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Figure 5-6. Pneumatic Circuit-Static Pressure Leak Test and Static Pressure-Path Flow 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 5-8. EPU Test Electrical Connections (Sheet 1 of 2).
TM 9-1270-219-13&P
5-7.
Testing of the Electronics Processor Unit.
(2)
Functional
Tests
Self Test
(a)
a. T e s t
Requirements.
As a final inspection, the
T r u e Airspeed Calibration Check
(b)
EPU will be subjected to the following tests.
Monitoring Check
(c)
Any
LRU
which
fails
any
test
will
be
s u b j e c t e d to Troubleshooting, Section IV.
A i r Temperature Calibration Check
(d)
L A I Power Supply Test
(e)
(1)
Preliminary
Tests
(f)
Pitot Pressure Leak Tests
I n d i c a t e d Airspeed Calibration Check
(g)
(a) Bonding Resistance Test
(h)
Static Pressure Leak Tests
Altitude
Calibration
Check
(b)
Current
Consumption
Test
(i)
b. T e s t
Equipment
Required.
Table 5-3. Test Equipment for EPU Testing.
Nomenclature
Part No.
NSN
Test Station ADS (LRU)
4931-01-074-3322
95-112-02
Digital
1430-00-366-8753
8125A
AN/USM
233
Stopwatch
GC-S-764-T1-C2
Tester Pitot Static Systems
MB-1A
Manometer,
Inclined
Tube
C a p a c i t y Tank Dual Purpose
60SK6240
EPU Preliminary Tests.
check
that
the
current
current,
b e t w e e n test points 13 and 14 on the
Using
the
a.
Test Set is 1.4A 0.2A when test set
set
to
the
lowest
resistance
switch S13 is depressed.
range, check that the resistance between the
EPU
bonding
point
and
any
E P U Functional Tests (See Fig. 1-14 and 1-32).
exposed metal surface of the EPU is less
NOTE
than 0.1 ohms.
Unless
otherwise
specified
the
Angle
b.
Current Consumption Test.
Resolver Dials B1 and B2 on the Test Set
should
always
be
set
such
that
the
(1) Connect the EPU for test as shown in
difference between their settings never
exceeds 65 degrees. If the difference does
e x c e e d 65 degrees an ADS FLR and ADS
(2) Switch on power to test set by setting
NO GO light will illuminate on the Test Set
C B 1 and CB2 to ON. (See fig. 1-32).
and an ADS failure will be displayed on the
E P U . This condition can be cancelled by
(3) Set test set switch S12 to EPU 28V,
setting
the
difference
between
the
and
using
the
set
to
dc

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