Federal Aviation Administration, DOT

Section 135.91

(1) For cargo, it is properly secured
by a safety belt or other tie-down having enough strength to eliminate the
possibility of shifting under all normally anticipated flight and ground
conditions, or for carry-on baggage, it
is restrained so as to prevent its movement during air turbulence.
(2) It is packaged or covered to avoid
possible injury to occupants.
(3) It does not impose any load on
seats or on the floor structure that exceeds the load limitation for those
components.
(4) It is not located in a position that
obstructs the access to, or use of, any
required emergency or regular exit, or
the use of the aisle between the crew
and the passenger compartment, or located in a position that obscures any
passenger-s view of the  - seat belt - 
sign,  - no smoking -  sign, or any required exit sign, unless an auxiliary
sign or other approved means for proper notification of the passengers is provided.
(5) It is not carried directly above
seated occupants.
(6) It is stowed in compliance with
this section for takeoff and landing.
(7) For cargo only operations, paragraph (c)(4) of this section does not
apply if the cargo is loaded so that at
least one emergency or regular exit is
available to provide all occupants of
the aircraft a means of unobstructed
exit from the aircraft if an emergency
occurs.
(d) Each passenger seat under which
baggage is stowed shall be fitted with a
means to prevent articles of baggage
stowed under it from sliding under
crash impacts severe enough to induce
the ultimate inertia forces specified in
the emergency landing condition regulations under which the aircraft was
type certificated.
(e) When cargo is carried in cargo
compartments that are designed to require the physical entry of a crewmember to extinguish any fire that
may occur during flight, the cargo
must be loaded so as to allow a crewmember to effectively reach all parts
of the compartment with the contents
of a hand fire extinguisher.

Section 135.89 Pilot requirements: Use of oxygen.
(a) Unpressurized aircraft. Each pilot
of an unpressurized aircraft shall use
oxygen continuously when flying - 
(1) At altitudes above 10,000 feet
through 12,000 feet MSL for that part of
the flight at those altitudes that is of
more than 30 minutes duration; and
(2) Above 12,000 feet MSL.
(b) Pressurized aircraft. (1) Whenever a
pressurized aircraft is operated with
the cabin pressure altitude more than
10,000 feet MSL, each pilot shall comply with paragraph (a) of this section.
(2) Whenever a pressurized aircraft is
operated at altitudes above 25,000 feet
through 35,000 feet MSL, unless each
pilot has an approved quick-donning
type oxygen mask - 
(i) At least one pilot at the controls
shall wear, secured and sealed, an oxygen mask that either supplies oxygen
at all times or automatically supplies
oxygen whenever the cabin pressure altitude exceeds 12,000 feet MSL; and
(ii) During that flight, each other
pilot on flight deck duty shall have an
oxygen mask, connected to an oxygen
supply, located so as to allow immediate placing of the mask on the pilot-s
face sealed and secured for use.
(3) Whenever a pressurized aircraft is
operated at altitudes above 35,000 feet
MSL, at least one pilot at the controls
shall wear, secured and sealed, an oxygen mask required by paragraph
(b)(2)(i) of this section.
(4) If one pilot leaves a pilot duty station of an aircraft when operating at
altitudes above 25,000 feet MSL, the remaining pilot at the controls shall put
on and use an approved oxygen mask
until the other pilot returns to the
pilot duty station of the aircraft.
Section 135.91 Oxygen and portable oxygen
concentrators for medical use by
passengers.
(a) Except as provided in paragraphs
(d) and (e) of this section, no certificate holder may allow the carriage or
operation of equipment for the storage,
generation or dispensing of medical oxygen unless the conditions in paragraphs (a) through (c) of this section
are satisfied. Beginning August 22, 2016,
a certificate holder may allow a passenger to carry and operate a portable

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