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start solenoid valve to allow hydraulic pressure
to turn the starter, and shut off the SDC inlet
throttle valve to unload the SDC for an APU start. The
APU ON caution light on the pilot caution/warning
panel illuminates when the APU is operating.
2.48.4 APU Controller. The APU controller provides
for automatic start and operation of the APU and power
take-offclutch (PTO) engagement. The controller monitors
the APU for loss of thermocouple, overtemperature,
overspeed, overcurrent, low oil pressure, percent
rpm, and exhaust gas temperature. The APU controller
transmits a shutdown signal to the APU whenever the
APU control panel switch is set to OFF. The controller
also transmits the shutdown signal automatically for
fault detection of any of the monitored functions. The
APU FAIL caution light on the pilot caution/ warning
panel is illuminated by the low oil pressure switch
when automatic shutdown occurs. The PTO clutch actuation
is also controlled by the APU controller. Normally,
PTO clutch engagement occurs at 60% APU
speed if the main rotor is below 90% speed; however, if
the main rotor is above 90% speed, it will engage at 95%
APU speed. For cold weather starts below 0° F (-18° C),
PTO clutch engagement is at 95% APU speed using a
cold start switch on the APU control panel.
2.48.5 APU Control Panel. The APU control panel
(fig 2-41), on the pilot right console, has the following
three distinct functions:
a. APU Control Switch. A three-position APU
control switch allows the pilot to START, RUN, and
shut down (OFF) the APU. This switch is spring-loaded
from the START to RUN position. Pilot pressure at the
START position is required for only one or two seconds
to ensure electrical circuit latching.
Do not use APU 95% cold start switch
when the ambient temperature is
above 0° F C-18° C). Use of this switch
will reduce the power takeoff (PTO)
clutch life drastically, and could
cause premature failure of the clutch
duplex bearing/needle bearing as
well as main transmission accessory
gear case component failure.
2-72 Change 4
TM 1-1520-238-10
b. 95% Cold Start Switch. A spring-loaded 95%
switch allows the pilot to delay APU PTO clutch engagement
during APU starts at temperatures below 0
°F (-18 °C). Delaying PTO clutch engagement until the
APU is at 95% operating speed allows successful engagement
in a cold weather environment. The switch is
spring-loaded to the NORM position and must be held
in the 95% position when used. PTO clutch engagement
is inhibited until the switch is released and returned to
the NORM position. The switch is used with the APU
ON advisory light that indicates the APU is operating
at or above 95% speed.
c. APU Fire Warning and Extinguishing Control.
APU fire warning is provided by a warning light
in the FIRE APU PULL handle and a FIRE APU
warning light on the pilot and CPG MASTER CAUTION
panels. Section II of this chapter describes emergency
equipment operation. An APU fire can be extinguished
by pulling the pilot FIRE APU PULL handle
and placing the FIRE BTL selector switch either to
PRI (primary) or RES (reserve). The fire test portion of
the panel is discussed in detail in Section II of this
chapter.
M01-319
Figure 2-41. APU Control Panel
2-73
TM 1-1520-238-10
Section XIII. LIGHTING
2.49 LIGHTING EQUIPMENT.
The lighting equipment consists ofexterior and interior
lighting systems. The lighting equipment is controlled
by the pilot and CPG lighting control panels (fig 2-42).
PILOT
CPG M01-022
Figure 2-42. Pilot and CPG Lighting Control
Panels
NOTE
The searchlight, crew station floodlights,
and utility lights are the only lights available
with battery power.
2.49.1 Exterior Lighting System. The aircraft exterior
lighting system consists off formation lights, navigation
lights, anticollision lights, a searchlight, and an inspection
maintenance light.
a. Formation Lights. The formation lights (green)
are located on the upper surface of each wing, the upper
centerline of the aft fuselage, and on the upper surface
of the vertical stabilizer. Power for operation of the
lights is 115 vac provided by the FORM circuit breaker
on the pilot overhead circuit breaker panel (fig 2-39).
Operation of the lights is controlled by the FORM
rotary control on the pilot EXT LT panel.
b. Navigation Lights. The navigation lights are
located on the wingtips (right side green, left side red,
and the aft white) and on the top aft side of the vertical
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