TM 55-1510-222-MTF
P R O C E D U R E
T R O U B L E S H O O T I N G
R E F E R E N C E
G. AVIONICS FLIGHT CHECKS (CONT)
tion shown in the left-
hand display with the dis-
tance shown on the INS
TACAN range display.
(10) Mission control panel -
Check that INS UPDATE
annunciator light is illu-
minated.
(11) Data selector - Return
INS to normal by setting
to any position except
WYPT or DIS/TIME.
c. Ground
track
angle
and
ground speed - Check as fol-
lows:
(1)
(2)
(3)
Data selector - TK/(GS.
Left-hand display Read
correct ground track angle
to the nearest tenth of a
degree. Compare with
course deviation Indica-
tor.
Right-hand display - Read
correct ground speed to
the nearest knot. Com-
pare with airspeed Indica-
tor.
d. Heading and drift angle -
Check as follows:
(1) Data selector - HDG/DA.
(2) Left-hand display - Read
true aircraft heading to
the nearest tenth of a de-
gree.
Compare
with
4-12
