Service difficulty report · Warning System · Boeing 737990ER

Difficulty date
June 28, 2019
Submitted
July 1, 2019
Operation
Air carrier
Aircraft
N493AS
Make and model
Boeing 737990ER
Aircraft serial
41727
Aircraft time
12,635 hours, 4,190 cycles
Part
Warning System
Condition
False Activation
Location
Cockpit
Stage of operation
NR
How discovered
O
Nature of condition
N
Precautionary procedure
K

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

What was found

THE RIGHT RAM DOOR FULL OPEN LIGHT REMAINED ILLUMINATED DURING THE ENTIRE FLIGHT. GROUNDED - YES. PERFORMED FIM 21-51 TASK 803. NO FAULTS ON PACK TEMP CONTROL. VERIFIED NO VISIBLE DEBRIS ON HEAT EXCHANGER ON RH PACK. NO FAULTS FOUND ON EITHER RT SRADA. VERIFIED RT RAM DOOR OPEN LIGHT OPERATES NORMALLY WITH AIRCRAFT IN AIR MODE. VERIFIED RAM AIR DOORS ACTUATE NORMALLY AS WELL. NO FAULTS FOUND IN EITHER LEFT OR RT RAM AIR SYSTEMS. AIRCRAFT RETURNED TO NORMAL CONDITION AND RELEASED. VERIFIED FAN BYPASS CHECK VALVE DOOR IS INSTALLED AND OPERATES NORMALLY AND HEAT EXCHANGERS ARE CLEAN.