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 TM 1-1510-223-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
PRIOR TO MAINTENANCE TEST FLIGHT (CONT)
(4) RI line selection switch - Depress to
select SYSTEM BIT page.
(5) R2 line selection switch - Depress to
select INS BIT.
(6) NAV switch-indicator (flight director
mode selector) - Depress.
(7) AP ENGAGE
pushbutton switch -
Depress and
check the following
indications:
(a) Multifunction display - Check that
INS BATT, INS FAIL, and
WAYPOINT
ALERT
are
annunciated.
(b) EHSI - Check that single needle
pointer indicates 30 course
,
deviation bar is displaced right,
then single-needle pointer centering
and course deviation bar displacing
left. Check WPT alert annunciator
illuminated.
(c) Control wheels - Follow course
deviation bar.
(d) INS mode selector - Check that
READY light (green) and BATT
light (red) are illuminated.
(e) Mission annunciator panel - Check
that INS UPDATE annunciator light
(green) and NO INS
2-14
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