TB 1-1520-238-20-116
CAUTION
The Auxilliary Power Unit (AGPU) must not be placed under a main
rotor blade because the extreme heat from the AGPU exhaust can lead
to main rotor blade damage.
(b) Position AGPU parallel to right wing tip in accordance with TM 1--1520--238--23, para-
graph 1.72, or TM 1--1520--Longbow/Apache (IETM).
(c) Attach AGPU pressure line to primary ground pressure coupling in accordance with TM
1--1520--238--23, paragraph 1.72, or TM 1--1520--Longbow/Apache (IETM).
(d) Attach AGPU air hose to aircraft in accordance with TM 1--1520--238--23, paragraph
1.71, or TM 1--1520--Longbow/Apache (IETM).
(e) Operate AGPU as described in TM 55--1730--229--12, paragraph 2--6 to supply air; set
up AGPU hydraulic system to apply 1000 psi; and switch hydraulic output to ON.
(f) Open sampling tool valve to initiate hydraulic fluid flow, and collect sample per paragraph
8.a.
(g) Switch AGPU hydraulic output switch to OFF and decrease pressure to 500 psi.
(h) Switch hydraulic power and AGPU pneumatic power switches to OFF positions.
(i) Make sure that lines are depressurized, and then disconnect and stow air hoses and
high--pressure hydraulic lines.
(j) Disconnect sampling tool and install protective caps on both aircraft hydraulic ports and
AGPU hoses. Clean all spilled hydraulic fluid.
(k) Inspect reservoir for fluid level and service as required in accordance with TM
1--1520--238--23, paragraph 1.34, or TM 1--1520--Longbow/Apache (IETM).
9.
Correction Procedures
a. Contaminated Tested AGPU Sample.
(1) Open access panel R325 to gain access to GSE panel.
(2) Locate AGPU with dual hydraulic manifold that has been properly sampled and cleared for
operation in accordance with paragraph 8.a. Ensure that reservoir is full.
(3) Position AGPU parallel to right wing tip in accordance with TM 1--1520--238--23, paragraph
1.72 or TM 1--1520--Longbow/Apache (IETM).
(4) Connect AGPU to aircraft primary and utility GSE connectors in accordance with TM
55--1730--229--12, paragraph 2--7.d; TM 1--1520--238--23, paragraphs 1.72 and 1.73 or TM 1--1520--Long-
bow/Apache (IETM).
(5) Connect hose to drain connector on AGPU dual service manifold, drain port and place oppo-
site end of hose in clean 10--gallon (minimum) container. Any AGPU adapter hose can be used as drain hose
by removing quick disconnect couplings at both ends.
(6) Ensure bypass/flush drain valves are closed.
CAUTION
Refer to the pilot/copilot gunner station accessing safety precautions
prior to entering pilot's station. Heed all cautions and obey any instruc-
tions as presented in the appropriate manual.
(7) Enter pilot/copilot gunner station.
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