CS 22.1047  Cooling test procedure for reciprocating engine powered sailplanes

CAA ORS9 Decision No. 1

(a) To determine compliance with the requirement of CS 22.1041, a cooling test must be carried out as follows: 

(1) Engine temperatures must be stabilized in flight with the engine at not less than 75% of maximum continuous power. 

(2) After temperatures have stabilized, 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. 

(b) The climb required in (a) 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 sea-level. Above sea-level, the temperature decreases with a temperature gradient of 6.5°C per 1 000 m altitude. If the tests are conducted under conditions deviating from this value, the recorded temperatures must be corrected according to (d), unless a more rational method is applied. 

(d) The temperatures of the engine fluids and of the power-plant 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 recorded component or fluid temperature.