TACAN channel number-LOAD (select
Key 2 or 8). Enter channel.
Repeat steps a thru j for all TACAN stations.
HSI INTERFACE TEST
Interface test must be performed
after alignment progresses from
state 8 but prior to switching to
Couple INS to FD and engage AP.
Data selector (any position but DSRTK).
CDU TEST-PRESS and HOLD.
MSU and CDU all lamps lit 8's. RMI all angles are
30 degrees. Cross track deviation bar is 1 dot right,
NAV flags are retracted, WX radar NAV display
indicates 1 dot right of course.
On HRI, a 15 degree RH steering command.
annunciated and INS light illuminated.
Continue holding TEST switch from MAN
to AUTO. RMI all angles are 0. Cross
track deviation is one dot left. A 15
degree left steering command is issued.
Release TEST switch-Operations return to
Electric elevator trim and autopilot/flight director
operation-Check as follows:
Pilot and copilot PITCH TRIM switches-
Press to NOSE UP and NOSE DN
positions, singularly and in pairs. Check
that trim wheel moves in proper direction
and operates only when trim switches are
pressed in pairs. Any deviation requires
that electric elevator trim be turned off
and flight conducted using manual trim.
TRIM DISC switch-Press and check that
electric trim disconnects and that ELEV
TRIM light extinguishes.
Flight director (FD) and radio magnetic
indicator (RMI) warning flags masked-
Since the pressure of airflow that
normally opposes movement of
control surfaces is absent during
preflight check, it is possible to
get a hard over control surface
command is allowed to remain
active for any appreciable length
of time. Move turn knob and pitch
check operation, then return them
to the center position.
Select HDG mode-Check.
heading marker under lubber line-Set.
Engage autopilot and check controls stiff,
and AIL HI TORQUE, HDG, and AP ENG
Move HSI heading marker 10° left and
right and verify that FD and control
Press AP/YD disengage switch and verify
that autopilot disengages and that flight
controls are free -Check.
Command 5° trim UP with AP pitch wheel
and verify that manual trim wheel moves
nose UP and AP trim light indicates UP
Press pitch trim switch nose down and
AUTOPILOT TRIM FAIL and MASTER
WARNING lights illuminate-Check.
The AP TRIM FAIL annunciator
will extinguish by pressing the
AP/YD disconnect button on the
control wheel to the first detent.
Repeat steps i thru k above using
Move HSI heading marker to command a
bank on flight director-Check.
Press GO-AROUND switch and verify that
GA annunciator light illuminates, autopilot
commands a wings level, 7 nose-up
Press TEST switch (pilot's HRI) and verify