TM 55-1510-219-MTF
PROCEDURE TROUBLESHOOTING REFERENCE
F. AVIONICS FLIGHT CHECKS (CONT)
operation. HOLD key will dim.
n.
Leg Switching - Check as follows:
(1)
INS - Set up for manual flyover when approaching
waypoint.
(2)
ALERT indicator - Monitor. (The ALERT monitor will
illuminate approximately two minutes before the
waypoint is reached.)
(3)
Data selector - L/L POS (when approaching waypoint).
(4)
HOLD key - Depress when closest to the waypoint.
(5)
Present position readout - Record.
(6)
Error distance (if any) - Visually estimate between the
location at which the HOLD button was pressed and
the location of the waypoint.
(7)
Compare the frozen INS display of present position
with the coordinates of the waypoint, taking into
account the visually observed error distance. This
position error shall not exceed 1200 feet.
4-20
