APPROACH (APPRIARM, APPRICPLD
and
GS
CPLD)
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 radials
Lateral and vertical deviation can be moni-
tored 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 runway heading or.the front course
in case of ILS precision approach Do this
even on back course approach
3.
Set the HDG SEL"bug" on the PNI
to
the
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 "APPR/ARM" will
be
11
hted on the Mode Annunciator Panel
fn APPR/ARM mode, prior
to
capture,
the heading select mode is retained in order
to
allow the pilot
to
adjust heading
to
Approach Control vectoring instructions
The LOC beam or VOR "capture" point
will vary, depending on angle of intercept
and rate of change of deviation indication
Upon capture, a bank command will be in-
troduced on the FCI, the existing heading
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
level flight when the
aircraft is on course Automatic crosswind
compensation will provide precise tracking
VOR/LOC 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 VOR deviation
are displayed in the PNI
If the Autopilot isengaged 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-
has occurred Automatic Glideslope capture
occurs as the aircraft passes through the
glide path from above or below
Upon interception of the Glideslope,
capture occurs and "GS CPLD" is lighted on
the Annunciator Panel A smooth capture
pitch command is displayed by the Com-
mand V-bar The pilot (or Autopilot) controls
the aircraft
to
satisfy the Command V-bar
Upon
GS
capture, the ALT HOLD mode
(if active) is cancelled. However, ALT HOLD
may be manually reselected
to
maintain
altitude upon reaching MDA if visual contact is
not
established
t
tomatic capture
if
LOC front course capture
L
P
During VOR or RNAV approaches,
Glideslope capture will not occur because
the NAV receiver is channeled
to
a VOR sta-
tion, not an ILS, and this locks out the Glide-
slope function.
APPR/CPLD mode is cancelled by
selection of HDG, NAV, or Go-Around modes
.
. .
or pushing FD or APPR
to
"Off".
CAUTION:
The APPR mode of operation will
continue
to
provide airplane control without a
valid VOR/LOC signal (NAV flag in view).
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