Vedeneyev M-14P, Руководство по обслуживанию, Страница: 20 / 381

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To preclude overcooling of the engine in cold weather or at prolonged gliding, close shutters of the
cowling and oil cooler or periodically warm up the engine by giving throttle.
When gliding before landing shift the speed governor control lever to the LOW PITCH poaition so that in
case of necessity (faulty landing planning, etc. ) it would be possible to select take-off rating.
When gliding at idle rating, oil pressure should not drop below 1 kgf/cm , Short-time
(up to 0.5 s) engine inlet oil pressure drop to 0.5 to 1 kgf/cm at near-zero and
negative accelerations as well as to a pressure of 1.8 kgf/cm for up to 5 s is allowed in flight. The total
time of engine operation under such conditions shall not exceed 5 min during service life.
To preclude overheating, taxi at low ratings with shutters of the cowling and oil cooler fully open.
2.2.5. In-Flight engine Operation at Low Ambient Temperatures
Engine ratings at take-off, climbing, level flight and descent in winter are similar to those of summer time;
however, when operating the engine in winter, it is necessary to take into account the following notes:
(1) Take-off and climbing may be performed with air heater disengaged when the carburetor inlet air
temperature is from 10 to 45 °C. If icing is possible, fully engage carburetor inlet air heating.
(2) To preclude freezing of oil in the airscrew cylinder during level flight periodically (in 20 to 30 min)
change over the airscrew from low pitch to high one and back and then reset the original speed of rotation.
(3) When gliding from high altitude in cold weather, engage the carburetor inlet air heating and close the
cowling shutters to preclude overcooliiif; of the cylinders and periodically warm up the engine so that the cylinder
head temperature does not drop below 120 °C.