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Honeywell !g!!gH#h
---
3.
B.
(7)
(9)
4
As
the
aircraft
rolls
to
a wings level attitude, the system
will automatically switch to the heading hold mode.
Heading
hold is defined as:
No lateral flight director mode selected.
Bank angle less than 3 degrees and 10 seconds.
When in HDG HOLD (refer to Figure 259, sheet 1), heading
information from the IRS is routed to the heading hold
reference synchronizer. When the system recognizes the
heading hold criteria as being true, the HDG HOLD switch
opens, locking the reference heading in the synchronizer.
Actual heading informatif
heading. Any difference
programmed and routed to
hold error signal is now
as previously described ~
Roll Hold Mode
The autopilot recognizes
operational when:
n is now compared to the reference
between the two is TAS gain
Figure 259, sheet 4.
The heading
routed to the aileron servo drive,
n paragraph 3.B.(7)(g)~.
the roll hold mode as being
No lateral fliaht director mode is selected.
The aircraft b~nk angle is greater than 6 degrees.
. Touch Control Steering (TCS) was used to initiate the
bank maneuver.
. Turn knob is not active.
The roll hold mode can be used by the pilot to maneuver the
aircraft into a bank and utilize the autopilot to hold the
bank angle.
With the roll hold criteria being met, roll attitude
information from the IRS is entered into the roll hold
reference block. With the ROLL HOLD switch activated to
the up position, desired roll attitude is compared against
actual roll attitude at the second summation point. Since
these signals are equal and opposite, no command is issued
to the aileron servo drive, and the autopilot maintains the
desired bank angle.
The roll hold reference block is a synchronizer that locks
its output as a function of releasing TCS with the
aircraft's bank angle greater than 6 degrees.
Should a
transient wind gust occur, the desired bank angle remains
unchanged, while the actual bank angle changes with aircraft
movement. The difference between the two becomes an error
signal routed to the aileron servo drive, as described in
paragraph 3.B.(7)(g)~, to fly the aircraft back to the
reference bank angle.
22-14-00
Page 298.99
Aug 15/91
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disclosure
Of Information
on
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IS
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to
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