SPD ILS LOC G/S
135 TRK TRK
Glideslope capture has been completed. Landing flaps selected and appropriate speed selected. Airplane is tracking localizer and glideslope.
6.
SPD AUT LOC G/S
135 G/A TRK TRK
This will be the display below 1500 feet R/A if auto go-around is available.
SPD FD LOC G/S
135 G/A TRK TRK
This will be the display if only flight director go-around is available.
SPD MAN LOC G/S
135 G/A TRK TRK
This will be the display if neither auto or flight director is available.
7.
SPD AUT LOC NO
135 G/A TRK FLR
If autopilot remains engaged at 100 feet R/A, NO FLR is flashed in pitch FMA.
8.
RETD LOC G/S
TRK TRK
If autothrottles remain engaged at 50 feet R/A, retard mode is initiated.
MD-80 Sec. 4 Page 139
Flight Manual Continental Rev. 01/01/00 #28
Autoland Mode FGS Operation
Note: Autoland to touchdown is not authorized on Continental MD-80’s.
General
The MD-80 has a fail-passive automatic landing system which provides aircraft control for approach and landing. The autoland functions include localizer capture, localizer track, glideslope capture, glideslope track, align, flare, retard, nose lowering, and ground rollout (on some aircraft). If a detected failure occurs, the autopilot will disconnect with appropriate warning lights indication and aural warning before the aircraft has significantly deviated from its flight path.
An autoland preflight test, which lasts about 55 seconds, must be run on any DFGC to be used for an autoland prior to that flight. If the NO AUTOLAND annunciator remains on after completion of the test, autoland with the respective DFGC is not available. The autoland preflight test must not be run simultaneously on two DFGC’s.
Note: On AHRS equipped aircraft, during the autoland preflight test the
AHRS system preflight test is conducted. This adds about 40
seconds to the test. A steady NO AUTOLAND message on the FMA’s is
normal during the AHRS preflight test, and does not indicate a failed
test unless it remains on after the AHRS test is complete, and the
AHRS have returned to the normal mode.
The performance of the system will vary with the quality of the ILS facility in use. Extra caution should be exercised during an approach to an unfamiliar facility. Aircraft in-flight or on the ground or ground vehicles moving or parked near the ILS runway can cause distortions of the localizer or glideslope signals. The pilot is the master monitor and progress should be continually assessed during the approach utilizing raw data and flight director displays.
Operational Description
The autoland function may be selected when the autopilot selector switch is in either position 1 or 2. Normally the autopilot selector switch should be set to the side of the pilot flying the approach (for a monitored approach this would be the First Officer’s side). However if the desired DFGC is inoperative or is annunciating NO AUTOLAND, the approach may be accomplished with the autopilot selector switch set to the opposite position.
To arm the autoland mode:
.
Set DFGC switch to position 1 or 2.
.
Engage autopilot, engage autothrottles, turn Flight Directors on
.
Select the localizer frequency on the respective VHF NAV control panel
.
Set the inbound runway heading in the respective CRS window
Note: If correct ILS/LOC inbound course has not been set, and a large discrepancy exists between the actual LOC inbound course and the selected course, the flight guidance system will not attempt to complete the course intercept; the airplane will fly through the localizer, wings level. In that case, LOC CAP may be annunciated and G/S TRK could occur, causing the airplane to begin to descend. Upon failing to attain LOC TRK and after exiting the localizer beam, the autopilot will disconnect and flight guidance will revert to HDG HLD/ VERT SPD.
.
Observe that the NO AUTOLAND light is off. Note: If the NO AUTOLAND light is on, move DFGC 1-2 switch to the opposite position and again observe the NO AUTOLAND light. If
the NO AUTOLAND light is off, continue autoland operation. If the NO AUTOLAND light is on, autoland operation is not possible.
.
Press the LAND mode select pushbutton Note: The second VHF NAV control panel must be set to the localizer frequency and runway CRS heading before the system will engage into the autoland mode. If the opposite VHF NAV is not
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