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Two mechanics; were informed a through bolt to secure the outboard flap torque tube to a flap actuator on a crj-900; had not been properly aligned with the splined shaft of a flap actuator.
| Attributes | |
| ACN | 908622 |
| Time | |
| Date | 201009 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Regional Jet 900 (CRJ900) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Flap Control (Trailing & Leading Edge) |
| Person 1 | |
| Function | Inspector |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Person 2 | |
| Function | Technician |
| Qualification | Maintenance Powerplant Maintenance Airframe |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural FAR Deviation - Procedural Published Material / Policy Deviation - Procedural Maintenance |
Narrative:
Performing job card for flap tube lubrication. I; rii'd (required inspection item) the installation of the bolt; that secures the [torque] tube; to the [flap] actuator; right wing; outboard flap. Mr.'X' was the mechanic performing the maintenance. All other flap [torque] tubes went on and were checked for proper installation; except this one. Mechanic 'X' was working on it for some time. The bolt could not be removed; without rotating the tube approximately 1/4 to 1/2 turn. I went into the mdc (maintenance diagnostic computer) and rigged the flap brakes 'off' so the tube could be rotated enough to remove the bolt.the cleaning and greasing took place; and mechanic 'X' was in the process of reinstalling the tube; but could not get the bolt hole; to align. Mechanic 'X' removed the shaft a few times; from the splines of the shafts; checked for proper alignment of the hole; but was unable to get the bolt to go through the shafts. It was suggested; by another inspector; who had just stopped by; to clean the excessive grease; from the [flap] actuator and it's bolt hole. Mechanic 'X' did this; and aligned the shaft; and eventually; got the bolt to go through the hole. I inspected the shaft; put pulling force on shaft; and mechanic 'X' secured the bolt. Not enough force used; and too much grease; possible hydro lock; of some sort. A road trip [was required]; replaced flap torque tube.suggest [being] more forceful; and deliberate; with shaft movement; lateral and torsional.
Original NASA ASRS Text
Title: Two Mechanics; were informed a through bolt to secure the outboard flap torque tube to a flap actuator on a CRJ-900; had not been properly aligned with the splined shaft of a flap actuator.
Narrative: Performing job card for Flap Tube Lubrication. I; RII'd (Required Inspection Item) the installation of the bolt; that secures the [torque] tube; to the [flap] actuator; right wing; outboard flap. Mr.'X' was the Mechanic performing the maintenance. All other flap [torque] tubes went on and were checked for proper installation; except this one. Mechanic 'X' was working on it for some time. The bolt could not be removed; without rotating the tube approximately 1/4 to 1/2 turn. I went into the MDC (Maintenance Diagnostic Computer) and rigged the flap brakes 'off' so the tube could be rotated enough to remove the bolt.The cleaning and greasing took place; and Mechanic 'X' was in the process of reinstalling the tube; but could not get the bolt hole; to align. Mechanic 'X' removed the shaft a few times; from the splines of the shafts; checked for proper alignment of the hole; but was unable to get the bolt to go through the shafts. It was suggested; by another Inspector; who had just stopped by; to clean the excessive grease; from the [flap] actuator and it's bolt hole. Mechanic 'X' did this; and aligned the shaft; and eventually; got the bolt to go through the hole. I inspected the shaft; put pulling force on shaft; and Mechanic 'X' secured the bolt. Not enough force used; and too much grease; possible hydro lock; of some sort. A road trip [was required]; replaced flap torque tube.Suggest [being] more forceful; and deliberate; with shaft movement; lateral and torsional.
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.