TM55-2840-251-23
Section X ENGINE TESTING (Continued)
1-95
GROUND TESTING OF ENGINE MOBILE
TRAILER ASSEMBLY (AVIM) (Cont)
.
7. (Cont)
d.
Fuel Control Unit Check. Check fuel
control unit as follows:
CAUTION
If fuel control unit has been replaced, preservative oil
must be removed before test. Refer to paragraph
1-94, subparagraph 8e(1) for depreserving procedure.
(1) Carry out a motoring run with fuel
cut-off
lever in OPEN position to check for fuel system leaks.
(2) With fuel cutoff carry out a
motoring run to dry out engine.
(3) Perform checks No. 1 through 5
(subparagraphs 2 thru 6).
e.
Checks after Accessory Replacement.
Carry out ground checks as referenced in table below.
The pneumatic portion of fuel control system must be
pressure tested whenever leakage in any portion of
the system is suspected. Any leakage will adversely
affect operation of fuel control. For fuel control
pneumatic system pressure
Ground Checks after Component Replacement
Component Check
Component Replaced
1
2
3
4
5
6
Reference
Power turbine governor
x
x
x
x
x
Subparagraph 7.b
Compressor bleed valve
x
x
x
x
x
Subparagraph 7.c
Starter generator
x
x
x
Ignition system components
x
x
x
Fuel nozzles
x
x
x
x
x
x
Fuel dump valve, manifold
or fuel lines
x
x
x
x
Fuel control unit
x
x
x
x
x
x
Subparagraph 7.d
Fuel pump
x
x
x
x
x
x
Power section
x
x
x
x
x
x
Compressor rotor assembly
x
x
x
x
x
x
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