Service difficulty report · Warning System · Boeing 737990ER

Difficulty date
March 16, 2019
Submitted
March 20, 2019
Operation
Air carrier
Aircraft
N472AS
Make and model
Boeing 737990ER
Aircraft serial
60580
Aircraft time
15,650 hours, 5,113 cycles
Part
Warning System
Condition
False Activation
Location
Cockpit
Stage of operation
NR
How discovered
O
Nature of condition
N
Precautionary procedure
O

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

What was found

CONT CAB ZONE TEMP WHEN PRESSING MASTER RECALL. RESETS WITH MASTER CAUTION. GROUNDED - YES. ACCOMPLISHED PACK/ZONE TEMP CONTROL BITE, FLIGHT DECK TRIM VALVE ILLUMINATED ON NR 2 PZTC (M1443) DURING BIT AND PREVIOUS FLT, GREEN GO LIGHT ILLUMINATED DURING VERIFY PHASE OF BITE. REF FIM 21-62 TASK 801. ACCOMPLISHED INITIAL EVALUATION STEP E. (1)(A). NO FURTHER ACTION NECESSARY, REF FIM 21-62 TASK 832.