442 

14 CFR Ch. I (1–1–19 Edition) 

§ 135.157 

any parameter listed in paragraph (c) 
of this section that does not meet the 
requirements of Appendix D or F of 
this part, unless the certificate holder 
possesses test and analysis procedures 
and the test results that have been ap-
proved by the FAA. All records of 
tests, analysis and procedures used to 
comply with this section must be 
maintained as part of the correlation 
documentation required by § 135.152 
(f)(1)(iii) or (f)(2)(iii) of this part as ap-
plicable. 

[Doc. No. FAA–2006–26135, 75 FR 7357, Feb. 19, 
2010] 

§ 135.157

Oxygen equipment require-

ments. 

(a) 

Unpressurized aircraft. 

No person 

may operate an unpressurized aircraft 
at altitudes prescribed in this section 
unless it is equipped with enough oxy-
gen dispensers and oxygen to supply 
the pilots under § 135.89(a) and to sup-
ply, when flying— 

(1) At altitudes above 10,000 feet 

through 15,000 feet MSL, oxygen to at 
least 10 percent of the occupants of the 
aircraft, other than the pilots, for that 
part of the flight at those altitudes 
that is of more than 30 minutes dura-
tion; and 

(2) Above 15,000 feet MSL, oxygen to 

each occupant of the aircraft other 
than the pilots. 

(b) 

Pressurized aircraft. 

No person may 

operate a pressurized aircraft— 

(1) At altitudes above 25,000 feet 

MSL, unless at least a 10-minute sup-
ply of supplemental oxygen is available 
for each occupant of the aircraft, other 
than the pilots, for use when a descent 
is necessary due to loss of cabin pres-
surization; and 

(2) Unless it is equipped with enough 

oxygen dispensers and oxygen to com-
ply with paragraph (a) of this section 
whenever the cabin pressure altitude 
exceeds 10,000 feet MSL and, if the 
cabin pressurization fails, to comply 
with § 135.89 (a) or to provide a 2-hour 
supply for each pilot, whichever is 
greater, and to supply when flying— 

(i) At altitudes above 10,000 feet 

through 15,000 feet MSL, oxygen to at 
least 10 percent of the occupants of the 
aircraft, other than the pilots, for that 
part of the flight at those altitudes 

that is of more than 30 minutes dura-
tion; and 

(ii) Above 15,000 feet MSL, oxygen to 

each occupant of the aircraft, other 
than the pilots, for one hour unless, at 
all times during flight above that alti-
tude, the aircraft can safely descend to 
15,000 feet MSL within four minutes, in 
which case only a 30-minute supply is 
required. 

(c) The equipment required by this 

section must have a means— 

(1) To enable the pilots to readily de-

termine, in flight, the amount of oxy-
gen available in each source of supply 
and whether the oxygen is being deliv-
ered to the dispensing units; or 

(2) In the case of individual dis-

pensing units, to enable each user to 
make those determinations with re-
spect to that person’s oxygen supply 
and delivery; and 

(3) To allow the pilots to use undi-

luted oxygen at their discretion at alti-
tudes above 25,000 feet MSL. 

§ 135.158

Pitot heat indication systems. 

(a) Except as provided in paragraph 

(b) of this section, after April 12, 1981, 
no person may operate a transport cat-
egory airplane equipped with a flight 
instrument pitot heating system unless 
the airplane is also equipped with an 
operable pitot heat indication system 
that complies with § 25.1326 of this 
chapter in effect on April 12, 1978. 

(b) A certificate holder may obtain 

an extension of the April 12, 1981, com-
pliance date specified in paragraph (a) 
of this section, but not beyond April 12, 
1983, from the Executive Director, 
Flight Standards Service if the certifi-
cate holder— 

(1) Shows that due to circumstances 

beyond its control it cannot comply by 
the specified compliance date; and 

(2) Submits by the specified compli-

ance date a schedule for compliance, 
acceptable to the Executive Director, 
indicating that compliance will be 
achieved at the earliest practicable 
date. 

[Doc. No. 18094, Amdt. 135–17, 46 FR 48306, 
Aug. 31, 1981, as amended by Amdt. 135–33, 54 
FR 39294, Sept. 25, 1989; Docket FAA–2018– 
0119, Amdt. 135–139, 83 FR 9175, Mar. 5, 2018] 

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