SDR CALA2018032901054

Service difficulty report · Unknown · Boeing 777224

Difficulty date: March 29, 2018
Submitted: March 29, 2018
Operation: Air carrier
Aircraft: N77022
Make and model: Boeing 777224
Aircraft serial: 39777
Aircraft time: 40,087 hours, 3,597 cycles
System (JASC): 2120 · Air Distribution System
Part: Unknown
Condition: Odor
Location: Cabin
Stage of operation: DE
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

STRONG MUSTY ODOR DURING DESCENT WITH THROTTLES AT IDLE. TROUBLESHOT IAW FIM 21-00-00-810-808, CHECKED APU AND BOTH ENGINES FOR OIL LEAKS, FOUND NONE. CHECKED BOTH PACK BAYS FOR LEAKS OR ODOR, FOUND NONE. ALSO CHECKED BOTH RECIRCULATION FAN FILTERS, NO ODORS FOUND. R & R THE RT OZONE CONVERTER IAW AMM 21-73-01-400-801, R & R THE RT LOWER RECIRCULATION FAN FILTER IAW AMM 21-25-07-400-801.