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Aviation History
1954
1954 - 0823.PDF
FLIGHT, 26 March 1954 369 PEMBROKE COCKPIT (1) Flying controls locking lever, (2) Throttle friction control, (3) Throttles, (4) Pitch levers, (5) Undercarriage selector, (6) Flap selector; (7) Rudder trim, (8) Aileron trim, (9) Elevator trim, (10) Oil cooler shutter controls, (11) Air-intakes control, (12) Red floodlamps, (13) Ultra-violet lights, (14) Emergency red flood- lamp, (15) Engine starter and booster coil buttons, (16) Ignition switches, (17) Priming switches, (18) Slow running cut-off, (19) Master fuel cocks, (20) Air screw feathering buttons, (21) Cross-feed fuel cock switch, (22) Engine fire-extin guisher buttons, (23) Fuel cock friction controls, (24) Cross-feed cock indicator lights, (25) Wheel brakes, (26) Parking brakes, (27) Nosewheel centring control, (28) Adjustable rudder pedal control, (29) Press to transmit, (30) Zero Reader, (31) Radio compass bearing indicator, (32) I.L.S. marker light, (33) I.L.S. indicator, (34) Zero Reader control panel, (35) A.S.I., (36) Artificial horizon, (37) Rate-of- climb, (38) Altimeter, (39) Gyro-magnetic compass, (40) Turn-and-slip, (41) Clock, (42) Radio altimeter, (43) Zero Reader course selector, (44) Boost, (45) r.p.m., (46) Oil pressure, (47) Fuel contents, (48) Oil temperature, (49) Cyl. head tempera ture, (50) Air pressure, (51) Emergency air pressure, (52) Vacuum gauge, (53) Aero foil de-icing air pressure, (54) Radio compass indicator, (55) Rebecca indicator, (56) Flap position, (57) Generator warning lights, (58) U/c position, (59) Auto pilot master switch and servo units heater switch, (60) Autopilot controller, (61) Oxygen regulator, (62) Emergency u/c brakes/flap selector, (63) Radio com pass, (64) V.H.F. controller, (65) Outside air temperature, (66) Stand-by compass, (67) Direct vision panels, (68) Mixing boxes, (69) Dimmer switches, (70) Bomb selector and fusing panel, (71) Bomb release button, (72) Switches, nav. lights, oil dilution, airscrew de-icing, pressure-head heater, windscreen wipers, landing lamp, ident. light, (73) De-icing control, (74) Windscreen de-icing pump, (75) Gyro com pass panel, (76) Rebecca panel, (77) Morse key, (78) Cool air, (79) Warm air. PERCIVAL PEMBROKE . . . ward from the fin post to the leading edge and are connected just aft of the leading edge by two Z-section stringers. The leading edge is a formed Aldad sheet, riveted to the rib flanges and to the Z-section stringers. The fin sheeting extends aft of the fin- post, where it is supported by flanged formers, and provides a shroud for the rudder leading-edge. The fin-post extends below the bottom rib and forms the main attachment of the fin to the fuselage stern frame. The rudder incorporates a main spar, three auxiliary spars, and chordwise ribs, and its hinge-line is immediately forward of the main spar. The trailing edge is formed by the two portions of the skin being riveted together at their rear edges, and mass- balance weights are housed in the horn-balance section. Power Plant.—The Pembroke is fitted with two 550 h.p. Alvis Leonides 12701 engine-change units. Port and starboard installa tions are similar, the major differences being the handed exhaust- system manifolds. A tubular mounting structure is bolted to the firewall at four points, the mounting ring of the e.c.u. being attached to the forward end of this structure at five points. The exhaust manifold consists of a collector ring built-up in four sections, which exhausts through a single outlet on the outboard side of each unit; and in the inboard section of each collector is accommodated a spiral boiler for the cabin-heating system. Beneath each engine is located an air-intake assembly, which provides also a mounting for the oil cooler. An electric genera tor, air compressor, vacuum pump, tachometer generator and a combined starter motor and feathering pump are mounted at the rear of each engine, the airscrew constant-speed unit being located on the underside of the engine reduction-gear housing. The airscrews fitted to the Pembrokes manufactured to date have been of three-bladed de Havilland 3/1500/3 hydromatic type, constant-speed, non-reversing and of 9ft 4in diameter. As a result of flight tests, however, those on future machines will be of 9ft diameter (as are those fitted to other Leonides installations), giving an improved single-engine take-off performance due to a reduction in windmilling drag. Fuel is carried in four crashproof, bag-type tanks, two being installed in each wing. The 53-gallon inner tanks are located inboard of each power unit and the 66-gallon outer tanks directly outboard. Fuel is supplied from boui tanks via servicing cocks and non-return valves to a collector tank located in each under carriage nacelle and incorporating an electrically driven booster
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