CYCLIC FORCE TRIM FAILURE
Cyclic force trim failure is a disconnection of the longitudinal and/or lateral
clutches. The failure is usually joined to the caution ATT OFF and the
cyclic moves freely in pitch and/or roll axis with loss of function of the cyclic
trim release (FTR switch) and cyclic beep trim system.
In these conditions the cyclic must be used hands-on to prevent it from
moving away the selected position.
AFCS QUICK DISCONNECT PROCEDURE
For situations where faults are suspected in the AFCS, but with no CAS
cautions illuminated, and the AP functions need to be disengaged, all AP/
AFCS functions can be disconnected by pressing the SAS REL button on
the cyclic grip.
4-AXIS FLIGHT DIRECTOR – GENERAL
The dual Flight Directors (FD1 & FD2) provide lateral and vertical guidance
commands that are normally coupled to the Autopilots for automatic flight
path control.
The 4 Axis (3 cue) Basic FD provides lateral modes operating on the roll axis
and vertical modes operating on the pitch and collective axes.
The 4 Axis Enhanced Flight Director provides all the functions of the 4 Axis
Basic Flight Director plus the Auto Hover/Velocity Hold mode (HOV).
References:
• 4 Axis Basic FD: ............................................. RFM Supplement 40
• 4 Axis Enhanced FD:....................................... RFM Supplement 34
• 4-Axis Enhanced with SAR modes (Phase 5):
........................................................................ RFM Supplement 69
The 4 Axis Enhanced FD requires the following optional equipment to be
installed in place or in addition to the Basic FD:
• AHRU LCR-93 or LCR-100 (in place of LCR-92) to provide AFCS with
hybrid GPS/Inertial Along-Heading and Across-Heading velocities and
accelerations (in addition to LCR-92 data)
• 5-way cyclic BEEP TRIM switches (in place of 4-way switches)
FD MASTER
At power up one of the two FD is automatically selected and configured as
Master (priority). At every power up the FD selected as Master is alternated:
the selection is not visible to the pilot.
PFD SELECTION (PILOT-IN-COMMAND)
Both FD1 and FD2 use the navigation source and data reference presented
on the selected PFD.
PFD selection (which typically matches the “Pilot Flying” or “Pilot in
Command” determination) is controlled by the PFD pushbutton on the
Guidance Controller.
The selected PFD is indicated by the PFD couple arrow in the center of the
top line of both PFD’s and by either the LH or the RH arrow-shaped LED
annunciator aside the PFD pushbutton on the Guidance Controller.
Whenever the PFD pushbutton is pressed to toggle LH/RH PFD selection all
FD modes are disengaged (STBY illuminates on the Guidance Controller).
FD modes remain engaged in case the selected PFD fails: the paired MFD
reverting in Composite format keeps operating as the selected PFD.