4. C. (6) (e) A/T
The
(7)
Limit Mode Operation
autothrottle is Drocwammed to t)rotectsr)eedand thrust
1 imits during the va~iofis phases of flight.“ As speed
approaches the appropriate limit, the A/T active mode, shown on
the PFD, is turned white and moved to the arm side of theA/T
annunciation window.
The appropriate limit is annunciated in
green on the PFD.
The limits protected by the A/T are
below with the mode annunciation:
Limit Annunciation
Landing Gear Operating Speed
(VL~MLO)
GEAR
Flaps Extended Speed
(vFE/MFE)
FLAPS
Power (selected EPR) Limited POWER
Maximum Operating Limit Speed
(V~~MMO)
VMO or MMO
shown
When the autothrottle performance limiting factor is corrected,
the previously active mode will be restored in green on the
PFD. All mode transitions are shown
boxed for 5 seconds.
A/T Priority Description
The autothrottle system uses two identical performance computers.
Only one computer is active at any one time. The pilot can manually
select A/T 1 or A/T 2 through the display controller sensor page.
This selection can be made on either the pilot or copilot display
controller (both controllers always show the same A/T selection).
Full system performance capabilities are provided independent of
which A/T is active (i.e., there is no operational advantage in the
pilot manually selectingA/T 2 insteadofA/T 1). The system will
power-up with A/T 1 selected. Since the autothrottle system is fail
passive, failure of the active A/T performance computer or selection
of the other A/T performance computer via the DC will result in an
A/T disconnect.
22-14-00
Page 298~201
Aug 15/91
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