Yak 18T Flight Operations Manual
Page 59 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.
Section 11 - Special Cases in Flight
11.1. Pilot Actions in case of Engine Failure
• In case of an engine failure during take-off but before the aircraft rotates,
immediately pull the thrust lever fully backwards and quickly apply the aircraft brakes
and switch off the magnetos. If the pilot fails to pass around obstacles, then by
braking one of the undercarriage wheels turn the aircraft so as to avoid a head-on
impact. If the turn is not able to prevent against impact, close the fire valve, switch
the battery off, jettison the door and retract the undercarriage
• In case of engine failure during a climb but before the turn onto the cross-wind leg,
make a transition to a glide, switch the magneto, generator and battery off and land
just in front of you. While holding-off, release the door. Change the landing direction
if the straight-in landing is dangerous for the crew because of an impending head-on
impact
• If the CHIPS IN ENGINE light is illuminated on the instrument panel (i.e. chip
appearance in the engine oil system), check the oil temperature and pressure and the
engine speed via the instruments. On making sure that the engine is operating
properly, inform ATC about it and act according to his instructions, checking
thoroughly the engine parameters. If one of the parameters does not correspond to
the Operating Instruction, stop fulfilment of the mission, inform ATC about it and
land at the nearest airfield
11.2. Pilot Actions in case of Pressure Drop
11.2.1. Engine Failure and the Primer
This section provided courtesy of Richard Goode Aerobatics (www.russianaeros.com)
Imagine that you are flying along, and then the engine begins to run roughly, or indeed
begins to stop. It is unlikely to be electrical – i.e. a simultaneous failure of both magnetos;
you haven’t felt a huge amount of vibration and therefore the engine probably hasn’t blown
up; or the propeller fallen off, so quick thinking says that the problem is fuel. So what do you
do?
Following an incident where a pilot did the wrong thing, a number of Yak pilots were asked
what they would do. There is concern as to how few people know what they should do!
Also, the correct answer to this does depend on understanding the use of the primer, which
all too many pilots of Yaks only regard as the device for cold-starting the engine. In fact it
serves as the emergency fuel pump, and indeed the aircraft will run on the primer alone,
even if there has been a dramatic problem with the carburettor, or indeed even if the
carburettor fails to work, as long as the primer is being pumped into ‘cylinder’ and air is at
least getting into the engine from the carburettor.
In terms of what to do in an emergency such as this, important points are:
• First of all check the fuel pressure. If the fuel pressure has gone down, then there is
a reasonable assumption that the fuel pump has failed
• In this case steady pumping on ‘system’ will bypass the fuel pump; supply fuel to the
carburettor and keep the engine going. It might blister your hand, but you will have
the breathing space to find somewhere to land
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