322
14 CFR Ch. I (1–1–14 Edition)
§ 23.1505
the crewmembers as prescribed in
§§ 23.1541 through 23.1589.
[Amdt. 23–21, 43 FR 2319, Jan. 16, 1978]
§ 23.1505
Airspeed limitations.
(a) The never-exceed speed
V
NE
must
be established so that it is—
(1) Not less than 0.9 times the min-
imum value of
V
D
allowed under
§ 23.335; and
(2) Not more than the lesser of—
(i) 0.9
V
D
established under § 23.335; or
(ii) 0.9 times the maximum speed
shown under § 23.251.
(b) The maximum structural cruising
speed
V
NO
must be established so that
it is—
(1) Not less than the minimum value
of
V
C
allowed under § 23.335; and
(2) Not more than the lesser of—
(i)
V
C
established under § 23.335; or
(ii) 0.89
V
NE
established under para-
graph (a) of this section.
(c)(1) Paragraphs (a) and (b) of this
section do not apply to turbine air-
planes or to airplanes for which a de-
sign diving speed V
D
/M
D
is established
under § 23.335(b)(4). For those airplanes,
a maximum operating limit speed (V
MO
/
M
MO
airspeed or Mach number, which-
ever is critical at a particular altitude)
must be established as a speed that
may not be deliberately exceeded in
any regime of flight (climb, cruise, or
descent) unless a higher speed is au-
thorized for flight test or pilot training
operations.
(2) V
MO
/M
MO
must be established so
that it is not greater than the design
cruising speed V
C
/M
C
and so that it is
sufficiently below V
D
/M
D
, or V
DF
/M
DF
for jets, and the maximum speed shown
under § 23.251 to make it highly improb-
able that the latter speeds will be inad-
vertently exceeded in operations.
(3) The speed margin between V
MO
/
M
MO
and V
D
/M
D
, or V
DF
/M
DF
for jets,
may not be less than that determined
under § 23.335(b), or the speed margin
found necessary in the flight tests con-
ducted under § 23.253.
[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964, as
amended by Amdt. 23–7, 34 FR 13096, Aug. 13,
1969; Amdt. 23–62, 76 FR 75762, Dec. 2, 2011]
§ 23.1507
Operating maneuvering
speed.
The maximum operating maneu-
vering speed, V
O
, must be established
as an operating limitation. V
O
is a se-
lected speed that is not greater than
V
S
√
n established in § 23.335(c).
[Doc. No. 26269, 58 FR 42165, Aug. 6, 1993]
§ 23.1511
Flap extended speed.
(a) The flap extended speed
V
FE
must
be established so that it is—
(1) Not less than the minimum value
of V
F
allowed in § 23.345(b); and
(2) Not more than V
F
established
under § 23.345(a), (c), and (d).
(b) Additional combinations of flap
setting, airspeed, and engine power
may be established if the structure has
been proven for the corresponding de-
sign conditions.
[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964; 30
FR 258, Jan. 9, 1965, as amended by Amdt. 23–
50, 61 FR 5192, Feb. 9, 1996]
§ 23.1513
Minimum control speed.
The minimum control speed
V
MC,
de-
termined under § 23.149, must be estab-
lished as an operating limitation.
§ 23.1519
Weight and center of gravity.
The weight and center of gravity lim-
itations determined under § 23.23 must
be established as operating limitations.
§ 23.1521
Powerplant limitations.
(a)
General. The powerplant limita-
tions prescribed in this section must be
established so that they do not exceed
the corresponding limits for which the
engines or propellers are type certifi-
cated. In addition, other powerplant
limitations used in determining com-
pliance with this part must be estab-
lished.
(b)
Takeoff operation. The powerplant
takeoff operation must be limited by—
(1) The maximum rotational speed
(rpm);
(2) The maximum allowable manifold
pressure (for reciprocating engines);
(3) The maximum allowable gas tem-
perature (for turbine engines);
(4) The time limit for the use of the
power or thrust corresponding to the
limitations established in paragraphs
(b)(1) through (3) of this section; and
(5) The maximum allowable cylinder
head (as applicable), liquid coolant and
oil temperatures.
(c)
Continuous operation. The contin-
uous operation must be limited by—
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