TM 55-1520-240-23-6
7-16.1
FLUSHING SERIOUSLY CONTAMINATED FLIGHT CONTROL OR UTILITY HYDRAULIC
SYSTEMS
(Continued)
7-16.1
94.
Connect exciter cable (48) to APU spark plug
(49).
95.
Open APU fuel shut-off valve (51).
APU START ACCUMULATOR
96.
Check APU start accumulator gage (53) in ramp
area indicates between 1800 and 2050 psi.
97.
Turn EMERG UTIL PRESS valve handle (54)
to OPEN.
98.
Press depressurization valve (55) on APU start
module (56). Hold until sound of depressurizing
has stopped. Release valve.
99.
Allow APU accumulator air-charge valve (57) to
fill.
100.
Repeat steps 98 and 99 five times.
101.
Turn EMERG UTIL PRESS valve handle (54)
to NORMAL.
102.
Shut down external hydraulic power. (Refer to
applicable manual.)
7-120