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A B747-200 returned to the field due to unable to retract the right wing landing gear caused by the wing gear sequence valve disconnected during maintenance.
| Attributes | |
| ACN | 416027 |
| Time | |
| Date | 199808 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz |
| State Reference | US |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B747-100 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | climbout : initial other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Qualification | other other : other |
| ASRS Report | 416027 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Qualification | other other : other |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : far non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency none taken : detected after the fact |
| Consequence | Other |
Narrative:
I was working on testing the alternate landing gear extension when I signed off the work in question. As part of this test, we had to disconnect the sequence valve rod from the top of the radius rod of the wing gear wheel well door. After I disconnected the rod, I placed the bolt, spacer and nut on the ledge just below where I was working. When we completed the test, I then put the hardware back through rod and attach point. I never put hardware in end of sequence valve rod until we put it back together at attach point. It is my understanding that after the aircraft returned from takeoff the rod was found unattached with bolt and spacer through rod end only with nut tight.
Original NASA ASRS Text
Title: A B747-200 RETURNED TO THE FIELD DUE TO UNABLE TO RETRACT THE R WING LNDG GEAR CAUSED BY THE WING GEAR SEQUENCE VALVE DISCONNECTED DURING MAINT.
Narrative: I WAS WORKING ON TESTING THE ALTERNATE LNDG GEAR EXTENSION WHEN I SIGNED OFF THE WORK IN QUESTION. AS PART OF THIS TEST, WE HAD TO DISCONNECT THE SEQUENCE VALVE ROD FROM THE TOP OF THE RADIUS ROD OF THE WING GEAR WHEEL WELL DOOR. AFTER I DISCONNECTED THE ROD, I PLACED THE BOLT, SPACER AND NUT ON THE LEDGE JUST BELOW WHERE I WAS WORKING. WHEN WE COMPLETED THE TEST, I THEN PUT THE HARDWARE BACK THROUGH ROD AND ATTACH POINT. I NEVER PUT HARDWARE IN END OF SEQUENCE VALVE ROD UNTIL WE PUT IT BACK TOGETHER AT ATTACH POINT. IT IS MY UNDERSTANDING THAT AFTER THE ACFT RETURNED FROM TKOF THE ROD WAS FOUND UNATTACHED WITH BOLT AND SPACER THROUGH ROD END ONLY WITH NUT TIGHT.
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.