Federal Aviation Administration, DOT
the crewmembers as prescribed
SectionSection 29.1541 through 29.1589.

Section 29.1517

in

(Secs. 313(a), 601, 603, 604, and 605 of the Federal Aviation Act of 1958 (49 U.S.C. 1354(a),
1421, 1423, 1424, and 1425); and sec. 6(c), Dept.
of Transportation Act (49 U.S.C. 1655(c)))
[Amdt. 29-15, 43 FR 2327, Jan. 16, 1978]

OPERATING LIMITATIONS

spaschal on DSK3GDR082PROD with CFR

Section 29.1503 Airspeed limitations: general.
(a) An operating speed range must be
established.
(b) When airspeed limitations are a
function of weight, weight distribution,
altitude, rotor speed, power, or other
factors,
airspeed
limitations
corresponding with the critical combinations of these factors must be established.
Section 29.1505 Never-exceed speed.
(a) The never-exceed speed, VNE, must
be established so that it is - 
(1) Not less than 40 knots (CAS); and
(2) Not more than the lesser of - 
(i) 0.9 times the maximum forward
speeds established under Section 29.309;
(ii) 0.9 times the maximum speed
shown under SectionSection 29.251 and 29.629; or
(iii) 0.9 times the maximum speed
substantiated for advancing blade tip
mach number effects under critical altitude conditions.
(b) VNE may vary with altitude,
r.p.m., temperature, and weight, if - 
(1) No more than two of these variables (or no more than two instruments integrating more than one of
these variables) are used at one time;
and
(2) The ranges of these variables (or
of the indications on instruments integrating more than one of these variables) are large enough to allow an
operationally practical and safe variation of VNE.
(c) For helicopters, a stabilized
power-off VNE denoted as VNE (poweroff) may be established at a speed less
than VNE established pursuant to paragraph (a) of this section, if the following conditions are met:
(1) VNE (power-off) is not less than a
speed midway between the power-on
VNE and the speed used in meeting the
requirements of - 
(i) Section 29.67(a)(3) for Category A helicopters;

(ii) Section 29.65(a) for Category B helicopters, except multi-engine helicopters meeting the requirements of
Section 29.67(b); and
(iii) Section 29.67(b) for multi-engine Category B helicopters meeting the requirements of Section 29.67(b).
(2) VNE (power-off) is - 
(i) A constant airspeed;
(ii) A constant amount less than
power-on VNESection or
(iii) A constant airspeed for a portion
of the altitude range for which certification is requested, and a constant
amount less than power-on VNE for the
remainder of the altitude range.
(Secs. 313(a), 601, 603, 604, and 605 of the Federal Aviation Act of 1958 (49 U.S.C. 1354(a),
1421, 1423, 1424, and 1425); and sec. 6(c), Dept.
of Transportation Act (49 U.S.C. 1655(c)))
[Amdt. 29-3, 33 FR 971, Jan. 26, 1968, as
amended by Amdt. 29-15, 43 FR 2327, Jan. 16,
1978; Amdt. 29-24, 49 FR 44440, Nov. 6, 1984]

Section 29.1509 Rotor speed.
(a) Maximum power-off (autorotation).
The maximum power-off rotor speed
must be established so that it does not
exceed 95 percent of the lesser of - 
(1) The maximum design r.p.m. determined under Section 29.309(b); and
(2) The maximum r.p.m. shown during the type tests.
(b) Minimum power-off. The minimum
power-off rotor speed must be established so that it is not less than 105
percent of the greater of - 
(1) The minimum shown during the
type tests; and
(2) The minimum determined by design substantiation.
(c) Minimum power-on. The minimum
power-on rotor speed must be established so that it is - 
(1) Not less than the greater of - 
(i) The minimum shown during the
type tests; and
(ii) The minimum determined by design substantiation; and
(2) Not more than a value determined
under Section 29.33 (a)(1) and (c)(1).
Section 29.1517 Limiting height-speed envelope.
For Category A rotorcraft, if a range
of heights exists at any speed, including zero, within which it is not possible
to make a safe landing following power
failure, the range of heights and its

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