Section 135.157

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

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 approved 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 Section 135.152
(f)(1)(iii) or (f)(2)(iii) of this part as applicable.
[Doc. No. FAA-2006-26135, 75 FR 7357, Feb. 19,
2010]

Section 135.157 Oxygen equipment requirements.
(a) Unpressurized aircraft. No person
may operate an unpressurized aircraft
at altitudes prescribed in this section
unless it is equipped with enough oxygen dispensers and oxygen to supply
the pilots under Section 135.89(a) and to supply, 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 duration; 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 supply 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 pressurization; and
(2) Unless it is equipped with enough
oxygen dispensers and oxygen to comply 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 Section 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 duration; 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 altitude, 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 determine, in flight, the amount of oxygen available in each source of supply
and whether the oxygen is being delivered to the dispensing units; or
(2) In the case of individual dispensing units, to enable each user to
make those determinations with respect to that person-s oxygen supply
and delivery; and
(3) To allow the pilots to use undiluted oxygen at their discretion at altitudes above 25,000 feet MSL.
Section 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 category 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 Section 25.1326 of this
chapter in effect on April 12, 1978.
(b) A certificate holder may obtain
an extension of the April 12, 1981, compliance date specified in paragraph (a)
of this section, but not beyond April 12,
1983, from the Executive Director,
Flight Standards Service if the certificate holder - 
(1) Shows that due to circumstances
beyond its control it cannot comply by
the specified compliance date; and
(2) Submits by the specified compliance 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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