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Pilot`s Notes Airacobra Pilot`s Notes

Pilot`s flight operating instructions for ARMY MODEL P-39Q-1 AIRPLANE

k. RADIATOR SHUTTER CONTROLS. - There are two radiator shutter controls.

(1) COOLANT SHUTTERS. - The coolant shutter control (figure 9)marked "OPEN" and "CLOSE" is located on the cockpit door to the right of the pilot's seat.

(2) OIL SHUTTERS. - The oil shutters control handle (figure 9)marked "OPEN" and "CLOSE" is located on the fuselage turn-over beam at the pilot's right hand.

1. PARKING BRAKE. - The parking brake handle (figure 5) is located at the bottom center of the instrument panel.

6. ENGINE CONTROLS.

The engine controls are of the conventional type. The throttle control may be locked in place by the friction lock knob, located on the quadrant. Turn the lock knob (figure 5) clockwise to lock the throttle in place.- A take-off stop is located approximately at the top of the throttle quadrant to indicate the proper setting for the take-off. This stop may be released by raising the metal clip at the base of the knob and pushing the lever forward.

WAR EMERGENCY THROTTLE SETTING

The throttle quadrant on the P-39Q-1 airplane is equipped with a "War Emergency Throttle Stop." This consists principally of a light wire stop across the throttle lever slot at the usual 50.5 inches Hg limit. In an emergency, push the lever forward, breaking the wire. This will increase the manifold pressure to 57 Inches Hg. Do not maintain the pressure for more than 5 minutes at the most, and use it only in emergency. The broken wire will indicate to service mechanics that the ship will require special attention.

7. PROPELLER CONTROLS.

The P-39Q-1 airplane is equipped with an Aero Products hydraulic propeller. The propeller pitch control lever (figure 5) is located on the inboard side of the throttle quadrant.

8. CARBURETOR AIR FILTER AND HEATER.

a. Two controls for operation of the filter and heater (figure 8) are located in the cockpit at the left of the pilot's seat on the turn-over beam. These controls operate dampers in the air ducts. The first con-trol selects the desired amount of cold rammed un-filtered air which is led directly to the carburetor through a duct leading from the air scoop located on the top cowling directly over the carburetor. The second control permits the selection of hot unfiltered or cold filtered air to the carburetor.

b. It is recommended that under extreme frigid conditions, and when the airplane is kept in outside air, that a cover be placed over the carburetor air scoop to prevent snow or ice from forming on the scoop or entering the carburetor. In case a cover is not placed over the air scoop, it is necessary to thaw out the carburetor and scoop prefllght. The heat of the engine alone should not be relied upon to thaw out these units because the extreme warm-up that would be required would overheat the engine.

c. A carburetor air thermometer is installed on the main instrument panel in the cockpit to calibrate the temperature of carburetor air at all times.

d. Carburetor icing usually occurs with carburetor air temperatures below 50°F (10°C) in high humidity air. It is evidenced by roughness or loss of manifold pressure.

9. MISCELLANEOUS EQUIPMENT.

a. RELIEF TUBE. - A relief tube Is located beneath the right side of the pilot's seat.

b. DATA CASE. (See figure 4.) - Thedata case is attached to the under side of the left-hand section of the forward fuselage gun compartment cowl.

c. FIRST-AID KIT. (See figure 4.) - A first-aid kit is located on the left-hand cabin door.

d. MOORING KIT. (See figure 4.) - A mooring kit is located on the deck of the aft fuselage.

e. SIGNAL LIGHT. - An AN-3089 signal light is located on the right-hand cabin door.

f. FLASHLIGHT. - A flashlight is clamped to the lower edge of the plexiglas frame on the left-hand side of the cabin.

Figure 4 - General Arrangement
1. GEAR BOX OIL TANK 2. DATA CASE 3. BATTERY
4. 37MM AMMUNITION RACK 5. FUSELAGE .50 CALIBER GUNS 6. INSTRUMENT PANEL
7. GUN SIGHT 8. PILOT'S SEAT 9. POWER PLANT
10. AIRPLANE TOOL KIT 11. COOLANT TANK 12. OIL TANK (ENGIHE)
13. MOORING KIT 14. RADIO 15. 37 MM CANNON
16. OXYGEN TANK 17. GLYCOL TANK 18. .50 CALIBER WING GUN
19. OIL COOLERS 20. COOLANT RADIATOR 21. ENGINE TOOL KIT
22. WING OXYGEN TANK 23. FIRST AID KIT 24. RADIO

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