Service difficulty report · Pressure Switch · Boeing 737890

Difficulty date
September 28, 2018
Submitted
October 1, 2018
Operation
Air carrier
Aircraft
N531AS
Make and model
Boeing 737890
Aircraft serial
35199
Aircraft time
32,607 hours, 9,656 cycles
Part
Pressure Switch
Part number
8TJ201NAA1
Part serial
DT8388F
Condition
Failed
Location
Nr 2 Engine
Part time
3,977 hours, 1,155 cycles
Stage of operation
TX
How discovered
O
Nature of condition
N
Precautionary procedure
D

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

What was found

AFTER START NR 2 ENGINE FUEL FILTER BYPASS LIGHT ILLUMINATED. GROUNDED - YES. PERFORMED FIM 73-05 TASK 801. NR 2 ENG BITE TEST SHOWS FAULT CODE 73-31072. THE FUEL FILTER SIGNALS DISAGREE. REMOVED AND REPLACED NR 2 ENG FUEL FILTER DIFFERENTIAL PRESSURE SWITCH REF AMM 73-34-01. OPS CHECK NORMAL