APPROACH (APPRIARM
and
APPRICPLD, GSICPLD)
Mode
The APPR mode provides visual roll and
pitch commands on the FCI V-bar to capture
and track precision ILS (LOC and Glide-
slope) beams, or non-precision VOR or
RNAV radials. Lateral and vertical deviation
can be monitored on the PNI.
Operation of the APPR mode requires
the pilot to:
1.
Set the NAV receiver frequency.
2.
Set the PNI course pointer to the in-
bound rmway heading or the front
course in case of ILS precision ap-
proach.
Do
this even on back course
approach.
3.
Set the HDG SEL “bug” on the PNI to
!,he desired intercept angle and activate
HDG” mode.
4.
Depress the ”APPR“ button on the
mode controller.
The automatic APPR capture function
will be immediately armed. “APPRIARM” will
be
lighted on the Mode Annunciator Panel.
In APPRIARM mode, prior to capture,
HDG is retained
to
allow the pilot to adjust
heading to Approach Control vectoring in-
structions.
The LOC beam or VORIRNAV “capture“
point will vary, depending on angle of inter-
cept and rate of change of deviation indica-
tion. Upon capture, a bank command will be
introduced on the FCI, the existing headina
mode will be cancelled and ’APPRICPLD
will be lighted on the Annunciator Panel.
The pilot may manually bank the aircraft
to satisfy the command display, which will
command a rollout to wings level when the
aircraft is on course. Automatic crosswind
compensation will provide precise tracking.
VORILOC deviation is shown
on
the PNI, and
actual crab angle will be shown by offset of
the course arrow from the lubber line.
Throughout APPR,mode operation LOC
and Glideslope deviation or VORIRNAV de-
viation are displayed on the PNI.
If
the Autopilot is engaged during opera-
tion in the APPR mode, automatic steering
response will follow the command display on
the FCI.
The Glideslope mode is armed for au-
tomatic capture
if
LOC front course capture
has occurred. Automatic Glideslope capture
occurs as the aircraft approaches the glide
path from above or below.
Upon interception of the Glideslope,
capture occurs and
“GS
is lighted on the
Annunciator Panel. A smooth capture pitch
command
is
displayed by the Command
V-bar. The pilot (or Autopilot) controls the air-
craft
to
satisfy the Command V-bar. Slewin
ALT at time of GS centering will inhibit G8
capture.
Upon
GS capture, the ALT HOLD mode
(if active) is cancelled. However, ALT HOLD
may be manually reselected to maintain alti-
tude upon reaching MDA if visual contact is
r
m
NAV
ARM
AL
AP-
MOO
APh
CPLO
~
GS
CA
not established.
During VOR or RNAV approches, Glide-
slope capture will not occur because the NAV
receiver is channeled to a VOR station, not
an ILS, and this locks out the Glideslope
function.
APPRlCPLD mode is cancelled by selec-
tion of HDG, NAV. or Go-Around modes.
. .
or pushing FD or APPR
to
“OFF.”
NOTE:
For system limitations refer to your
Flight Manual Supplement.
31
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