|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1801 To 2400|
|Locale Reference||airport : zzz.airport|
|Altitude||agl single value : 0|
|Operator||common carrier : air carrier|
|Make Model Name||B737-700|
|Operating Under FAR Part||Part 121|
|Flight Phase||ground : maintenance|
|Affiliation||company : air carrier|
|Function||other personnel other|
|Affiliation||company : air carrier|
|Function||flight crew : captain|
oversight : pic
|Anomaly||aircraft equipment problem : critical|
other anomaly other
|Independent Detector||other flight crewa|
other flight crewb
|Resolutory Action||none taken : unable|
|Maintenance||contributing factor : engineering procedure|
contributing factor : manuals
|Problem Areas||Flight Crew Human Performance|
Maintenance Human Performance
Chart Or Publication
|Primary Problem||Chart Or Publication|
Captain wrote up a possible lateral control oscillation. Upon conferring with captain, he was asked if he considered this to be a lateral control oscillation event. He stated he didn't know because he had never experienced one before. He did state he wasn't concerned with what he felt in his rudder pedals on climb out. His aft flight attendant was complaining about a vibration in the aft galley floor and walls. No report from anywhere else in cabin. ZZZ maintenance was directed to comply with the maintenance manual inspection and to perform visual inspection of elevators, tabs, seals, wheel well fairing, and wing-to-body fairings. Elevator and tabs were found to be secure and no other defects noted. The modified elevator tabs were installed on jul/thu/02 and free play inspection complied with on jul/sun/02. With captain's words and no defects found, the decision was made that this didn't constitute a lateral control oscillation event. The flight recorder was removed and sent to ZZZ1 as a precaution. The engineering authority/authorized wasn't assigned due to our determination. The aircraft was removed from service the next morning and the engineering authority/authorized complied with and test hop performed with no defects found. There is no policy in place to designate a lateral control oscillation event.
Original NASA ASRS Text
Title: A B737-700 WAS RPTED TO HAVE LATERAL CTL OSCILLATION. MAINT REQUESTS POLICY OR PROC TO DETERMINE WHEN LATERAL CTL OSCILLATION PRESENT.
Narrative: CAPT WROTE UP A POSSIBLE LATERAL CTL OSCILLATION. UPON CONFERRING WITH CAPT, HE WAS ASKED IF HE CONSIDERED THIS TO BE A LATERAL CTL OSCILLATION EVENT. HE STATED HE DIDN'T KNOW BECAUSE HE HAD NEVER EXPERIENCED ONE BEFORE. HE DID STATE HE WASN'T CONCERNED WITH WHAT HE FELT IN HIS RUDDER PEDALS ON CLBOUT. HIS AFT FLT ATTENDANT WAS COMPLAINING ABOUT A VIBRATION IN THE AFT GALLEY FLOOR AND WALLS. NO RPT FROM ANYWHERE ELSE IN CABIN. ZZZ MAINT WAS DIRECTED TO COMPLY WITH THE MAINT MANUAL INSPECTION AND TO PERFORM VISUAL INSPECTION OF ELEVATORS, TABS, SEALS, WHEEL WELL FAIRING, AND WING-TO-BODY FAIRINGS. ELEVATOR AND TABS WERE FOUND TO BE SECURE AND NO OTHER DEFECTS NOTED. THE MODIFIED ELEVATOR TABS WERE INSTALLED ON JUL/THU/02 AND FREE PLAY INSPECTION COMPLIED WITH ON JUL/SUN/02. WITH CAPT'S WORDS AND NO DEFECTS FOUND, THE DECISION WAS MADE THAT THIS DIDN'T CONSTITUTE A LATERAL CTL OSCILLATION EVENT. THE FLT RECORDER WAS REMOVED AND SENT TO ZZZ1 AS A PRECAUTION. THE ENGINEERING AUTH WASN'T ASSIGNED DUE TO OUR DETERMINATION. THE ACFT WAS REMOVED FROM SVC THE NEXT MORNING AND THE ENGINEERING AUTH COMPLIED WITH AND TEST HOP PERFORMED WITH NO DEFECTS FOUND. THERE IS NO POLICY IN PLACE TO DESIGNATE A LATERAL CTL OSCILLATION EVENT.
Data retrieved from NASA's ASRS site as of July 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.