DH-8B crew found 2 firing pins for the engine fire extinguisher bottles that would not arm. The captain called the air carrier maintenance controller and was told it was acceptable.

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Attributes
ACN	602884
Time
Date	200311
Day	Wed
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : ykm.airport
State Reference	WA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : sfo.tower
Operator	common carrier : air carrier
Make Model Name	Dash 8-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 7700 flight time type : 3000
ASRS Report	602884
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	maintenance problem : non compliance with mel maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far non adherence : company policies
Independent Detector	aircraft equipment other aircraft equipment : firebottle firing pins other flight crewa
Resolutory Action	other
Consequence	other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : repair
Supplementary
Problem Areas	Flight Crew Human Performance Company Aircraft
Primary Problem	Company

Narrative:

During preflight, noticed only 1 out of 2 firing pins would arm on fire extinguisher bottles. Not having system description (only by memory) believed that both firing pins should arm on each engine. Called maintenance. Maintenance control, having system description in front of him, convinced me that I was wrong, and that fire protection system worked properly. I accepted airplane, flew it to seatac. Later in seatac, reviewed system manual at maintenance. It turns out that I was right and maintenance control was wrong. Made proper entry in maintenance logbook. I believe, system description should be in airplanes.

Original NASA ASRS Text

Title: DH-8B CREW FOUND 2 FIRING PINS FOR THE ENG FIRE EXTINGUISHER BOTTLES THAT WOULD NOT ARM. THE CAPT CALLED THE ACR MAINT CTLR AND WAS TOLD IT WAS ACCEPTABLE.

Narrative: DURING PREFLT, NOTICED ONLY 1 OUT OF 2 FIRING PINS WOULD ARM ON FIRE EXTINGUISHER BOTTLES. NOT HAVING SYS DESCRIPTION (ONLY BY MEMORY) BELIEVED THAT BOTH FIRING PINS SHOULD ARM ON EACH ENG. CALLED MAINT. MAINT CTL, HAVING SYS DESCRIPTION IN FRONT OF HIM, CONVINCED ME THAT I WAS WRONG, AND THAT FIRE PROTECTION SYS WORKED PROPERLY. I ACCEPTED AIRPLANE, FLEW IT TO SEATAC. LATER IN SEATAC, REVIEWED SYS MANUAL AT MAINT. IT TURNS OUT THAT I WAS RIGHT AND MAINT CTL WAS WRONG. MADE PROPER ENTRY IN MAINT LOGBOOK. I BELIEVE, SYS DESCRIPTION SHOULD BE IN AIRPLANES.

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.