Autothrottle Flight Level Change Mode - Honeywell SPZ-8000 Maintenance Manual

4.
c.
(6) (b) ~ The autothrottl es are disengaged by:
. Moving either power lever mounted A/T ENG/DISENG switch
. Pressing either power lever mounted A/T disconnect switch
. Manually moving the
power
levers
. Deselecting A/T ARM button on the GP-820 Flight Guidance
Controller
Selecting the cross-side A/T via the DC
Deselecting the EPR limit rating on the DC
. LP (Nl) split of 20 percent
. Engine out (N2 < 41 percent)
Bleed air isolation valve open
. FGC 1 and 2 fail
. A/T fail
. An autothrottle limit mode will drop the correct
autothrottle mode but will not disconnect the
autothrottles.
(c) Autothrottl e F1ight Level Change, Speed (IAS/MACH), and
Go-Around Mode Select (Figure 269).
~ Autothrottle Flight Level Change Mode
This mode of the autothrottle is active whenever the flight
director is in a flight level change (FLCH) mode (IAS, MACH,
VIAS, VMACH). This mode is annunciated as FLCH, in green,
in the PFD autothrottle mode annunciation window. In this
mode, the autothrottle is setting power (a target) for the
climb or descent, which is normally full climb power or
idle, as appropriate. If the amount of climb is less than
6000 feet, at low altitudes, the autothrottle sets less than
full climb power. The amount of thrust provided is limited,
in all cases, by the EPR LIMIT rating value selected for
display on the engine EPR display.
To engage the mode:
A/T ARM is pressed on and A/T is engaged.
Press the FLCH button. If the performance computer has
been initialized, that speed target will automatically
appear as the FLCH speed target, otherwise a manual speed
set may be used.
A/T will provide the correct amount of thrust.
22-14-00
Page 298.195
Aug 15/91
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