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Three mechanics report their involvement with the rigging of the left and right flap trailing edges after replacement of #1;2;4;5;7 and #8 flap transmissions. During the flap operational check; damage occurred to the #2 engine aft upper pylon fairing; directly aft of the #6 flap transmission. A torque tube (T/T) had not been reconnected on the inboard side of #6 transmission.
| Attributes | |
| ACN | 908722 |
| Time | |
| Date | 201009 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Dawn |
| Aircraft 1 | |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Flap/Slat Control System |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Powerplant Maintenance Airframe |
| Person 2 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy |
Narrative:
#1; 2; 4; 5; 7; and 8 transmissions were changed for time. Work was bought off by inspector and ok'd for operational check and rigging. Flaps were run up and down a couple times then brought up to rig the flaps. Number six [flap] transmission inboard torque tube (T/T) was disconnected; as well as both torque tubes on #7 and the right hand side in the wheel well. Number six transmission was rigged then we proceeded to rig #7 and #8 transmission. Once all four transmissions were rigged properly; the torque tubes were reconnected and mechanic 'Z' and I went up to the cockpit to drop flaps. Mechanic 'Y' stayed down to clear. We brought flaps down electronically due to it being slower. They were down to about '1' or a little past when mechanic 'Y' told us we had a problem. We shut everything down and came down and realized #6 transmission inboard torque tube had not been reconnected. The flap had kicked over to the side and damaged the aft upper pylon fairing.
Original NASA ASRS Text
Title: Three mechanics report their involvement with the rigging of the left and right flap trailing edges after replacement of #1;2;4;5;7 and #8 flap transmissions. During the flap operational check; damage occurred to the #2 engine aft upper pylon fairing; directly aft of the #6 flap transmission. A torque tube (T/T) had not been reconnected on the inboard side of #6 transmission.
Narrative: #1; 2; 4; 5; 7; and 8 transmissions were changed for time. Work was bought off by Inspector and OK'd for Operational Check and rigging. Flaps were run up and down a couple times then brought up to rig the flaps. Number six [Flap] transmission inboard torque tube (T/T) was disconnected; as well as both torque tubes on #7 and the right hand side in the wheel well. Number six transmission was rigged then we proceeded to rig #7 and #8 transmission. Once all four transmissions were rigged properly; the torque tubes were reconnected and Mechanic 'Z' and I went up to the cockpit to drop flaps. Mechanic 'Y' stayed down to clear. We brought flaps down electronically due to it being slower. They were down to about '1' or a little past when Mechanic 'Y' told us we had a problem. We shut everything down and came down and realized #6 transmission inboard torque tube had not been reconnected. The flap had kicked over to the side and damaged the aft upper pylon fairing.
Data retrieved from NASA's ASRS site as of April 2012 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.