ENGINES
Rolls-Royce M250 Turbine Engine Evolution of the M250 Series
Series I • T63-A-5 (civil designation M250-C10), rated @ 317 shp, certifi ed in 1962.
• T63-A700 (civil designation M250-C18), rated @ 317 shp, certifi ed in 1965.
• Offered full thermodynamic rating struc- ture and improved TBO (750 hrs).
• Model 250-B15 turboprop rated @ 317 shp, certifi ed in 1969.
• A total of 6,410 Series I turboshafts and 95 Series I turboprops were produced.
Series II
• M250-C20 (Military T63-A-701), rated @ 400 shp, certifi ed in 1970.
• M250-B17 turboprop rated @ 400 shp, certifi ed in 1971.
• M250-C20B (Military T63-A-720), rated @ 420 shp, certifi ed in 1974.
• M250-B17Bturboprop rated @ 400 shp, certifi ed in 1974. (limited by PRGB)
• M250-B17B turboprop rated @ 420 shp, certifi ed in 1979. (improved PRGB)
• M250-C20R rated @ 450 shp, certifi ed in 1986, featured improved compressor.
• M250-B17F rated @ 450 shp, certifi ed in 1988, featured improved compressor.
Series III
• M250-C28 rated @ 500 shp, certifi ed in 1976, featured single stage centrifugal compressor with beefed up gearbox and turbine airfl ow improvements.
• M250-C28B rated @ 500 shp, certifi ed in 1978, featuring improvements in compressor, combustor and turbine airfl ow.
• A total of 936 Series III engines were produced.
Series IV
• M250-C30 series rated @650 shp, certifi ed in 1978.
• M250-C30R (Military T703-A-700), rated @ 650 shp, certifi ed in 1983, featured a electronic supervisory fuel control system.
• M250-C40 and C47 (Military M250- C30R/3), rated @ 650 shp, certifi ed in 1996, features improved compressor airfl ow, air cooled turbine nozzle, low smoke combustor and a full authority digital engine control system (FADEC).
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December 2014 | January 2015
HelicopterMaintenanceMagazine.com 27
ACES Systems announces the new
All the Applications that made the VIPER the world leader in Vibration Analysis and Dynamic Balancing...
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Preferred cleaning of the fuel engine nozzle is done with an ultrasonic cleaner. If that is not available, use a toothbrush to remove the carbon buildup. When carbon is allowed to build up on the fuel nozzle, it can cause streaks on the combustion chamber walls and liner, which leads to holes in the wall of the liner and burn holes through the vanes of the fi rst and second stage nozzles. After cleaning, run clean fuel through the nozzle to make sure that no streaks are visible. HMM – With the Rolls-Royce M250 engine in use in many helicopters operating in salt water environments, what can an operator do to minimize the problem of corrosion? PT – The gearbox housing, which is made of magnesium, poses a prime risk for helicopters operating in a salt water environment, and appropriate steps should be employed to keep the helicopter as free from salt water corrosion as possible. A daily fresh water wash of the compressor is a
Compressor and Turbine Mounting Studs – Photos Courtesy of Premier Turbines
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