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454 

14 CFR Ch. I (1–1–24 Edition) 

§ 135.157 

also subject to the requirements of 
§ 135.152(e). 

(d) 

Compliance. 

Compliance is re-

quired as follows: 

(1) No later than October 20, 2011, 

each operator must determine, for each 
aircraft on its operations specifica-
tions, whether the aircraft’s DFDR sys-
tem is filtering any of the parameters 
listed in paragraph (c) of this section. 
The operator must create a record of 
this determination for each aircraft it 
operates, and maintain it as part of the 
correlation documentation required by 
§ 135.152 (f)(1)(iii) or (f)(2)(iii) of this 
part as applicable. 

(2) For aircraft that are not filtering 

any listed parameter, no further action 
is required unless the aircraft’s DFDR 
system is modified in a manner that 
would cause it to meet the definition of 
filtering on any listed parameter. 

(3) For aircraft found to be filtering a 

parameter listed in paragraph (c) of 
this section the operator must either: 

(i) No later than April 21, 2014, re-

move the filtering; or 

(ii) No later than April 22, 2013, sub-

mit the necessary procedure and test 
results required by paragraph (c)(2) of 
this section. 

(4) After April 21, 2014, no aircraft 

flight data recording system may filter 
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.