4. C. (2) (d) Cruise
During cruise, the autothrottle adjusts thrust within the
limits of minimum thrust and the selected engine rating to
control aircraft speed.
(e) Descent
I)uring the descent, the autothrottle mode is determined by
flight guidance computer (FGC) and navigation computer
operation.
If the autothrottle is engaged and the FGC is in
vertical speed,
VNAV path, or no mode is selected, the
autothrottle adjusts thrust within the limits of minimum thrust
and the selected engine rating to control aircraft speed.
Engine synchronization in speed hold mode is provided as a
function of cockpit inputs.
If
the FGC is in flight level change mode, the autothrottle
decreases thrust as necessary to provide the autopilot with the
energy required to accomplish the FLC descent.
If the descent
is being made with vertical navigation (VNAV) guidance, minimum
thrust control is provided.
(f) Approach
When the FGC is in glideslope, path, or vertical speed mode
during approach, the autothrottle adjusts thrust to control
aircraft speed.
(g) Go-Around
When engaged and go-around is initiated (requires cockpit
input), the autothrottle automatically increases thrust to the
go-around engine limit.
22-14-00
Page 298.176
Aug 15/91
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