Complete Command Set List

Plugs:
Receiver Rack, Battery 6578
Receiver Rack, Modulator 6784
Receiver Rack, Receiver Control Box 6577
Modulator, Transmitter Control Box 6963
Transmitter Rack, Modulator 6964
Modulator, Battery 6965
Transmitter Rack, Antenna Relay 6967

Tools:
Tube Extractor 7489
Bristo Wrench #6 8021
Phillips Screw Driver #1A 8020
Knob Assembly, local tuning 6743

Splined Cable Components:
Casing 3406
Shafting 1174
Nut 1167
Sleeve 6585
Spline 6788
Tag 6789

Dials for Receiver Control Box:
190-550 Kc 6051
520-1500 Kc 6052
1.5-3.0 Mc 7575
3.0-6.0 Mc 6053
6.0-9.1 Mc 6054

Miscellaneous: (RX=Receiver, TX=Transmitter)
RX Dynamotor Brushes (Low Voltage) 23609-3
RX Dynamotor Brushes (High Voltage) 23609-4
TX Dynamotor Brushes (Low Voltage) 23609-6
TX Dynamotor Brushes (High Voltage) 23609-9
NOTE: Each brush part number must be suffixed with the appropriate "+" or "_". For example,  on the 28 VDC end of the RX dynamotor, you would need both a 23609-3(+) and a 23609-3(-).  Each brush is marked appropriately, and so is each brush holder.

Shock absorber unit:
In 2-RX or 2-TX shock mount 5185
In 3-RX shock mount 5195
In modulator shock mount 7067
In antenna relay shock mount 7065

NOTE: The above information was taken from:
First Edition of Final Instruction Book for Model ATA and Model ARA Aircraft Radio Telegraph and Telephone Transmitting and Receiving Equipment. Aircraft Radio Corporation Boonton, New Jersey Contract Number NOs-74192 dated June 29, 1940.

2. SCR-274N Components:
A-61-A Dummy Antenna (for transmitter tests)
BC-442 Antenna Relay
BC-450 Remote Control (for 3 receivers)
BC-451 Remote Control (for up to 4 transmitters)
BC-453 Receiver 190-550 Kc
BC-454 Receiver 3.0-6.0 Mc
BC-455 Receiver 6.0-9.1 Mc
BC-456 Modulator
BC-457 Transmitter 4.0-5.3 Mc
BC-458 Transmitter 5.3-7.0 Mc
BC-459 Transmitter 7.0-9.1 Mc
BC-473 Remote Control (for 1 receiver)
BC-496 Remote Control (for 2 receivers)
BC-696 Transmitter 3.0-4.0 Mc
BC-946 Receiver 550 Kc - 1.5 Mc
DM-32 Dynamotor (to power receiver from 28 volts DC)
DM-33 Dynamotor (to power modulator & transmitter from 28v)
FT-220 Mounting Rack (for 3 receivers)
FT-221 Shock Mount (for 3 receivers)
FT-222 Mounting Plate (for 3-receiver remote control box)
FT-225 Shock Mount (for modulator)
FT-226 Mounting Rack (for 2 transmitters)
FT-227 Shock Mount (for 2 transmitters)
FT-228 Mounting Plate (for transmitter control box)
FT-229 Shock Mount (for antenna relay)
FT-230 Adapter (for remote control of receiver, plugs into lower front of receiver, has only a "pull-type" handle)
FT-231 Shock Mount (for 1 receiver)
FT-232 Shock Mount (for 1 transmitter)
FT-233 Mounting Rack (for 1 receiver)
FT-234 Mounting Rack (for 1 transmitter)
FT-235 Mounting Plate (for 1-receiver remote control box)
FT-240 Mounting Plate (for 2-receiver remote control box)
FT-260 Adapter (for local control of receiver, plugs into lower front panel of receiver, has headphone jack, volume control, and switch.)
FT-262 Shock Mount (for 3 transmitters)
FT-264 Mounting Rack (for 4 receivers)
FT-276 Mounting Rack (for 3 transmitters)
FT-277 Mounting Rack (for 2 receivers)
FT-278 Shock Mount (for 4 receivers)
FT-279 Shock Mount (for 2 receivers)
FT-331 Mounting Rack (for 4 transmitters)
FT-332 Shock Mount (for 4 transmitters)
I-84 Receiver test unit
I-85 Transmitter test unit
MC-211 Right-angle adapter for splined cable
MC-215 Splined cable for receiver remote control (these came in various lengths from 18" to 13 feet!)
MC-237 Local tuning knob (spinner type) for receiver (may also carry MC-236 designator or 6743 part number.)
RC-54 Receiver Test Set (Includes I-84 test unit)
RC-55 Transmitter Test Set (Includes I-85 test unit and A-61-A dummy antenna)

Plugs:
PL-147 Plug, 2-pin, part numbers 6578 or 9127
PL-148 Plug, 3-pin, part numbers 6965 or 9126
PL-151 Plug, 6-pin, part numbers 6784 or 9123
PL-152 Plug, 8-pin, part numbers 6577 or 9125
PL-153 Plug, 18-pin, part numbers 6963 or 9121
PL-154 Plug, 12-pin, part numbers 6964 or 9122
PL-156 Plug, 5-pin, part numbers 6967 or 9124
PL-157 Plug, 2-pin, part numbers 3146 or 7543 (discontinued)
PL-192 Plug, adapter to permit local control of receiver, part number 6787

NOTE: The connectors have two part numbers. One for the "standard" wiring harness, and one for an open wiring harness. (One has a backshell, the other does not.) The two variants are the basic plug number, and the basic number plus an "A" suffix.

NOTE: Both HF and VHF equipment is shown in the list above, unlike the original lists in the manual. Equipment in the "VHF" list in the manual included: C-30, C-30A, C-42, C-43, DY-2, R-28, T-23, and the IE-35-A and AN/GRM-1 test equipment.

The following appeared on a separate list under the heading "Major Units Usable With Several Aircraft Equipments": C-38, C-39, C-48, J-16, J-17, J-22, J-22A, MT-78, MT-80, MT-85, and MT-98 (some of which were already on that list).

Above taken from: Handbook of Operating Instructions for Model AN/ARC-5 Aircraft Radio Equipment, NAVAER 08- 5Q-95, dated 21 February 1944.

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