Service difficulty report · Pressure Switch · Boeing 737990ER

Difficulty date
April 3, 2023
Submitted
April 5, 2023
Operation
Air carrier
Aircraft
N474AS
Make and model
Boeing 737990ER
Aircraft serial
40715
Aircraft time
28,891 hours, 9,066 cycles
Part
Pressure Switch
Part number
QA07995
Part serial
RF53183
Condition
Unknown
Location
#1 Engine
Part time
11,921 hours, 3,570 cycles
Stage of operation
TX
How discovered
V
Nature of condition
J
Precautionary procedure
K

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

What was found

AFTER TAXIING CLEAR OF THE RUNWAY, THE FILTER BYPASS ON THE #1 ENGINE OF THE FUEL PANEL LIGHT CAME ON. WE SHUT DOWN THE ENGINE AND TAXIIED IN NORMALLY. GROUNDED - YES. RUN ENGINE REF. AMM 71-00-00 & FILTER BYPASS LIGHT DID NOT CAME ON. FOUND MX MESSAGE 73-31071 REF. FIM 73-00 TASK 801. O/H FILTER BYPASS ON @ #1 ENGINE. JP 69016 04/04/2023. REMOVED & REPLACED FFDPS REF. AMM 73-34-01/401.PERFORMED GOOD EEC TEST FOR #1 ENGINE BYPASS FUEL SWITCH, REF. AMM 73-21-00-700-804-F00. N. KENENO 42609 04/04/2023. PERFORM LEAK CHECK ON #1 ENGINE FFDPS, NO LEAKS NOTED. A/C OK FOR SERVICE.