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A B737-300 in climb declared an emergency and diverted due to aircraft required 80 percent of left aileron control yoke to maintain level flight.
| Attributes | |
| ACN | 586644 |
| Time | |
| Date | 200307 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl bound lower : 3500 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time total : 15000 |
| ASRS Report | 586644 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : multi engine pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 200 flight time total : 16214 flight time type : 6641 |
| ASRS Report | 586835 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : diverted to another airport flight crew : declared emergency |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Chart Or Publication Aircraft |
| Primary Problem | Aircraft |
Narrative:
After departure from ZZZ, approximately 3500 ft MSL, hit wake turbulence from a departing B767-300 heavy. Experienced moderate turbulence. After we were out of the turbulence, it took approximately 80 percent of left control wheel deflection to maintain winds level. Continued climb to smooth air. Unable to determine what was wrong. Advised ATC we had a flight control problem, declared an emergency, returned to ZZZ for a normal approach and landing. After gate arrival, found right aileron up about 6-7 inches (right wing down). Maintenance found follow-up cable broken in right main wheel well. Callback conversation with reporter revealed the following information: the reporter stated the aileron problem was countered by the large deflection of the control yoke and only 5 units of rudder trim as it was first thought it was a rudder problem. The reporter said the first officer made a visual check of the right aileron and it was stuck up full deflection. The reporter stated on the ground, maintenance found an aileron cable broken in the right wing 48 inches outboard of the spoiler mixer tower shaft in the main wheel well. The reporter said he still questions why the aileron was deflected to full up and remained in this position on the ground. The reporter stated the airplane still had plenty of control and only used 5 units of rudder trim as it was first suspected a rudder problem.
Original NASA ASRS Text
Title: A B737-300 IN CLB DECLARED AN EMER AND DIVERTED DUE TO ACFT REQUIRED 80 PERCENT OF L AILERON CTL YOKE TO MAINTAIN LEVEL FLT.
Narrative: AFTER DEP FROM ZZZ, APPROX 3500 FT MSL, HIT WAKE TURB FROM A DEPARTING B767-300 HEAVY. EXPERIENCED MODERATE TURB. AFTER WE WERE OUT OF THE TURB, IT TOOK APPROX 80 PERCENT OF LEFT CTL WHEEL DEFLECTION TO MAINTAIN WINDS LEVEL. CONTINUED CLB TO SMOOTH AIR. UNABLE TO DETERMINE WHAT WAS WRONG. ADVISED ATC WE HAD A FLT CTL PROB, DECLARED AN EMER, RETURNED TO ZZZ FOR A NORMAL APCH AND LNDG. AFTER GATE ARR, FOUND R AILERON UP ABOUT 6-7 INCHES (RIGHT WING DOWN). MAINT FOUND FOLLOW-UP CABLE BROKEN IN R MAIN WHEEL WELL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE AILERON PROB WAS COUNTERED BY THE LARGE DEFLECTION OF THE CTL YOKE AND ONLY 5 UNITS OF RUDDER TRIM AS IT WAS FIRST THOUGHT IT WAS A RUDDER PROB. THE RPTR SAID THE FO MADE A VISUAL CHK OF THE R AILERON AND IT WAS STUCK UP FULL DEFLECTION. THE RPTR STATED ON THE GND, MAINT FOUND AN AILERON CABLE BROKEN IN THE R WING 48 INCHES OUTBOARD OF THE SPOILER MIXER TWR SHAFT IN THE MAIN WHEEL WELL. THE RPTR SAID HE STILL QUESTIONS WHY THE AILERON WAS DEFLECTED TO FULL UP AND REMAINED IN THIS POSITION ON THE GND. THE RPTR STATED THE AIRPLANE STILL HAD PLENTY OF CTL AND ONLY USED 5 UNITS OF RUDDER TRIM AS IT WAS FIRST SUSPECTED A RUDDER PROB.
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.