SDR ASAA2013120596639

Service difficulty report · Module · Boeing 737990ER

Difficulty date: December 5, 2013
Submitted: December 9, 2013
Operation: Air carrier
Aircraft: N431AS
Make and model: Boeing 737990ER
Aircraft serial: 43255
Aircraft time: 491 hours, 168 cycles
System (JASC): 3460 · Flight Management Computing Hardware System
Part: Module
Condition: Malfunctioned
Location: Display
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

DIGITAL DISPLAYS, BOTH LAND ALT WINDOW AND CRUISE ALT WINDOW, ON CABIN PRESSURE CONTROLLER BLINK ON/OFF CONSTANTLY, ALSO WILL NOT DIM. ACFT GROUNDED. REMOVED P5-6 CABIN PRESSURE CONTROL MODULE REF TASK 21-31-02-000-801 AND INSPECTED ELECTRICAL CONNECTIONS. ALL OK. REINSTALLED P5-6 CABIN PRESSURE CONTROL MODULE REF TASK 21-31-02-400-801 AND RESET C/BS. MODULE LIGHTING DISPLAY NOW OPS NORMAL. SUSPECT FAULTY CONTACT/CONNECTION REPAIRED DURING REMOVAL AND REPLACEMENT PROCESS.