a TO indication will appear. The bearing
pointers will indicate a 0 degree magnetic
bearing. The VIR-32 will return to normal
after 15 seconds.
EHSI - Check for three marker indications
on the EHSI and listen for a 30 Hz tone on
the audio channel of NAV system.
ILS self test (NAV 1 and NAV 2):
Tuning knobs (NAV control unit) - Select a
TEST switch (NAV control unit) - Depress.
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.
VIR-32 - Will return to normal after 15
ADF receiver test:
Power and mode switch - On.
Tuning knobs - Tune a nearby NDB,
compass locater, or broadcast station.
EFIS display controller - Select ADF on the
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.
TACAN/DME indicator system:
The TACAN/DME will conduct a self test for
3 seconds after power-up. After 3 seconds,
check for SELF TEST PASS or SELF TEST
FAIL (with a fail message number).
MASTER switch - STBY.
Warmup - Allow two minutes.
Mode 1 and mode 3/A codes - Set.
Lamp indicators - Press to test.
Antenna switch - Select TOP.