Description of External Blower

TM 11-5820-518-20

is contained in the air filter holder.

surizing valve and a pressure indicator are located

on the front panel of the receiver-transmityte. Two

1-12. Description of Radio Set Control

wingnut fasteners, which attach to the mounting,

(figs. 1-1 and 1-2)

are located on the front of the mounting base.

Safety wires (not shown) prevent the wingnut

The radio set control contains operating controls

fasteners from vibrating loose.

for the receiver-transmitter and three panel lamps

1-10. Description of Mounting

(fig. 2-l). The panel lamps are mounted behind the

front panel of the C-6287/ARC-51BX (fig. 1-2). The

(fig. 1-3)

radio set control is intended for panel mounting in

The mounting provides a means of securing the

the aircraft and is held in place by four Dzus fas-

receiver-transmitter to a plane surface in the air-

teners (fig. l-l) and eight Dzus fasteners in the C-

craft. The mounting consists of a sheet metal tem-

6287/ARC-51BX (fig. 1-2). Connections to the

plate with holddown hardware. Latches are pro-

receiver-transmitter are made through a connec-

vided to attach the wingnut fasteners on the front

tor on the rear of the radio set control.

of the receiver-transmitter mounting base.

1-13. Description of Reflectometer

1-11. Description of External Blower

The reflectometer is installed on the front of the

(fig. 1-4)

receiver-transmitter (fig. l-l) and contains a radio-

The external blower is mountd on the rear of the

frequency (rf) wattmeter and a meter switch (fig.

receiver-transmitter with four retaining screws

1-5). The reflectometer is connected to the air-

and forces air through the external cores of the two

craft antenna through a connector on the upper

receiver-transmitter exceeds 95F. The external

right side of the reflectometer, and to the re-

em. Power is applied to the external blower

ceiver-transmitter through a pendant cable and

through an internal connector. The blower oper-

connector on the bottom of the reflectometer.

ates only when the internal temperature of the

1-14. Additional Equipment Required

receiver-transmitter exceeds 95F. The external

blower is equipped with a removable air filter.

The items listed below are not supplied as a

One-ampere fuse F1 for the external blower motor

part of the radio set but are required for its

Change 5

1-4.1

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