Vedeneyev M-14P, Руководство по обслуживанию, Страница: 18 / 381

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2.2. IN-PLIGHT OPERATION OF ENGINE
2.2.1. Taxiing
After starting, warming up and test running the engine and. in the course of taxiing, watch engine
instruments to avoid, overheating or overcooling of the engine.
When air temperature at carburetor inlet is below zero, perform taxiing with heater engaged so that the
carburetor inlet air temperature is not less than 10 °C.
To avoid overheating, perform taxiing at engine low ratings with cowling and oil cooler shutters fully open.
2.2.2. Take-Off and Climbing
Prior to taking off, make sure the engine is warmed up, operates without pops or vibration, and the
instruments read normally. It is recommended to start taking off at cylinder head temperature of 140 to 190 °C and
engine inlet oil temperature of
40 to 65 °C.
Make sure the speed governor control lever is in the LOW PITCH (A3) position. Prior to taking off« check
operation of the airscrew by shifting it from low pitch to high pitch at a speed of 70 % (2050 r/min) till the speed
drops to 53 % (1550 r/min) and back.
If the powerplant is in good repair and everything is ready for take-off, smoothly open the carburetor
throttle, bring the rotation speed and boost to nominal or take-off ratine (depending on the selected rating) and
start taking off.
The take-off rating may be engaged for up to 5 min running.
It is allowed to take off with the heater disengaged if the carburetor inlet air temperature is not less than 10
°C
After taking off (in climbing), select nominal rating 1 or nominal rating 11 hy the speed governor control
lever and climb to the desired altitude (climbing may be also performed at cruise rating I).
If when climbing the oil and cylinder head temperature exceeds the permissible limits, lower the rating or
level the airplane (flatten out).
If after levelling the airplane the engine temperature keeps on increasing, discontinue the flight, detect the
cause and eliminate the defects.
To change the engine rating to cruise one in flight, first decrease boost, bring the engine speed to the
desired one by simultaneously moving the carburetor throttle and speed governor control levers. Do not set the
airscrew to higher pitch before decreasing boost, otherwise the crank mechanism of the engine may be heavily
overloaded.
To increase engine rating, first increase its speed to the desired one (relieve the airscrew) and then
increase boosting.
Rotational speed rise to 109 % for up to 1 s can be tolerated in flight, the total time of operation at a speed
of 109 % shall not exceed 30 min during service life.
2.2.3. Level Flight
Level flight can be performed at the following ratings:
Nominal rating I Nominal rating II Cruise rating I Cruise rating II.
Optimal engine ratings in level flight depending on loading, speed and altitude of flying are indicated in the
special Instructions for calculating distance and endurance of flight.
When performing prolonged flight under steady conditions at low ambient temperatures, change over the
airscrew from low pitch to high pitch in every 20 to 30 min of flight by varying the speed of rotation within 67 to 55
% (1950 to 1650 r/min) and then returning it back to the original value to preclude thickening of oil in the air
screw cylinder. A short-time drop of engine inlet oil pressure to 2 kgf/cm is tolerable (followed by
restoration for 8 to 11 s).
Check oil pressure in flight which should be not less than 4 kgf/cm .
When the CHIPS IN ENGINE (CTPTSKA B JWTATME) warning lamp cornea on, concentrate on readings
of engine instruments and depending on the situation, take a decision to land.
CAUTION: IT IS PROHIBITED TO PLY BEFORE DETECTING AND ELIMINATING THE CAUSE OF IL-
LUMINATION OF THE WARNING LAMP.
2.2.4. Diving, Glinding and Landing
Engine speed at diving, steep gliding should not exceed 86 % (2500 r/min) at continuous operation of the
engine for up to 1 min.
Cylinder head minimum temperature should be not below 120 °C, oil temperature, not below 40 °C.
When gliding at idle rating or flaring out from dive, it is not recommended to give full throttle by abrupt
shifting of the throttle quadrant. Change over from idle to full throttle smoothly (during 2 to 3 s) since abrupt
acceleration may lead to airscrew spinning and high dynamic loading of the engine parts.