airtahitinuiforever 6 Posted February 28, 2021 Share Posted February 28, 2021 having a thrust performance problem with A320/A321 pro IAE engines only. the cfm work well. this has happened with 5 flights in row IAE only. takeoff performance at different airports over the last week KSAN, KPHX, KLAX, KLAS and now KSFO today at 1pm KSFO to KSAN. it had a F79 suggested takeoff performance calculation based off perfromance calculator. at the time KSFO: winds were 320/11 OAT was 60F TOW was 135194 ATC assign me 01R takeoff Perf calcs gave me : Flaps 2 config F79 for temp V1: 149 VR: 150 V2: 156 The plane was off the end of runway almost in water and barely lifted off. i had to pull back at 137kts or else i end up in the drink. the plane was barely climbing and when i hit 800' than speed declined and stall warning occurs. had to manual toga and get up. this has happened 5 times in row A320iae or A321iae models only. has even happened at KPHX where runway is 10,000' long. happened at KLAX KLAS too. Is there a fix for this? why does this happen in IAE only ? need help please . Link to comment Share on other sites More sharing options...
Polo 146 Posted March 1, 2021 Share Posted March 1, 2021 2 hours ago, airtahitinuiforever said: Flaps 2 config F79 for temp Looks like a miscalculation issue: From FCOM IAE Engines limitations: TFLEX cannot be: ‐ Higher than TMAXFLEX, equal to ISA + 55 °C. <----- no more ( 15 + 55 = 70°C ) ‐ Lower than the flat temperature (TREF) ‐ Lower than the actual OAT. and in this RWY and this Weight , for F2 takeoff speeds will be around: v1= 141 Vr= 141 V2= 143 TFLEX= 66 Link to comment Share on other sites More sharing options...
airtahitinuiforever 6 Posted March 1, 2021 Author Share Posted March 1, 2021 ok thanks polo will try again and see. i use the apsoft airplane toolbox for xplane. have created a profile based off aerosoft data. when i inputed: KSFO 01R TOW-135194lbs Clicked the Metar button (metar matched atis and matched ActiveSky) Clicked Calculate it gave me Config 2 F79 @ 1pm today with the above weather temps and winds. I just went to apsoft airplane toolbox no and inputed same info with the correct engines and it gave me now: KSFO 01R TOW-135194lbs Hit metar hit calculated and now it said this: Config 1+ TOGA weird Link to comment Share on other sites More sharing options...
Deputy Sheriffs masterhawk 799 Posted March 1, 2021 Deputy Sheriffs Share Posted March 1, 2021 You can also try this tool: Airbus Takeoff Performance Calculator by Roland Wukovits Link to comment Share on other sites More sharing options...
airtahitinuiforever 6 Posted March 1, 2021 Author Share Posted March 1, 2021 So maybe I spoke too soon . Just took off 3 min ago from KSAN. Same problem . What is goin on here with the IAE models ? This time I took off from Ksan and used different perf calculator. Used the Wabpro online . ksan metar 5-10min ago : 69F winds 355/02 OAT 16c alt 3021. A320iae Tow 140030 lbs runway 27 departure so using wabpro perf calc (last night I used Apsoft airplane toolbox)....it gave me these 2 calcs for 1+ & 2 flaps 1+ config flex 70C v1-145 vr-145 v2-146 flaps 2 config (THIS IS WHAT I USED) flex 70c v1-141 vr-142 v2-146 i reached the end of runway only at 130kts and crashed . How can this happen 6-7 times now even on a runway that’s 10,000 ft like kphx. I’m not suffering from this on CFM model. This is 2 different calculators. The iae model A320/321 struggles to pickup speed . can some1 please help or advise Link to comment Share on other sites More sharing options...
miquelpp 27 Posted March 1, 2021 Share Posted March 1, 2021 I have had this issue for months or maybe for a year (Only IAE engines)., . In fact I don´t fly the A320 buses....but I love the A330. My favourite ac of simulation. Best. Miquel. Link to comment Share on other sites More sharing options...
airtahitinuiforever 6 Posted March 1, 2021 Author Share Posted March 1, 2021 I looked on forum and this has been addressed goin back to 2014. I have not read on any of the forum threads that there is or was a fix. Even when I’m taking off a320A321 IAE ; I look at the speed tape on PFD and it’s barely moving compared to cfm and obvious common sense looking out the window the plane struggling to pickup speed Link to comment Share on other sites More sharing options...
Deputy Sheriffs masterhawk 799 Posted March 1, 2021 Deputy Sheriffs Share Posted March 1, 2021 What are the values suggested by our FMS compared to your's? How does the Aircraft then fly? That are the values for your KSAN departure by the TPC tool. Please login to display this image. Link to comment Share on other sites More sharing options...
airtahitinuiforever 6 Posted March 1, 2021 Author Share Posted March 1, 2021 Wow ! Those numbers are way off compared to apsoft & wabpro . I will try next flight thanks Link to comment Share on other sites More sharing options...
atav757 19 Posted April 9, 2021 Share Posted April 9, 2021 I also use airplane toolbox. It is DEAD wrong with IAE flex trust me. The other day it gave me for a MTOW A321 Flex of 69 on KBOS's 33L... I knew the airplane would overrun the runway. I wish it would be fixed! Link to comment Share on other sites More sharing options...
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