User manual
Table Of Contents
62 63
62 63
NAVIGATION (NAV ARM and NAV CPLD) Mode
The NAV mode provides visual bank commands on the Flight Com-
mand Indicator and deviation guidance on the HSI to intercept and
track a VOR course or an GPS course.
Operation of the NAV mode requires the pilot to:
Tune the frequency of the selected VOR (or VORTAC) station.
Set the HSI course pointer on the desired course.
Establish angle of intercept by setting the heading „bug” and
activate „HDG” mode.
Depress the NAV button on the Mode Controller.
When the „NAV” button on the Mode Controller is depressed, „NAV
ARM” will be lighted on the Annunciator Panel and the automatic
capture circuit is armed. Heading select, if operating, is retained until
capture occurs.
The VOR „course-capture’’ point is variable to prevent overshoot and
depends on angle of intercept and the rate the course deviation is
changing. Upon capture, a bank command will be displayed on the
FCI; the HDG, if on, will be cancelled and „NAV CPLD” will be lighted
on the Annunciator Panel.
The pilot can manually bank the aircraft to satisfy the command display
which will call for a rollout to level flight when on course centerline to
track the course. Crosswind compensation is provided in the „track“
state.
If the NAV mode is selected with the aircraft level within ±4° of bank
and within three dots of course deviation, NAV ARM will be bypassed
and NAV CPLD will engage directly.
If the Autopilot is engaged, the aircraft will bank to satisfy the com-
mand display and rollout on course automatically.
Upon station (or waypoint) passage, an outbound course other than
the inbound reciprocal can be selected by resetting the NAV course
arrow on the HSI. This will cause an immediate V-bar deflection on the
FCI directing a turn to the new course.
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