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A mechanic reports he had performed an rii inspection and nose landing gear swing on a B757-200 after a sequence valve change. Aircraft was released for service; but the outbound flight crew had to use the landing gear lever lock override switch to raise the gear lever. The landing gear lever lock circuit breaker was found still pulled with a permanent collar installed.
| Attributes | |
| ACN | 875106 |
| Time | |
| Date | 201001 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Component | |
| Aircraft Component | Gear Lever/Selector |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Experience | Maintenance Technician 25 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy |
Narrative:
Performed rii for nose landing gear sequence valve change on a B757-200 aircraft. On turnover; we were informed that air data computer vmu/mmo switch had been returned to the 'normal' position and that a separate logbook entry had been completed with this information. Had assumed that other than the sequence valve change; along with the operational check and leak check; that the aircraft had been returned to normal configuration. All operational checks and leak checks were normal for the sequence valve change and gear swing. Gear lever lock circuit breaker pulled with a permanent type collar installed. Flight crew had to retract the gear using lock override procedure. Would recommend discouraging the use of permanent circuit breaker collars which could lead to the impression that the circuit breaker is in it's 'normal' position.
Original NASA ASRS Text
Title: A Mechanic reports he had performed an RII Inspection and nose landing gear swing on a B757-200 after a sequence valve change. Aircraft was released for service; but the outbound flight crew had to use the landing gear lever lock override switch to raise the gear lever. The landing gear lever lock circuit breaker was found still pulled with a permanent collar installed.
Narrative: Performed RII for nose landing gear Sequence Valve change on a B757-200 aircraft. On turnover; we were informed that ADC VMU/MMO switch had been returned to the 'Normal' position and that a separate Logbook entry had been completed with this information. Had assumed that other than the Sequence Valve change; along with the Operational Check and Leak Check; that the aircraft had been returned to normal configuration. All Operational checks and Leak checks were normal for the Sequence Valve change and gear swing. Gear Lever Lock circuit breaker pulled with a permanent type collar installed. Flight Crew had to retract the gear using Lock Override procedure. Would recommend discouraging the use of permanent circuit breaker collars which could lead to the impression that the circuit breaker is in it's 'normal' position.
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.