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REGULATIONS SECTION 3042 CLIMB A. AT 500 FEET 1. After 500 feet of altitude has been attained, the engines may be set for cruising climb power output. 2. it is recommended that all cruising climbs be made at 120 MPH indicated air speed except when emergency or icing conditions require faster rates of climb with more horsepower. GR-1820G-102 R-1830-92 3. With 1900 REF set manifold With 2050 RPM set manifold pressure for 500 climb horse pressure for 645 climb horse power using GR-1820-G-102 power using automatic rich power calculator to obtain side of S1C3-G power calculator correct boost setting. to obtain correct boost setting. 4. Use F/A mixture ranging from Use "auto rich" position of the .083 to .090 for normal mixture control for cruise climb cruise climb at 120 MPH in- leaving cowl flaps in the "trail" dicated airspeed or over. position. Maximum permissible Use .082 to .085 F/A If cyl- head temperature for take-off inder heads are running below or for rated power is 500 degrees F. 350 degrees F or .086 to .090 F/A (260 degrees C). The maximum allowable when head temperatures run for cruising is 450 degrees F (232 degrees C) above 350 degrees F. If head tem- and it is desirable to maintain peratures run above 400 degrees F temperature within this limit use "Full Rich" mixture. Un- during climb. In order to do so, less head temperatures can it may be necessary to set the be maintained within limits cowl flaps in some intermediate by using higher F/A, in- position between "open" and crease the climbing air- "Closed". This may be accom- speed 10 or 20 MPH. A plished by moving the cowl flap limiting head temp. of control valve to "open" momen- 500 degrees F. is permissible for tarily, then returning it im- first 15 minutes of flight mediately to "off" when the flaps until the head temp. can have opened a small amount. By stabilize after which the repeating this momentary movement maximum for climb or cruise of the flap control valve, the is 400 degrees F flaps can be set in any inter- mediate position, turning the flaps can be set in any inter- mediate position, turning the valve to "off" in order to main- tain them in that position. With cowl flaps partially open at low airspeeds, a slight buffeting may occur due to the blanketing effect on the tail surfaces. It is therefore frequently advisable to increase climbing airspeed to 130 or 140 MPH rather than open cowl flaps excessively in order to maintain the desired head temperatures.