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Moving the PITCH wheel changes the reference pitch
attitude in proportion to the movement of the wheel. When
the autopilot is coupled to the glideslope, moving the PITCH
wheel has no effect.
TURN KNOB
Provides bank commands to the autopilot proportional to
knob displacement. When rotated out of detent, the lateral
mode selected on the flight director is cancelled
automatically. When returned to the detent position, a
lateral mode can be reselected. The autopilot can not be
engaged if the TURN knob is out of detent.
SOFT RIDE SWITCH/LIGHT
When pressed, lowers autopilot system gains
for operation in turbulence and green ON
light comes on.
fW5SCENDNcO^\RlDE
AP ENGAGE SWITCH/LIGHT
When pressed, the autopilot is engaged and
green AP ENGAGE light comes on.
YD ENGAGE SWITCH/LIGHT
When pressed, the yaw clamper is engaged and
green YD ENGAGE light comes on. The yaw
damper engages automatically when the
autopilot is engaged.
Autopilot Controller
Figure 15
SECTION 4
Page 40
Oct 03/83
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OPERATING MANUAL
(5) Couple
Either the pilot"s or copilot's flight director computers can couple
to the autopilot, providing path control and mode selection from
either side of the flight compartment. The COUPLE switch/light on the
AP controller selects and indicates which flight director is driving
the autopilot. The COUPLE switch/light has a split legend (1 or 2)
which sequences with each actuation of the switch/light, when the
autopilot is disengaged or a TCS button is pressed.
(6) Soft Ride
Soft ride is selected on the AP controller. Soft ride provides
lowered autopilot system gains for operation in turbulence.
10. FAILURE MONITORING AND STATUS ANNUNCIATION
When a failure occurs in either of the dual servo axes (pitch and roll), and
the monitor localizes the failure to a specific channel, a brake is applied to
the affected axis. This results in automatic reversion to single channel
operation in that axis only and annunciation on the autopilot status panel.
The other axis continues to operate in the fail/passive dual channel
configuration. Since the failed channel is no longer fail/passive, a torque
limiter is activated for hardover protection.
A. Failure Warnings (Figure 16)
Failure annunciations (aural and/or visual) are presented immediately to
alert the pilot that a failure has occurred.
(1) A flashing red A/P FAIL light (located on the instrument panel) comes
on when the monitor detects a failed mode which requires the pilot to
disconnect the autopilot.
The light goes out when the autopilot is disengaged. The warning
occurs when either of the following conditions exists:
- A failure is detected but no brake is applied
- A failure is detected, the appropriate brake is applied, but the
single-channel torque limiter fails to engage
(2) An amber A/P FAIL light comes on when the monitor detects a failure
condition which is isolated to a channel. The amber light may be
reset by momentarily pressing the light. Disengagement of the
autopilot is not required since the failed channel is automatically
disabled.
SECTION 4
Page 41
Oct 03/83
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OPERATING MANUAL
A/P FAIL SWITCH/LIGHT
Amber A/P FAIL light comes on when a failure is
detected which does not require the autopilot to be
disconnected. The light is reset by pressing the
switch/light.
AFCS LIGHT
Red AFCS light:
Comes on for one second to wx*c*te • pttot selected
autopilot disengagement.
Flashes for a non-localized yaw dampe* t»#ur» o* marfunction.
Is continuously on for an automatic *utop«*oT doconnect
(not pilot selected).
A/P FAIL
A/P FAIL
A/P FAIL LIGHT
Red A/P FAIL light flashes when a failure is
detected which requires the autopilot to be
disconnected. The light goes out when the
autopilot is disconnected.
Warning and Disengage Lights
Figure 16
SECTION 4
Page 42
Oct 03/83
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OPERATING MANUAL
(3) To facilitate rapid assessment of the situation, additional
annunciations are presented on the autopilot status panel (refer to
Figure 17). There are four autopilot status switch/lights located on
the autopilot status panel. The switch/lights are identified as
follows:
- ROLL 1 OFF
- ROLL 2 OFF
- PITCH 1 OFF
- PITCH 2 OFF
When one of the pitch or roll channels fails and the failed channel is
braked and the other channel is torque-limited, the appropriate
switch/light comes on (amber) to indicate which channel is disabled.
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