пРИЛОЖЕНИЕ В Критерии за летателна годност при полет на вертолета по прибори

(a) VYI means instrument climb speed,

utilised instead of VY for compliance with the

climb requirements for instrument flight.

(b) VNEI means instrument flight neverexceed

speed, utilised instead of VNE for

compliance with maximum limit speed

requirements for instrument flight.

(c) VMINI means instrument flight minimum

speed, utilised in complying with minimum limit

speed requirements for instrument flight.

cyclic, collective, and directional control forces to

zero at all approved IFR airspeeds, power

settings, and configurations appropriate to the

type.

Трябва да е възможно балансирането на цикличните, общите и насочените сили на управление до нула при всички одобрени скорости при полети по прибори, IFR , режими на мощност и конфигурации, подходящи за дадения тип.

(a) General. The helicopter must possess

positive static longitudinal control force stability

at critical combinations of weight and centre of

gravity at the conditions specified in subparagraphs

IV (b) to (f) of this Appendix. The

stick force must vary with speed so that any

substantial speed change results in a stick force

clearly perceptible to the pilot. The airspeed must

return to within 10% of the trim speed when the

control force is slowly released for each trim

condition specified in sub-paragraphs IV (b) to (f)

of this Appendix.

(b) Climb. Stability must be shown in climb

throughout the speed range 20 knots either side of

trim with –

(1) The helicopter trimmed at VYI ;

(2) Landing gear retracted (if

retractable); and

(3) Power required for limit climb rate

(at least 1000 fpm) at VYI or maximum

continuous power, whichever is less.

(c) Cruise. Stability must be shown

throughout the speed range from 0.7 to 1.1 VH or

VNEI, whichever is lower, not to exceed ± 20 knots

from trim with –

(1) The helicopter trimmed and power

adjusted for level flight at 0.9 VH or 0.9 VNEI,

whichever is lower; and

(2) Landing gear retracted (if

retractable).

(d) Slow cruise. Stability must be shown

throughout the speed range from 0.9 VMINI to

1.3 VMINI or 20 knots above trim speed, whichever

is greater, with –

(1) The helicopter trimmed and power

adjusted for level flight at 1.1 VMINI; and

(2) Landing gear retracted (if

retractable).

(e) Descent. Stability must be shown

throughout the speed range 20 knots either side of

trim with –

(1) The helicopter trimmed at 0.8 VH or

0.8 VNEI (or 0.8 VLE for the landing gear

extended case), whichever is lower;

(2) Power required for l000 fpm

descent at trim speed; and

(3) Landing gear extended and

retracted, if applicable.

(f) Approach. Stability must be shown

throughout the speed range from 0.7 times the

minimum recommended approach speed to

20 knots above the maximum recommended

approach speed with –

(1) The helicopter trimmed at the

recommended approach speed or speeds;

(2) Landing gear extended and

retracted, if applicable; and

(3) Power required to maintain a 3°

glide path and power required to maintain the

steepest approach gradient for which approval

is requested.