Each flight guidance computer receives manual trim inputs
directly from the pilot’s and copilot’s manual electric trim
switches (located on control yokes). Since these are split
actuated trim switches (each is dual) the flight guidance
computer brings in a total of four analog discretes as
follows:
. Pilot’s trim up (switch 1)
. Pilot’s trim down (switch 1)
● Copilot’s trim up (switch 1)
● Copilot’s trim down (switch 1)
Each channel of the GP-820 Flight Guidance Controller shall
receive four analog input discretes as follows:
. Pilot’s trim up (switch 2)
. Pilot’s trim down (switch 2)
● Copilot’s trim up (switch 2)
● Copilot’s trim down (switch 2)
These inputs received by the flight guidance controller are
transmitted via private-line serial data link to the flight
guidance computer.
Any one of the above pairs, if active together (and’ed
logic), activate the manual electric trim in the direction
selected.
If any two and’ed switch pairs are on at once calling for
trim in opposite directions, the electric trim will not
drive.
The DAFCS monitors the pilot’s and copilot’s trim
switch pairs for disagreements and provides individual trim
switch caution flags via ASCB to the EDS system for crew
alerting.
The electric trim rate is gain programmed (as a function of
true airspeed).
This data shall be received via ASCB from
the DADCS.
This trim rate programming is a factor when the
autopilot is engaged (autotrim) and when the manual electric
trim is activated via the pilot or copilot trim switches.
This rate programming is not to be used for Mach trim rate
control.
When voted DADC data is not valid, the electric
trim defaults to the high trim rate.
3. B. (8) (j) ~ Mach Trim Mode -
The Mach trim mode is active above 0.7 Mach
whenever the electric trim is engaged with the autopilot
disengaged and the manual mode inactive (i.e., no pilot trim
inputs).
The Mach trim mode trims the aircraft noseup for
increasing Mach number and trims the aircraft nosedown for
decreasing Mach number. This control only applies in the
speed range between 0.838 Mach and 0.95 Mach and results in
22-14-00
Page 298.125
Aug 15/91
Use or disclosure of mformatlon on this page is subject to the restrictions on the title page of this document.
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