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8. Once localizer course capture has
occurred on an ILS approach, the
glideslope mode is armed. Automatic
capture occurs as the aircraft
approaches the glideslope from either
above or below. When the intercept
occurs, ' G S is illuminated on the
annunciator panel. The autopilot will
maintain the glideslope with pitch cor-
rections.
If
altitude hold (ALT) mode
had been engaged prior to
GS
cap-
ture, it will disengage at capture and
the ALT light will go out.
NOTE: GS is locked out on VOR or
RNAV APR.
I
APPROACH (APR) MODE
USING THE OPTIONAL KI
525A PNI
The approach (APR) mode allows the
autopilot to intercept and track ILS (both
localizer and glideslope), VOR and RNAV
courses. To operate in the APR mode:
1. Tune the frequency for the selected
ILS, VOR or RNAV approach.
2. Set the final approach course on the
KI 525A PNI.
3.
Establish the desired intercept angle
by setting the heading 'bug" on the
intercept heading and activate the
HDG mode. (HDG will illuminate.)
4. Depress the "APR" button on the KC
191 (APR light will flash to signify that
APR mode
is
armed).
NOTE: If the APR mode is selected with
the aircraft level within *4 degrees and
within 2-3 dots of course deviation, APR
arm mode will be bypassed and the APR
mode will engage directly.
42
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