Section 121.629

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

authorizing use of the Minimum Equipment List.
(b) The following instruments and
equipment may not be included in the
Minimum Equipment List:
(1) Instruments and equipment that
are either specifically or otherwise required by the airworthiness requirements under which the airplane is type
certificated and which are essential for
safe operations under all operating
conditions.
(2) Instruments and equipment required by an airworthiness directive to
be in operable condition unless the airworthiness directive provides otherwise.
(3) Instruments and equipment required for specific operations by this
part.
(c) Notwithstanding paragraphs (b)(1)
and (b)(3) of this section, an airplane
with inoperable instruments or equipment may be operated under a special
flight permit under SectionSection 21.197 and 21.199
of this chapter.
[Doc. No. 25780, 56 FR 12310, Mar. 22, 1991;
Amdt. 121-222, 56 FR 14290, Apr. 8, 1991; Amdt.
121-253, 61 FR 2615, Jan. 26, 1996; Docket
FAA-2018-0119, Amdt. 121-380, 83 FR 9172,
Mar. 5, 2018]

Section 121.629 Operation in icing conditions.
(a) No person may dispatch or release
an aircraft, continue to operate an aircraft en route, or land an aircraft when
in the opinion of the pilot in command
or aircraft dispatcher (domestic and
flag operations only), icing conditions
are expected or met that might adversely affect the safety of the flight.
(b) No person may take off an aircraft when frost, ice, or snow is adhering to the wings, control surfaces, propellers, engine inlets, or other critical
surfaces of the aircraft or when the
takeoff would not be in compliance
with paragraph (c) of this section.
Takeoffs with frost under the wing in
the area of the fuel tanks may be authorized by the Administrator.
(c) Except as provided in paragraph
(d) of this section, no person may dispatch, release, or take off an aircraft
any time conditions are such that
frost, ice, or snow may reasonably be
expected to adhere to the aircraft, unless the certificate holder has an ap-

proved ground deicing/anti-icing program in its operations specifications
and unless the dispatch, release, and
takeoff comply with that program. The
approved ground deicing/anti-icing program must include at least the following items:
(1) A detailed description of - 
(i) How the certificate holder determines that conditions are such that
frost, ice, or snow may reasonably be
expected to adhere to the aircraft and
that ground deicing/anti-icing operational procedures must be in effect;
(ii) Who is responsible for deciding
that ground deicing/anti-icing operational procedures must be in effect;
(iii) The procedures for implementing
ground deicing/anti-icing operational
procedures;
(iv) The specific duties and responsibilities of each operational position
or group responsible for getting the
aircraft safely airborne while ground
deicing/anti-icing operational procedures are in effect.
(2) Initial and annual recurrent
ground training and testing for flight
crewmembers and qualification for all
other affected personnel (e.g., aircraft
dispatchers, ground crews, contract
personnel) concerning the specific requirements of the approved program
and each person-s responsibilities and
duties under the approved program,
specifically covering the following
areas:
(i) The use of holdover times.
(ii) Aircraft deicing/anti-icing procedures, including inspection and check
procedures and responsibilities.
(iii) Communications procedures.
(iv) Aircraft surface contamination
(i.e., adherence of frost, ice, or snow)
and critical area identification, and
how contamination adversely affects
aircraft performance and flight characteristics.
(v) Types and characteristics of deicing/anti-icing fluids.
(vi) Cold weather preflight inspection
procedures;
(vii) Techniques for recognizing contamination on the aircraft.
(3) The certificate holder-s holdover
timetables and the procedures for the
use of these tables by the certificate
holder-s personnel. Holdover time is
the estimated time deicing/anti-icing

220

VerDate Sep<11>2014

08:20 May 17, 2019

Jkt 247048

PO 00000

Frm 00230

Fmt 8010

Sfmt 8010

Y:\SGML\247048.XXX

247048