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TM 1-1520-248-10
CONTROL/INDICATOR FUNCTION
4. EMER COMM switch Places the FM, UHF, and VHF radios in the emergency frequencies of
40.5, 243.0, and 121.5 MHz respectively and transponder to code 7700
NORM.
NOTE
(CDS4) Activating EMER COMM switch has no effect on FM-1 and FM-2 radios.
Emergency mode for these radios is controlled using L-2 key on FM-1 or FM-2
SC control page.
5. Alpha keys Used to enter characters. Space keys are located at lower left and lower
right of MFK.
6. ENTER key Enters into memory of the computer any information that has been typed
on the MFK.
7. CLR key Clears any message that has been typed but not entered into memory.
8. Numeric keys Used to enter numeric characters. A decimal point is located under the
numeric key 9.
Figure 2-9. Multifunction Keyboard (Sheet 3 of 3)
2-20
TM 1-1520-248-10
PULL
MAN
PULL
BKUP
BRT
C
ONT
CONTROL/INDICATOR FUNCTION
1. Optosensors Two electronic sensors that measure the average ambient light at the display.
Any change in ambient light of 30 percent or more will result in an automatic
change in the display brightness.
2. Line address keys Ten variable function keys (five on either side of screen). The function of the
keys will vary with the change of modes and screen displays. These functions
are covered in detail under the operation sections of the different modes of
operation. Line address keys are identified as L-1  L-5 and R-1  R-5 from
top to bottom throughout text to simplify locating a specific key or legend
associated with it.
3. CONT/PULL MAN knob Turning the knob controls the contrast between the display and the background
of the screen. Pulling the knob out overrides the optosensors to give manual
control of the display brightness.
4. Mode select keys Four keys used for selecting the modes of VSD, HSD, MMS, or COMM or their
displayed submodes.
5. BRT/PULL BKUP knob Turning the knob controls the brightness of the background of the display.
Pulling the knob outward causes the display to repeat information displayed on
the opposite MFD.
Figure 2-10. Multifunction Display

2-21
TM 1-1520-248-10
SECTION II. EMERGENCY EQUIPMENT
2-17. EMERGENCY EQUIPMENT. b. First Aid Kit. A first aid kit is mounted on the
right side of the center support column, located behind
a. Portable Fire Extinguisher. A portable hand- the pilot seat. Refer to Chapter 9 for illustration of
held, chemical fire extinguisher is mounted on the left location.
side of the center support column, located behind the
CPG seat. Refer to Chapter 9 for illustration of location.
SECTION III. ENGINE AND RELATED SYSTEMS
2-18. ENGINE. drivetrain supplies the power output for the main
driveshaft (5), tail rotor drive (9), AC generator, and
The helicopter is equipped with an Allison turboshaft PMA (17). The gear case serves as the main
engine model T703-AD-700A (250-C30R) or 250-C30R/ structural support of the engine through two engine/
3 (fig. 2-11 and fig. 2-12). Four major components of airframe mounts on the sides of the case.
the engine are the compressor module, the combustion
module, the turbine module, and the power and
accessories gearbox. The four major systems are the 2-19. ENGINE COOLING.
engine fuel system, engine lubrication system, engine
The engine is cooled by air flowing through the engine
electrical system, and the engine anti-icing system. and the engine compartment cowling louvers. The
cowling louvers permit outside air to enter the engine
a. Compressor Module. The compressor module is compartment through both sides, top, and aft cowling.
a single stage, single entry, centrifugal flow compressor
and is directly coupled to a two stage gas producer
turbine. 2-20. INDUCTION SYSTEM.
b. Combustion Module. The single combustion
module consists of an outer combustion case, a WARNING
combustion liner, a fuel injector (11), and one igniter
plug (10).
Foreign debris is ejected under high
c. Turbine Module. The turbine module consists of pressure from purge blower ducting
a two stage gas producer turbine assembly, a two located at eye level directly above fuel
stage power turbine assembly, and an exhaust collector filler cap. Caution must be taken to avoid
support assembly. eye or face injury when engine is running
or power is applied to the system.
d. Power and Accessories Gearbox. The power
and accessories gearbox (3), consists of the gas The engine air induction system consists of an air
producer turbine drive geartrain and the power turbine induction cowl, two particle separator panels, and a fan
　
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