Federal Aviation Administration, DOT

Section 91.213

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necessitated by loss of cabin pressurization; and
(ii) At flight altitudes above flight
level 350 unless one pilot at the controls of the airplane is wearing and
using an oxygen mask that is secured
and sealed and that either supplies oxygen at all times or automatically supplies oxygen whenever the cabin pressure altitude of the airplane exceeds
14,000 feet (MSL), except that the one
pilot need not wear and use an oxygen
mask while at or below flight level 410
if there are two pilots at the controls
and each pilot has a quick-donning
type of oxygen mask that can be placed
on the face with one hand from the
ready position within 5 seconds, supplying oxygen and properly secured and
sealed.
(2)
Notwithstanding
paragraph
(b)(1)(ii) of this section, if for any reason at any time it is necessary for one
pilot to leave the controls of the aircraft when operating at flight altitudes
above flight level 350, the remaining
pilot at the controls shall put on and
use an oxygen mask until the other
pilot has returned to that crewmember-s station.
Section 91.213 Inoperative instruments and
equipment.
(a) Except as provided in paragraph
(d) of this section, no person may take
off an aircraft with inoperative instruments or equipment installed unless
the following conditions are met:
(1) An approved Minimum Equipment
List exists for that aircraft.
(2) The aircraft has within it a letter
of authorization, issued by the responsible Flight Standards office, authorizing operation of the aircraft under
the Minimum Equipment List. The letter of authorization may be obtained
by written request of the airworthiness
certificate
holder.
The
Minimum
Equipment List and the letter of authorization constitute a supplemental
type certificate for the aircraft.
(3) The approved Minimum Equipment List must - 
(i) Be prepared in accordance with
the limitations specified in paragraph
(b) of this section; and
(ii) Provide for the operation of the
aircraft with the instruments and
equipment in an inoperable condition.

(4) The aircraft records available to
the pilot must include an entry describing the inoperable instruments
and equipment.
(5) The aircraft is operated under all
applicable conditions and limitations
contained in the Minimum Equipment
List and the letter authorizing the use
of the list.
(b) The following instruments and
equipment may not be included in a
Minimum Equipment List:
(1) Instruments and equipment that
are either specifically or otherwise required by the airworthiness requirements under which the aircraft is type
certificated and which are essential for
safe operations under all operating
conditions.
(2) Instruments and equipment required by an airworthiness directive to
be in operable condition unless the airworthiness directive provides otherwise.
(3) Instruments and equipment required for specific operations by this
part.
(c) A person authorized to use an approved Minimum Equipment List
issued for a specific aircraft under subpart K of this part, part 121, 125, or 135
of this chapter must use that Minimum
Equipment List to comply with the requirements in this section.
(d) Except for operations conducted
in accordance with paragraph (a) or (c)
of this section, a person may takeoff an
aircraft in operations conducted under
this part with inoperative instruments
and equipment without an approved
Minimum Equipment List provided - 
(1) The flight operation is conducted
in a - 
(i) Rotorcraft, non-turbine-powered
airplane, glider, lighter-than-air aircraft, powered parachute, or weightshift-control aircraft, for which a master minimum equipment list has not
been developed; or
(ii) Small rotorcraft, nonturbinepowered small airplane, glider, or
lighter-than-air aircraft for which a
Master Minimum Equipment List has
been developed; and
(2) The inoperative instruments and
equipment are not - 
(i) Part of the VFR-day type certification instruments and equipment prescribed in the applicable airworthiness

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