TM 1-1520-240-103-1-1CHAPTER 3AVIONICSSECTION I. GENERAL3-1-1. Description.The avionic systems in the CH 47D helicopters consistof the communications equipment providing HF, VHFAM/FM, and UHF-AM communications. The navigationequipment includes LF-ADF, VOR ILS, Marker Beacon,Doppler/GPS, and Omega. VHF-FM homing is providedthrough the AN/ARC-201 FM communication radio.Transponder equipment consists of an IFF receiver-transmitter with inputs from the barometric altimeter foraltitude encoding. Absolute height is provided by a radaraltimeter. For mission avionics equipment, refer to Chap-ter 4, Mission Equipment.3-1-2. Avionics Equipment Configuration.Equipment configuration in the CH-47D helicopter islisted in table 3-1-1.3-1-3. Avionics Power Supply.Power to operate the avionics systems is supplied by theNo. 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 beoperated by selecting the BATT switch to ON. To operatethe remaining avionics equipment, the APU generator orthe main helicopter generators, must be operating, or ACground power must be connected. All circuit breakersmust be in.
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
