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Figure 4-14. Pneumatic Circuit for EPU Pitot and Static Leak Test.
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TM-9-1270-219-13-P Fire and Flight Air Data Subsystem Helicopter Armament: XM 143 PN 03-004-02 Manual
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Figure 4-15. Pneumatic Circuit for ADS Pilot Leak Test
TM 9-1270-219-13&P
L e a k T e s t s W h e n R e p l a c i n g L R U s . Leak
tests
I. S u b s y s t e m P i t o t L e a k T e s t .
must be performed
on
the
EPU
and
the
AADS
after
installation. No leak tests are necessary after installation
Connect the pneumatic circuit as shown in
(1)
o f the LAI. In order to leak test the installed EPU, it is
necessary to remove the AADS.
a. Leak Tests When Replacing the AADS.
R e p e a t the leakage test given in sub-para d.
(2)
( 4 ) through (7).
leak tests
Perform the EPU and plumbing
(1)
(paragraph 4-12 f. and g.).
m. Subsystem Pitot and Static Leak Test.
Install the AADS.
(2)
(1) Connect the pneumatic circuit as depicted in
Perform the subsystem leak tests (paragraph
(3)
4-12 l. and m.).
b. Leak Tests When Replacing the EPU.
Install the EPU (paragraph 4-6).
(1)
Remove the AADS (paragraph 4-3)
(2)
I t is essential that pitot and static lines
are teed together as shown to avoid
Perform the EPU and plumbing
leak tests
(3)
damage to the EPU.
(paragraph 4-12 f. and g.).
(4)
Install the AADS (paragraph 4-2).
Perform the subsystem leak tests (paragraph
(5)
(2) Repeat the leakage test of sub-para. e. (2)
through
(7).
4-12 I. and m.).
4-21

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