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UDC 629.13
IS0
IN TERN AT I ON AL O R G A N I Z AT I ON FOR STAN DARD IZATl O N
IS0 RECOMMENDATION
R 482
NUMBERING OF AIRCRAFT ENGINES, ENGINE CYLINDERS
AND COMBUSTION CHAMBERS, AND DIRECTION OF
ROTATION OF ENGINES AND PROPELLERS
1st EDITION
April 1966
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COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 482, Numbering of Aircraft Engines, Engine Cylinders and
Combustion Chambers, und Direction of Rotation of Engines and Propellers, was drawn up by
Technical Committee ISO/TC 20, Aircraft, the Secretariat of which is held by the British Standards
Institution (BSI).
Work on this question by the Technical Committee began in 1953 and led, in 1961, to the
adoption of a Draft IS0 Recommendation.
In June 1963, this Draft IS0 Recommendation (No. 587) was circulated to all the IS0
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial
nature, by the following Member Bodies : c
Belgium Greece Turkey
Canada Indonesia United Kingdom
Chile Italy U.S.A.
Colombia Japan U.S.S.R.
Czechoslovakia Netherlands Yugoslavia
Denmark Spain
Germany Sweden
Two Member Bodies opposed the approval of the Draft:
France
Switzerland
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in April 1966, to accept it as an IS0 RECOMMENDATION.
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IÇO/R 482 - 1966 (E)
IS0 Recommendation R 482 April 1966
NUMBERING OF AIRCRAFT ENGINES, ENGINE CYLINDERS
AND COMBUSTION CHAMBERS, AND DIRECTION OF
ROTATION OF ENGINES AND PROPELLERS
1. NUMBERING OF AIRCRAFT ENGINES
Aircraft engine positions should be numbered in the order in which their axes are encountered
by a plane parallel to the plane of symmetry of the aircraft and moving from port to starboard.
When this plane meets the axes of several engines simultaneously they should be numbered from
front to rear, or if necessary, from the bottom upwards. The separate power sections of coupled
engines should be designated by the engine number determined in the foregoing manner, followed
by a letter “A”, “B”, etc., according to whether the power sections are port or starboard, or
bottom or top respectively (see Fig. 1).
FIG. 1. - Numbering of aircraft engines
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ISO/R 482 - 1966 (E)
2. NUMBERING OF AIRCRAFT ENGINE CYLINDERS AND COMBUSTION CHAMBERS
2.1 For the purposes of clauses 2.2 and 2.3 below, the observer is regarded as viewing the
engine from the end remote from the propeller, or from the end remote from the shaft
transmitting the greatest part of the power of the engine.
2.2 In-line piston engines (see Fig. 2)
2.2.1 Single-bank engines. The cylinders of single-bank engines should be numbered 1, 2, 3, etc.,
beginning with the cylinder nearest to the observer.
2.2.2 Double- and multi-bank engines. The banks of cylinders in double- and multi-bank engines
should be designated by the letters A, B, C, etc., applied respectively to each bank in the
order in which it would be encountered by a semi-plane centred upon the main shaft of the
engine and rotating in a clockwise direction, starting from the twelve o'clock position.
Each cylinder should be designated by a letter followed by a number, the letter indicating
the bank, as described above, and the number indicating the position of the cylinder in
the bank, when counted from the cylinder nearest to the observer.
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c3 83
c2 82
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