BendixKing KLN 94 - Pilots Guide - Manual (Page 179)

6.2.1. APPROACH MODE ANNUNCIATIONS
In addition to the two course modes (Leg and OBS) described in section
5.5, there are also two approach related modes. At the time of the
KLN 94 installation in the aircraft these two modes may be configured to
be annunciated as one of the following two ways:
APR ARM (approach arm)
APR ACTV (approach active)
OR
TERM (terminal)
APR (approach)
These annunciations are displayed on the right side annunciator section of
the KLN 94 display.
NOTE: Approach arm is exactly the same as terminal mode and
approach active is exactly the same as approach mode. In this pilot’s
guide APR ARM / APR ACTV will be used for consistency but your
KLN 94 may annunciate TERM / APR.
One difference of these modes from the normal en route mode is that the
CDI scale factor changes from ±5 NM for en route mode to ±1.0 NM for
APR ARM and to ±0.3 NM when in the APR ACTV mode. Another differ-
ence between these modes and the en route mode is that the GPS
integrity monitoring (RAIM) is set to a tighter level.
The APR ARM mode will be selected automatically by the KLN 94 when
the aircraft is within 30 NM of an airport and an approach is loaded in the
flight plan for that airport. The APR ACTV mode can only be engaged
automatically by the KLN 94 when 2 NM inbound to the final approach fix
(FAF).
NOTE: If an optional external GPS approach switch is installed it is possi-
ble to arm the approach mode at a distance greater than 30 NM from the
airport by pressing the external GPS approach switch, but the KLN 94 will
not change the CDI scale factor until the aircraft reaches the 30 NM point.
If the external GPS approach switch is pressed while the approach mode
is armed, then the KLN 94 will disarm the approach and change back to
en route mode. The approach can be re-armed by simply pressing the
GPS APR switch again. If the KLN 94 is in the APR ACTV mode, press-
ing the external GPS APR switch will change the mode to APR ARM.
Once past the FAF, it is not possible to return to the approach active
mode without conducting a missed approach and flying back to the FAF.
KLN 94 Pilot’s Guide Chapter 6 Approaches and DP/STARs
6-3