TM 11-5821-333-30
CHAPTER 5
MAINTENANCE INSTRUCTIONS FOR
ELECTRICAL EQUIPMENT MOUNTING BASES
MT-6373/ARC-201 (V) AND MT-6374/ARC-201 (V)
Section I. Principles OF OPERATiON
5-1. MOUNTiNG BASE FUNCTiON
The mounting bases physically support the rts.
The MT-6373 mounting base is used with RT-1477 and RT-1477A rts.
It has cables and connectors that adapt
the rt to the aircraft. The combination of rt and mounting base can be used to replace an AN/ARC-54/131/186
radio.
The MT-6374 mounting base is used with both RT-1477, RT-1477A, RT-1478, and RT-1478A rts. lt is a mechani-
cal mount only. Electrical connections are made directly to the rt.
Section ii. REPAiR PARTS, SPECiAL TOOLS, TMDE, AND SUPPORT EQUiPMENT
5-2. COMMON TOOLS AND EQUiPMENT
For authorized common tools and equipment, refer to the Modified Table of Organization and Equipment (MTOE)
applicable to your unit. Common tools required for maintenance of the mounting base are listed in the Mainte-
nance Allocation Chart. It is appendix B of TM 11-5821-333-12.
5-3. SPECiAL TOOLS, TMDE, AND SUPPORT EQUiPMENT
No special tools are required. For TMDE and support equipment refer to the Maintenance Allocation Chart,
appendix B of TM 11–5821 -333-12.
5-4. REPAiR PARTS
Repair parts are listed and illustrated in TM 11-5821-333-23P.
Section iii. TROUBLESHOOTiNG
5-5. TROUBLESHOOTiNG
When a mounting base is received from unit maintenance, inspect it for damage. Repair any damage following
instructions in section IV. If an MT-6373 mounting base has an electrical problem, use a digital multimeter (DMM)
and figure 5–1 to locate the fault. Check that resistance of wires is 1 ohm or less. Check that resistance of coaxial
conductors is less than 1 ohm and resistance between coaxial conductors is greater that 100 kilohms. If there is a
short or open circuit, repair it. Follow the instructions in section IV.
5-1
