TM 1-1510-218-10
3C-149
Figure 3C-97. Final Approach Vectoring
The final approach course will be displayed on
the HSI and CDU. The FMS will provide lateral
guidance to directly intercept the final approach
course and vertical guidance to intercept the final
approach glideslope into the FAF waypoint. To
follow the radar vectors, activate the FMS heading
mode by pressing the HDG knob on the flight
instrument control panel. The FMS will then provide
guidance to continually capture the selected heading
from the flight instruments until the final approach
course has been captured.
The FMS roll command will guide the aircraft
to acquire and hold the displayed heading and any
subsequent desired heading entered by the pilot on
the FDS control panel. The FMS heading mode will
continue to guide to the FDS selected heading as
long as the heading is steering away from the flight
plan course. When the selected heading is steering
towards the flight plan course, the FMS heading
mode will automatically cease when the course can
be captured by normal FMS lateral guidance.
(13) When FAF or MAP waypoint is the
active waypoint and approach mode is active, the
pilot may disable the approach either by pressing
the go–around switch on the aircraft control yoke or
perform a direct–to another waypoint other than the
MAP. When disabled by go–around, the FMS flight
mode will switch to TERMINAL mode scaling, but
lateral guidance will continue to be provided through
the MAP waypoint. Vertical guidance advisories on the
CDU will be terminated when the approach is disabled.
To re-enable the approach, select direct–to the FAF or
any other flight plan waypoint that would place the FAF
as a future flight plan waypoint.
If the Navigation Flag on the flight instruments is
displayed (red FMS annunciation), and the RAIM
warning, NO GPS APPR, or annunciations are active,
disable the GPS approach and go–around for another
approach. The RAIM Warning annunciation on the flight
instruments indicates that the GPS solution is possibly
false due to satellite system failures. The NO GPS
APPR annunciation indicates there is not a satisfactory
GPS solution being provided to execute the GPS
approach. The NO APPR RAIM annunciation indicates
that the GPS receiver is unable to determine the
suitability of the satellite constellation during the
approach phase of the flight.
If a missed approach is executed, either perform a
direct–to the missed approach holding fix and fly the
published holding pattern or select Direct–To the IAF or
FAF (in history) and be vectored for another approach.
When the MAP is the active waypoint, pressing the CRS
select knob on the EFIS display control panel will
perform a direct–to the missed approach holding point
rather than the MAP.
