Section 121.323

14 CFR Ch. I (1-1-19 Edition)

the primary ice detection system indicates activation is necessary.
(ii) When the airframe ice protection
system is activated, any other procedures in the Airplane Flight Manual
for operating in icing conditions must
be initiated.
(2) Visual cues of the first sign of ice
formation anywhere on the airplane
and a certificated advisory airframe ice
detection system must be provided.
(i) The airframe ice protection system must be activated when any of the
visual cues are observed or when the
advisory airframe ice detection system
indicates activation is necessary,
whichever occurs first.
(ii) When the airframe ice protection
system is activated, any other procedures in the Airplane Flight Manual
for operating in icing conditions must
be initiated.
(3) If the airplane is not equipped to
comply with the provisions of paragraph (a)(1) or (2) of this section, then
the following apply:
(i) When operating in conditions conducive to airframe icing, the airframe
ice protection system must be activated prior to, and operated during, the
following phases of flight:
(A) Takeoff climb after second segment,
(B) En route climb,
(C) Go-around climb,
(D) Holding,
(E) Maneuvering for approach and
landing, and
(F) Any other operation at approach
or holding airspeeds.
(ii) During any other phase of flight,
the airframe ice protection system
must be activated and operated at the
first sign of ice formation anywhere on
the airplane, unless the Airplane
Flight Manual specifies that the airframe ice protection system should not
be used or provides other operational
instructions.
(iii) Any additional procedures for
operation in conditions conducive to
icing specified in the Airplane Flight
Manual or in the manual required by
Section 121.133 must be initiated.
(b) If the procedures specified in
paragraph (a)(3)(i) of this section are
specifically prohibited in the Airplane
Flight Manual, compliance must be

shown with the requirements of paragraph (a)(1) or (2) of this section.
(c) Procedures necessary for safe operation of the airframe ice protection
system must be established and documented in:
(1) The Airplane Flight Manual for
airplanes that comply with paragraph
(a)(1) or (2) of this section, or
(2) The Airplane Flight Manual or in
the manual required by Section 121.133 for airplanes that comply with paragraph
(a)(3) of this section.
(d) Procedures for operation of the
airframe ice protection system must
include initial activation, operation
after initial activation, and deactivation. Procedures for operation after
initial activation of the ice protection
system must address - 
(1) Continuous operation,
(2) Automatic cycling,
(3) Manual cycling if the airplane is
equipped with an ice detection system
that alerts the flightcrew each time
the ice protection system must be cycled, or
(4) Manual cycling based on a time
interval if the airplane type is not
equipped with features necessary to
implement (d)(1)-(3) of this section.
(e) System installations used to comply with paragraph (a)(1) or (a)(2) of
this section must be approved through
an amended or supplemental type certificate in accordance with part 21 of
this chapter.
[Doc. No. FAA-2009-0675, 78 FR 15876, Mar. 13,
2013]

Section 121.323 Instruments and equipment
for operations at night.
No person may operate an airplane at
night under this part unless it is
equipped with the following instruments and equipment in addition to
those required by SectionSection 121.305 through
121.321 and 121.803:
(a) Position lights.
(b) An anti-collision light.
(c) Two landing lights, except that
only one landing light is required for
nontransport category airplanes type
certificated after December 31, 1964.
(d) Instrument lights providing
enough light to make each required instrument, switch, or similar instrument, easily readable and installed so
that the direct rays are shielded from

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