Yak 18T Flight Operations Manual
Page 34 of 82
Disclaimer: This manual is to be used as a reference only, it is based on translated Yak 18T Flight Operations
Manuals and has not been approved by the Yakovlev Design Bureau or any other authority.
and at night - to avoid discharging of the airborne accumulator due to prolonged taxiing
which is not sufficient enough to charge the accumulator
6.7. Engine Run-up
• Carry out the engine checks with the cowling gills and the radiator shutter CLOSED.
Prior to acceleration, SET the controls to the NEUTRAL position and BRAKE the wheels
• Run-up the engine to Nominal II, by pushing the throttle lever fully forwards and by
increasing the propeller pitch simultaneously. In so doing, the readings of the engine
control instruments should be as follows –
Crankshaft speed 70%
Supercharger pressure (boost pressure) Po+75±15mm of Hg
Oil pressure 4-6 kgf/cm²
Petrol pressure 0.2-0.5 kgf/cm²
Oil temperature at the engine inlet 40-75°C
Cylinder head temperature ≤ 190°C
Carburettor inlet air temperature ≥ +10°C
• The engine must run steadily and without shaking or abnormal vibration. To avoid
engine overheating as a result of insufficient airflow, the engine should NOT be operated
continuously on the ground at the Nominal Rating conditions.
CHECK the correct functioning of the magnetos and spark plugs –
• SET the propeller to the FINE PITCH position
• USING the thrust lever SET a speed of 64%-70%
• SWITCH one magneto off for 15-20 seconds and compare the drop in rpm with the
previous setting
• SWITCH both magnetos ON for 20-30 seconds (usually much quicker), until the initial
speed is recovered
• SWITCH the second magneto OFF and compare the drop in rpm with the previous
setting and note the difference in drops between both magneto checks
• SWITCH both magnetos ON
• The engine crankshaft speed (rpm) drop when one magneto is operating should not
exceed 3%
• If the drop does exceed 3%, repeat the procedure until normal operation is achieved. If
after prolonged magneto tests a drop is still found to be more than 3%, one is advised to
shutdown the engine and seek further advice
• APPLY carburettor heat and CHECK for a drop in engine rpm
CHECK the correct operation of the generator –
• SET the engine conditions to IDLING
• using the thrust lever SET the crankshaft speed to 57%-58%
• from extinguishing the GENERATOR FAILURE light, make sure that the generator has
been connected to the aircraft electrical wiring system
• CHECK the voltage being produced by the aircraft through the electrical wiring system
via the voltmeter by pushing the voltage check button, its reading must be 27V-29V
• SWITCH ON
the power consumers required for the flight - converter, radio altimeter,
radio compass, intercom system, VHF radio station, gyro-horizon inverted, compass
system, gyro-horizon and the flashing beacon and for night flights, the air navigation
equipment and the landing/taxi light
CHECK for the correct functioning of the propeller and rpm governor. To do this, proceed as
follows –
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