CS-E 390 Acceleration Tests

(a)The tests of CS-E 390(a)(1) and (2) must be carried out at the end of the endurance test of CS-E 440 without heated intake air and repeated, when applicable, with intake air heated to the maximum temperature likely to be experienced at any operating condition within the flight envelope.

(1)For all Engines, except two-speed supercharged Engines, five accelerations must be made from idling conditions to Take-off Power.

(2)For two-speed supercharged Engines, five accelerations must be made from idling conditions up to each condition

(i)To Take-off Power with supercharger in low gear

(ii)To Maximum Continuous Power with supercharger in high gear.

(b)The Engine shall respond without hesitation and accelerate smoothly throughout the range, when the power lever is moved from the minimum flight idle position to the Take-off or Maximum Continuous position, as appropriate, in not more than one second.

(c)If the Engine is to be approved for use with a propeller with variable or adjustable pitch, for the tests of CS-E 390(a) the propeller pitch shall be set such that the Engine will produce not less than rated Takeoff power at the Engine rotational speed used to define the Take-off rating (see CS-E 40(h)).

(d)Each acceleration (except for those with a supercharger in high gear) shall be made starting from the minimum temperatures for acceleration from idle to be declared in the operating limitations. Each acceleration with a supercharger in high gear shall be made from ambient conditions.