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A line mechanic reports he neglected to properly document the precautionary reseating of the static line to the # 2 air data computer during trouble shooting of a # 2 ADI on a B737-300. The internal plunger; inside the quick disconnect at the static line connection to the air data computer was later found defective and not allowing proper static pressure to the air data computer.
| Attributes | |
| ACN | 857733 |
| Time | |
| Date | 200910 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Air Data Computer |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Experience | Flight Attendant Airline Total 14 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural FAR Deviation - Procedural Published Material / Policy |
Narrative:
Aircraft arrived with a reported avionics problem. While the aircraft was off loading; I first checked and reseated the quick disconnect (qd) lines to the #2 air data computer as a precaution. After further troubleshooting; I discovered the problem was with the #2 ADI and this solved the initial problem. Unknown to me; the plunger on one of the quick disconnect's on the line leading to the #2 air data computer was defective; leading to a problem with the first officer's instruments; after the aircraft departed. Due to the original discrepancy being corrected by the replacement of the #2 ADI; I neglected to properly document the precautionary reseating of the air data computer line due to an oversight. The internal 'plunger' inside the qd on one of the lines leading to the #2 air data computer was later found to be defective; not allowing proper static pressure to be sensed by the air data computer when it was reseated; even though it had been hooked up properly.
Original NASA ASRS Text
Title: A Line Mechanic reports he neglected to properly document the precautionary reseating of the Static line to the # 2 ADC during trouble shooting of a # 2 ADI on a B737-300. The internal plunger; inside the Quick Disconnect at the Static line connection to the ADC was later found defective and not allowing proper Static pressure to the ADC.
Narrative: Aircraft arrived with a reported avionics problem. While the aircraft was off loading; I first checked and reseated the Quick Disconnect (QD) lines to the #2 ADC as a precaution. After further troubleshooting; I discovered the problem was with the #2 ADI and this solved the initial problem. Unknown to me; the plunger on one of the Quick Disconnect's on the line leading to the #2 ADC was defective; leading to a problem with the First Officer's instruments; after the aircraft departed. Due to the original discrepancy being corrected by the replacement of the #2 ADI; I neglected to properly document the precautionary reseating of the ADC line due to an oversight. The internal 'plunger' inside the QD on one of the lines leading to the #2 ADC was later found to be defective; not allowing proper Static pressure to be sensed by the ADC when it was reseated; even though it had been hooked up properly.
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.