SDR AALA2020022099021

Service difficulty report · Indicator · Boeing 737823

Difficulty date: February 18, 2020
Submitted: February 20, 2020
Operation: Air carrier
Aircraft: N862NN
Make and model: Boeing 737823
Aircraft serial: 30905
Aircraft time: 29,279 hours, 11,948 cycles
System (JASC): 2132 · Cabin Pressure Indicator
Part: Indicator
Condition: Malfunctioned
Location: Cabin Pressure
Stage of operation: CR
How discovered: O
Nature of condition: N
Precautionary procedure: B

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

What was found

AIRCRAFT WAS GROUNDED: AT FL370 CABIN DIFFERENTIAL PRESSURE WAS NORMAL. AT FL 380 IT WENT TO 8.65-8.70 (8.35NORMAL). AT FL380 CABIN PRESSURE WAS 6500-7000FEET. DESCENDED TO FL360 AND DIFFERENTIAL STAYED HIGH (8.4-8.5) UNTIL WE DESCENDED THROUGH ABOUT FL 300. ACCOMPLISHED BOTH DCPC BITE CHECK. IAW AMM #21-31-00. NO FAULTS NOTED. REMOVED AND REPLACED CABIN ALTITUDE AND DIFFERENTIAL PRESSURE INDICATOR IAW AMM #21-33-02.