SDR UIEA2020041300729

Service difficulty report · A/C Pack · Boeing 747446

Difficulty date: April 9, 2020
Submitted: April 13, 2020
Operation: Air carrier
Aircraft: N464MC
Make and model: Boeing 747446
Aircraft serial: 26341
Aircraft time: 100,901 hours, 18,909 cycles
System (JASC): 2150 · Cabin Cooling System
Part: A/C Pack
Condition: Malfunctioned
Location: Ac Bay
Stage of operation: CL
How discovered: O
Nature of condition: B, E
Precautionary procedure: H

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

What was found

CLIMBING PAST FL 200, BURNING ODOR WAS SMELLED IN THE FLIGHT DECK ALONG WITH NOISE AND VIBRATION, ALSO REPORTED BY L2 DOOR AND ZONE C. SUSPECTED A PACK AS CAUSE. TURNED OFF PACKS 1 AT A TIME, COINCIDENTALLY RECYCLED PACK 3 AS POWER WAS REDUCED AT LEVEL OFF ALTITUDE. VIBRATIONS STOPPED AND THE BURNING ODOR CLEARED.(<P>TRANSFER TO MDDR 176871 AS PER MEL 21-51-01-01, CAT 'C'. PACK 3 DEACTIVATED. MCC INFORMED. </P>)