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Section 3045  DESCENT

B. STARTING POINT OF DESCENT (CONT'D)

2. The altitudes given here are approximate, as in cold weather the densities will be higher and in hot weather lower for any given pressure altitude. Since air densities affect propeller performance it will be found that the propellers will govern at higher altitudes during cold weather for any given rate of descent, propeller speed and engine power.

3. If there is a tail wind, start the descent a little further out. If there is a strong head wind, start the descent a little later than normally, or start at the same place (see Par. 1.) and decrease the rate of descent to 250-280 feet per minute. For passenger comfort in very rough air decrease the speed of the plane, which will be 175 to 180 MPH indicated in normal descent.

C. POWER SETTING.

1. Do not allow ;manifold pressures to exceed maximums as altitude is reduced. (See Power Charts).

GR-1820G-102   R-1830-92

2. When descending through an icing overcast (carburetor) put on full carburetor heat.   When descending through an icing overcast, (carburetor) put on 90° F. carburetor heat.

This affects protection against carburetor icing and allows for a reduction of power as well.

3. If it is necessary to further reduce power, it should be done by reducing engine speed.

Engine speed should not be reduced below 1600 RPM.   Engine speed should not be reduced below 1700 RPM.

2/1/47   DC-3 FLIGHT OPERATION