Environmental Systems Available to Purchase

FROM the outset it was decided that the P.1127 cabin conditioning system should be based on the boot‐strap air cycle system. Hot air from a bleed off the engine h.p. compressor would be processed in a heat exchanger‐Cold Air Unit (C.A.U.) system and delivered, cooled and dewatered, to the cabin. For cabin heating a controlled amount of hot air would bypass the heat exchanger/cold air unit assembly and enter the main supply pipe, thus raising the air temperature the required amount. Cabin temperature control would be automatic following an initial selection by the pilot, but he would also have the facility to override the automatic control if required.