TM 11-4920-292-15
(4) Remove electrical connections from
270 MINUTES switch to the nearest 3-minute
position, and the ∆ 270 polarity switch to the
the compass transmitter.
sign ( + or ) of the error.
(5) Mount the adapter on the compass
transmitter in accordance with the applicable
(13) Set the HEADING SELECTOR
figure (figs. 9-6 through 9-12).
switch to 0, 90, 180, and 270 DEGREES, Record
(6) Mount the telescope on the adapter.
the ERROR readout indication at each heading
Be sure that all screws are properly seated and
in the corrected electrical swing column of table
there is no motion in adapters.
D of the swing data sheet. Errors shall be with-
in 6 minutes of corrected manual swing
NOTE
errors at each heading.
On horizontal adapters, the telescope
(14) Set the POWER ON-POWER OFF
may be attached in an upright or in-
switch to POWER OFF.
verted position.
b. Sight the target from the turntable loca-
tion as follows:
CAUTION
(1) Rotate the turntable assembly to a
heading of 0O.
Optical transfer is a critical proce-
(2) Lock the turntable assembly upper
dure; be extremely careful to prevent
motion.
the compass transmitter from being
jarred, upset, or knocked out of ad-
(3) Loosen the telescope azimuth clamp.
justment before it is fully secured in
(4) Rotate the telescope to sight the target
aircraft.
which is at least 1/2 mile away. Be sure that the
target can also be sighted when the compass
a. Set up the equipment as follows:
transmitter is mounted in the aircraft,
(1) Remove the telescope from the align-
(5) Tighten the telescope azimuth clamp.
ment equipment case. (Refer to figure 9-6 for
(6) Loosen the telescope fine adjustment
location of the telescope controls.)
clamp.
(2) Refer to the chart below and remove
(7) Make a fine adjustment on the target
applicable compass calibrator set adapter from
with the telescope fine azimuth adjustment
the MK-1040A/ASN.
screw.
(8) Center the telescope bubble level. Be
Refer
Compass
to fig.
calibrator
Sperry
sure that target remains centered in crosshair.
part No.
For aircraft type-
set adapter
If necessary, adjust the telescope.
(9) Tap the telescope lightly at the eye
MX-8162/ASN 2592699
8D, U-21.
end. Be sure that the target remains centered in
97 CH-47, CH-47A-
MX-8166/ASN 2592734-901
the crosshair. If necessary, tighten the mount-
9-8 AH-lG, UH1B,
MX-8164/ASN 2592721
ing screws and adjust the telescope.
UH-1C, UH-1D,
UH-1H.
(10) Tighten the telescope fine adjustment
MX-8165/ASN 2592725
clamp.
MX-8167/ASN 2592738
(11) Set the telescope drum dial to 0 by
MX-8153/ASN 2592710
9-12 U-8 -----------
rotating the drum dial itself. Be sure that the
target remains centered in the crosshair and
1
Optical transfer adapter for U-8 aircraft with ML-1 is not p:
the level bubble is centered. If necessary, ad-
of the MK-1040A/ASN. Use coupling shaft (part No. 2680256) a
plate (part No. 2566563 ) from alignment equipment case.
just telescope.
(3) Loosen the turntable assembly upper
(12) Move the turntable assembly (with
motion lock during the following procedures
the optical transfer equipment attached) aside.
to prevent any inadvertent torque against lower
c. Determine the aircraft misalignment as
motion.
follows :
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