TM 11-4920-292-15
ing knob in the direction of the symbol
until the window is blank.
appearing in the annunciator window
Allow sufficient time for system syn-
until the window is blank.
chronization to settle out before re-
Allow sufficient time for system syn-
cording error readings.
chronization to settle out before re-
(6) Set the POWER ON-POWER OFF
cording error readings.
switch to POWER OFF.
(7) Set the POWER ON-POWER OFF
(7) Remove power to the compass system.
SWITCH to POWER OFF.
CAUTION
(8) Remove power to the compass system.
Do not disturb N-S and E-W adjust-
(9) Remove all adapter cables and return
ments of the magnetic compensator
the system to its original configuration.
when removing the one-cycle cable,
e. Perform system error compensation for
(8) Remove all adapter cables and return
reference No. 7 as follows:
the system to its original configuration.
(1) Disconnect the CX-10939/ASN from
d. Perform system error compensation for
cable (W2).
reference Nos. 2 and 6 as follows:
(2) Connect the compass calibrator to the
CAUTION
aircraft compass system in accordance with
Do not disturb N-S and E-W adjust-
ments of the magnetic compensator
(3) Apply power to the compass system.
when removing the adapter cable.
(4) Set the control console switches as
(1) Remove the one-cycle adapter cable
follows:
from the compass transmitter. Connect air-
(a) MODE SELECTOR: IND.
craft wiring and compensator to the compass
(b) READOUT SELECT: EXT CX,
(c) POWER ON-POWER OFF: POW-
(2) Connect the compass calibrator to the
ER ON.
aircraft compass system as shown in figure
(5) Adjust the VOLTS ADJUST control
until the EXC VOLTS meter indicates 23.5
(3) Apply power to the compass system.
volts.
(4) Set the control console switches as
(6) Set the HEADING SELECTOR
follows:
switch in 150 increments. Synchronize Com-
(a) MODE SELECTOR: IND.
pass System MA-1 with its controller, and ad-
(b) READOUT SELECT: EXT CX.
just Compensator KE-28 to obtain zero error
(c) POWER ON-POWER OFF: POW-
at each heading as read on the ERROR read-
ER ON.
out. Make recordings in table F2 of the swing
(5) Adjust the VOLTS ADJUST control
data sheet.
until the EXC VOLTS meter indicates 23.5
NOTE
volts.
Allow sufficient time for slaving signal
(6) Set the HEADING SELECTOR
to reach a null after synchronizing the
switch in 150 increments. At each heading,
system.
synchronize the compass system with the
(7) When the system is fully compensated,
synchronizing control on the compass indicator.
remove all adapter cables and return the sys-
Record the heading errors as read on the
tem to its original configuration.
ERROR readout in table F2 of the swing data
f. Perform one-cycle and system error com-
sheet.
pensation for reference No. 3 as follows:
NOTE
(1) Connect the compass calibrator to the
Synchronization is accomplished by
aircraft compass system in accordance with
pressing and rotating the synchroniz-
9-22
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