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Mechanic describes his involvement with troubleshooting an existing MEL on a #1 engine fire warning 'B' loop and also finding chafed wire insulation on the 'a' loop of the same B737-500. He deferred the 'a' loop. But aircraft was later grounded.
| Attributes | |
| ACN | 821620 |
| Time | |
| Date | 200901 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B737-500 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Powerplant Fire/Overheat Warning |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Experience | Maintenance Avionics 4 Maintenance Technician 6 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural FAR Deviation - Procedural Published Material / Policy |
Narrative:
On the evening of jan/xa/09 into jan/xb/09 I was working on aircraft. It had an MEL on #1 engine B loop. Troubleshot the problem to be a broken wire W1508-006-16R between D1208 and M1122 reference wiring diagram manual 26-11-11. While troubleshooting; also noticed that a loop wire W1508-005-16R was chafed on the outer insulation only. It was operable and within limits. I relayed the information to my lead and supervisor. Supervisor told me he'd discuss it at the supervisor's meeting. The aircraft wasn't leaving till the afternoon; so I requested hangar space. After their meeting; my supervisor told me we were going to defer it and wiring diagram manual granted to my lead and supervisor then passed on to me. Since B loop was on MEL and a loop was operable; they got a deferral from maintenance control. Next day I was told the aircraft was grounded. I don't feel a change is necessary. I feel like I followed the proper documents and chain of command.
Original NASA ASRS Text
Title: Mechanic describes his involvement with troubleshooting an existing MEL on a #1 engine Fire warning 'B' loop and also finding chafed wire insulation on the 'A' loop of the same B737-500. He deferred the 'A' loop. But aircraft was later grounded.
Narrative: On the evening of Jan/XA/09 into Jan/XB/09 I was working on aircraft. It had an MEL on #1 engine B loop. Troubleshot the problem to be a broken wire W1508-006-16R between D1208 and M1122 reference Wiring Diagram Manual 26-11-11. While troubleshooting; also noticed that A loop wire W1508-005-16R was chafed on the outer insulation only. It was operable and within limits. I relayed the information to my Lead and Supervisor. Supervisor told me he'd discuss it at the Supervisor's meeting. The aircraft wasn't leaving till the afternoon; so I requested hangar space. After their meeting; my Supervisor told me we were going to defer it and Wiring Diagram Manual granted to my Lead and Supervisor then passed on to me. Since B loop was on MEL and A loop was operable; they got a deferral from Maintenance Control. Next day I was told the aircraft was grounded. I don't feel a change is necessary. I feel like I followed the proper documents and chain of command.
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.