SDR ASAA2018072525527

Service difficulty report · Unknown · Boeing 737890

Difficulty date: July 25, 2018
Submitted: July 26, 2018
Operation: Air carrier
Aircraft: N529AS
Make and model: Boeing 737890
Aircraft serial: 35198
Aircraft time: 32,468 hours, 9,773 cycles
System (JASC): 2130 · Cabin Pressure Control System
Part: Unknown
Condition: Malfunctioned
Location: Cabin Pressure
Stage of operation: CL
How discovered: O
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

HUGE SPIKE IN CABIN RATE OF CLIMB OVER 1100 FPM NEAR TOP OF CLIMB FL360. RATE FLUCTUATION +/- 500 FPM AT TOP OF DESCENT. GROUNDED - YES. PERFORMED FIM 21-31 TASK 801, NO FAULTS, TASK 818, NO FAULTS, AND FIM 21-33 TASK 802, NO FAULTS. NO FAIL LIGHTS.