748 

14 CFR Ch. I (1–1–19 Edition) 

§ 91.209 

(2) Aircraft while engaged in sched-

uled flights by scheduled air carriers; 

(3) Aircraft while engaged in training 

operations conducted entirely within a 
50-nautical mile radius of the airport 
from which such local flight operations 
began; 

(4) Aircraft while engaged in flight 

operations incident to design and test-
ing; 

(5) New aircraft while engaged in 

flight operations incident to their man-
ufacture, preparation, and delivery; 

(6) Aircraft while engaged in flight 

operations incident to the aerial appli-
cation of chemicals and other sub-
stances for agricultural purposes; 

(7) Aircraft certificated by the Ad-

ministrator for research and develop-
ment purposes; 

(8) Aircraft while used for showing 

compliance with regulations, crew 
training, exhibition, air racing, or mar-
ket surveys; 

(9) Aircraft equipped to carry not 

more than one person. 

(10) An aircraft during any period for 

which the transmitter has been tempo-
rarily removed for inspection, repair, 
modification, or replacement, subject 
to the following: 

(i) No person may operate the air-

craft unless the aircraft records con-
tain an entry which includes the date 
of initial removal, the make, model, se-
rial number, and reason for removing 
the transmitter, and a placard located 
in view of the pilot to show ‘‘ELT not 
installed.’’ 

(ii) No person may operate the air-

craft more than 90 days after the ELT 
is initially removed from the aircraft; 
and 

(11) On and after January 1, 2004, air-

craft with a maximum payload capac-
ity of more than 18,000 pounds when 
used in air transportation. 

[Doc. No. 18334, 54 FR 34304, Aug. 18, 1989, as 
amended by Amdt. 91–242, 59 FR 32057, June 
21, 1994; 59 FR 34578, July 6, 1994; Amdt. 91– 
265, 65 FR 81319, Dec. 22, 2000; 66 FR 16316, 
Mar. 23, 2001] 

§ 91.209

Aircraft lights. 

No person may: 
(a) During the period from sunset to 

sunrise (or, in Alaska, during the pe-
riod a prominent unlighted object can-
not be seen from a distance of 3 statute 

miles or the sun is more than 6 degrees 
below the horizon)— 

(1) Operate an aircraft unless it has 

lighted position lights; 

(2) Park or move an aircraft in, or in 

dangerous proximity to, a night flight 
operations area of an airport unless the 
aircraft— 

(i) Is clearly illuminated; 
(ii) Has lighted position lights; or 
(iii) is in an area that is marked by 

obstruction lights; 

(3) Anchor an aircraft unless the air-

craft— 

(i) Has lighted anchor lights; or 
(ii) Is in an area where anchor lights 

are not required on vessels; or 

(b) Operate an aircraft that is 

equipped with an anticollision light 
system, unless it has lighted anti-
collision lights. However, the anti-
collision lights need not be lighted 
when the pilot-in-command determines 
that, because of operating conditions, 
it would be in the interest of safety to 
turn the lights off. 

[Doc. No. 27806, 61 FR 5171, Feb. 9, 1996] 

§ 91.211

Supplemental oxygen. 

(a) 

General. 

No person may operate a 

civil aircraft of U.S. registry— 

(1) At cabin pressure altitudes above 

12,500 feet (MSL) up to and including 
14,000 feet (MSL) unless the required 
minimum flight crew is provided with 
and uses supplemental oxygen for that 
part of the flight at those altitudes 
that is of more than 30 minutes dura-
tion; 

(2) At cabin pressure altitudes above 

14,000 feet (MSL) unless the required 
minimum flight crew is provided with 
and uses supplemental oxygen during 
the entire flight time at those alti-
tudes; and 

(3) At cabin pressure altitudes above 

15,000 feet (MSL) unless each occupant 
of the aircraft is provided with supple-
mental oxygen. 

(b) 

Pressurized cabin aircraft. 

(1) No 

person may operate a civil aircraft of 
U.S. registry with a pressurized cabin— 

(i) At flight altitudes above flight 

level 250 unless at least a 10-minute 
supply of supplemental oxygen, in addi-
tion to any oxygen required to satisfy 
paragraph (a) of this section, is avail-
able for each occupant of the aircraft 
for use in the event that a descent is 

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