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be submitted to and approved by the Director General of supply and Research, and to comply with the following General Conditions:

(a) Special considerations must be given in the design to enable periodical inspection, adjustment, and top overhauls to be conducted in a minimum of time and with a minimum of labor (i.e. without removal from machine.)

(b) The engine must be capable of functioning satisfactorily at all reasonable inclinations of the machine.

One set of tracings and three complete sets of prints of approved General Arrangement and detail drawings, Schedule of Parts and Material Specifications drawn up in accordance with standard Air Ministry requirements, together with six prints of Installation Drawings, enumerating all essential details and dimensions affecting installation to be supplied on placing of contract.

Approval of Designs and Modifications. All designs and modifications are to be submitted to, and approved in writing by the Directorate of Research.

Materials. (a) Materials employed in the construction of the engine are to conform to B.E.S.A. standards and the selected schedule approved by the Director of Research.

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