220 

14 CFR Ch. I (1–1–19 Edition) 

§ 121.629 

authorizing use of the Minimum Equip-
ment 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 re-
quired by the airworthiness require-
ments under which the airplane is type 
certificated and which are essential for 
safe operations under all operating 
conditions. 

(2) Instruments and equipment re-

quired by an airworthiness directive to 
be in operable condition unless the air-
worthiness directive provides other-
wise. 

(3) Instruments and equipment re-

quired for specific operations by this 
part. 

(c) Notwithstanding paragraphs (b)(1) 

and (b)(3) of this section, an airplane 
with inoperable instruments or equip-
ment may be operated under a special 
flight permit under §§ 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] 

§ 121.629

Operation in icing condi-

tions. 

(a) No person may dispatch or release 

an aircraft, continue to operate an air-
craft 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 ad-
versely affect the safety of the flight. 

(b) No person may take off an air-

craft when frost, ice, or snow is adher-
ing to the wings, control surfaces, pro-
pellers, 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 au-
thorized by the Administrator. 

(c) Except as provided in paragraph 

(d) of this section, no person may dis-
patch, 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, un-
less the certificate holder has an ap-

proved ground deicing/anti-icing pro-
gram in its operations specifications 
and unless the dispatch, release, and 
takeoff comply with that program. The 
approved ground deicing/anti-icing pro-
gram must include at least the fol-
lowing items: 

(1) A detailed description of— 
(i) How the certificate holder deter-

mines that conditions are such that 
frost, ice, or snow may reasonably be 
expected to adhere to the aircraft and 
that ground deicing/anti-icing oper-
ational procedures must be in effect; 

(ii) Who is responsible for deciding 

that ground deicing/anti-icing oper-
ational procedures must be in effect; 

(iii) The procedures for implementing 

ground deicing/anti-icing operational 
procedures; 

(iv) The specific duties and respon-

sibilities of each operational position 
or group responsible for getting the 
aircraft safely airborne while ground 
deicing/anti-icing operational proce-
dures 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 re-
quirements 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 proce-

dures, 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 charac-
teristics. 

(v) Types and characteristics of deic-

ing/anti-icing fluids. 

(vi) Cold weather preflight inspection 

procedures; 

(vii) Techniques for recognizing con-

tamination 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 

VerDate Sep<11>2014 

08:20 May 17, 2019

Jkt 247048

PO 00000

Frm 00230

Fmt 8010

Sfmt 8010

Y:\SGML\247048.XXX

247048