Tb3-117Bm Engine Cranking; Engine False Start - Kazan Helicopters Mi-17-1V Flight Manual

M,,·17·1B. Flight manual
(b) Sudden rise of the compressor turbine inlet temperature above the
maximum limit.
(d) Important vibration of the engine or unusual noise.
(e) Sudden drop or rise of the gas generator rotor speed.
(f) At the ground observer's order.
(g) Initiation of fire.
(h) Severe torching from the exhaust pipe.
Perform emergency shutdown of the engines by setting the fuel
shutoff valves to ENG SHUTDWN LEFT, RIGHT (OCTAHOB
,QBlIlr. nEB, nPAB).
In case of failure of the fuel shutoff valve shut the engine down by
closing the fuel fire shutoff valve.
Effect emergency shutdown of the engines with the engines running
at any power.
If a necessity to execute emergency shutdown of an engine arises
during run up in hovering do it after the helicopter landing.
Caution: Further operation of the engines after its emergency shut-
down is allowed after clearing the reasons which have
caused it.
3.12. TB3-117BM engine cranking
(1) Crank the engine for the purpose of purging fuel accumulated in the
combustion chamber upon abortive start, determination of the maximum
speed attained by the gas generator rotor during spinning by the pneu-
matic starter and checking the auto start control unit cycle of operation.
(2) To perform cold cranking set the mode selector switch to CRANK
(npOKPYTKA), the LEFT - RIGHT (nEB - nPAB) selector switch to the
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desired engine, and depress the starting button for 1 to 2 s.
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Check the gas generator rotor for being accelerated up to a speed of
20% minimum by the pneumatic starter and check duration of the auto
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start control unit cycle of operation which should be within the limits of 51
to 59 sec. The engine oil pressure should be 0,5 kgf/cm
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minimum.
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3.13. Engine false start
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(1) False start is to be performed in case of necessity to test the systems in-
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volved in the starting process and during preservation and depreservation
of the engine fuel system.
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(2) Perform false start in a way similar to cranking but with the fuel fire shut-
off and engine shutdown valves open (no fuel ignition).
- - - - - - - - .
---~~~~;::~tl~:-~:::~s:~~;;~switch---tO-eRANK-(flPeKPYTAA)-and-the---
L~FT
·RIGHT (nEB· nPAB) selector switch set to the desired en·
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glne.
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(b) Start the service tank fuel booster pump and open the fuel fire shut-
off valves.
(c) Depress the starting button for 1-2 s, and set the fuel shutoff valve
of the engine being tested to OPEN (OTKPbITO).
At engine false starting the gas generator rotational speed should
be 20% minimum.
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