|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||0601 To 1200|
|Locale Reference||atc facility : zzz|
|Operator||common carrier : air carrier|
|Make Model Name||Medium Large Transport, Low Wing, 2 Turbojet Eng|
|Navigation In Use||Other|
|Flight Phase||cruise other|
|Affiliation||company : air carrier|
|Function||flight crew : first officer|
|Qualification||pilot : atp|
|Experience||flight time last 90 days : 225|
flight time total : 5000
flight time type : 200
|Anomaly||aircraft equipment problem : less severe|
other anomaly other
|Independent Detector||other flight crewa|
|Resolutory Action||none taken : anomaly accepted|
|Air Traffic Incident||other|
Several times now I have flown an medium large transport with the yaw damper MEL'd inoperative. West/O the yaw damper, the aircraft wallows in the landing confign and becomes extremely hard to control if turbulence/wake turbulence is encountered. At altitude 33000' MSL (by choice, we won't go to FL350 or FL370 west/O yaw damper) the aircraft is very unstable in even light turbulence. In moderate turbulence, the aircraft begins to dutch roll. What concerns me is that with no yaw damper and an engine out, I believe it would be almost impossible to control the airplane. In our simulator syllabus, we never performed an engine out approach or V1 cut with the yaw damper inoperative, I have no actual experience in this engine out/no yaw damper confign. I strongly urge some research be done in this area.
Original NASA ASRS Text
Title: PLT COMPLAINT ABOUT MINIMUM EQUIPMENT LIST ALLOWING DISPATCH WITH YAW DAMPER INOPERATIVE.
Narrative: SEVERAL TIMES NOW I HAVE FLOWN AN MLG WITH THE YAW DAMPER MEL'D INOP. W/O THE YAW DAMPER, THE ACFT WALLOWS IN THE LNDG CONFIGN AND BECOMES EXTREMELY HARD TO CTL IF TURB/WAKE TURB IS ENCOUNTERED. AT ALT 33000' MSL (BY CHOICE, WE WON'T GO TO FL350 OR FL370 W/O YAW DAMPER) THE ACFT IS VERY UNSTABLE IN EVEN LIGHT TURB. IN MODERATE TURB, THE ACFT BEGINS TO DUTCH ROLL. WHAT CONCERNS ME IS THAT WITH NO YAW DAMPER AND AN ENG OUT, I BELIEVE IT WOULD BE ALMOST IMPOSSIBLE TO CTL THE AIRPLANE. IN OUR SIMULATOR SYLLABUS, WE NEVER PERFORMED AN ENG OUT APCH OR V1 CUT WITH THE YAW DAMPER INOP, I HAVE NO ACTUAL EXPERIENCE IN THIS ENG OUT/NO YAW DAMPER CONFIGN. I STRONGLY URGE SOME RESEARCH BE DONE IN THIS AREA.
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.