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Federal Aviation Regulations

Sec. 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 §29.309;

(ii) 0.9 times the maximum speed shown under §§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) VNEmay 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-offVNEdenoted asVNE(power-off) may be established at a speed less thanVNEestablished 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-onVNEand the speed used in meeting the requirements of—

(i) §29.67(a)(3) for Category A helicopters;

(ii) §29.65(a) for Category B helicopters, except multi-engine helicopters meeting the requirements of §29.67(b); and

(iii) §29.67(b) for multi-engine Category B helicopters meeting the requirements of §29.67(b).

(2)VNE(power-off) is—

(i) A constant airspeed;

(ii) A constant amount less than power-onVNE;or

(iii) A constant airspeed for a portion of the altitude range for which certification is requested, and a constant amount less than power-onVNEfor 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]

NEXT: Sec. 29.1509 - Rotor speed.
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