Service difficulty report · Control Module · Boeing 737990ER

Difficulty date
September 21, 2018
Submitted
September 24, 2018
Operation
Air carrier
Aircraft
N423AS
Make and model
Boeing 737990ER
Aircraft serial
35206
Aircraft time
21,687 hours, 7,167 cycles
Part
Control Module
Part number
71231997303AB
Part serial
99032859
Condition
Defective
Location
Cockpit
Part time
10 hours, 2 cycles
Stage of operation
NR
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

CABIN PRESSURE PANEL LIGHTS PULSE IT IS WORST IN DIM SETTING. GROUNDED - YES. REMOVED AND REPLACED CABIN PRESSURE CONTROL SELECTOR MODULE REF AMM 21-31-02. CABIN PRESSURIZATION OPERATIONAL GROUND TEST AND MANUAL MODE TEST CHECKED NORMAL REF AMM 21-31-00.