Federal Aviation Administration, DOT

Section 91.121

(d) Overtaking. Each aircraft or vessel
that is being overtaken has the rightof-way, and the one overtaking shall
alter course to keep well clear.
(e) Special circumstances. When aircraft, or an aircraft and a vessel, approach so as to involve risk of collision, each aircraft or vessel shall proceed with careful regard to existing
circumstances, including the limitations of the respective craft.
Section 91.117 Aircraft speed.
(a) Unless otherwise authorized by
the Administrator, no person may operate an aircraft below 10,000 feet MSL
at an indicated airspeed of more than
250 knots (288 m.p.h.).
(b) Unless otherwise authorized or required by ATC, no person may operate
an aircraft at or below 2,500 feet above
the surface within 4 nautical miles of
the primary airport of a Class C or
Class D airspace area at an indicated
airspeed of more than 200 knots (230
mph.). This paragraph (b) does not
apply to any operations within a Class
B airspace area. Such operations shall
comply with paragraph (a) of this section.
(c) No person may operate an aircraft
in the airspace underlying a Class B
airspace area designated for an airport
or in a VFR corridor designated
through such a Class B airspace area,
at an indicated airspeed of more than
200 knots (230 mph).
(d) If the minimum safe airspeed for
any particular operation is greater
than the maximum speed prescribed in
this section, the aircraft may be operated at that minimum speed.

kpayne on VMOFRWIN702 with $$_JOB

[Doc. No. 18334, 54 FR 34292, Aug. 18, 1989, as
amended by Amdt. 91-219, 55 FR 34708, Aug.
24, 1990; Amdt. 91-227, 56 FR 65657, Dec. 17,
1991; Amdt. 91-233, 58 FR 43554, Aug. 17, 1993]

Section 91.119 Minimum safe altitudes: General.
Except when necessary for takeoff or
landing, no person may operate an aircraft below the following altitudes:
(a) Anywhere. An altitude allowing, if
a power unit fails, an emergency landing without undue hazard to persons or
property on the surface.
(b) Over congested areas. Over any
congested area of a city, town, or settlement, or over any open air assembly

of persons, an altitude of 1,000 feet
above the highest obstacle within a
horizontal radius of 2,000 feet of the
aircraft.
(c) Over other than congested areas. An
altitude of 500 feet above the surface,
except over open water or sparsely populated areas. In those cases, the aircraft may not be operated closer than
500 feet to any person, vessel, vehicle,
or structure.
(d) Helicopters, powered parachutes,
and weight-shift-control aircraft. If the
operation is conducted without hazard
to persons or property on the surface - 
(1) A helicopter may be operated at
less than the minimums prescribed in
paragraph (b) or (c) of this section, provided each person operating the helicopter complies with any routes or altitudes specifically prescribed for helicopters by the FAA; and
(2) A powered parachute or weightshift-control aircraft may be operated
at less than the minimums prescribed
in paragraph (c) of this section.
[Doc. No. 18334, 54 FR 34294, Aug. 18, 1989, as
amended by Amdt. 91-311, 75 FR 5223, Feb. 1,
2010]

Section 91.121

Altimeter settings.

(a) Each person operating an aircraft
shall maintain the cruising altitude or
flight level of that aircraft, as the case
may be, by reference to an altimeter
that is set, when operating - 
(1) Below 18,000 feet MSL, to - 
(i) The current reported altimeter
setting of a station along the route and
within 100 nautical miles of the aircraft;
(ii) If there is no station within the
area prescribed in paragraph (a)(1)(i) of
this section, the current reported altimeter setting of an appropriate available station; or
(iii) In the case of an aircraft not
equipped with a radio, the elevation of
the departure airport or an appropriate
altimeter setting available before departure; or
(2) At or above 18,000 feet MSL, to
29.92- Hg.
(b) The lowest usable flight level is
determined by the atmospheric pressure in the area of operation as shown
in the following table:

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