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cyclic to approximately the neutral position and pull 10, fig 2-16) to allow repositioning of the cyclic or
upward on CYC STK ENGAGE latch. Verify control antitorque controls to a new reference point. The
movements can be noted through both cyclic controls. system is protected by a FORCE TRIM circuit breaker
and is powered by the battery emergency bus.
The cyclic grips (fig. 2-15 and 2-16) are located at top
of each cyclic.
2 - 3 6 . S T A B I L I T Y A N D C O N T R O L
2-33. COLLECTIVE CONTROL SYSTEM. AUGMENTATION SYSTEM (SCAS).
The SCAS is a three-axis (pitch, roll and yaw) flight
WARNING control augmentation system with a heading hold mode
(HHM). This limited authority, rate reference system
improves handling qualities by damping the high
To ensure f u l l throttle travel when frequency, short term external inputs to the helicopter
installing CPG collective, alignment while providing the desired response characteristics for
notch on collective must be aligned with pilot inputs. The heading hold mode operates in
alignment boss in elbow assembly before conjunction with the yaw SCAS system as an aid to
t i g h t e n i n g knurled n u t . I n c o r r e c t maintaining a desired heading.
installation or misalignment will cause an
NR and NP droop. All yaw channels must be operational before heading
hold can be engaged.
The collective control system is operated by a
collective, located to the left of each crewmember seat, Upon failure of a system, a CAUTION message − P/R
and is the primary control for lift. A rotating grip type DISENG, YAW DISENG, or SCAS DISENG − will be
throttle and a collective control head are located at the displayed and accompanied by an audio tone. The P/R
forward end of the pilot collective (fig. 2-18). The CPG DISENG caution indicates that the pitch axis and/or roll
2-33
TM 1-1520-248-10
Figure 2-15. Pilot Cyclic Controls and Grip
2-34
TM 1-1520-248-10
Figure 2-16. CPG Cyclic Controls and Grip
2-35
TM 1-1520-248-10
Figure 2-17. Stability and Control Augmentation
System (SCAS) Control Panel
axis has failed and disengaged. The YAW DISENG
caution indicates that the yaw axis of the SCAS system
has failed and disengaged. SCAS DISENG indicates
that the entire SCAS system is inoperative. In addition
to the caution messages, an advisory message ONE
YAW CHAN OFF will be displayed in the event the yaw
SCAS system experiences a partial failure. SCAS
failure will result in increased pilot workload in the
affected channel(s). Upon failure, the failed systems
actuator will center and lock to prevent the introduction
of erroneous inputs into that channel. The failure
protection logic includes a preflight function which
validates the SCAS system and isolates faults within
the system.
a. Control Panel. The SCAS portion of the control
panel (fig. 2-17) includes ENGAGE switches for PITCH/
ROLL and YAW channels, a PWR switch, and a TEST
switch. The PITCH/ROLL and YAW ENGAGE switches
apply power to the respective channels when the PWR
switch is in the PWR (up) position.
b. SCAS Release Switch. A SCAS REL switch (9,
fig. 2-15 and 2-16) is installed in each cyclic control
grip. This switch is used to disengage pitch, roll, and
1 2 3
4
5
6
7
8
9
10
11
KYB
D
OFF
RMT ICS
CHAN UP
START
ON
ON
OFF
EXT
RET
L R
1 2
4 3
DN
RPM
ENGA
L R
C
A
RG
O
REL
IDLE
REL
FREQ
5
SR
C
HL
T
DISENG
LASER
SWITCH
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
406075-6
J0863
1
12
1
NOTE
R RMT ICS switch removed.
NVG
Communication RMT ICS switch
START switch
Searchlight power switch
Searchlight control switch
SCAS heading hold ENGA DISENG trim switch
Throttle
IDLE REL switch
RPM trim switch
Radio select switch
CHAN select switch
CARGO REL (electrical) switch
AIM-1 LASER switch
yaw with heading hold mode simultaneously. The
system can be re-engaged by the PITCH/ROLL and Figure 2-18. Pilot Collective Control Head
YAW ENGAGE switches.
2-36
TM 1-1520-248-10
c . SCAS Heading Hold ENGA DISENG Trim usable center-of-gravity range. Provisions have been
Switch. A SCAS heading hold ENGA DISENG trim added to allow the horizontal stabilizer to be folded for
switch (5, fig. 2-18) is located on the pilot collective easier storage and transportability.
　
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