|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Locale Reference||atc facility : zzz|
|Operator||common carrier : air carrier|
|Make Model Name||Large Transport, Low Wing, 3 Turbojet Eng|
|Flight Phase||climbout : takeoff|
|Affiliation||company : air carrier|
|Function||flight crew : captain|
oversight : pic
|Qualification||pilot : atp|
|Experience||flight time last 90 days : 100|
flight time total : 12000
|Anomaly||other anomaly other|
|Independent Detector||other flight crewa|
|Air Traffic Incident||other|
The recent air carrier accident has caused me to reflect on a problem with the large transport. During a crosswind takeoff for the #2 engine is very susceptible to compressor stalls, especially at the early stage of takeoff roll. While each aircraft (really the engine) varies in its susceptibility to compressor stall during a crosswind takeoff, almost all aircraft exhibit this tendency. The practical result of this problem is that an large transport pilot soon learns to not move the #2 throttle much beyond spool up until 60-80 KTS, if much of a crosswind is present. The net effect of this then is to lengthen the takeoff roll. On a balanced field takeoff a slightly less than V1 abort could easily become a substantial overrun. At least 1 carrier is concerned enough about this problem to program their large transport simulators to mimic a #2 engine compressor stall.
Original NASA ASRS Text
Title: REPORTER EXPRESSES CONCERN ABOUT LGT COMPRESSOR STALL WHEN MAKING A CROSSWIND TKOF.
Narrative: THE RECENT ACR ACCIDENT HAS CAUSED ME TO REFLECT ON A PROB WITH THE LGT. DURING A XWIND TKOF FOR THE #2 ENG IS VERY SUSCEPTIBLE TO COMPRESSOR STALLS, ESPECIALLY AT THE EARLY STAGE OF TKOF ROLL. WHILE EACH ACFT (REALLY THE ENG) VARIES IN ITS SUSCEPTIBILITY TO COMPRESSOR STALL DURING A XWIND TKOF, ALMOST ALL ACFT EXHIBIT THIS TENDENCY. THE PRACTICAL RESULT OF THIS PROB IS THAT AN LGT PLT SOON LEARNS TO NOT MOVE THE #2 THROTTLE MUCH BEYOND SPOOL UP UNTIL 60-80 KTS, IF MUCH OF A XWIND IS PRESENT. THE NET EFFECT OF THIS THEN IS TO LENGTHEN THE TKOF ROLL. ON A BALANCED FIELD TKOF A SLIGHTLY LESS THAN V1 ABORT COULD EASILY BECOME A SUBSTANTIAL OVERRUN. AT LEAST 1 CARRIER IS CONCERNED ENOUGH ABOUT THIS PROB TO PROGRAM THEIR LGT SIMULATORS TO MIMIC A #2 ENG COMPRESSOR STALL.
Data retrieved from NASA's ASRS site as of August 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.