787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Automatic Flight -
System Description
Copyright © The Boeing Company. See title page for details.
4.20.22 D615Z003-TBC
Automatic Flight Windshear Recovery
The AFDS provides windshear recovery guidance by means of the normal
go–around pitch and roll modes. Go–around is engaged by pushing a TO/GA
switch. The AFDS commands a pitch–up of 15º or slightly below the pitch limit,
whichever is lower.
As rate of climb increases, the AFDS transitions from pitch to airspeed control.
The target airspeed is IAS/MACH window airspeed or current airspeed,
whichever is greater when TO/GA is engaged. If current airspeed remains above
the selected speed for 5 seconds, the selected airspeed is reset to current airspeed,
(to a maximum of the IAS/MACH window speed plus 25 knots).
Flight Envelope Protection
There are three forms of flight envelope protection in the autopilot:
• stall protection
• overspeed protection
• bank angle protection
An AUTOPILOT caution message and roll or pitch mode failures alert the pilot if
the envelope is exceeded, and the autopilot prevents further envelope violations.
(Refer to Primary Flight Control System Modes
in Chapter 9, Section 20, for
additional information.)
August 14, 2009
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