Service difficulty report · Warning Light · Boeing 737990ER

Difficulty date
June 18, 2017
Submitted
June 21, 2017
Operation
Air carrier
Aircraft
N478AS
Make and model
Boeing 737990ER
Aircraft serial
44105
Aircraft time
7,737 hours, 2,588 cycles
Part
Warning Light
Condition
False Activation
Location
Lt Ram Air Door
Stage of operation
CR
How discovered
O
Nature of condition
N
Precautionary procedure
O

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

What was found

LEFT RAM DOOR FULL OPEN ILLUMINATED FOR ENTIRE FLIGHT. ACFT GROUNDED. COULD NOT DUPLICATE MALFUNCTION. PZTC BITE CHECK NORMAL WITH NO FAULTS. VERIFIED BOTH SRADA MOVE SMOOTHLY AND COMPLETELY IN BOTH DIRECTIONS. NO BINDING NOTED. VERIFED BOTH SRADA GO TO CRUISE MODE WITH FLAPS UP & IN AIR MODE. VERIFIED INSTALLATION & PROPER OPERATION OF FAN BYPASS CHECK VALVE. VERIFIED BOTH HEAT EXCHANGERS DROP APPROXIMATELY 100 DEGREES F DURING PACK OPERATION IAW FIM 21-51 TASK 803.