ED Decision 2018/014/R
The details required by CS-E 30 concerning assumptions should normally include information on, at least, the items listed in Table 1.
TABLE 1
Specifications/References
|
Assumptions |
ALL ENGINES |
|
Interfaces |
Applicable aircraft specifications. Flight and ground loads. Aircraft components and equipment not included in the Engine definition. Attitudes. Negative g duration. Physical and functional interfaces with the aircraft Mount flexibility. |
Engine Control System |
Type of aircraft installation. Conditions on the interfaces with the aircraft or the Propeller Environmental Conditions. |
Instrumentation |
Instrumentation required and statement of accuracy. For engines with 30-Second / 2-Minute OEI ratings, conditions imposed on the usage recording system. |
Strength |
Ultimate and limit loads; – out-of-balance loads, – operating envelope. |
Fire
precautions |
Reliance placed on the installation of
fire-zone partitioning for any part of the mounting structure or Engine
attachment points that are not Fireproof. |
Electrical
Bonding |
Reliance placed on aircraft provisions
for electrical bonding of the Engine. |
Propeller Functioning Tests |
Propeller system. Levels of the Propeller vibrations. |
Failure Analysis |
Installation aspects and the assumptions made with respect to any safety system that is required for the Engine and which is outside the applicant’s control. |
Low Temperature Starting Tests, |
Minimum and maximum starting torque. |
TURBINE ENGINES |
|
Freedom from surge |
Operating envelope, i.e. altitude, temperature, aircraft speed. Permissible intake distortion. |
Low-cycle fatigue |
Engine Flight Cycle. |
Continued Rotation |
Aircraft conditions such as airspeed, flight duration and ambient conditions. |
Fuel System |
Fuel Specifications approved for use. Need for aircraft fuel anti-ice means or fuel with anti-ice additives. Assumptions made with respect to the maximum levels of contamination in the fuel supplied to the Engine. |
Oil System |
Oil(s) approved for use. |
Starter System |
Reliance placed on aircraft provisions for any safety system that is outside the applicant’s control. |
Vibration Surveys |
Intake conditions, exhaust conditions. Propeller or thrust reverser effects. |
Contaminated Fuel |
Duration of flight with contaminated fuel following indication of impending filter blockage, and critical temperature for test of AMC E 670 paragraph 2. |
Inclination and Gyroscopic Loads Effects |
Flight manoeuvres. |
Excess Operating Conditions CS-E 700 |
Operating envelope. |
Rotor Locking Test |
Maximum torque from continued flight. |
Thrust or power response CS-E 745 |
Minimum ground idle. Minimum flight idle. Flight envelope. |
Icing Conditions |
Intake conditions and configuration. Aircraft speeds and appropriate Engine powers. Engine ingestion capabilities. |
Ingestion of Rain and Hail |
Aircraft speeds, Engine speeds and altitudes. Intake throat area – Intake configuration. |
Bird strikes |
Aircraft speeds, Engine speeds and altitudes. Intake throat area – Intake configuration. |
Relighting in Flight |
Flight relighting envelope. |
PISTON ENGINES |
|
De-icing and anti-icing |
Temperature rise provided. |
Filters |
Provision to be made in installation. |
Vibration Tests |
Propeller used. |
Water Spray Tests |
Installation details. |
[Amdt No: E/1]
[Amdt No: E/4]
[Amdt No: E/5]
EASA engine certification requires documented assumptions regarding aircraft integration. This includes interfaces, loads, environmental conditions, fuel, oil, and safety systems. Turbine engine assumptions cover surge, fatigue, fuel contamination, icing, and bird strikes. Piston engine assumptions address de-icing, filters, and water spray. These assumptions are crucial for aviation safety.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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