CESSNA
MODEL 172S
. SECTION 9 - SUPPLEMENTS
SUPPLEMENT
19 - FAA APPROVED
SECTION 4
NORMAL PROCEDURES
OPERATION
Normal operating procedures
are outliri,ed in the KLN 94 GPS
Pilot's Guide, PIN 006'18207-0000,
dated September 2000 (or later
applicable
revision).
A KLN 94 Quick Reference,
PIN 006-18228-
0000, dated August 2000 (or later applicable revision) containing an
approach sequence, operating tips and approach related messages
is intended as well for cockpit use by the pilot familiar with KLN 94
, operations when conducting instrument approaches.
'
AUTOPILOT COUPLED OPERATION
The KLN. 94 may be coupled to the KAP 140 autopilot when
I
engaged in NAV mode by selecting
GPS
on the NAV/GPS switch.
Manual selection of the desired course on the NO. 1 OSS or HSI
course pointer is required to provide course datum to the KAP 140
autopilot
(Frequent
course datum changes
may be necessary,
such as in the case of flying a DME arc.)
The autopilot approach
mode (APR) should
be used when
conducting
a coupled
GPS
approach.
NOTE
NAV or APR coupled DME arc intercepts can result
in excessive overshoots '(aggravated by high ground
speeds and/or intercepts from inside the arc).
At
172S
serial
number
172S9423
and
On,
Roll
Steering
functionality
enables the GPS navigation
computer
to control the
autopilot, and automatically
perform
course
changes
(turns) and
intercept
the course to the next active waypoint
(when GPS is
selected as the autopilot navigation source).
The GPS navigation
computer uses ground speed, track and turn rate data to calculate
the required bank angle for waypoint
course changes.
The GPS
Roll
Steering
output
will
command
the
autopilot
to
turn
and
intercept
the course to the new active waypoint
without
directly
overflying
the
immediate
waypoint
(except
designated
flyover
waypoints),
Distance from the waypoint for the GPS to initiate the
turn will vary with groundspeed,
etc., but will usually be within one
nautical mile of the waypoint
Sequencing to the next waypoint will
occur approximately at the midpoint of the turn (transition segment).
Revision 4
s19-151
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