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 –
Summary of Contents for 18T
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