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Door locking devices and an ignition keylock switch are padlock. The hasp is riveted to the door post and the
installed to prevent unauthorized use of the helicopter. padlock is inserted in the hasp.
a. Left Crew Door Locking Devices. The left crew c. Ignition Switch. An ignition switch is installed in
door is secured with a locking strap. The strap is the pedestal. When the switch is in the OFF position
fastened to the door frame at one end, looped through the starter circuit cannot be energized. In the ON
the door handle, then secured back to the door frame. position the switch allows normal operation of the
This immobilizes the door handles and latching starter circuit.
devices.
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TM 1-1520-248-10
CHAPTER 3
AVIONICS
SECTION I. GENERAL
3-1. GENERAL. 3 - 2 . A V I O N I C S E Q U I P M E N T
CONFIGURATION.
a. This chapter covers the avionics equipment Refer to table 3-1, Avionics Equipment Configuration,
configuration. It includes a description of the avionics for an avionics systems list.
equipment, its technical characteristics, capabilities,
and locations. For detailed information on the MFK and 3-3. POWER SOURCE. MFD, refer to Chapter 2, Section I. For mission
avionics equipment, refer to Chapter 4, Mission Refer to Chapter 2, Section XI, Electrical Power Supply
Equipment. and Distribution System, for electrical power source
information for each avionic component.
b. Due to the operational connections among many
of the avionics systems, some components are covered
under more than one heading. To understand the
complete operation of these systems, it is necessary to
understand this complete chapter as well as related
data in Chapters 2 and 4.
TABLE 3-1. AVIONICS EQUIPMENT CONFIGURATION
NOMENCLATURE USE RANGE
1. Communication System Interphone for pilot and CPG, integrates all Stations within
Control (CSC) C-11746/ communication equipment, controls volume helicopter.
ARC of all radios.
2. VHF-FM Radio Set  AN/ Two-way voice communication in Line of sight.
ARC-186 (FM-1) frequency range of 30.000 to 87.975 MHz.
3. UHF-AM Radio Set  Two-way voice communication in Line of sight.
HAVE QUICK AN/ARC-164 frequency range of 225.000 to 399.975
(UHF) MHz.
4. VHF-AM Radio Set  AN/ Two-way voice communication in Line of sight.
ARC-186 (VHF) frequency range of 116.000 to 151.975
MHz.
5. HF Radio Set  AN/ARC- Two-way voice communication in Varies with ionospheric
199 (HF) frequency range of 2.0000 to 29.9999 conditions.
MHz.
6. VHF-FM Radio Set  AN/ Two-way voice communication in Line of sight.
ARC-186 (FM-2) frequency range of 30.000 to 87.975 MHz.
3-1
TM 1-1520-248-10
TABLE 3-1. AVIONICS EQUIPMENT CONFIGURATION (Cont)
NOMENCLATURE USE RANGE
11. (CDS2) KY-58-2 Provides secure two-way voice N/A
Communication Security communication for UHF, VHF, or FM-2
Set  TSEC/KY-58 radio.
12. KY-58-2 Provides secure two-way voice N/A
Communication Security communication for VHF radio.
Set  TSEC/KY-58
13. KY-75 Communication Provides secure two-way voice N/A
Security Set  TSEC/KY- communication for HF radio.
75
14. Transponder set  AN/ Transmits a coded reply for interrogator Line of sight.
APX-100 systems.
15. Radar Detecting Set  Provides visible and audible warning in Line of sight.
AN/APR-39A(V)1 radar environment.
16. Radar Warning Set  AN/ Provides visible and audible warning in Line of sight.
APR-44 radar environment.
17. Laser Detecting Set AN/ Provides visible and audible warning of Line of sight.
AVR-2A laser designating or ranging equipment.
18. (CDS2) Airborne Target Provides two digital communication links N/A
Handover System (ATHS) through the radios to other compatible
devices.
3-2
TM 1-1520-248-10
TABLE 3-1. AVIONICS EQUIPMENT CONFIGURATION (Cont)
NOMENCLATURE USE RANGE
19. Embedded Global Measures pitch, roll, heading, angular N/A
Positioning System/Inertial velocity, linear velocity, and acceleration.
Navigation System (EGI) Combines this information with position
data provided by the GPS satellites.
20. Improved Data Modem Provides two digital communication links N/A
(IDM) through the radios to other compatible
devices.
21. Infrared (IR) Jammer Provides countermeasures against infrared Line of sight.
Countermeasures Set  heat seeking missiles.
AN/ALQ-144
SECTION II. COMMUNICATIONS
3-4. COMMUNICATION SYSTEM. NOTE
The communication system provides two way (CDS4) The ARC-220 radio is the only HF
radio recognized by CDS4 software. If ARCcommunications
　
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