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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An MD80 on climb at 15000 ft declared an emergency due to yoke binding when passing center position. Increased speed increased yoke binding. Crew returned to departure airport.
| Attributes | |
| ACN | 686424 |
| Time | |
| Date | 200602 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 15000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : initial |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 210 flight time type : 10000 |
| ASRS Report | 686424 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | aircraft equipment other aircraft equipment : aileron ctl yoke other flight crewa other flight crewb |
| Resolutory Action | flight crew : declared emergency other |
| Consequence | other |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft Environmental Factor |
| Primary Problem | Aircraft |
Narrative:
On climb out; I noticed the yoke would bind up when turning past the center position as I was speeding up (faster than 250 KTS). I talked with maintenance control and dispatch and returned to land. I declared an emergency and made a slow turn for ZZZ. I was able to follow a 3 to 1 profile into ZZZ with only 2 180 degree turns for runway 16L. (We used runway 16L for the length.) we were 9500 pounds overweight when we landed. Touchdown was at 100 ft per min. We had no further problems with the yoke binding when we slowed below 250 KTS. I don't understand why the increase in speed made the yoke bind.callback conversation with reporter revealed the following information: the reporter said the binding was felt on the captain's yoke and the first officer's when passing through the center position. The reporter still can't explain why the binding increased as the speed increased. The reporter followed up to obtain the maintenance action taken and discovered the problem was on the ailerons and aileron tab hinges; adding; lubrication of the ailerons and aileron tab hinges plus retorqing of the aileron tab hinges corrected the problem.
Original NASA ASRS Text
Title: AN MD80 ON CLB AT 15000 FT DECLARED AN EMER DUE TO YOKE BINDING WHEN PASSING CENTER POSITION. INCREASED SPD INCREASED YOKE BINDING. CREW RETURNED TO DEP ARPT.
Narrative: ON CLB OUT; I NOTICED THE YOKE WOULD BIND UP WHEN TURNING PAST THE CENTER POSITION AS I WAS SPDING UP (FASTER THAN 250 KTS). I TALKED WITH MAINT CTL AND DISPATCH AND RETURNED TO LAND. I DECLARED AN EMER AND MADE A SLOW TURN FOR ZZZ. I WAS ABLE TO FOLLOW A 3 TO 1 PROFILE INTO ZZZ WITH ONLY 2 180 DEG TURNS FOR RWY 16L. (WE USED RWY 16L FOR THE LENGTH.) WE WERE 9500 LBS OVERWT WHEN WE LANDED. TOUCHDOWN WAS AT 100 FT PER MIN. WE HAD NO FURTHER PROBLEMS WITH THE YOKE BINDING WHEN WE SLOWED BELOW 250 KTS. I DON'T UNDERSTAND WHY THE INCREASE IN SPD MADE THE YOKE BIND.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID THE BINDING WAS FELT ON THE CAPT'S YOKE AND THE FO'S WHEN PASSING THROUGH THE CENTER POSITION. THE RPTR STILL CAN'T EXPLAIN WHY THE BINDING INCREASED AS THE SPD INCREASED. THE RPTR FOLLOWED UP TO OBTAIN THE MAINT ACTION TAKEN AND DISCOVERED THE PROBLEM WAS ON THE AILERONS AND AILERON TAB HINGES; ADDING; LUBRICATION OF THE AILERONS AND AILERON TAB HINGES PLUS RETORQING OF THE AILERON TAB HINGES CORRECTED THE PROBLEM.
Data retrieved from NASA's ASRS site as of January 2009 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.