stick trim valve is excited. The solenoid causes
Collective Channel
automatic repositioning of the cyclic stick, thereby
extending pitch channel authority.
After ASE is engaged, the pilot engages the
collective channel by the BAR ALT engage button
to stabilize helicopter altitude. Part of the
Roll Channel
altitude error signal goes to the collective coupler
integrator during BAR ALT operation. (See
Roll channel operation is similar to the pitch
figure 8-50.) If the altitude control error signal
channel. (See fig. 8-49.) In basic ASE, the position
is steady-state (due to variables such as fuel,
sensor is lagged by an amplifier before being
load, weather, etc.), a signal is developed
added to or subtracted from the rate-plus-
to compensate for this steady-state error and
displacement signal. In the Doppler mode, the
to improve engaged altitude retention. When
pilot input is the DRIFT control on the ASE
the pilot presses the BAR ALT REL button, the
integrator cancels any remaining compensating
control panel. Roll signals are otherwise processed
in the same manner as the pitch signals.
signal.
Figure 8-49.-ASE/coupler run channel.
8-48
