106 

14 CFR Ch. I (1–1–24 Edition) 

§ 121.203 

(4) Terrain features. 
(5) Air traffic control problems. 
(6) Any other operational factors 

that affect the operation. 

(c) For the purposes of this section, it 

is assumed that— 

(1) The critical engine is inoperative; 
(2) The propeller of the inoperative 

engine is in the minimum drag posi-
tion; 

(3) The wing flaps and landing gear 

are in the most favorable position; 

(4) The operating engines are oper-

ating at the maximum continuous 
power available; 

(5) The airplane is operating in stand-

ard atmosphere; and 

(6) The weight of the airplane is pro-

gressively reduced by the anticipated 
consumption of fuel and oil. 

§ 121.203 Nontransport category air-

planes: Landing limitations: Des-
tination airport. 

(a) No person operating a non-

transport category airplane may take 
off that airplane at a weight that— 

(1) Allowing for anticipated consump-

tion of fuel and oil, is greater than the 
weight that would allow a full stop 
landing within 60 percent of the effec-
tive length of the most suitable run-
way at the destination airport; and 

(2) Is greater than the weight allow-

able if the landing is to be made on the 
runway— 

(i) With the greatest effective length 

in still air; and 

(ii) Required by the probable wind, 

taking into account not more than 50 
percent of the headwind component or 
not less than 150 percent of the tail-
wind component. 

(b) For the purposes of this section, 

it is assumed that— 

(1) The airplane passes directly over 

the intersection of the obstruction 
clearance plane and the runway at a 
height of 50 feet in a steady gliding ap-
proach at a true indicated airspeed of 
at least 1.3 

V

So

; 

(2) The landing does not require ex-

ceptional pilot skill; and 

(3) The airplane is operating in stand-

ard atmosphere. 

§ 121.205 Nontransport category air-

planes: Landing limitations: Alter-
nate airport. 

No person may list an airport as an 

alternate airport in a dispatch or flight 
release for a nontransport category air-
plane unless that airplane (at the 
weight anticipated at the time of ar-
rival) based on the assumptions con-
tained in § 121.203, can be brought to a 
full stop landing within 70 percent of 
the effective length of the runway. 

§ 121.207 Provisionally certificated air-

planes: Operating limitations. 

In addition to the limitations in 

§ 91.317 of this chapter, the following 
limitations apply to the operation of 
provisionally certificated airplanes by 
certificate holders: 

(a) In addition to crewmembers, each 

certificate holder may carry on such an 
airplane only those persons who are 
listed in § 121.547(c) or who are specifi-
cally authorized by both the certificate 
holder and the Administrator. 

(b) Each certificate holder shall keep 

a log of each flight conducted under 
this section and shall keep accurate 
and complete records of each inspec-
tion made and all maintenance per-
formed on the airplane. The certificate 
holder shall make the log and records 
made under this section available to 
the manufacturer and the Adminis-
trator. 

[Doc. No. 28154, 61 FR 2611, Jan. 26, 1996] 

Subpart J—Special Airworthiness 

Requirements 

S

OURCE

: Docket No. 6258, 29 FR 19202, Dec. 

31, 1964, unless otherwise noted. 

§ 121.211 Applicability. 

(a) This subpart prescribes special 

airworthiness requirements applicable 
to certificate holders as stated in para-
graphs (b) through (e) of this section. 

(b) Except as provided in paragraph 

(d) of this section, each airplane type 
certificated under Aero Bulletin 7A or 
part 04 of the Civil Air Regulations in 
effect before November 1, 1946 must 
meet the special airworthiness require-
ments in §§ 121.215 through 121.283. 

107 

Federal Aviation Administration, DOT 

§ 121.221 

(c) Each certificate holder must com-

ply with the requirements of §§ 121.285 
through 121.291. 

(d) If the Administrator determines 

that, for a particular model of airplane 
used in cargo service, literal compli-
ance with any requirement under para-
graph (b) of this section would be ex-
tremely difficult and that compliance 
would not contribute materially to the 
objective sought, he may require com-
pliance only with those requirements 
that are necessary to accomplish the 
basic objectives of this part. 

(e) No person may operate under this 

part a nontransport category airplane 
type certificated after December 31, 
1964, unless the airplane meets the spe-
cial airworthiness requirements in 
§ 121.293. 

[Doc. No. 28154, 60 FR 65928, Dec. 20, 1995] 

§ 121.213 [Reserved] 

§ 121.215 Cabin interiors. 

(a) Except as provided in § 121.312, 

each compartment used by the crew or 
passengers must meet the require-
ments of this section. 

(b) Materials must be at least flash 

resistant. 

(c) The wall and ceiling linings and 

the covering of upholstering, floors, 
and furnishings must be flame resist-
ant. 

(d) Each compartment where smok-

ing is to be allowed must be equipped 
with self-contained ash trays that are 
completely removable and other com-
partments must be placarded against 
smoking. 

(e) Each receptacle for used towels, 

papers, and wastes must be of fire-re-
sistant material and must have a cover 
or other means of containing possible 
fires started in the receptacles. 

[Doc. No. 6258, 29 FR 19202, Dec. 31, 1964, as 
amended by Amdt. 121–84, 37 FR 3974, Feb. 24, 
1972] 

§ 121.217 Internal doors. 

In any case where internal doors are 

equipped with louvres or other ven-
tilating means, there must be a means 
convenient to the crew for closing the 
flow of air through the door when nec-
essary. 

§ 121.219 Ventilation. 

Each passenger or crew compartment 

must be suitably ventilated. Carbon 
monoxide concentration may not be 
more than one part in 20,000 parts of 
air, and fuel fumes may not be present. 
In any case where partitions between 
compartments have louvres or other 
means allowing air to flow between 
compartments, there must be a means 
convenient to the crew for closing the 
flow of air through the partitions, 
when necessary. 

§ 121.221 Fire precautions. 

(a) Each compartment must be de-

signed so that, when used for storing 
cargo or baggage, it meets the fol-
lowing requirements: 

(1) No compartment may include con-

trols, wiring, lines, equipment, or ac-
cessories that would upon damage or 
failure, affect the safe operation of the 
airplane unless the item is adequately 
shielded, isolated, or otherwise pro-
tected so that it cannot be damaged by 
movement of cargo in the compart-
ment and so that damage to or failure 
of the item would not create a fire haz-
ard in the compartment. 

(2) Cargo or baggage may not inter-

fere with the functioning of the fire- 
protective features of the compart-
ment. 

(3) Materials used in the construction 

of the compartments, including tie- 
down equipment, must be at least 
flame resistant. 

(4) Each compartment must include 

provisions for safeguarding against 
fires according to the classifications 
set forth in paragraphs (b) through (f) 
of this section. 

(b) 

Class A. 

Cargo and baggage com-

partments are classified in the ‘‘A’’ 
category if— 

(1) A fire therein would be readily 

discernible to a member of the crew 
while at his station; and 

(2) All parts of the compartment are 

easily accessible in flight. 

There must be a hand fire extinguisher 
available for each Class A compart-
ment. 

(c) 

Class B. 

Cargo and baggage com-

partments are classified in the ‘‘B’’ 
category if enough access is provided 
while in flight to enable a member of