SDR AALA2019021549002

Service difficulty report · Acm · Boeing 767323

Difficulty date: February 13, 2019
Submitted: April 3, 2019
Operation: Air carrier
Aircraft: N379AA
Make and model: Boeing 767323
Aircraft serial: 25448
Aircraft time: 102,694 hours, 16,692 cycles
System (JASC): 2130 · Cabin Pressure Control System
Part: Acm
Condition: Defective
Location: Right
Stage of operation: NR
How discovered: V
Nature of condition: O
Precautionary procedure: K

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

What was found

FLIGHT EXPERIENCED A RIGHT PACK OVERHEAT, RESULTING IN A LOSS OF CABIN PRESSURE. CABIN PRESSURE UNABLE TO HOLD AT CRUISE ALTITUDE ON ONE PACK SLOW LOSS OF PRESSURE TO CABIN ALTITUDE 12,000. MASKS DID NOT DEPLOY, EMERGENCY DECLARED, AND FLIGHT LANDED WITHOUT FURTHER INCIDENT. THE AIRCRAFT WAS GROUNDED. REMOVED AND REPLACED RT PACK LOW LIMIT VALVE IAW AMM 21-51-11. FIELD REPORTS THE RT ACM IS AT FAULT. REPLACED RT ACM IAW AMM 21-51-03.