SDR IPXA2023051069906

Service difficulty report · Fire Warning · Boeing 74745E

Difficulty date: May 9, 2023
Submitted: May 10, 2023
Operation: Air carrier
Aircraft: N579UP
Make and model: Boeing 74745E
Aircraft serial: 26062
Aircraft time: 114,380 hours, 19,302 cycles
System (JASC): 2612 · Fire Detection
Part: Fire Warning
Part number: 215655
Part serial: BN103722
Condition: False Activation
Stage of operation: TX
How discovered: O
Nature of condition: N
Precautionary procedure: O

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

What was found

INTERMITTENT FWD CARGO FIRE WARNING ANNUNCIATED, AURAL WARNING, AND EICAS MULTIPLE TIMES REF SSM 26-16-01 SHEET4. WITH POWER ON AIRCRAFT, AT DR5227 SOCKETS 3 AND 9 WERE ZERO VOLTS DC. REPLACED DETECTOR A2 LL ZONE 3 FWD. STA 710 LBL 41. REF. MM 26-16-01-401. SYSTEM TESTS GOOD.

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