Operation Manual

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Engine:
Operating the Engine
4
4-6-01
S/BVM 628
4.7 Running the Engine with Defective Turbocharger
If blades of the turbocharger rotor are warped or broken (indicated primarily by turbocharger
vibration or abnormal noise) or if bearings have run hot, it will be recommendable to take the
turbocharger out of service (BBC instruct.). In this case it will be necessary to reduce engine speed
/ power substantially to make sure that the exhaust temperatures at full load as stated in the
acceptance test sheet will not be exceeded. The remaining b.m.e.p will be 4,5 bar only.
This applies both to engines with a single turbocharger and engines with several turbochargers
where not all rotors have been inactivated.
The following table of maximum obtainable speeds / loads as a function of the b.m.e.p. of the rated
power (Acceptance documents) fixed-pitch propeller.
Max. Obtainable Speeds / Outputs with Inactivated Turbocharger
B.m.e.p. of rated power Obtainable speed in % Obtainable power in %
(Accepted documents) of rated speed of rated power
bar approx. approx.
11 64 26
14 56,5 18
16 53 15
18 50 12,5
20 47,5 11,5
BRAKE MEAN EFFECTIVE PRESSURE