Yak 18T Flight Operations Manual
Page 39 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.
• Training flights into cloud are NOT allowed. In the cases of inadvertent IMC, the pilot
must level out by a smooth pulling of the yoke and continue to pilot the aircraft relying
on the gyro-horizon and electrical turn indicator. The pilot must compare the readings of
the –
• gyro-horizon and electrical turn indicator and make sure that there is NO banking or
turn
• gyro-horizon and the VSI indicator and make sure that the aircraft is flying
HORIZONTALLY
The pilot should CONTINUE instrument flying and perform a 180° turn using a
maximum 15° angle of bank and SET a descent of 2-3m/s to break out of the clouds
• Flying OVER 4000m can be performed only if OXYGEN equipment is available on board
7.6. Horizontal Flight
When performing circuit flights (undercarriage up or down) it is advisable to maintain an IAS
of 170-180km/h. CHECK for normal engine running conditions during horizontal flight,
these are the same for flight planning.
• After climbing to a specified level, SET the speed and engine boost pressure according to
the engine regime selected. At normal conditions during horizontal flight, the engine
instruments should read as follows –
Fuel pressure 0.2-0.5 kgf/cm²
Engine inlet oil temperature 50°C-65°C
Oil pressure 4-6 kgf/cm² 1.0kgf/cm² at minimum
rpm
Cylinder head temperature 140°C-190°C
Carburettor inlet air temperature ≥ +10°C
• During warm weather, carburettor heat must be SWITCHED OFF as a high temperature
of air coming into the carburettor causes a DECREASE in the engine POWER and
therefore engine efficiency
• In all cases of horizontal flight in conditions of increased humidity with the air
temperature becoming lower than +10°C, carburettor heating must be SWITCHED ON
• In-flight fuel consumption is to be monitored by using the fuel level indicators for both
tanks and the clock. When the RESIDUAL FUEL red light on the panel is illuminated, it
means that 30litres of fuel remains in the tanks, this amount will be sufficient for a
MAXIMUM OF 40-45 minutes of flying. See below!
• Aircraft onwards of No.0604 have an improved emergency fuel capacity monitoring
system that provides a separate remaining fuel warning in the main fuel tanks. When the
remaining fuel reaches 15litres, the fuel quantity low warning lights come on FUEL
RIGHT or FUEL LEFT. This applies to HA-YAV
• Controlled changes to in-flight engine power is recommended as followings -
a) to reduce power (conditions) -
• DECREASE the boost pressure
• DECREASE the engine crankshaft rotational speed to the specified one
• ADJUST the boost pressure
b) to increase power (conditions) –
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