SDR ASAA2020080422981

Service difficulty report · Indication Sys · Boeing 737990ER

Difficulty date: August 2, 2020
Submitted: August 4, 2020
Operation: Air carrier
Aircraft: N402AS
Make and model: Boeing 737990ER
Aircraft serial: 41189
Aircraft time: 29,051 hours, 9,409 cycles
System (JASC): 3100 · Indicating/Recording System
Part: Indication Sys
Condition: Malfunctioned
Stage of operation: AP
How discovered: 9
Nature of condition: G
Precautionary procedure: O

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

What was found

WITH BOTH F/D SWITCHES ON, COMMAND BARS ON FO PFD DISAPEARED WHEN APP MODE BECOME ACTIVE AT GLIDESLOPE INTERCEPT. RECYCLED F/D SWITCHES AND LOC ON GS ENGAGED ON CAPT SIDE BUT NOT ON FO SIDE. GROUNDED - YES. ACCOMPLISHED DFCS FLIGHT FAULT REVIEW, GROUP BITE 12, FLT DIREC, ALL TEST PASSED. ACCOMPLISHED LAND VERIFY TEST, GROUP BITE 49, ALL TEST PASSED IAW AMM 22-11-00-740-806.