JAR-E 740 Изпитания на издръжливост

(See ACJ E745)

(a) It must be demonstrated, on a test bed,

that:

thrust increases to rated Take-off when the

power or thrust control lever is moved in not

more than one second from the minimum flight

idle position to the maximum position with the

appropriate adverse combination of bleed air

and power extraction to be permitted in the

aeroplane, without overtemperature, surge,

stall, or other detrimental factors occurring to

the Engine.

(2) For rotorcraft Engines, the power

increases to rated Take-off when the power

demand is increased from minimum test bed

idle (see ACJ E 745) to rated Take-off in not

more than one second with the appropriate

adverse combination of bleed air and power

extraction to be permitted in the aircraft,

without overtemperature, surge, stall, or other

detrimental factors occurring to the Engine.

(3) For all Engines, an increase can be

made from 15% of the rated Take-off power or

thrust, to 95% of the rated Take-off power or

thrust in a time not greater than 5 seconds. A

longer time may be accepted if properly

justified. This power or thrust response must

occur from a stabilised static condition using

only the bleed air and accessories loads

necessary to run the Engine.

(b) The minimum response time to 95% of

the rated Take-off power or thrust as a result of

moving the power lever of aeroplane Engines in

not more than one second, from minimum ground

idle and from minimum flight idle positions or,

for rotorcraft Engines, increasing the power

demand in not more than one second from the

minimum test bed idle condition (see ACJ E 745),

starting from a stabilised condition, shall be

measured under the following Engine load

conditions.

(1) No bleed air and power extraction

for aircraft use.

(2) Maximum allowable bleed air and

power extraction for aircraft use.

(3) An intermediate value for bleed air

and power extraction representative of that

which might be used as a maximum for aircraft

during approach to a landing.

(c) If testing facilities are not available to

demonstrate the effects of power extraction

required in JAR–E 745(b)(2) and (3), this shall be

accomplished through appropriate analytical

means.

3. 
   Междинни стойности на отвеждане на въздух и отведена мощност типични за тези които биха се използвали като максимални за ВС по време на подхода за кацане.
   

(с) Ако не се разполага с изпитателно оборудване за демонстриране на въздействието на отвеждане на мощност изискван в JAR-E 745(b)(2) и (3), това трябва да се извърши чрез подходящи аналитични способи.

(a) Twenty-five cold starts (i.e. after the

Engine has been stopped for not less than two

hours) and ten hot starts (i.e. within 15 minutes of

shutting-down after the previous running) shall be

specifically made at evenly distributed intervals

throughout the Endurance Test. Time to light up

and accelerate to idling conditions shall be

recorded.

(b) Ten false starts, each followed by a

normal start immediately on expiry of the

declared drainage period, shall be made at evenly

distributed intervals throughout the Endurance

Test. Failure to start shall be simulated on these

occasions by rendering the ignition circuit

inoperative. Following each false start, the

combustion chambers, air casings, etc., may be

drained, by the normal means provided, of any

fuel which may have accumulated.

(c) At the conclusion of the Endurance Test

the number of starts shall be made up to a total of

one hundred. The additional starts necessary to

make this aggregate may be ‘hot’ or ‘cold’ starts.

All attempted starts including those prescribed in

(b) shall count towards the total, provided that the

normal starting cycle is completed.

(d) In the case of a free power-turbine

Engine for Rotorcraft, each normal start shall be

made with the free power-turbine locked and

followed by a run at Ground Idling Conditions for

three minutes with the free power-turbine

stationary in order to simulate the operation of the

Engine in the rotorcraft with the rotor system

locked.

the Endurance Test shall be recorded. Times to

light up and accelerate to idling conditions shall

be recorded, together with details of all attempted

starts, and the reasons for any failures.