KLM MD-11 - FMS ILS Localizer Only

MD-11 Flight Crew Operations Manual
k
Automatic Flight -
Description and Operation
Auto.10.19
When the FMS VOR capture criteria are satisfied, the roll control window on the
FMA changes to VOR1 or VOR2 to indicate which VHF NAV receiver is selected
by the FMC. The AFS then captures and controls to the VOR radial in response to
steering commands from the selected FMC.
Over the VOR station, control is to the selected VOR course only and the FMA
will show VOR1 or VOR2 CRS.
The FMS steering command is limited to an optimum maximum bank angle which
also provides a stall speed and initial buffet bank angle limit. The FMS bank angle
limit is used by the FCC to provide bank angle limiting.
If VOR is not engaged and the VOR is requested (if aircraft within VOR capture
threshold), the FMS/AFS will momentarily cycle through the VOR ARMED
phase to verify the capture criteria. It will then annunciate VOR1 or VOR2 and
control to the selected VOR RADIAL.
The flight crew can select and manually track a VOR radial at any time. The FMS
will track a VOR radial only during FMS VOR approach mode. This mode is
inhibited as follows:
• On the ground.
• In the land mode.
• In AP roll TO/GA modes below 400 ft.
• Above 18,000 feet. In this case, the FMS tracks FMS-calculated great
circle routes between waypoints.
Engaging another lateral control mode cancels the VOR approach mode. The
VOR approach mode may also be disengaged by the FMS or may be deselected
on the MCDU by clearing the selected course (radial to the station) or selecting
another VOR frequency.
FMS ILS Localizer Only
ILS localizer control with disabled glideslope control is provided.
The mode is requested from the NAV radio page on the MCDU by entering the
ILS frequency and runway heading and selecting the LOC ONLY prompt.
Upon receiving the LOC ONLY mode request, the AFS is armed to capture the
localizer. LOC ARMED is annunciated on the FMA.
LOC ARMED is reset by:
• Pushing the HDG/TRK select knob on the FCP to select the existing
heading.
• Selecting APPR/LAND.
• Selecting NAV.
• Selecting the optional VOR mode.
October 02, 2006