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Page Title:
Audio control panel and interphone system |
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 TM 1-1510-223-MTF
'PROCEDURE
TROUBLESHOOTING
REFERENCE
j.
INS UPDATE annunciator light (mission
control panel) - monitor. Illumination
indicates satisfactory TACAN updating of
the INS.
k.
R5 line selection switch - Depress to select
INS SETUP page.
l.
R3 line selection switch - Depress to change
AUTO MIXING mode
to GPS.
m. INS UPDATE annunciator light (mission
control panel) - monitor.
Illumination indicates
satisfactory
GPS
updating of the INS.
n.
INS/TACAN pushbutton selector switch
(display controller) - Depress to select INS.
o.
NAV mode switch-indicator (flight director
mode selector) - Depress to select NAV
mode.
p.
Autopilot
ENGAGE
switch indicator -
Depress to engage autopilot. Observe EFIS
displays LNAV information and autopilot
follows LNAV heading signals.
q.
After landing, taxi aircraft to a location
whose geographical coordinates are known,
and compare INS position indication to
actual coordinates. Verify that INS position
indication is within 1250 feet of known
location.
* 4. Audio control panel and interphone
system Check each unit as follows:
a.
Interphone functional check:
(1) RADIO MON switches OFF.
4-11
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