TM 55-1510-215-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
DURING CRUISE (CONT)
i.
Fly a 90° right turn such that the
K28
flight path is at a 90° angle to the direction
to the station. The course deviation bar
should deflect noticeably to the left after
one or two miles of flight (assuming the
station is 25 to 50 miles from the aircraft).
j.
VOR range test: Achieve adequate
usable reception at 45 miles at 1,250 feet
above station antenna altitude.
k.
Verify that HSI's and RMI's display the
same bearing and course indications
within ± 4 degrees.
l.
Ground-track accuracy test: Fly aircraft
over a predetermined ground check point.
The maximum error shall not exceed the
specified minimums for IFR flight in FAR
91.25.
m.
Glideslope/marker beacon functions -
Check as follows:
(1)
Frequency selectors (VOR control panel) -
Set test frequency.
(2)
Fly an ILS approach monitoring
K31
localizer and glideslope indicators for
proper operation.
2-60
