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|
Attributes | |
ACN | 1709495 |
Time | |
Date | 201912 |
Place | |
Locale Reference | ZZZ.Airport |
State Reference | US |
Aircraft 1 | |
Make Model Name | B737 Next Generation Undifferentiated |
Operating Under FAR Part | Part 121 |
Flight Phase | Climb |
Flight Plan | IFR |
Person 1 | |
Function | Captain |
Qualification | Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) |
Experience | Flight Crew Last 90 Days 174 Flight Crew Type 1877 |
Events | |
Anomaly | Aircraft Equipment Problem Critical |
Narrative:
During climbout from ZZZ; we had an electrical irregularity resulting in loss of VHF1; yaw damper; four of our six cds display screens; as well as other less important observed failures. During troubleshooting we discovered that a safety pin attached to a piece of luggage had somehow hooked around the standby power circuit breaker (circuit breaker) and pulled it out. We consulted with [maintenance control]; but they could not advise us to reset circuit breaker as this conflicted with flight manual guidance; and that resetting the circuit breaker could only be done using captains emergency authority. After assessing our situation and available options; I decided the safest course of action was to reset the circuit breaker.had we not reset the breaker:we would lose all the electrical system functionality and redundancies that the standby bus provides.we would be down to 2 of 6 cockpit displays (1 was deferred inop prior to flight).we would be down to one VHF radio + ACARS.I only made this decision because I was confident there was no underlying electrical problem; this circuit breaker is not on the list of reset-prohibited cbs; and resetting it was a much safer course of action than simply diverting with multiple degraded systems. To be clear; I would not have reset it if there was any doubt of the reason why it was out. After resetting the circuit breaker; we observed all affected systems return to normal operation.
Original NASA ASRS Text
Title: B737 pilot reported a loss of VHF1; Yaw Damper; four of our six CDS display screens and found it was a CB that was pulled out due to luggage moving it. Pilot reset CB and everything went back on line.
Narrative: During climbout from ZZZ; we had an electrical irregularity resulting in loss of VHF1; Yaw Damper; four of our six CDS display screens; as well as other less important observed failures. During troubleshooting we discovered that a safety pin attached to a piece of luggage had somehow hooked around the Standby Power CB (Circuit Breaker) and pulled it out. We consulted with [Maintenance Control]; but they could not advise us to reset CB as this conflicted with Flight Manual Guidance; and that resetting the CB could only be done using Captains Emergency Authority. After assessing our situation and available options; I decided the safest course of action was to reset the CB.Had we not reset the breaker:We would lose all the electrical system functionality and redundancies that the Standby Bus provides.We would be down to 2 of 6 cockpit displays (1 was deferred inop prior to flight).We would be down to one VHF radio + ACARS.I only made this decision because I was confident there was no underlying electrical problem; this CB is not on the list of reset-prohibited CBs; and resetting it was a much safer course of action than simply diverting with multiple degraded systems. To be clear; I would not have reset it if there was any doubt of the reason why it was out. After resetting the CB; we observed all affected systems return to normal operation.
Data retrieved from NASA's ASRS site 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.