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Figure 5-11. Pneumatic Connection to Water Manometer.
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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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LAI Functional Tests.
TM 9-1270-219-13&P
Table 5-8. Altitude Calibration Check.
Data Word
Pressure Input
Test
Display
Point
Ft.
mb
Tol.
Nominal
±2
1050.41
1
­1000
224
±2
2
1013.25
­0
203
±2
3
123
+4000
875.10
±2
4
752.62
+8000
52
(1)
Preliminary
Tests
5-10. Testing of the Low Airspeed Indicator (LAI).
(a) Bonding Resistance Test
(b)
Current
Consumption
Test
To
confirm
a
fault
a. T e s t
Requirements.
(2) Functional Tests
r e p o r t e d by AVUM level, the LAI will be subjected to the
(a)
and
Status
Flag
Operation
following
tests.
Any
LAI
which
fails
any
test
will
be
r e t u r n e d to Depot for repair.
(b) Panel Lighting
b. T e s t E q u i p m e n t R e q u i r e d .
Table 5-9. Test Equipment for LAI Testing.
I
NSN
Part No.
Nomenclature
4931-01-074-3322
T e s t Station ADS (LRU)
95-112-02
Voltmeter, Digital
8125A
1430-00-366-8753
Multimeter
AN/USM
233
(2) Set test set switch CB1 and CB2 to ON (see
LAI Preliminary Tests.
and
check
that
the
associated
Iamps
illuminate.
B o n d i n g R e s i s t a n c e T e s t . Using
the
Multimeter
a.
( 3 ) Set test set switch S12 to LAI + 15V and set
set to the lowest ohms range, check that the resistance
the Multimeter to dc current. Check the
between the bonding point on the instrument bezel and
current between test points 13 (+ve) and 14
any exposed metal work on the rear connector is less
i n d i c a t e d on the Multimeter, when test set
than 0.1 ohms.
switch S14 is depressed, is less than 0.3
amperes.
( 4 ) Set test set switch S12 to LAI­15V and set
b. C u r r e n t C o n s u m p t i o n T e s t .
t h e Multimeter to dc current. Check that the
current between test points 13 (+ve) and 14
i n d i c a t e d on the Multimeter, when test set
switch S15 is depressed, is less than 0.3
(1) Connect the LAI to the test equipment as
amperes.
shown in figure 5-12.

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