CS-E 690 Engine Bleed

• ED Decision 2007/015/R found in: CS-E Amdt 5 - Engines (Dec 2018)

CS-E 690 Engine Bleed ED Decision 2007/015/R (See [AMC E 690](#_DxCrossRefBm1371447772)) (a) For an Engine having bleed(s) for aircraft and/or Engine uses, the standard Engine endurance test schedule of [CS-E 740](#_DxCrossRefBm1371447586) must be varied in accordance with this paragraph CS-E 690(a) unless the use of the bleed(s) is substantiated by separate test and analysis. (1) General (i) Exercise the bleed controls at the end of each stage of the endurance test. (ii) Complete any other tests which may be necessary to demonstrate the satisfactory functioning of the Engine and the bleeds. (iii) During the tests of CS-E 690(a)(3) the Engine rotational speed(s) may be reduced if necessary when the bleeds are in operation in order to avoid exceeding the maximu m declared jet pipe temperatures. (See [CS-E 740(f)(2)](#_DxCrossRefBm1371447586).) (2) *Calibration Tests.* Include a calibration with each bleed in operation separately and one with all bleeds in operation. (See [CS-E 730](#_DxCrossRefBm1371447624)) (3) *Endurance Test.* (i) Run Stages 3, 7, 13, 17 and 23 with the bleed(s) in operation during all the conditions of running for which they are intended to be approved for use. (ii) During the four test sequences of [CS-E 740(c)(3)(iii)](#_DxCrossRefBm1371447586), an air bleed extraction need not be used where it is shown that the validity of the test is not compromised. (b) *Contamination Tests of Bleed Air for Cabin Pressurisation or Ventilation.* The specifications of this paragraph (b) are applicable where it is desired to declare that compressor bleed air is suitable for direct use in an aircraft cabin pressurisation or ventilation system. (1) Tests to determine the purity of the air supply must be made. (2) An analysis of defects which could affect the purity of the bleed air must be prepared and where necessary the defects must be simulated and tests, as agreed by the Agency, must be made to establish the degree of contamination which is likely to occur. If the defect under consideration is such that the Engine would be shut down immediately, the tests required may be modified accordingly. [Amdt. No.: E/1]