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lateral SPADS, and pedal directional SPADS (fig 2-25)
from accidental breaking when the helicopter is on the
ground without hydraulic power. They consist of two rig
pins to prevent cyclic longitudinal and lateral movement
and two pedal lock fixtures to prevent pedal
movement, one set for the pilot station and one for the
CPG station.
The two sets, comprising four rig pins and four pedal
locks, are in a pouch located in the crew station. Each
rig pin and pedal lock are attached together by a lanyard
with a warning streamer.
When installing and removing the
control locks, hydraulic power must
be on the helicopter to prevent damage
to the SPAD shear pins.
One rig pin is installed in the left side of the cyclic stick
base to prevent longitudinal movement. The other rig
pin, to prevent lateral movement, is installed in the
lower right side of the cyclic stick shroud cover where it
has been cut away to allow access for rig pin installation.
After each pedal is moved forward, the pedal lock fixture
is installed through the brushes and cutout in the
floor so it rests on the edge of a shelf. The pedal lock fixture
is aligned so that when the pedal is moved aft, the
pedal support fits into the fork of the pedal lock fixture.
The pedal is then moved aft so the fork tightly engages
the pedal support to prevent movement and the pedal
adjust is tightened.
2-48 Change 4
TM 1-1520-238-10
2.37.8 Stabilator System. A variable angle of incidence
stabilator is installed to enhance helicopter handling
characteristics. The stabilator is designed so that
it will automatically be positioned by stabilator control
units. These units determine stabilator position from
airspeed, pitch rate, and collective stick position inputs.
Automatic stabilator range of travel is from 5 ° trailing
edge up through 25 ° trailing edge down. Manual control
is from 10 ° trailing edge up to 35 ° trailing edge
down. The stabilator is driven by two independent dc
motors. Stabilator operation, in either manual or automatic
mode, requires both ac and dc power supplies.
Associated crew station controls and indicators are as
follows:
a. Stabilator Circuit Breakers. The stabilator receives
115 vac from the No. 1 essential ac bus through
the STAB MAN AC and STAB AUTO AC circuit
breakers. It also receives 28 vdc from the No. 1 essential
dc bus through the STAB MAN DC circuit breaker
and from the No. 3 essential dc bus through the STAB
AUTO DC circuit breaker. These circuit breakers are
on the pilot overhead circuit breaker panel.
b. Stabilator Manual Control Switch. The stabilator
manual control switch is located on the stabilator
control panel (fig 2-26) installed inboard and forward of
the friction grip on each collective stick. The switch,
nose up (NU), and nose down (ND), permits crewmembers
to control the stabilator angle of incidence. The
manual mode will disengage both the normal auto and
NOE/APRCH modes below 80 KTAS. Selection of the
manual mode will cause the pilot and CPG MAN STAB
caution lights to illuminate. Transitioning above 80
KTAS in the manual mode will result in automatic
switchover to auto mode. Failure of the automatic
switchover to auto mode will result in the following:
(1) Pilot and CPG MASTER CAUTION light
starts flashing.
(2) Pilot and CPG caution/warning MAN STAB
light starts flashing.
(3) Stabilator aural tone is heard.
Below 80 KTAS automatic mode is regained after selection
of manual mode by momentarily pressing the automatic
operation/audio tone RESET button on either
collective stick.
C. NOE/APRCH Switch. The NOE/APRCH
switch, located on the ASE control panel (fig 2-27),
positions the stabilator at 25 degrees (trailing edge
down) below 80 KTAS. If auto mode is on, this mode is
selectable at any speed from a magnetically held
switch. Transitioning past 80 knots will result in normal
stabilator scheduling. Failure to revert to normal
stabilator scheduling will result in the following:
(1) NOE/APRCH switch goes to OFF.
(2) Pilot and CPG MASTER CAUTION light
starts flashing.
(3) Pilot and CPG caution/warning MAN STAB
light starts flashing.
(4) Stabilator aural tone comes on.
Regaining auto mode after the NOE/APRCH mode is
selected is accomplished by momentarily pressing the
automatic operation/audio tone RESET button on either
collective stick or setting the NOE/APRCH switch
to OFF Manual mode may be regained by selecting
manual mode with the NU/ND switch.
d. Stabilator Position Indicator. The STAB POS
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