Federal Aviation Administration, DOT

Section 25.773

FLOATS AND HULLS
Section 25.751 Main float buoyancy.
Each main float must have - 
(a) A buoyancy of 80 percent in excess
of that required to support the maximum weight of the seaplane or amphibian in fresh water; and
(b) Not less than five watertight compartments approximately equal in volume.
Section 25.753 Main float design.
Each main float must be approved
and must meet the requirements of
Section 25.521.
Section 25.755 Hulls.
(a) Each hull must have enough watertight compartments so that, with
any two adjacent compartments flooded, the buoyancy of the hull and auxiliary floats (and wheel tires, if used)
provides a margin of positive stability
great enough to minimize the probability of capsizing in rough, fresh
water.
(b) Bulkheads with watertight doors
may be used for communication between compartments.

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PERSONNEL AND CARGO
ACCOMMODATIONS
Section 25.771 Pilot compartment.
(a) Each pilot compartment and its
equipment must allow the minimum
flight crew (established under Section 25.1523)
to perform their duties without unreasonable concentration or fatigue.
(b) The primary controls listed in
Section 25.779(a), excluding cables and control
rods, must be located with respect to
the propellers so that no member of the
minimum flight crew (established
under Section 25.1523), or part of the controls,
lies in the region between the plane of
rotation of any inboard propeller and
the surface generated by a line passing
through the center of the propeller hub
making an angle of five degrees forward or aft of the plane of rotation of
the propeller.
(c) If provision is made for a second
pilot, the airplane must be controllable
with equal safety from either pilot
seat.
(d) The pilot compartment must be
constructed so that, when flying in

rain or snow, it will not leak in a manner that will distract the crew or harm
the structure.
(e) Vibration and noise characteristics of cockpit equipment may not
interfere with safe operation of the airplane.
[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as
amended by Amdt. 25-4, 30 FR 6113, Apr. 30,
1965]

Section 25.772

Pilot compartment doors.

For an airplane that has a lockable
door installed between the pilot compartment and the passenger compartment:
(a) For airplanes with a maximum
passenger seating configuration of
more than 20 seats, the emergency exit
configuration must be designed so that
neither crewmembers nor passengers
require use of the flightdeck door in
order to reach the emergency exits provided for them; and
(b) Means must be provided to enable
flight crewmembers to directly enter
the passenger compartment from the
pilot compartment if the cockpit door
becomes jammed.
(c) There must be an emergency
means to enable a flight attendant to
enter the pilot compartment in the
event that the flightcrew becomes incapacitated.
[Doc. No. 24344, 55 FR 29777, July 20, 1990, as
amended by Amdt. 25-106, 67 FR 2127, Jan. 15,
2002]

Section 25.773

Pilot compartment view.

(a) Nonprecipitation conditions. For
nonprecipitation conditions, the following apply:
(1) Each pilot compartment must be
arranged to give the pilots a sufficiently extensive, clear, and undistorted view, to enable them to safely
perform any maneuvers within the operating limitations of the airplane, including taxiing takeoff, approach, and
landing.
(2) Each pilot compartment must be
free of glare and reflection that could
interfere with the normal duties of the
minimum flight crew (established
under Section 25.1523). This must be shown in
day and night flight tests under nonprecipitation conditions.

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