SDR DL72L010083

Service difficulty report · Controller · Boeing 727232

Difficulty date: January 17, 2001
Submitted: January 29, 2001
Operation: Air carrier
Aircraft: N512DA
Make and model: Boeing 727232
Aircraft serial: 21314
Aircraft time: 71,405 hours, 47,998 cycles
System (JASC): 2131 · Cabin Pressure Controller
Part: Controller
Condition: Inoperative
Location: A/C Bay
Stage of operation: CL
How discovered: O
Nature of condition: J
Precautionary procedure: A

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

What was found

AT 12000 FT MSL CABIN BEGAN CLIMBING AS PSID INCREASED PAST 3.5 PSID WITH SINGLE PACK. DUCT PRESSURE WAS GOOD AT 34 PSI AT 1.4 EPR. CARGO VALVE CONFIRMED CLOSED. CABIN HAD MAX CLIMB AT 5.5 PSID OF 800 FPM. MAX CABIN ALT 5,500 FT. RETURNED TO CVG. FOUND RT A/C PACK 35 DEG TEMP CONTROLLER AT FAULT. REPLACED CONTROLLER. ALSO REPLACED LEFT PACK COCKPIT TEMP SELECTOR AND RADIO RACK COOLING VALVE. PRESSURIZATION NOW CHECKS NORMAL.