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Figure 4-7. Pneumatic Circuit for EPU and Plumbing Pilot 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 4-8. Pneumatic Circuit for EPU and Plumbing Pitot and Static Leak Test.
TM 9-1270-219-13&P
i.
Static Plumbing Leak Test.
EPU and Plumbing Pitot Static Leak Test.
g.
Connect the pneumatic circuit as shown in
(1)
(1)
Connect
the
pneumatic
circuit
as
shown
Close the static vent valve on the tester.
(2)
Close the vent valve on the tank.
With the tester static vent open and the
(3)
altimeter
baro-set
adjusted
to
29.92
in.
I t is essential that pitot and static lines
H g . note the tester altimeter reading (approx.
are teed together as shown to avoid
airfield
elevation).
damage to the EPU.
Close the static valve on the tester. Reduce
(4)
the static pressure at the tester to 10,000
feet.
With the tester static vent open and the
(2)
altimeter
baro-set
adjusted
to
29.92
in.
(5)
Observe
the
altimeter
and
note
the
loss
H g . note the tester altimeter reading (approx.
of
altitude
over
a
period
of
120
seconds.
airfield
elevation).
Check on figure 4-10 that the altitude loss
(6)
Close the static vent valve on the tester.
(3)
is
acceptable
at
the
appropriate
airfield
Reduce the static pressure at the tester
elevation.
to 10,000 feet.
Open the tank vent valve to release the
(7)
(4)
Observe
the
altimeter
and
note
the
loss
pressure.
of
altitude
over
a
period
of
120
seconds.
D i s c o n n e c t the pneumatic circuit.
(8)
Check on figure 4-9 that the altitude loss
(5)
is
acceptable
at
the
appropriate
airfield
EPU Pitot Leak Test.
elevation.
j.
(1)
Connect
the
pneumatic
circuit
as
shown
Open the tank vent valve to release the
(6)
in
pressure.
(7)
D i s c o n n e c t the pneumatic circuit.
(2) Repeat the leak test given in sub-para. h. (3)
through
(5).
h. P i t o t P l u m b i n g L e a k T e s t .
k. EPU Pitot and Static Leak Test.
(1)
D i s c o n n e c t the union nuts on the Pt and Ps
(1) Connect the pneumatic circuit as shown in
c o n n e c t o r s at the EPU. Leave the Pt and Ps
adapters installed in the EPU.
(2)
Connect
the
pneumatic
circuit
as
shown
Close the pitot vent valve on the tester.
(3)
C l o s e the vent valve on the tank. Raise the
It
is
essential
that
pitot
static
lines
pitot pressure at the tester to 175 knots and
are
teed together as shown to avoid
observe the airspeed indicator.
damage to the EPU.
(4)
O v e r a period of 120 seconds the indication
shall not fall below 171 knots.
(2) Repeat the leakage test of sub-para i. (2)
(5)
Open the tank vent valve to release the
through
(8).
pressure.
4-14

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