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SECTION III. FUNCTIONAL 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 5-1. AADS Bonding Resistance Test.
TM
9-1270-219-13&P
AADS Preliminary Test. Perform
a
Set S16 to HTR CCHK and
b. H e a t e r
Test.
with
the
Digital
(DVM)
set
to
Resistance
Test,
as
shown
in
using
the
ohms check that the resistance between test
Multimeter set to the lowest resistance range. Check that
p o i n t s 15 (+ve) and 16 on the Test Set is
t h e resistance between the pitot head and the helicopter
87 ohms + 10 ohms.
bonding point on the AADS body is less than 0.2 ohm.
5-6.
AADS
Functional
Tests.
Temperature Sensor Initial Check.
c.
(1) Set S16 to TEMP and with the Digital
a. A n g u l a r O u t p u t s A c c u r a c y T e s t .
Voltmeter set to Ohms check that the
resistance between test points 15 (+ve)
a n d 16 on the test set is 500 200
(1)
C o n n e c t the AADS for test as shown
ohms.
in figure 5-2. Set test set switches CB1
and CB2 to ON and check that the
associated
indicator
lamps
illuminate.
d. Static Pressure Leak Test.
L o c a t e pitot head in clamped position
(2)
i n checking fixture as shown in figure
(1) Set test set switches CB1 and CB2 to
OFF.
Remove
the
interconnection
harness from the AADS and release
the
pitot
head
from
the
clamped
Set S16 to Sin ∝ a n d u s i n g t h e D V M
(3)
position.
set to dc volts measure and record the
voltage
across
test
points
TP
15
(2) Loosen the two threaded joints of the
(positive lead) and TP 16 (negative
pitot
head
adaptor
by
lead) on the Test Set. (See fig. 1-32).
t u r n i n g the components of the adapter
1
turn
counterclockwise.
through
Set S16 to Cos ∝ and using the DVM
(4)
set to dc volts measure and record the
(3) Push the pitot head adapter over the
voltage across test points 15 (+ve) and
p i t o t head until resistance is felt and
16 on the Test Set.
tighten
the
adapter
handtight.
See
Verify that the combination plot of
(5)
the values obtained at (3) and (4)
( 4 ) S c r e w t h e a d a p t e r s i n t o t h e PT a n d PS
above lies within the specified pass
connectors on the body of the AADS.
band of figure 5-4.
(5)
Connect
the
pneumatic
circuit
shown
Set
S16
to
Sin
and
using
the
(6)
DVM set to dc volts measure and
r e c o r d the voltage between test points
(6)
Close
the
capacity
tank
vent
and
15 (+ve) and 16 on the Test Set.
shut-off valves. Close the tester vent
valve and open the pressure source
valve. Apply a pressure of 255 - 265
Set
S16
to
Cos
and
using
the
(7)
Kn (3.2-3.5 in. Hg).
DVM set to dc volts measure and
r e c o r d the voltage between test points
(7)
Open
the
capacity
tank
shut-off
15 (+ve) and 16 on the Test Set.
valve.
Verify that the combination plot of
(8) Start the stopwatch when the pressure
(8)
falls to 250 kn (3.1 in. Hg) and check
the values obtained at tests (6) and (7)
that after 110 seconds the pressure is
above lies within the specified pass
more than 50 kn (0.12 in. Hg).
band of figure 5-5.
5-3

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