CS-VLA 1047 Cooling test procedure for reciprocating
engine aeroplanes
ED Decision 2003/18/RM
(a) To determine compliance with the requirement of CS-VLA 1041, a cooling test must be carried out as follows:
(1) Engine temperatures must be stabilised in flight with the engine at not less than 75% of maximum continuous power.
(2) After temperatures have stabilised, a climb must be begun at the lowest practical altitude and continued for one minute with the engine at take-off power.
(3) At the end of one minute, the climb must be continued at maximum continuous power for at least 5 minutes after the occurrence of the highest temperature recorded.
(4) For supercharged engines, the supercharger must be operated through that part of climb profile for which operation with the supercharger is requested and in a manner consistent with its intended operation.
(b) The climb required in sub-paragraph (a) of this paragraph must be conducted at a speed not more than the best rate-of-climb speed with maximum continuous power.
(c) The maximum anticipated air temperature (hot-day conditions) is 38°C at sealevel. Above sea-level, the temperature decreases with a temperature gradient of 2°C per 1 000 ft, altitude. If the tests are conducted under conditions deviating from this value, the recorded temperatures must be corrected according to sub-paragraph (d) of this paragraph, unless a more rational method is applied.
(d) The temperatures of the engine fluids and of the powerplant components (with the exception of cylinder barrels) must be corrected by adding to them the difference between the maximum ambient anticipated air temperature and the temperature of the ambient air at the time of the first occurrence of the maximum component or fluid temperature recorded during the cooling tests.
(e) Cylinder barrel temperatures must be corrected by adding to them 0.7 times the difference between the maximum ambient atmospheric temperature and the temperature of the ambient air at the time of the first occurrence of the maximum cylinder barrel temperature recorded during the cooling test.
EASA VLA Cooling Test Summary: Very Light Aeroplanes with reciprocating engines require cooling tests to ensure engine temperatures remain safe. The test involves stabilized flight, followed by climbs at takeoff and maximum continuous power. Temperature corrections are needed based on ambient air temperature deviations from hot-day conditions to validate engine cooling performance.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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