Federal Aviation Administration, DOT

Section 27.1505

this section and the requirements for
cockpit voice recorders under this part
are met.
[Amdt. 27-22, 53 FR 26144, July 11, 1988, as
amended by Amdt. 27-43, 73 FR 12564, Mar. 7,
2008; 74 FR 32800, July 9, 2009; Amdt. 27-45, 75
FR 17045, Apr. 5, 2010]

the crewmembers as prescribed
SectionSection 27.1541 through 27.1589.

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) of the
Dept. of Transportation Act (49 U.S.C.
1655(c)))
[Amdt. 27-14, 43 FR 2325, Jan. 16, 1978]

Section 27.1461 Equipment containing high
energy rotors.
(a) Equipment containing high energy rotors must meet paragraph (b),
(c), or (d) of this section.
(b) High energy rotors contained in
equipment must be able to withstand
damage caused by malfunctions, vibration, abnormal speeds, and abnormal
temperatures. In addition - 
(1) Auxiliary rotor cases must be able
to contain damage caused by the failure of high energy rotor blades; and
(2) Equipment control devices, systems, and instrumentation must reasonably ensure that no operating limitations affecting the integrity of high
energy rotors will be exceeded in service.
(c) It must be shown by test that
equipment containing high energy rotors can contain any failure of a high
energy rotor that occurs at the highest
speed obtainable with the normal speed
control devices inoperative.
(d) Equipment containing high energy rotors must be located where
rotor failure will neither endanger the
occupants nor adversely affect continued safe flight.
[Amdt. 27-2, 33 FR 964, Jan. 26, 1968]

Subpart G - Operating Limitations
and Information

spaschal on DSK3GDR082PROD with CFR

Section 27.1501

General.

(a) Each operating limitation specified in SectionSection 27.1503 through 27.1525 and
other limitations and information necessary for safe operation must be established.
(b) The operating limitations and
other information necessary for safe
operation must be made available to

OPERATING LIMITATIONS
Section 27.1503 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 27.1505 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 27.309;
(ii) 0.9 times the maximum speed
shown under SectionSection 27.251 and 27.629; or
(iii) 0.9 times the maximum speed
substantiated for advancing blade tip
mach number effects.
(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 27.65(b) for single engine helicopters; and

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