Federal Aviation Administration, DOT

Section 125.224

rate of climb, flight attitude instrument system, or wing, except that
takeoffs may be made with frost under
the wing in the area of the fuel tanks
if authorized by the FAA.
(b) No certificate holder may authorize an airplane to take off and no pilot
may take off an airplane any time conditions are such that frost, ice, or snow
may reasonably be expected to adhere
to the airplane unless the pilot has
completed the testing required under
Section 125.287(a)(9) and unless one of the following requirements is met:
(1)
A
pretakeoff
contamination
check, that has been established by the
certificate holder and approved by the
Administrator for the specific airplane
type, has been completed within 5 minutes prior to beginning takeoff. A pretakeoff contamination check is a check
to make sure the wings and control
surfaces are free of frost, ice, or snow.
(2) The certificate holder has an approved alternative procedure and under
that procedure the airplane is determined to be free of frost, ice, or snow.
(3) The certificate holder has an approved deicing/anti-icing program that
complies with Section 121.629(c) of this chapter and the takeoff complies with that
program.
(c) No pilot may fly under IFR into
known or forecast light or moderate
icing conditions, or under VFR into
known light or moderate icing conditions, unless - 
(1) The aircraft has functioning deicing or anti-icing equipment protecting
each propeller, windshield, wing, stabilizing or control surface, and each airspeed, altimeter, rate of climb, or
flight attitude instrument system;
(2) The airplane has ice protection
provisions that meet appendix C of this
part; or
(3) The airplane meets transport category airplane type certification provisions, including the requirements for
certification for flight in icing conditions.
(d) Except for an airplane that has
ice protection provisions that meet appendix C of this part or those for transport category airplane type certification, no pilot may fly an airplane
into known or forecast severe icing
conditions.

(e) If current weather reports and
briefing information relied upon by the
pilot in command indicate that the
forecast icing condition that would
otherwise prohibit the flight will not
be encountered during the flight because of changed weather conditions
since the forecast, the restrictions in
paragraphs (b) and (c) of this section
based on forecast conditions do not
apply.
[45 FR 67235, Oct. 9, 1980, as amended by
Amdt. 125-18, 58 FR 69629, Dec. 30, 1993; Amdt.
125-58, 74 FR 62696, Dec. 1, 2009]

Section 125.223 Airborne
weather
equipment requirements.

(a) No person may operate an airplane governed by this part in passenger-carrying operations unless approved airborne weather radar equipment is installed in the airplane.
(b) No person may begin a flight
under IFR or night VFR conditions
when current weather reports indicate
that thunderstorms, or other potentially hazardous weather conditions
that can be detected with airborne
weather radar equipment, may reasonably be expected along the route to be
flown, unless the airborne weather
radar equipment required by paragraph
(a) of this section is in satisfactory operating condition.
(c) If the airborne weather radar
equipment becomes inoperative en
route, the airplane must be operated
under the instructions and procedures
specified for that event in the manual
required by Section 125.71.
(d) This section does not apply to airplanes used solely within the State of
Hawaii, within the State of Alaska,
within that part of Canada west of longitude 130 degrees W, between latitude
70 degrees N, and latitude 53 degrees N,
or during any training, test, or ferry
flight.
(e) Without regard to any other provision of this part, an alternate electrical power supply is not required for
airborne weather radar equipment.
Section 125.224

Collision avoidance system.

Effective January 1, 2005, any airplane you operate under this part 125
must be equipped and operated according to the following table:

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