SDR QXEA2020080700233

Service difficulty report · Bleed Air Sys · Bombdr DHC8402

Difficulty date: August 6, 2020
Submitted: August 7, 2020
Operation: Air carrier
Aircraft: N451QX
Make and model: Bombdr DHC8402
Aircraft serial: 4457
Aircraft time: 14,538 hours, 16,001 cycles
System (JASC): 4950 · APU Bleed Air System
Part: Bleed Air Sys
Condition: Smoke
Location: Apu
Stage of operation: TX
How discovered: O
Nature of condition: B
Precautionary procedure: O

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

What was found

LAVATORY SMOKE DETECTOR WENT OFF, CABIN FILLED WITH WHITE SMOKE, APPROXIMATELY TWO MINUTES AFTER, APU BLEED WAS SELECTED. REMOVED FROM SERVICE. DETERMINED SMOKE COMING FROM APU BLEED AIR. PERFORMED AN OPS CHECK OF THE LAV SMOKE DETECTOR IAW AMM TASK 26-12-11-710-801, OPS CHECKED GOOD. INSPECTED APU AND AIR CONDITIONING PACKS, NO OBVIOUS DEFECTS NOTED. RAN BOTH ENGINES AND BOTH PACKS, NO SMOKE OBSERVED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.