Service difficulty report · Fire Detector · Bombdr BD7001A10

Difficulty date
August 10, 2009
Submitted
October 27, 2009
Operation
General aviation
Aircraft
N613WF
Make and model
Bombdr BD7001A10
Aircraft serial
9128
Part
Fire Detector
Part number
47378401
Part serial
0065
Condition
Failed
Part time
2,274 hours
Stage of operation
IN
How discovered
C
Nature of condition
L
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

CHECK OF THE FIDEEX SYSTEM, CHECKED OUT. ALL OF THE CHECKS PASSED WITH THE EXPECTATION OF THE IN-CIRCUIT CHECK OF THE SQUIB-FIRING-CURRENT. NONE OF THE 3 DUAL-CHANNEL SQUIB OUTPUTS TO THE TWO BOTTLES (12 TOTAL) POPPED THE 1-AMP C/B ON THE TEST-SET. IT WAS VERIFIED THAT THE TEST-SET USED STANDARD CBS. CONNECTING AN IN-CIRCUIT LAMP, IT LIT VERY DIM. THE MEASURED VOLTAGE WAS 18VDC. AN IN LINE CURRENT METER DID NOT SHOW ANY CIRCUIT CURRENT, POSSIBLY DUE TO SUCH A LOW CURRENT AND A HI-INPUT RESISTANCE OF THE METER. IAW THE CMM, THE CURRENT IS SUPPOSE TO BE OVER 4 AMPS. A CONTROLLED TEST WAS PERFORMED USING AN EXTERNAL "TEST-SQUIB" IN A HEAVY 1/2" STEEL BOX. THE TEST-SQUIB WAS WIRED WITH TEST-LEADS INTO ONE OF THE AIRCRAFT SQUIB OUTPUT CONNECTOR’S. PULLED AND TURNED THE FIRE-HANDLE, IT DID NOT FIRE. GROUNDING THE TEST-SQUIB GROUND LEAD DIRECTLY TO THE AIRFRAME DID NOT WORK EITHER. A REPLACEMENT FIDEEX CONTROL BOX (SN 0070) WAS INSTALLED AND THE 1 AMP CB CHECK PASSED ON ALL 12 CHANNELS. (K)