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SDR ASAA2018020323395

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Service difficulty report · Pressure Switch · Boeing 737990ER

FAA SDR system

Difficulty date
February 3, 2018
Submitted
February 5, 2018
Operation
Air carrier
Aircraft
N440AS
Make and model
Boeing 737990ER
Aircraft serial
41705
Aircraft time
17,023 hours, 5,663 cycles
System (JASC)
4990 · APU Oil System
Part
Pressure Switch
Part number
38762552
Condition
Faulted
Location
Apu Oil
Stage of operation
IN
How discovered
9
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

WHILE ACCOMPLISHING AN APU BITE PROCEDURE IAW FIM 49-60 TASK 801, FOR AIRCRAFT HISTORY OF BLUE MAINTENANCE LIGHT ON WITH OIL LEVEL FOUND FULL, FAULT HISTORY SHOWS NO FAULTS. CURRENT STATUS LAST 17 CYCLES, FAILED TEST, MESSAGE 49-94226 FOR LOW OIL PRESSURE SWITCH, SHOWS OPEN CIRCUIT. ACFT GROUNDED. ACCOMPLISHED FIM 49-90 TASK 805, REMOVED & REPLACED THE LOW OIL PRESSURE SWITCH IAW AMM 49-94-22, LEAK & OPS CHECKED NORMAL. CURRENT STATUS NOW SHOWS NO FAULTS.