Section 135.171

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

section provided the galley carts or
standard containers were manufactured prior to March 6, 1995.
(2) For airplanes type certificated
after January 1, 1958, seat cushions, except those on flight crewmember seats,
in any compartment occupied by crew
or passengers must comply with the requirements pertaining to fire protection of seat cushions in Section 25.853(c) effective November 26, 1984.
(c) Thermal/acoustic insulation materials. For transport category airplanes type certificated after January
1, 1958:
(1) For airplanes manufactured before
September 2, 2005, when thermal/acoustic insulation is installed in the fuselage as replacements after September
2, 2005, the insulation must meet the
flame propagation requirements of
Section 25.856 of this chapter, effective September 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 insulation materials installed in the fuselage must meet the flame propagation requirements of Section 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]

Section 135.171 Shoulder harness installation
at flight crewmember stations.
(a) No person may operate a turbojet
aircraft or an aircraft having a passenger seating configuration, excluding
any pilot seat, of 10 seats or more unless it is equipped with an approved
shoulder harness installed for each
flight crewmember station.
(b) Each flight crewmember occupying a station equipped with a shoulder harness must fasten the shoulder
harness during takeoff and landing, except that the shoulder harness may be
unfastened if the crewmember cannot
perform the required duties with the
shoulder harness fastened.

Section 135.173 Airborne thunderstorm detection equipment requirements.
(a) No person may operate an aircraft
that has a passenger seating configuration, excluding any pilot seat, of 10
seats or more in passenger-carrying operations, except a helicopter operating
under day VFR conditions, unless the
aircraft is equipped with either approved thunderstorm detection equipment or approved airborne weather
radar equipment.
(b) No person may operate a helicopter that has a passenger seating
configuration, excluding any pilot seat,
of 10 seats or more in passenger-carrying operations, under night VFR
when current weather reports indicate
that thunderstorms or other potentially 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 thunderstorm detection equipment or approved airborne weather radar equipment.
(c) No person may begin a flight
under IFR or night VFR conditions
when current weather reports indicate
that thunderstorms or other potentially hazardous weather conditions
that can be detected with airborne
thunderstorm detection equipment, required by paragraph (a) or (b) of this
section, may reasonably be expected
along the route to be flown, unless the
airborne thunderstorm detection equipment is in satisfactory operating condition.
(d) If the airborne thunderstorm detection equipment becomes inoperative
en route, the aircraft must be operated
under the instructions and procedures
specified for that event in the manual
required by Section 135.21.
(e) This section does not apply to aircraft used solely within the State of
Hawaii, within the State of Alaska,
within that part of Canada west of longitude 130 degrees W, between latitude
70 degrees N, and latitude 53 degrees N,
or during any training, test, or ferry
flight.
(f) Without regard to any other provision of this part, an alternate electrical power supply is not required for

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