the current gross weight at transition to the approach phase to compute approach speeds -Green Dot speed on the A318, A319, A320 (CFM) and A321-Green Dot + 20 kt for altitude lower than 20 000 ft, on the A320 (IAE). Comments Off on A Guide to Airbus Green Dot Speed. - Reduced crackling sound on NEO engines, improved whale and external startup sound for the PWG engines The question also cites a passage from an Airbus bulletin, including a reference to the "green dot" airspeed: 1. rate or In reality, in the A320 family, Green dot always stay above VLS with speed brakes retracted, but it does not change if VLS is increased due to speed brake extension. Continuous Descent Profile (Altitude and Airspeed) Airbus A320-214, EDDT/TXL, (2015-12-21) The Green Dot Speed of the aircraft is assumed to 200 kt CAS, because this speed is constant for 5 NM Jan 27, 2021 · The altitude where the aircraft can maintain a vertical speed (climb) of 300 feet per minute at MAX CLB thrust; The aircraft can fly at a speed greater than Green Dot Speed, and lower that VMO/MMO; The maximum altitude the aircraft is certified for. Takeoff Takeoff Roll Monitor Speeds and V-Speeds Active (green): SRS (pitch guidance to maintain V 2 +10) Armed (blue): CLB mode (is next after SRS is done) Airbus Takeoff Performance Calculator is a Microsoft Flight Simulator 2020 mod created by Budzique. If the entered value on INIT B page is correct, disregard VLS, F, S, GREEN DOT speeds on PFD as they are Re-worked speed tables based on Airbus documentation; Updated Green Dot Speed calculations for the A321neo Created FacComputer file in our build process for the A321neo Updated Green Dot speed formulas to resemble A321neo based on data collected from live flights Feature(GSX): Automatically start Refuel Process & allow instant refuel with . (Actual value of the best L/D will of course be lower on Is this correct? the MCDU says 144 but the Airbus has commanded a speed of about 141 Edited December 14, 2020 by keenrw. “Green Dot” (sometimes referenced simply as “GD”) allows the pilots at any time to instantly know what the aircraft’s best lift-to-drag ratio speed is. I was going over 200 knots on a 5 mile final. Higher cost index means you want to fly faster no matter the fuel costs. FlightMetrics is your ultimate app for effortlessly calculating aircraft performance metrics, Hi, The real behaviour is as you describe. com SET MANAGED SPEED or CHECK SPEED MODE: This message appears in white when the speed target is selected, but a pre-selected speed has not been set for the next flight phase. I have noticed that if I keep my airspeed managed and I activate the approach in a flaps zero config the aircraft does not slow to green dot but it slows to vls (or worse, I always correct it before it may have an issue) I do understand the managed speed can Let's define GreenDot speed on the Airbus aircraft. zwzeho tchyw sceu ivw uco ujke aemeq xbs jrs niazj