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A line mechanic reports an adapter used to manually rotate the accessory gearbox (agb) internal drive gears was inadvertently left in the agb adapter pad; causing an in-flight shutdown (ifsd) of a cfm-56 engine on a B737-700 aircraft.
| Attributes | |
| ACN | 957425 |
| Time | |
| Date | 201106 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Powerplant Fuel Control Unit |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural FAR Deviation - Procedural Published Material / Policy |
Narrative:
My partner and I removed and installed the hydro-mechanical unit (hmu). While installing the hmu we had a hard time aligning the shaft of the hmu on the engine; so my partner spun the aircraft engine by installing the adapter on the ratchet. We got the hmu on and my partner installed the tubing while I installed the back nut on the back of the hmu. I got done first so I proceeded to install the adapter plate not knowing if he took the adapter out. Lack of communications contributed to this incident.
Original NASA ASRS Text
Title: A Line Mechanic reports an adapter used to manually rotate the Accessory Gearbox (AGB) internal drive gears was inadvertently left in the AGB adapter pad; causing an In-Flight Shutdown (IFSD) of a CFM-56 engine on a B737-700 aircraft.
Narrative: My partner and I removed and installed the Hydro-Mechanical Unit (HMU). While installing the HMU we had a hard time aligning the shaft of the HMU on the engine; so my partner spun the aircraft engine by installing the adapter on the ratchet. We got the HMU on and my partner installed the tubing while I installed the back nut on the back of the HMU. I got done first so I proceeded to install the adapter plate not knowing if he took the adapter out. Lack of communications contributed to this incident.
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.