TM 1-1520-238-MTF
2-23
PROCEDURE
TROUBLESHOOTING
REFERENCE
AFTER STARTING APU (CONT)
(f) HSI No. 2 bearing pointer
and RMI pointer rotate 90
from original position and
then return to their original
positions.
*c. Transponder – Test as follows:
(1) MASTER rotary switch – Verify
in STBY. Note NO-GO lamp is
illuminated.
(2) Operate the press-to-test
feature of the indicator lamps.
(3) ANT switch – BOT.
(4) MASTER rotary switch –
NORM.
(5) M-1 switch – TEST. TEST-GO
indicator should illuminate.
(6) M-1 switch – ON.
(7) Repeat steps (5) and (6) for
M-2, M-3/A, and M-C switches.
NOTE
If altitude encoding is not connected, testing
MODE C will result in a failed indication.
(8) ANT switch – TOP.
