Yak 18T Flight Operations Manual
Page 77 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.
2. If testing the wiper on dry glass, do not switch it on for more THAN 10s
3. Switching-off the wiper from any speed is accomplished by setting the WIPER switch to
the NEUTRAL position
4. The wiper's brush can be returned to the initial position only after it has stopped. The
WIPER switch can be kept in the INITIAL position for not more than 2-3 seconds
12.2.4 The Heating and Ventilation System
A heating and ventilation system is provided to ensure normal temperature conditions inside
the aircraft's cabin. In winter an air heater is placed in the nose section under the cowling. A
supply of hot air from the heater can be delivered to the cabin by using a control from the
right-hand side of the cabin. Hot air to the cabin is fed from the heating extension pieces
mounted near to the pilot's feet. The windscreens of the cabin are heated. Switching-on of
the heating system is possible both in flight and on the ground after the engine has been
started. In summer, the heater is removed and there is ventilation from the velocity head.
The cabin ceiling has a rotating spindle for controlling personal ventilation of cool air.
12.2.5 Aneroid and diaphragm actuated instruments and the pitot static systems
Description and Usage
The following instrument panel mounted aneroid and diaphragm instruments: the altimeter,
speed indicator and variometer are used for measuring the flight altitude, horizontal and
vertical velocities. The pilot and static pressures are applied to the instruments by means of
the pilot-static tube and pilot pressure pipelines (painted in black) and static pressure
pipelines (white color). The instruments are connected to the static pressure pipelines and
only a velocity indicator is connected to the pitot pressure pipelines.
The pitot-static tube is mounted on the left detachable wing assembly on a special-purpose
boom and is brought out forwards at a 500-mm distance from the wing leading edge to the
undisturbed-flow area. The pitot-static tube is fitted with a heating element, which is
switched on using the circuit breaker, HEATING CLOCK, which is placed at the board under
the middle instrument panel. The heating element of the pitot static tube is supplied from
27V-10% DC voltage.
Prior to flight
Set the barometric aerodrome pressure on the altimeter pressure scale according to the air
traffic control data at the take-off moment.
Prior to take-off
Make sure, that the scale indications of the altimeter pressure scale correspond to the
aerodrome atmospheric pressure.
In flight
1. After take-off and transition climb set the barometric pressure on the altimeter pressure
scale to 760mm of Hg
2. If the aircraft turns out to be in a zone of rain, snow and icing, switch-on the heating of
the pitot-static tube using the circuit breaker HEATING CLOCK
3. In the descent mode control the vertical speed by the variometer
4. On getting approach clearance, change the altimeter scale barometric pressure of 760
mm of Hg to the indication, which corresponds to the atmospheric landing airfield
pressure, in the horizontal flight at the transition level. Prior to setting the airfield
pressure on the altimeter transmitted by the approach controller, compare the landing
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