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RESTRICTED   T. O. No. 02-35GC-1

7. Landing.

a. Preparatory to landing, controls will be set in the following manner:

(1) The mixture control will be set in "Auto-Rich."
(2) The propeller control will be placed in the maximum cruising rpm position.
   
b. In the event it is found necessary to interrupt the glide and make another landing approach, the throt-tole will be adjusted first and then the propeller con-trols placed in the "High rpm" (low pitch) position.

c. After landing and during taxiing, the propeller controls will be placed in the "High rpm" (low pitch) position.

d. Models R-1820-65, -73 and -97 Engines Only.

(1) With the throttle of one engine set at full throt-tle, adjust the waste-gate regulator of the turbo-super-charger to obtain 39 inches mercury manifold pressure. Lock the waste-gate regulator control and retard the throttle to desired power for landing approach. Re-peat this operation for each engine. Manifold pressure in excess of 39 inches mercury will result in detona-tion with a resultant loss of power

(2) Move the throttles gradually to "Closed."

(3) When the airplane is on the ground, move the turbo-supercharger control to "Off."

e. If an emergency arises requiring the use of full engine power, move the throttles to "Full Throttle" and proceed as outline in paragraph 4.

f. Care should be exercised to prevent overcooling of the engine during long glides.

8. Stopping

a. Propeller controls will be left in the high rpm position.

b. Allow the engine to run at normal idling speed with the nose cowl or radiator shutters (if installed) fully opened until the engine has cooled appreciably below cruising temperature. Cylinder and oil pressure will normally reach values below cruising temperature during the gliding for landing and taxiing.

CAUTION: On higher output engines, it may be necessary to idle at a higher speed than the normal idling position to prevent overheating and fouling of plugs on the ground. It may also be necessary to shorten the idling period to a minimum, in order to prevent this overheating. Temperatures must be carefully controlled and must not be permitted to exceed the specified limits.

c. Move throttle to "Full Open" position at the same time that the mixture control is moved to "Full Lean" or "Idle Cut-Off" position in order to remove the accelerating charge from the induction system.

d. Turn ignition switch to "Off" position after engine ceases firing.

e. Mixture control will be left in the "Full Lean" or "Idle Cut-Off" position until engine is started again.

f. Instructions on the use of the oil dilution system may be found in T. O. No. 02-1-29.

9. Mixture Control.

a. Refer to T. O. No. 03-10G-1 for general in-formation including definition of carburetor settings such as "Auto-Rich" referred to herein.

b. Above desired cruising manifold pressure and speed, the mixture control lever shall be set in "Auto-Rich."

c. At or below desired cruising manifold pressure and speed, the mixture control may be set in "Auto-Lean" if fuel economy is important.

CAUTION: When operating at "Auto-Lean" the setting should be changed to "Auto-Rich" immediately before a rapid change in altitude or a change in cruising conditions is made.

d. As fuel/air ration is decreased (engine leaned out) cylinder head temperatures may increase. Do not exceed temperatures specified in section III.

10. Turbo-Supercharger

a. In addition to specific instructions given in this Technical Order, personnel operating aircraft equipped with turbo-superchargers should read and familiarize themselves with the operating instructions contained in T. O. No. 03-10DA-2, and the Handbook of Instructions for type A-7 supercharger regulators, T. O. No. 03-10D-2.

b. If the turbo-charger is turned off at high altitudes, difficulty may be encountered in restarting the turbine because of lack of heat applied to the turbine wheel. To restart the turbo at high altitudes, turn the supercharger control to the "Off" position; open the throttle to "Full Throttle"; adjust the propeller control to the "High rpm" position; lean the fuel/air ratio and adjust manifold pressure to the desired values. In order to avoid damage to the engine be-cause of too-lean fuel/air ratios, the preceding setting should be made as quickly as possible. Turn super-charger control "Full On," enrich mixture control, then adjust rpm and manifold pressure to desired values.
          
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