450 

14 CFR Ch. I (1–1–19 Edition) 

§ 135.171 

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 
when current weather reports indicate 
that thunderstorms or other poten-
tially hazardous weather conditions 
that can be detected with airborne 
thunderstorm detection equipment, re-
quired by paragraph (a) or (b) of this 
section, may reasonably be expected 
along the route to be flown, unless the 
airborne thunderstorm detection equip-
ment is in satisfactory operating con-
dition. 

(d) If the airborne thunderstorm de-

tection equipment becomes inoperative 
en route, the aircraft must be operated 
under the instructions and procedures 
specified for that event in the manual 
required by § 135.21. 

(e) This section does not apply to air-

craft used solely within the State of 
Hawaii, within the State of Alaska, 
within that part of Canada west of lon-
gitude 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 provi-

sion of this part, an alternate elec-
trical power supply is not required for 

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