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Emergency power to operate the APU is from the battery
bus through the APU CONT EMERG circuit breaker on
the No. 1 PDP.
2-12-4. APU ON Caution.
The APU ON caution capsule is on the mater caution
panel (fig. 2-14-5 and 2-14-6). Normally, the APU is intended
for ground operation only. It is not intended for
operation during flight. If the caution remains illuminated
following take-off, it alerts the pilot to shut down the APU.
When the caution is illuminated it indicates the APU is up
to speed and the exhaust gas temperature is normal. It
does not necessarily indicate that APU hydraulic pump
or generator output is normal. If rotors are not turning,
check the UTIL HYD SYS and RECT OFF cautions to
evaluate output of the APU hydraulic pump and generator.
The APU ON caution is controlled by the ESU.
2-12-5. Emergency APU Fluid Shut Off Vavle.
The EMERGENCY APU FLUID SHUT OFF VALVE is in
the fuel supply line to the APU (fig. 2-12-1). It is located
inside the aft cabin above and to the left of the ramp
interphone station. The valve can also be reached from
the outside through an access door labeled ACCESS
APU EMER FLUID SHUT OFF. The knob on the valve
has an OPEN and CLOSE position. Placing the knob to
CLOSE shuts off fuel to the APU.
Figure 2-12-1. Emergency APU Fluid Shut OFF
Valve
TM 1-1520-240-10
2-12-2
Figure 2-12-2. Auxiliary Power Unit
TM 1-1520-240-10
2-13-1
SECTION XIII. LIGHTING
2-13-1. Position Lights.
Three position lights (1, 4, and 6, fig. 2-13-1) are installed
on the helicopter. On the right side of the fuselage is a
green light (1); on the left, red (6); and on the vertical
panel of the aft pylon, white (4). Power to operate the
position lights is supplied by the No. 2 DC bus through the
LIGHTING POS circuit breaker on the No. 2 PDP.
2-13-2. Position Light Switches.
a. POSN Light Switch. The POSN (position)
switches located on the EXT LTG (exterior lighting) panel
on the left side of the overhead switch panel (fig. 2-1-10).
The three position switch is labeled DIM, OFF, and BRT.
It adjusts the intensity of the position lights. When the
switch is OFF, the position light system is deenergized.
NOTE
The crew chief must inform the pilot when the
AFT POS LIGHT switch has been changed to
the OFF position.
b. AFT POS LIGHT Switch. The AFT POS LIGHT
switch is located in the cabin at sta. 534 near the MAINTENANCE
PANEL (fig. 2-13-4). The guarded two-position
switch is labeled OFF and ON. It allows the aft position
light to be turned off during aided (NVG) operations
and on during unaided night operations.
2-13-3. Formation Lights.
There are five electroluminescent panels for normal
night formation operations (2 and 5, fig. 2-13-1) and eight
NVG compatible formation lights for NVG formation operations
(9, fig. 2-13-1)
Figure 2-13-1. Exterior Lights
TM 1-1520-240-10
2-13-2
a. Electroluminescent Panel. Three panels which
form an equilateral triangle are aft of the forward pylon.
Two panels are on top of the aft pylon aft of the anticollision
light. Power to operate and control the electroluminescent
formation lights is supplied by the LIGHTING
FORM circuit breaker on the No. 1 PDP.
b. NVG Formation Lights. There is an NVG formation
light on each side of the forward pylon, two NVG
formation lights on each side of the fuselage, two NVG
formation lights on the aft pylon, one aft of the anticollision
light, and one on the vertical panel at the rear of the
aft pylon. Power to operate and control the NVG formation
lights is supplied by the No. 1 DC bus through the
LIGHTING NVG FORM circuit breaker on the No. 1 PDP.
2-13-4. FORM Light Switches.
The FORM (formation) light select and control switches
are located on the EXT LTG panel on the left side of the
overhead switch panel (fig. 2-1-10).
a. FORM Light Select Switch. A two-position toggle
switch labeled NVG and NORM. In the NORM position,
the five electroluminescent panels may be controlled by
the FORM light rotary control switch for normal night
formation operations. In the NVG position, the eight NVG
formation lights may be controlled by the FORM light
rotary control switch for the NVG night formation operation.
b. FORM Light Control Switch. A rotary control
switch labeled OFF, DIM, and BRT with three evenly
spaced incremental markings between DIM and BRT. It
adjusts the intensity of the formation lights selected by
the FORM light select switch. When the rotary control
switch is OFF, the formation light system is deenergized.
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