Autothrottle Mode Engagements; Mode Annunciation; Autothrottle Engage Logic - Honeywell SPZ-8000 Maintenance Manual

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4. c. (5) (e) Mode Annunciation
Autothrottle
modes are annunciated on the primary flight
display.
Basic operating
modes are displayed as either armed
(white) or captured (green). Several limits are also
annunciated. If the autothrottle is unable to achieve the
selected airspeed, it will annunciate the reason. For example,
the active window might show: VMO, MMO, FLAPS, GEAR, or POWER.
The first four indicate speed limiting for specific aircraft
configurations. POWER is shown when an engine limit is
preventing the autothrottle from reaching the desired speed.
(6) Autothrottle Mode Engagements
(a) Autothrottle Engage Logic (See Figures 266 and 267.)
Autothrottle controls are located on the GP-820 Flight Guidance
Controller and on each power lever.
Autothrottle (A/T ARM) Button - This pushbutton is located
on the GP-820 and is used to arm/disarm the engage/disengage
switches on the power levers. This button must be armed
before the A/T recognizes any activation from the throttle
mounted switches.
Autothrottle Engage/Disengage (A/T ENG/DISENG) Switches -
Each power lever handle has an A/T ENG/DISENG switch located
on the under side of the power lever handles (see Figure
266). When the A/T is armed, activation of either switch
will engage the A/T provided the engage criteria is met.
Autothrottle Quick Disconnect (A/T DISC) Switches - Each
power lever handle has an A/T DISC switch located on the
front of the power lever handle (see Figure 266). This
switch is used to disconnect the A/T and also cancels the
A/T OFF light.
22-14-00
Page 298.185
Aug 15/91
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