TM 11-4920-292-15
sator N-S screw to remove one-half the error.
(5) Record the ERROR readout indica-
Record in table F1 of swing data sheet.
tion as monitor zero error on line F-1 of the
swing data sheet.
(18) Set the HEADING SELECTOR
switch to 270 DEGREES. Adjust the compen-
(6) Determine the MISAL switch settings
sator E-W screw to remove one-half the error.
from the equation given in section F of the
Record in table F1 of swing data sheet.
swing data sheet. Record this value on line
F-2 of the swing data sheet. Set the MISAL
(19) Set the HEADING SELECTOR
MINUTES and polarity switches to this value.
switch to 0, 90, 180, and 270 DEGREES. Re-
cord the ERROR readout indication at each
(7) Check to see that the E1 CHECK,
E2 CHECK, ∆180 MINUTES, and ∆270 MIN-
heading in table F1 of the swing data sheet.
UTES and polarity settings have not been
(20) The error at 0 shall equal the error
changed from those values recorded on lines
at 180 (N-S ) within 12 minutes. The error
C-3, C-4, D-3, and D4 of the swing data
at 90 shall equal error at 270 (E-W) within
sheet. Record these values on lines F-3 through
12 minutes. If necessary, repeat compensation
F-6 of the swing data sheet.
beginning with the procedures given in (15)
above.
(8) Set the E1 CHECK-E2 CHECK
switch to E1 CHECK.
(21) Set the POWER ON-POWER OFF
switch to POWER OFF.
(9) Set the READOUT SELECT switch
to 90.
(22) Refer to table 9-2 and select the
applicable compass system swing procedure,
(10) Adjust the E1 VOLTS controls until
the NULL INDICATOR meter indicates a null.
c. Perform system error compensation for
Record the E2 VOLTS control settings on line
reference Nos. 1 and 4 as follows:
F-7 of the swing data sheet.
(1) Connect the compass calibrator to the
(11) Set the E1 CHECK-E2 CHECK
aircraft compass system in accordance with
switch to E2 CHECK.
(12) Adjust the E2 VOLTS controls until
(2) Apply power to the compass system.
the NULL INDICATOR meter indicates a null.
(3) Set the control console switches as
Record the E VOLTS control settings on line
follows:
F-8 of the swing data sheet.
(a) MODE SELECTOR: IND.
(13) Se the E1 CHECK-E2 CHECK
(b) READOUT SELECT: 0.
switch to OFF.
(c) POWER ON-POWER OFF:
(14) Set the MODE SELECTOR switch to
POWER ON.
CAL.
(4) Adjust the VOLTS ADJUST control
(15) Set the HEADING SELECTOR
until the EXC VOLTS meter indicates 23.5
switch to O DEGREES. Adjust the compensator
volts.
N-S screw to obtain a HEADING and ERROR
(5) Set the HEADING SELECTOR
readout indication of 0 DEGREES 15 MIN-
switch in 15 increments. At each heading,
UTES. Record the error in table F1 of the
synchronize the compass system with the syn-
swing data sheet. Use the nonmagnetic (brass)
chronizing control on the compass indicator.
screwdriver from the alignment equipment
Record the heading errors as read on the air-
case.
craft compass indicator in table F2 of the swing
(16) Set the HEADING SELECTOR
data sheet.
switch to 90 DEGREES. Adjust the compen-
sator E-W screw for a HEADING and ERROR
NOTE
readout indication of 90 DEGREES 15 MIN-
Synchronization is accomplished by
UTES. Record in table F1 of swing data sheet.
pressing and rotating the synchronizing
(17) Set the HEADING SELECTOR
knob in the direction of the symbol
switch to 180 DEGREES. Adjust the compen-
appearing in the annunciator window
9-21
Previous Page
