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A B737-300 first officer denies neither he nor the captain pulled the standby altimeter circuit breaker that was discovered after arrival.
| Attributes | |
| ACN | 625261 |
| Time | |
| Date | 200407 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | tower : mdw.tower |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 70 flight time total : 21000 flight time type : 2000 |
| ASRS Report | 625261 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 230 flight time total : 11500 flight time type : 5400 |
| ASRS Report | 625364 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : company policies |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Aircraft Maintenance Human Performance Flight Crew Human Performance |
| Primary Problem | Ambiguous |
Narrative:
I received notification that the standby altimeter circuit breaker was found out after our leaving the aircraft. Under no circumstances do I pull that or condone anyone pulling that circuit breaker. The captain, I was flying with, is extremely careful to follow SOP, so I know he did not pull it. Prior to our arrival at ZZZ airport we even discussed the recent e-note about doing preflight exactly by SOP. I have no idea who was in the cockpit after our arrival, but I can state either someone else pulled it or it popped on its own, as circuit breakers sometimes do. That is their design. It is my belief that company SOP of pulling yellow circuit breakers every night makes them predisposed to this. I have noticed yellow collared circuit breakers popping or needing to be recycled with maintenance concurrence more than non collared circuit breakers.
Original NASA ASRS Text
Title: A B737-300 FO DENIES NEITHER HE NOR THE CAPT PULLED THE STANDBY ALTIMETER CIRCUIT BREAKER THAT WAS DISCOVERED AFTER ARR.
Narrative: I RECEIVED NOTIFICATION THAT THE STANDBY ALTIMETER CIRCUIT BREAKER WAS FOUND OUT AFTER OUR LEAVING THE ACFT. UNDER NO CIRCUMSTANCES DO I PULL THAT OR CONDONE ANYONE PULLING THAT CIRCUIT BREAKER. THE CAPT, I WAS FLYING WITH, IS EXTREMELY CAREFUL TO FOLLOW SOP, SO I KNOW HE DID NOT PULL IT. PRIOR TO OUR ARR AT ZZZ ARPT WE EVEN DISCUSSED THE RECENT E-NOTE ABOUT DOING PREFLT EXACTLY BY SOP. I HAVE NO IDEA WHO WAS IN THE COCKPIT AFTER OUR ARR, BUT I CAN STATE EITHER SOMEONE ELSE PULLED IT OR IT POPPED ON ITS OWN, AS CIRCUIT BREAKERS SOMETIMES DO. THAT IS THEIR DESIGN. IT IS MY BELIEF THAT COMPANY SOP OF PULLING YELLOW CIRCUIT BREAKERS EVERY NIGHT MAKES THEM PREDISPOSED TO THIS. I HAVE NOTICED YELLOW COLLARED CIRCUIT BREAKERS POPPING OR NEEDING TO BE RECYCLED WITH MAINT CONCURRENCE MORE THAN NON COLLARED CIRCUIT BREAKERS.
Data retrieved from NASA's ASRS site as of July 2007 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.