MD-11 Flight Crew Operations Manual
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Automatic Flight -
Description and Operation
Auto.10.31
Approach and Go-Around
When windshear is detected, the annunciations will appear on the PFD and FMA.
The precursor tone and voice warnings will sound through the CAWS. After
flashing 5 times, WINDSHEAR will appear in the FMA and the PFD speed bug
will indicate a minimum speed of 1.3Vs + 20 KTS. The ATS, if engaged, will
control to 1.3Vs + 20 KTS for both increasing and decreasing performance shears.
The ATS will not control to a speed below the pilot selected speed.
Guidance is not activated during approach unless the GA button is pushed, or the
throttles are advanced manually or automatically above 95% N1 GA thrust limit
after windshear is detected.
When guidance is activated, the FMA speed, roll, and altitude windows will show
changes in the WAGS mode. For a decreasing performance windshear, the system
will: limit bank to 5 degrees and display HDG XXX degrees in the speed and
altitude windows of the FMA (after flashing 5 times).
For increasing performance windshear, the roll window will retain the heading.
WINDSHEAR will be displayed in the speed and altitude windows after flashing
5 times.
ATS, if disengaged, will engage automatically and advance to maximum available
GA thrust. The FD, if off, will pop up automatically. Guidance continues until
windshear no longer exists and reversion (safe) conditions exist as noted
previously.
If windshear is detected after a GA has been initiated, the aural and visual
annunciations will be activated and guidance will begin automatically.
EGPWS and TCAS Inhibits
The EGPWS is inhibited during windshear guidance when FD commands are
being followed within + or - 5 degrees. The TCAS is also inhibited during
windshear guidance, except for traffic advisory (TA) annunciations on the ND.
Windshear System Modes
The pitch limit indicator (PLI) is in view for all modes. Detection failures are
annunciated on the EAD and CFDS.
STANDBY
• Detection - Inactive.
• Guidance - Disabled.
• Autothrottle - No action.
• Thrust limits - No action.
TAKEOFF - Nose oleo extend
• Detection -Active.
• Guidance - Armed. Will engage upon windshear detection.
October 02, 2006
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