SDR DL757010199

Service difficulty report · Acm · Boeing 757232

Difficulty date: February 4, 2001
Submitted: February 15, 2001
Operation: Air carrier
Aircraft: N603DL
Make and model: Boeing 757232
Aircraft serial: 22810
Aircraft time: 52,882 hours, 29,397 cycles
System (JASC): 2130 · Cabin Pressure Control System
Part: Acm
Condition: Worn
Location: Lt Pack
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

A/C WILL NOT MAINTAIN HIGHER THAN 7.2 PSID UNTIL RT RECIRC FAN TURNED OFF. WITH RT RECIRC FAN OFF PRESSURIZATION AND TEMP CONTROL WERE NORMAL. AT FL 390 RT PACK OFF LIGHT CAME ON, LATER RT ENG BLEED OFF LIGHT ON. COULD NOT RECOVER RT PK UNTIL ON GROUND AT LAX. THE LEFT PACK OPERATING ALONE WOULD NOT HOLD CABIN PRESSURE UNTIL DESCENDED BELOW FL 220. LEFT PACK WOULD NOT HOLD CABIN PRESSURE AT IDLE THRUST UNTIL BELOW FL 180. REPLACED AIR CYCLE MACHINE.