365
Federal Aviation Administration, DOT
§ 25.1505
corresponding readings (taking into ac-
count correction factors) of the first pi-
lot’s instruments. The correlation
must cover the airspeed range over
which the airplane is to be operated,
the range of altitude to which the air-
plane is limited, and 360 degrees of
heading. Correlation may be estab-
lished on the ground as appropriate.
(d) Each recorder container must—
(1) Be either bright orange or bright
yellow;
(2) Have reflective tape affixed to its
external surface to facilitate its loca-
tion under water; and
(3) Have an underwater locating de-
vice, when required by the operating
rules of this chapter, on or adjacent to
the container which is secured in such
a manner that they are not likely to be
separated during crash impact.
(e) Any novel or unique design or
operational characteristics of the air-
craft shall be evaluated to determine if
any dedicated parameters must be re-
corded on flight recorders in addition
to or in place of existing requirements.
[Amdt. 25–8, 31 FR 127, Jan. 6, 1966, as amend-
ed by Amdt. 25–25, 35 FR 13192, Aug. 19, 1970;
Amdt. 25–37, 40 FR 2577, Jan. 14, 1975; Amdt.
25–41, 42 FR 36971, July 18, 1977; Amdt. 25–65,
53 FR 26144, July 11, 1988; Amdt. 25–124, 73 FR
12563, Mar. 7, 2008; 74 FR 32800, July 9, 2009]
§ 25.1461
Equipment containing high
energy rotors.
(a) Equipment containing high en-
ergy 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, vibra-
tion, abnormal speeds, and abnormal
temperatures. In addition—
(1) Auxiliary rotor cases must be able
to contain damage caused by the fail-
ure of high energy rotor blades; and
(2) Equipment control devices, sys-
tems, and instrumentation must rea-
sonably ensure that no operating limi-
tations affecting the integrity of high
energy rotors will be exceeded in serv-
ice.
(c) It must be shown by test that
equipment containing high energy ro-
tors 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 en-
ergy rotors must be located where
rotor failure will neither endanger the
occupants nor adversely affect contin-
ued safe flight.
[Amdt. 25–41, 42 FR 36971, July 18, 1977]
Subpart G—Operating Limitations
and Information
§ 25.1501
General.
(a) Each operating limitation speci-
fied in §§ 25.1503 through 25.1533 and
other limitations and information nec-
essary for safe operation must be es-
tablished.
(b) The operating limitations and
other information necessary for safe
operation must be made available to
the crewmembers as prescribed in
§§ 25.1541 through 25.1587.
[Amdt. 25–42, 43 FR 2323, Jan. 16, 1978]
O
PERATING
L
IMITATIONS
§ 25.1503
Airspeed limitations: general.
When airspeed limitations are a func-
tion of weight, weight distribution, al-
titude, or Mach number, limitations
corresponding to each critical com-
bination of these factors must be estab-
lished.
§ 25.1505
Maximum operating limit
speed.
The maximum operating limit speed
(
V
MO
/
M
MO
airspeed or Mach Number,
whichever is critical at a particular al-
titude) is a speed that may not be de-
liberately exceeded in any regime of
flight (climb, cruise, or descent), unless
a higher speed is authorized for flight
test or pilot training operations.
V
MO
/
M
MO
must be established so that it is
not greater than the design cruising
speed
V
C
and so that it is sufficiently
below
V
D
/
M
D
or
V
DF
/
M
DF,
to make it
highly improbable that the latter
speeds will be inadvertently exceeded
in operations. The speed margin be-
tween
V
MO
/
M
MO
and
V
D
/
M
D
or
V
DF
M/
DF
may not be less than that determined
under § 25.335(b) or found necessary dur-
ing the flight tests conducted under
§ 25.253.
[Amdt. 25–23, 35 FR 5680, Apr. 8, 1970]
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