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Table 5-8. Altitude Calibration Check.
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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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Section IV TROUBLESHOOTING
TM 9-1270-219-13&P
(4)
S e t t e s t s e t s w i t c h S 1 7 Vlu K N
(see
LAI Functional Tests.
to
50.
Check
that
the
fore-aft
pointer on the LAI indicates 50kn 3kn
a. Calibration and Status Flag Operation.
down. Check that the LAI status flag shows
g o o d (all black) and the LAI FLR lamp on
(1) Set switches on the LAI section of the test
the test set is extinguished.
set as follows; switches S17 V  lu KN and S18
KN  to  0  and  switches  S19
PANEL
V Iv
Vlu K N
to
20.
Set
test
set
switch
S17
(5)
L I G H T S and S20 ADS FLR down.
C h e c k that the fore-aft pointer on the LAI
indicates 20kn 2kn down. Check that the
NOTE
s t a t u s flag on the LAI shows good and the
L A I FLR lamp on the test is extinguished.
A l l readings taken from the LAI must be
viewed head-on at a minimum distance
(6)
VIu KN
to
+20.
Set
test
set
switch
S17
of 18 inches from the instrument face.
C h e c k that the fore-aft pointer on the LAI
indicates 20kn 2kn up. Check that the
s t a t u s flag on the LAI shows good and the
Check that the LAI pointers indicate Okn
(2)
LAI
FLR
lamp
on
the
test
set
is
and
fore-aft
lateral
for
both
2kn
extinguished.
movements.
( s e e fig. 1-29). The pointers
will be within the diameter of the center
Vlu K N
to
+45.
Set
test
set
switch
S17
(7)
spot on the LAI face.
Check
that
the
fore-aft
pointer
indicates
45kn 3kn up. Check that the LAI status
f l a g shows good and the LAI FLR lamp on
(3)
set  switch  S17  VIu KN
(see
Set  test
to
OUT
AFT.
Check
that
the
LAI
the test set is extinguished.
status flag shows the fail condition (red and
S e t t e s t s e t s w i t c h S 1 7 Vlu K N t o + 5 1 t o
black
diagonal
stripes)
and
the
LAI
FLR
(8)
test LAI overrange (O/R) function. Check
lamp on the test set is illuminated.

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