CS-E 880 Tests with Refrigerant Injection for Take-Off and/or 2½-Minute OEI Power

• ED Decision 2003/9/RM found in: CS-E Amdt 5 - Engines (Dec 2018)

CS-E 880 Tests with Refrigerant Injection for Take-Off and/or 2½-Minute OEI Power ED Decision 2003/9/RM (a) *Engines for Rotorcraft.* The variation of the tests prescribed in this subpart E when using refrigerant injection must be agreed in consultation with the Agency. (b) *Engines for Aeroplanes*. Refrigerant Injection Used to Increase ISA Take-off and/or 2½-Minute OEI Performance. The following variations to the tests prescribed in this subpart E must be made: (1) *Calibration Tests.* (See [CS-E 730](#_DxCrossRefBm1371447624)). Add a calibration with refrigerant injection to demonstrate that the predicted power/thrust output will be achieved at the conditions demanding maximum refrigerant flow for each rating. This additional calibration may be made on a separate Engine if desired. (2) *Endurance Test* (See [CS-E 740(c)](#_DxCrossRefBm1371447586)). Run all normal Take-off periods (and/or 2½-Minute OEI if applicable) of Part 1 of each of the stages with refrigerant injection to achieve a mean refrigerant flow rate of at least 50% of the maximum, whilst maintaining at least the minimum declared power/thrust output and maximum declared turbine entry temperature. (3) *Accelerations* (See [CS-E 740(c) and (d)](#_DxCrossRefBm1371447586)). All the appropriate accelerations of Part 1 of each of the stages must be made with refrigerant injection selected. (4) *Idle conditions used for power orthrust response* (See [CS-E 745](#_DxCrossRefBm1371447601)). The idle conditions appropriate to the use of maximum refrigerant injection flow, as well as without, must be established. (5) *Over-speed Test* (See [CS-E 830](#_DxCrossRefBm1371447644)). Two Over-speeds will need to be declared if the Take-off maximum rotational speed with refrigerant injection differs from the Take-off maximum rotational speed without refrigerant injection. Only an Over-speed test with refrigerant injection need be run if all the critical conditions are more severe with refrigerant injection, than without. The 15-minute Over-speed test with refrigerant injection need not be run non-stop, but the duration of the individual periods of running at this condition must be not less than 3 minutes. (c) *Engines for Aeroplanes*. Refrigerant Injection Used to Restore ISA Take-off and/or 2½-Minute OEI Performance at Higher Ambient Temperature. The following variations to the tests prescribed in this subpart E must be made: (1) *Calibration Tests*. (See [CS-E 730](#_DxCrossRefBm1371447624)). Add a calibration with refrigerant injection to demonstrate that the predicted power/thrust will be achieved at the maximum declared air intake temperature whilst running within the appropriate operating limitations. This additional calibration may be made on a separate Engine if desired. (2) *Endurance Test* (See [CS-E 740(c)](#_DxCrossRefBm1371447586)). Run all the Take-off periods of Part 1 of any 10 of the stages with refrigerant injection to achieve a mean refrigerant flow rate of at least 50% of the maximum, whilst maintaining at least minimum declared power/thrust output and maximum declared turbine entry temperature. If a 2½-Minute OEI Rating is also sought then all the Take-off and 2½-Minute OEI periods of Part 1 in stages 3 to 12 must be run as above. (3) *Accelerations* (See [CS-E 740(c) and (d)](#_DxCrossRefBm1371447586)). All the appropriate accelerations of Part 1 of each of the 10 required stages must be made with refrigerant injection selected. (4) *Idle conditions used for power or thrust response* (See [CS-E 745](#_DxCrossRefBm1371447601)). The idle conditions appropriate to the use of maximum refrigerant injection flow, as well as without, must be established. (5) *Over-speed* (See [CS-E 830](#_DxCrossRefBm1371447644)). Run either without refrigerant injection at the ambient air intake temperature or with refrigerant injection with the air intake temperature raised to the highest sea-level temperature at which refrigerant is to be used, depending on which involves the more severe running conditions. If the test is run with refrigerant injection, the 15-minute period need not be run non-stop, but the duration of the individual periods of running at this condition must be not less than 3 minutes. The test may be run, if desired as part of the endurance test. Alternatively, test evidence from an Engine of similar design may be provided.