SDR AALA2019010228003

Service difficulty report · A/C Pack · Boeing 767323

Difficulty date: December 27, 2018
Submitted: January 2, 2019
Operation: Air carrier
Aircraft: N379AA
Make and model: Boeing 767323
Aircraft serial: 25448
Aircraft time: 102,356 hours, 16,621 cycles
System (JASC): 2150 · Cabin Cooling System
Part: A/C Pack
Condition: Faulted
Location: Right
Stage of operation: CR
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

DURING CRUISE, FLIGHT FL 390, LOWER EICAS MESSAGE FOR THE RIGHT PACK TEMPERATURE, AND RIGHT PACK INOPERATIVE, DISPLAYED THE FOLLOWING QRH GUIDANCE BEFORE RESET COULD BE ATTEMPTED. CABIN ALTITUDE MASTER WARNING RECEIVED WITH LEFT PACK STILL OPERATING. MAINTENANCE ACCOMPLISHED ATBT & TII, LEFT HEAT EXCHANGER IAW AMM 21-51-02, AND REPLACED THE RIGHT PACK OVERHEAT SENSOR 5-49 IAW AMM 21-51-18, AND PERFORMED SATISFACTORY OPERATIONAL CHECK.