| AN 01-25CN-2 | PARAGRAPH 7 |
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f. AIR CONDITIONING. (1) GENERAL.-The heating and ventilating of the cockpit is accomplished by means of two ducts, in. serted into the radiator and the oil cooler air exit duct. A flapper valve at the junction of the hot and cold air intake ducts, operated by a push-pull control, governs the mixture of hot and cold air passed into the cockpit. The ducts feed air into both the right and left sides of the cockpit at the floor line. (2) The hot air for heating the cockpit is ob. tained from the radiator and oil cooler air exit duct. (3) The cold air for cooling the cockpit is obtained through an opening in the leading edge of the right and left wing and wing fillet. It is taken into the duct from a compartment formed by the seating of web 1, nose rib 27, and the leading edge nose section of the wing. (4) The ventilator control, located below the instrument panel outboard of the engine primer, closes the cold air intake ducts when in the "OUT" position. The control may be locked in any position by twisting the handle clockwise. Thus any desired mixture of hot and cold air may be obtained. (5) WING GUN HEATER.-The wing guns are heated through two openings in the leading edge of the wing in the radiator and oil cooler air exit duct. A flexible hose conveys the hot air to the gun installations. (6) Fig 109 shows the heat and vent system. g. ANTI-ICING EQUIPMENT. (1) This contractor is furnishing 300 sets of winterization equipment. Drawing No. 87-621-1013-9. This equipment must be installed if the airplane is to operate satisfactorily in cold climates. The installation of the propeller anti-icing equipment is shown in Fig. 110. The winterization unit consists of the following:
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h. COMMUNICATIONS EQUIPMENT. (1) DESCRIPTION.-The radio installation in this airplane depends on the allocation of the airplane. Airplanes AF42-1044-29 to AF42104509 have either SCR-274-N or SCR-522 radios installed. Airplanes AF42-104510 to AF42-104829 have SCR-274-N or SCR-522 and SCR695 radios installed. Airplanes AF42-104829 and up have SCR-274-N or SCR-522 and SCR-695 and provisions for SCR-515. On airplanes AF42-104509 and up a radio crash switch is located on the right side of the cockpit and should be used by the pilot to destroy the radio when there is danger of its failing into enemy hands. The push-button switch is painted red with the word "DANGER" across the top of the switch. The detonator provided in the radio destroys all wiring when set off by the automatic device or the switch located in the cockpit. The automatic device is set off by acceleration during a crash landing. The push-buttons must be used manually during or after a regular landing and both buttons must be pressed simultaneously. Pressing one push-button will not set off the detonator. The automatic device is a separate unit and is located near the radio which it protects. On airplanes allocated to Russia, the wiring harness for the SCR-695 radio has been installed but on most of the airplanes the plugs on the ends of the wiring harness have been removed. See Fig. III for radio installation. Before doing any work on the radio disconnect the battery. (2) To remove the SCR-274-N radio from the airplane. NOTE: All plugs on SCR-274 are nickel plated. (a) Working through the fuselage access door, remove the following from the center shelf: 1. Disconnect the control cable MC-215 from the receiver, BC-453-A (or BC-454-A or BC455-A). 2. Disconnect the antenna lead from the antenna post on the receiver. |
