Honeywell SPZ-8000 Pilot's Manual page 137

SPZ--8000 Digital Integrated Flight Control System
AP (Autopilot) and YD (Yaw Damper) Button -- The AP button
D
engages autopilot and yaw damper functions simultaneously, but it
only disengages the autopilot functions. The YD button engages the
yaw damper only, and disengages the yaw damper and autopilot
functions. The active channel is annunciated by the lighted pointers
located on either side of the AP and YD buttons. When the autopilot
and yaw damper systems are in a normal no--failure condition, the
pilot channel is automatically selected as the active channel and the
left pointers are lit on the AP and YD engage switches. The R AFCS
or L AFCS buttons can be used to select the active channel. To
select the copilot channel as the active channel, push the R AFCS
button on the advisory display. When the right channel is engaged,
the right pointers are lit on the AP and YD switches to indicate that
the right channel is active.
M TRIM (Mach Trim) Button -- The M TRIM button selects the
D
Mach trim function. Once selected, the Mach trim function then
stays active until it is deselected. If the autopilot is engaged, the
Mach trim function is active but it does not control the pitch axis of
the aircraft. If previously selected ON, the Mach trim controls the
pitch axis when the autopilot disengages. Toggling the M TRIM
button deselects and reselects the Mach trim function.
CPL (Couple) Button -- The CPL button alternately selects either
D
the pilot's or copilot's EHSI and DADC data for lateral and vertical
guidance to both flight guidance computers. At power--up, the pilot's
EHSI and DADC are selected. When the system is transferred to
the alternate side, all flight director modes are cancelled. Operating
modes must be selected again. The pointer on the right or left side
of the CPL button is lit to indicate which EHSI and DADC has been
selected.
During an ILS approach, the system automatically selects both the
pilot's and copilot's EHSI and DADC data, and both CPL
switch pointers are lit. If one ILS receiver fails, the system
automatically selects the data from the remaining receiver.
Automatic Flight Control System (AFCS)
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