<< >> NASA ASRS Report 625261, July 2004

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.

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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.