BRISTOL SIDDELEY SMALL ENGINE DIVISION ARTOUSTE MK 520 AUXILIARY POWER UNIT (APU) TECHNICAL SPECIFICATION. Pub nO. T.S.C. 203. February 1967. Issue 1. Copy No. 84. 215mmx280mm. 36 pages including 6 performance graphs. Contents: Introduction; Purpose; Leading Particulars; Physical Standards; Functional Standards; Design Features; Installational Features; Installation Drawings; Engine Systems; Performance; Weight data. Comb bound.  Very good condition. Please see other aviation literature and photograph listings, postage is combined.