Federal Aviation Administration, DOT

Section 121.317

joint or fastener, which would affect
the capability of the liner to safely
contain a fire.
(c) After March 19, 2001, each Class D
compartment, regardless of volume,
must meet the standards of SectionSection 25.857(c)
and 25.858 of this Chapter for a Class C
compartment unless the operation is
an all-cargo operation in which case
each Class D compartment may meet
the standards in Section 25.857(e) for a Class E
compartment.
(d) Reports of conversions and retrofits.
(1) Until such time as all Class D compartments in aircraft operated under
this part by the certificate have been
converted or retrofitted with appropriate detection and suppression systems, each certificate holder must submit written progress reports to the
FAA that contain the information
specified below.
(i) The serial number of each airplane
listed in the operations specifications
issued to the certificate holder for operation under this part in which all
Class D compartments have been converted to Class C or Class E compartments;
(ii) The serial number of each airplane listed in the operations specification issued to the certificate holder for
operation under this part, in which all
Class D compartments have been retrofitted to meet the fire detection and
suppression requirements for Class C or
the fire detection requirements for
Class E; and
(iii) The serial number of each airplane listed in the operations specifications issued to the certificate holder
for operation under this part that has
at least one Class D compartment that
has not been converted or retrofitted.
(2) The written report must be submitted to the responsible Flight Standards office by July 1, 1998, and at each
three-month interval thereafter.
[Doc. No. 28937, 63 FR 8049, Feb. 17, 1998, as
amended by Docket FAA-2018-0119, Amdt.
121-380, 83 FR 9173, Mar. 5, 2018]

Section 121.315 Cockpit check procedure.
(a) Each certificate holder shall provide an approved cockpit check procedure for each type of aircraft.
(b) The approved procedures must include each item necessary for flight
crewmembers to check for safety be-

fore starting engines, taking off, or
landing, and in engine and systems
emergencies. The procedures must be
designed so that a flight crewmember
will not need to rely upon his memory
for items to be checked.
(c) The approved procedures must be
readily usable in the cockpit of each
aircraft and the flight crew shall follow
them when operating the aircraft.
Section 121.316

Fuel tanks.

Each turbine powered transport category airplane operated after October
30, 1991, must meet the requirements of
Section 25.963(e) of this chapter in effect on
October 30, 1989.
[Doc. No. 25614, 54 FR 40354, Sept. 29, 1989]

Section 121.317 Passenger information requirements, smoking prohibitions,
and additional seat belt requirements.
(a) Except as provided in paragraph
(l) of this section, no person may operate an airplane unless it is equipped
with passenger information signs that
meet the requirements of Section 25.791 of this
chapter. Except as provided in paragraph (l) of this section, the signs must
be constructed so that the crewmembers can turn them on and off.
(b) Except as provided in paragraph
(l) of this section, the  - Fasten Seat
Belt -  sign shall be turned on during
any movement on the surface, for each
takeoff, for each landing, and at any
other time considered necessary by the
pilot in command.
(c) No person may operate an airplane on a flight on which smoking is
prohibited by part 252 of this title unless either the  - No Smoking -  passenger information signs are lighted
during the entire flight, or one or more
 - No Smoking -  placards meeting the
requirements of Section 25.1541 of this chapter
are posted during the entire flight segment. If both the lighted signs and the
placards are used, the signs must remain lighted during the entire flight
segment.
(d) No person may operate a passenger-carrying airplane under this
part unless at least one legible sign or
placard that reads  - Fasten Seat Belt
While Seated -  is visible from each passenger seat. These signs or placards

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