Takeoff; Climb - Honeywell SPZ-8000 Maintenance Manual

Ambient temperature dictated engine limitations are determined
via the aspirated ambient air temperature probe only. Pilot
entry of static ambient temperature is not
used by the
autothrottle.
Descriptions of specific functional capability during
representative flight phases are given below:
4. C. (2) (b) Takeoff
When the autothrottle is engaged and takeoff is initiated
(requires cockpit input, minimum engine
power setting, and
satisfaction of enabling conditions), the throttles are
automatically advanced to the required takeoff engine setting
based on a full-thrust (MIN EPR) takeoff or a reduced-thrust
(FLEX EPR) takeoff. A FLEX EPR takeoff requires either an
operating performance function and a CDU selection by the pilot
during performance initialization, or a pilot input of engine
pressure ratio (EPR) command on the manual thrust reference
page of the display controller. At 60 knots the autothrottle
servos are depowered with the clutches remaining engaged
(throttle hold) and remain depowered until the aircraft has
climbed to at least 400 feet above lift-off altitude (see
Figure 264.1). An indication of the throttle hold condition is
displayed to the pilot. At 400 feet, the servos are repowered
after a positive pilot action (required) is made indicating a
transition from takeoff (or if the flight director captures the
selected altitude).
This action will be the selection of a
flight guidance computer
mode that causes the takeoff discrete
to be dropped.
(c) Climb
During the climb phase, the autothrottle mode is determined by
flight guidance computer operation. If the autothrottle is
engaged and the autopilot is either in vertical speed mode or
no mode is selected, the autothrottle adjusts thrust within
engine limits to control aircraft speed.
Engine
synchronization is provided in
speed hold
mode as a function of
cockpit inputs.
If the FGC is in flight level change mode, the autothrottle
increases thrust (limited to the selected engine rating) to
provide the aircraft with the energy required to accomplish the
FLC climb.
22-14-00
Page 298.175
Apr 15/93
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