CS-E 820 Over-torque Test

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

CS-E 820 Over-torque Test ED Decision 2007/015/R (a) If approval of a Maximum Engine Over-torque is sought for an Engine incorporating a free power turbine, compliance with this paragraph must be demonstrated by test. (1) The test may be run, if desired, as part of the endurance test of [CS-E 740](#_DxCrossRefBm1371447586). Alternatively, evidence may be provided from tests of a complete Engine or equivalent testing of individual groups of components. (2) On conclusion of such tests, the stripped condition of the Engine or individual groups of components must be satisfactory for continued running. (See [AMC E 820(a)(2)](#_DxCrossRefBm1371447821)) (b) The test conditions must be as follows: (1) A total of 15 minutes run at the Maximum Engine Over-torque to be approved. This may be done in separate runs, each being of at least 2½-minutes duration. (2) A power turbine rotational speed equal to the highest speed at which the Maximum Engine Over-torque can occur in service, but not more than the limit speed of Take-off or OEI ratings of a duration longer than 2 minutes. (3) For Engines incorporating a reduction gearbox, a gearbox oil temperature equal to the maximum temperature at which the Maximum Engine Over-torque could occur in service; for other Engines, an oil temperature within the normal operating range. (4) A turbine entry gas temperature equal to the maximum steady state temperature to be approved for use during periods longer than 20 seconds when operating at conditions not associated with 30-Second or 2-Minute OEI Power Ratings, unless it can be shown that other testing provides substantiation of the temperature effects when considered in combination with the other parameters identified in CS-E 820(b)(1), (b)(2) and (b)(3). [Amdt No: E/1]