Service difficulty report · Pressure Switch · Boeing 737990ER

Difficulty date
January 25, 2019
Submitted
January 29, 2019
Operation
Air carrier
Aircraft
N471AS
Make and model
Boeing 737990ER
Aircraft serial
41703
Aircraft time
17,272 hours, 5,661 cycles
Part
Pressure Switch
Part number
QA07995
Part serial
RZ38388
Condition
Failed
Location
Nr 1 Engine
Part time
8,367 hours, 2,472 cycles
Stage of operation
LD
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

FUEL "FILTER BYPASS" LIGHT ILLUMINATED NR 1 ENGINE ON LANDING ROLLOUT. GROUNDED - YES. COMPLETED FIM 73-05 TASK 801, 73-21071 FAULT CODE SHOWN. REF AMM 73-34-01 FUEL FILTER DIFFERENTIAL PRESSURE SWITCH REMOVED AND REPLACED. PERFORMED FF DPS INSTALLATION TEST NO DEFECTS NOTED OPS CK GOOD. REF AMM 73-21-00 PERFORMED EEC TEST CH A AND B TEST PASSED NO DEFECTS NOTED. OPS CK GOOD, 5 MINUTE IDLE LEAK CHECK GOOD REF AMM 71-00-00 TEST 3A.