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14 CFR Ch. I (1–1–24 Edition)
§ 135.171
(b)(1)(vi) of this section for specific
components of the cabin interior that
do not meet applicable flammability
and smoke emission requirements, if
the determination is made that special
circumstances exist that make compli-
ance impractical. Such grants of devi-
ation will be limited to those airplanes
manufactured within 1 year after the
applicable date specified in this section
and those airplanes in which the inte-
rior is replaced within 1 year of that
date. A request for such grant of devi-
ation must include a thorough and ac-
curate analysis of each component sub-
ject to § 25.853(d) in effect March 6, 1995
(formerly § 25.853(a–1) in effect on Au-
gust 20, 1986), the steps being taken to
achieve compliance, and, for the few
components for which timely compli-
ance will not be achieved, credible rea-
sons for such noncompliance.
(viii) Contrary provisions of this sec-
tion notwithstanding, galley carts and
standard galley containers that do not
meet the flammability and smoke
emission requirements of § 25.853(d) in
effect March 6, 1995 (formerly § 25.853(a–
1) in effect on August 20, 1986), may be
used in airplanes that must meet the
requirements of paragraph (b)(1)(i),
(b)(1)(ii), (b)(1)(iv) or (b)(1)(vi) of this
section provided the galley carts or
standard containers were manufac-
tured prior to March 6, 1995.
(2) For airplanes type certificated
after January 1, 1958, seat cushions, ex-
cept those on flight crewmember seats,
in any compartment occupied by crew
or passengers must comply with the re-
quirements pertaining to fire protec-
tion of seat cushions in § 25.853(c) effec-
tive November 26, 1984.
(c) Thermal/acoustic insulation ma-
terials. For transport category air-
planes type certificated after January
1, 1958:
(1) For airplanes manufactured before
September 2, 2005, when thermal/acous-
tic insulation is installed in the fuse-
lage as replacements after September
2, 2005, the insulation must meet the
flame propagation requirements of
§ 25.856 of this chapter, effective Sep-
tember 2, 2003, if it is:
(i) Of a blanket construction, or
(ii) Installed around air ducting.
(2) For airplanes manufactured after
September 2, 2005, thermal/acoustic in-
sulation materials installed in the fu-
selage must meet the flame propaga-
tion requirements of § 25.856 of this
chapter, effective September 2, 2003.
[Doc. No. 26192, 60 FR 6628, Feb. 2, 1995; Amdt.
135–55, 60 FR 11194, Mar. 1, 1995; Amdt. 135–56,
60 FR 13011, Mar. 9, 1995; Amdt. 135–90, 68 FR
45084, July 31, 2003; Amdt. 135–103, 70 FR
77752, Dec. 30, 2005; Docket FAA–2018–0119,
Amdt. 135–139, 83 FR 9175, Mar. 5, 2018]
§ 135.171 Shoulder harness installation
at flight crewmember stations.
(a) No person may operate a turbojet
aircraft or an aircraft having a pas-
senger seating configuration, excluding
any pilot seat, of 10 seats or more un-
less it is equipped with an approved
shoulder harness installed for each
flight crewmember station.
(b) Each flight crewmember occu-
pying a station equipped with a shoul-
der harness must fasten the shoulder
harness during takeoff and landing, ex-
cept that the shoulder harness may be
unfastened if the crewmember cannot
perform the required duties with the
shoulder harness fastened.
§ 135.173 Airborne thunderstorm de-
tection equipment requirements.
(a) No person may operate an aircraft
that has a passenger seating configura-
tion, excluding any pilot seat, of 10
seats or more in passenger-carrying op-
erations, except a helicopter operating
under day VFR conditions, unless the
aircraft is equipped with either ap-
proved thunderstorm detection equip-
ment or approved airborne weather
radar equipment.
(b) No person may operate a heli-
copter that has a passenger seating
configuration, excluding any pilot seat,
of 10 seats or more in passenger-car-
rying operations, under night VFR
when current weather reports indicate
that thunderstorms or other poten-
tially hazardous weather conditions
that can be detected with airborne
thunderstorm detection equipment
may reasonably be expected along the
route to be flown, unless the helicopter
is equipped with either approved thun-
derstorm detection equipment or ap-
proved airborne weather radar equip-
ment.
(c) No person may begin a flight
under IFR or night VFR conditions