SDR ASAA2017072721480

Service difficulty report · A/C Pack · Boeing 737990ER

Difficulty date: July 27, 2017
Submitted: July 31, 2017
Operation: Air carrier
Aircraft: N453AS
Make and model: Boeing 737990ER
Aircraft serial: 36354
Aircraft time: 14,028 hours, 4,612 cycles
System (JASC): 2160 · Cabin Temperature Control System
Part: A/C Pack
Condition: Malfunctioned
Location: Cabin Temp
Stage of operation: NR
How discovered: O
Nature of condition: O
Precautionary procedure: O

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

What was found

AFT CABIN TEMP CONTROL INOPERATIVE. TEMP RUNS FULL COLD THROUGH 50+C IN ALL POSITIONS (OFF, AUTO, MANUAL) TRIM AIR HAS NO EFFECT ON CONTROL. SET TO AVERAGE 10*C FOR PAX. . ACFT GROUNDED. PERFORMED FIM 21-61 TASK 801, CABIN TEMP CONTROL BITE PROCEDURE. FOUND RED LIGHT CAME ON NR 2 INLET. FURTHER PERFORMED FIM 21-62 TASK 852. THIS CLEARS TO RESET PZCT TO GREEN. RUN APU & CHECKED TEMP. ON AFT PAX CABIN HOT TEMP CAME TO NORMAL.