SDR DALA2014070803951

Service difficulty report · Controller · Boeing 757251

Difficulty date: July 7, 2014
Submitted: July 8, 2014
Operation: Air carrier
Aircraft: N519US
Make and model: Boeing 757251
Aircraft serial: 23207
Aircraft time: 83,392 hours, 35,941 cycles
System (JASC): 2131 · Cabin Pressure Controller
Part: Controller
Condition: Failed
Location: Cabin Pressure
Stage of operation: DE
How discovered: O
Nature of condition: H
Precautionary procedure: G

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

What was found

AT FL380 LOST BOTH AUTO PRESSURE CONTROLLERS, AN EMERGENCY DESCENT PERFORMED AND MASKS WERE DEPLOYED. BIT CHECKED CABIN PRESSURE CONTROLLERS 1 & 2, BOTH FAULT LOW FLOW. R & R LT PLENUM, REPLACED DRAIN LINE LT PACK, R & R PRESSURIZATION CONTROL PANEL, IAW AMM 21-31 AND 21-51.