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Three avionics technicians; a maintenance specialist; a maintenance analyst; and a maintenance controller report about their involvement with four coax cables robbed (cannibalized) from one B747-400 and installed on another B747-400 aircraft for a TCAS unit with a faulted lower antenna. The TCAS cable configurations were not effective; not interchangeable; between aircraft.
| Attributes | |
| ACN | 994790 |
| Time | |
| Date | 201202 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Traffic Collision Avoidance System (TCAS) |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Avionics Maintenance Powerplant |
| Person 2 | |
| Function | Technician |
| Qualification | Maintenance Avionics |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural FAR Deviation - Procedural Published Material / Policy |
Narrative:
We had aircraft X; a B747-400 with a TCAS lower antenna [write-up]. We found the coax [cable] was bad at the bench plug; so we robbed [cannibalized] the harness from aircraft Y; another B747-400; which was going to ZZZ1 on a ferry flight for a corrosion repair. I was told to install the bad harness from aircraft X onto aircraft Y. I do believe we are not supposed to install a known bad part on an aircraft. I felt that I was under extreme pressure by management to install this bad part.
Original NASA ASRS Text
Title: Three Avionics Technicians; a Maintenance Specialist; a Maintenance Analyst; and a Maintenance Controller report about their involvement with four COAX cables robbed (cannibalized) from one B747-400 and installed on another B747-400 aircraft for a TCAS unit with a faulted lower antenna. The TCAS cable configurations were not Effective; not interchangeable; between aircraft.
Narrative: We had Aircraft X; a B747-400 with a TCAS lower antenna [write-up]. We found the coax [cable] was bad at the bench plug; so we robbed [cannibalized] the harness from Aircraft Y; another B747-400; which was going to ZZZ1 on a ferry flight for a corrosion repair. I was told to install the bad harness from Aircraft X onto Aircraft Y. I do believe we are not supposed to install a known bad part on an aircraft. I felt that I was under extreme pressure by management to install this bad part.
Data retrieved from NASA's ASRS site as of July 2013 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.