C20B Training Manual

www.rolls-royce.com

Model 250-C20B/J

Power for the Bell 206B, MD Helicopters MD500, Erocopter B0-105

The C20B/J model is the cornerstone of the Model 250 engine line. With over 12,000 units delivered to date, the C20 is known worldwide for its for reliability. Since certification, the C20B has continuously benefitted from enhancements developed across the entire Model 250 product line. Recent improvements include a new first-stage turbine nozzle material that significantly extends the component’s life and maintains engine performance, along with improved gearbox lip-seals and shaft journals to reduce oil consumption. These improvements continue to decrease direct operating costs while increasing the mean time between removals. Many of these improvements can be installed by the Rolls-Royce Model 250 FIRST network of worldwide authorized repair and overhaul network centers. 

Robust, proven, modular design

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180 million fleet flight hours

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Continued improvements for increased performance and reduced overhaul costs

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Model 250 FIRST network of worldwide authorized repair and overhaul centers

Model 250-C20B/J

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Installation design

Basic engine specifications Model 250

C20B/J

Weight

158 lb

Power / weight ratio

2.7:1 3.45 lb/sec

Airflow Pressure ratio

7.1:1

Design speeds @ 100% rpm Power output shaft

6,016 rpm

Gas producer rotor

50,970 rpm

Power turbine rotor

33,290 rpm

Fuels

JP-4, JP-5, ASTM-1655, Type A, A1, B

Oils

MIL-L-7808, MIL-L-23699

Type certificate number

Shaft horsepower at takeoff

E4CE

Performance Sea level static rating

Minimum thermodynamic shaft horsepower

Sfc lb/shp-hr (max)

Model 250-C20B/J Takeoff (5 minute)

420

0.650

30 minute power

420

0.650

Max. Continuous

420

0.650

Normal Cruise

370

0.650

Cruise A (90%)

333

0.665

Cruise B (75%)

278

0.709

Rolls-Royce Corporation

®

®

®

PO Box 420 Indianapolis, IN 46206-0420 Tel: (317) 230-5985 Fax: (317) 230-3381

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Fuel flow at takeoff

© 2007 Rolls-Royce Corporation

GTP 8276 (01/07)

www.rolls-royce.com

While this information is given in good faith based on the latest information available to Rolls-Royce Corporation, no warranty or representation is given concerning such information, which must not be taken as establishing any contractual or other commitment binding upon Rolls-Royce Corporation or any of its subsidiary or associated companies.

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