TM 55-1510-222-MTF
PROCEDURE
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)
operation. HOLD key will
dim.
o. Leg switching - Check as fol-
lows:
(1)
(2)
(3)
(4)
(5)
(6)
INS - Set up for manual
flyover when approaching
waypoint.
ALERT indicator - Moni-
tor. (The ALERT monitor
will illuminate approxi-
mately two minutes be-
fore
the
waypoint
is
r e a c h e d . )
Data selector - L/L POS
(when
approaching
waypoint).
H O L D k e y - D e p r e s s
when
closest to
the
waypoint.
Present position readout -
Record.
Error distance (if any) -
Visually estimate between
the location at which the
HOLD
button
was
pressed and the location
of the waypoint.
Compare the frozen INS
display of present posi-
tion with the coordinates
of the waypoint, taking
into account the visually
observed error distance.
This position error shall
not exceed 1200 feet.
4-20
