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l. Heater exhaust protective cover
m. Heater inlet cover.
2-15-25. Helicopter Security (Typical).
The helicopter is equipped with door lock security devices
(fig. 2-15-6). These devices prevent interior access
to the helicopter by unauthorized persons. Install the
devises as follows:
a. Make sure the ramp is full up. Install the cable
hook through the ramp controls access door latch. Secure
the fastener to the bracket. Make sure the warning
streamer is visible.
b. Close the lower rescue hatch door. If the door
cannot be closed, secure the utility hatch to a tiedown
ring with a cargo strap.
c. Secure the release straps of the two cabin escape
hatches and cargo door escape hatch will restraining
clamps. Make sure clamps are located as close to the
release grommet as possible. Make sure the warning
streamers are readily visible.
d. Install lock pins through the pilot’s and copilot’s
window latches. Then, insert the quick-release pin
through the bracket on the floor and into the door latch
plate. Make sure the warning streamers are readily visible.
e. Install left forward latchable escape hatch cover.
f. Close the cabin doors. Install the bracket with the
padlock.
TM 1-1520-240-10
2-15-19
Figure 2-15-4. Protective Covers
TM 1-1520-240-10
2-15-20
Figure 2-15-5. EAPS Protective Covers
TM 1-1520-240-10
2-15-21/(2-15-22 blank)
Figure 2-15-6. Installation of Helicopter Security Devises (Typical)

TM 1-1520-240-10
3-1-1
CHAPTER 3
AVIONICS
SECTION I. GENERAL
3-1-1. Description.
The avionic systems in the CH 47D helicopters consist
of the communications equipment providing HF, VHF
AM/FM, and UHF-AM communications. The navigation
equipment includes LF-ADF, VOR ILS, Marker Beacon,
Doppler/GPS, and Omega. VHF-FM homing is provided
through the AN/ARC-201 FM communication radio.
Transponder equipment consists of an IFF receivertransmitter
with inputs from the barometric altimeter for
altitude encoding. Absolute height is provided by a radar
altimeter. For mission avionics equipment, refer to Chapter
4, Mission Equipment.
3-1-2. Avionics Equipment Configuration.
Equipment configuration in the CH-47D helicopter is
listed in table 3-1-1.
3-1-3. Avionics Power Supply.
Power to operate the avionics systems is supplied by the
No. 1 and No. 2 DC buses, the DC essential bus, and No.
1 and No. 2 115-volt and 26-volt AC buses (Chapter 2).
The No. 1 VHF AM/FM, interphone and UHF sets can be
operated by selecting the BATT switch to ON. To operate
the remaining avionics equipment, the APU generator or
the main helicopter generators, must be operating, or AC
ground power must be connected. All circuit breakers
must be in.
TM 1-1520-240-10
3-1-2
Table 3-1-1. Communications/Navigation Equipment
FACILITY DESIGNATION
USE LOCATION
INTERPHONE C-6533/ARC INTERCOMMUNICATIONS BETWEEN
CREWMEMBERS AND RADIO CONTROL
THREE INTERPHONE CONTROLS
ON CONSOLE,
THREE INTERPHONE CONTROLS
IN CABIN
UHF RADIO AN/ARC-164 TWO-WAY UHF-AM COMMUNICATIONS CONTROL ON CONSOLE
(INCLUDES R/T)
VHF AM/FM RADIO AN/ARC-186 TWO-WAY VHF AM/FM COMMUNICATIONS
CONTROL ON CONSOLE
(INCLUDES R/T)
VOICE SECURITY
EQUIPMENT
TSEC/KY-58 TWO-WAY CLEAR OR SECURE VOICE
COMMUNICATION FOR NO. 1 VHF/FM
RADIO
CONTROL ON CONSOLE
TSEC/KY-75 COMSEC CONTROL ON CONSOLE (IF
INSTALLED)
TSEC/KY-100 SECURE VOICE AND DATA COMMUNICATION.
OPERATIONAL WITH NARROW
AND WIDE BAND RADIOS (HF,
VHF, UHF, SATCOM)
CONTROL ON CONSOLE (IF
INSTALLED)
VHF NAVIGATION
AND INSTRUMENT
LANDING SYSTEM
AN/ARN-123 PROVIDES VOR BEARINGS AND
COURSE INFORMATION, ILS LOCALIZER,
GLIDE SLOPE, AND MARKER BEACON
INDICATIONS
CONTROL ON CANTED
CONSOLE
DIRECTION FINDER
SET
AN/ARN-89 AUTOMATIC OR MANUAL DIRECTION
FINDING AND HOMING
CONTROL ON CANTED
CONSOLE
GYROMAGNETIC
COMPASS SET
AN/ASN-43 PROVIDES HEADING INFORMATION IN
FREE GYRO OR MAGNETIC MODES
CONTROL ON OVERHEAD
SWITCH PANEL
DOPPLER NAVIGATION
SET
AN/ASN-128 PROVIDES WORLDWIDE NAVIGATION
CAPABILITY WITHOUT USE OF
GROUND FACILITIES
CONTROL ON CANTED
CONSOLE
DOPPLER GPS
NAVIGATION SET
AN/ASN-128B PROVIDES WORLDWIDE NAVIGATION
CAPABILITY WITHOUT USE OF
GROUND FACILITIES
CONTROL ON CANTED
CONSOLE (INCLUDES DISPLAY)
TRANSPONDER
SYSTEM
AN/APX-100 RADAR IDENTIFICATION AND TRACKING
　
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