TM 1-1510-224-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
PRIOR TO MAINTENANCE TEST FLIGHT (CONT)
(1)
Tuning knobs (NAV control unit) -
Select a localizer frequency.
(2)
TEST switch (NAV control unit) -
Depress.
(3)
The NAV and GS flags on EHSI -
Will come into view. After 3
seconds, the flags will go out of
view, the EHSI course deviation bar
will deflect right 2/3 full scale, and
the glide slope pointer will deflect
down 2/3 full scale.
(4)
VIR-32 - Will return to normal after
15 seconds.
*38.
ADF receiver - test as follows:
(a)
Power and mode switch - On.
(b)
Tuning knobs - Tune a nearby NDB,
compass locater, or broadcast station.
(c)
EFIS display controller - Select ADF on
the single needle pointer bearing source
selector switch.
(d)
TEST switch - Depress. Bearing pointer
will rotate 90 degrees from the previous
indication. Release TEST switch and
verify the bearing pointer returns to the
previous indication.
*39.
TACAN/DME indicator system:
(a)
TACAN/DME - Will conduct a self test for
3 seconds after power-up. After 3
seconds, check
2-26
