TM 55-1520-240-T
4-12.3 FULL AUTHORITY DIGITAL ELECTRONIC CONTROL (FADEC) VISUAL CHECK (Continued)
4-12.3
TASK
RESULT
6.
Check P3 line (14) from DECUs (12 and 13) to engine
If any part of P3 line (14) is loose, kinked or damaged,
No. 1 and No. 2 disconnect shelves.
tighten or replace it as required.
7.
Check POWER ASSURANCE TEST 1/OFF/2 switch
If switch is loose or damaged, tighten or replace it as
(15).
required.
CHECK ENGINE NO. 1
8.
Check inlet air temp T1 sensor (16).
If sensor (16) is loose or damaged, tighten or replace it. If
connector to sensor (16) is loose or damaged, tighten plug
or replace wire harness (TM 1-2840-265-23).
9.
Check wire harness connection (17).
If harness plug is loose or damaged, tighten or replace
harness (TM 1-2840-265-23). If receptacle is damaged,
replace harness (TM 1-2840-265-23).
10.
Check start fuel valve (18).
If start fuel valve is loose or damaged, tighten or replace
valve. If connector to valve is loose or damaged, tighten
plug or replace harness (TM 1-2840-265-23).
11.
Check HMU connector (19).
If HMU connector (19) is loose or damaged, tighten plug
or replace harness (TM 1-2840-265-23).
12.
Check HMU alternator connector (20).
If HMU alternator connector (20) is loose or damaged,
tighten plug or replace harness (TM 1-2840-265-23).
13.
Check reversionary stepper motor connector (21).
If connector (21) is loose or damaged, tighten plug or
replace harness (TM 1-2840-265-23).
14.
Check engine harness connector (22).
If engine harness connector (22) is loose or damaged,
tighten plug or replace harness (TM 1-2840-265-23).
15.
Check P3 line (23).
If P3 line (23) is loose, kinked or damaged, tighten
connection or replace line.
16.
Check engine harness connector (24).
If engine harness connector (24) is loose or damaged,
tighten plug or replace harness.
17.
Check N2 sensor (25).
If sensor (25) is loose or damaged, tighten or replace it. If
either connector to sensor is loose or damaged, tighten
plug or replace harness.
18.
Check torque sensor junction box (26).
If junction box (26) is loose or damaged, tighten or replace
it. If connector to junction box is loose or damaged,
tighten plug or replace harness (TM 1-2840-265-23).
19.
Check overspeed valve (27).
If valve (27) is loose or damaged, tighten or replace it. If
connector to valve is loose or damaged, tighten plug or
replace harness (TM 1-2840-265-23).
CHECK ENGINE NO. 2
20.
Perform steps 8 thru 19 on engine no. 2.
FOLLOW-ON MAINTENANCE:
Controls closet acoustic blanket installed.
Controls closet panel closed.
Engine work platforms closed.
Engine access covers closed.
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Change 17 4-265
