277 

Federal Aviation Administration, DOT 

§ 25.773 

F

LOATS AND

H

ULLS

 

§ 25.751

Main float buoyancy. 

Each main float must have— 
(a) A buoyancy of 80 percent in excess 

of that required to support the max-
imum weight of the seaplane or am-
phibian in fresh water; and 

(b) Not less than five watertight com-

partments approximately equal in vol-
ume. 

§ 25.753

Main float design. 

Each main float must be approved 

and must meet the requirements of 
§ 25.521. 

§ 25.755

Hulls. 

(a) Each hull must have enough wa-

tertight compartments so that, with 
any two adjacent compartments flood-
ed, the buoyancy of the hull and auxil-
iary floats (and wheel tires, if used) 
provides a margin of positive stability 
great enough to minimize the prob-
ability of capsizing in rough, fresh 
water. 

(b) Bulkheads with watertight doors 

may be used for communication be-
tween compartments. 

P

ERSONNEL AND

C

ARGO

 

A

CCOMMODATIONS

 

§ 25.771

Pilot compartment. 

(a) Each pilot compartment and its 

equipment must allow the minimum 
flight crew (established under § 25.1523) 
to perform their duties without unrea-
sonable concentration or fatigue. 

(b) The primary controls listed in 

§ 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 § 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 for-
ward 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 man-
ner that will distract the crew or harm 
the structure. 

(e) Vibration and noise characteris-

tics of cockpit equipment may not 
interfere with safe operation of the air-
plane. 

[Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as 
amended by Amdt. 25–4, 30 FR 6113, Apr. 30, 
1965] 

§ 25.772

Pilot compartment doors. 

For an airplane that has a lockable 

door installed between the pilot com-
partment and the passenger compart-
ment: 

(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 pro-
vided 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 in-
capacitated. 

[Doc. No. 24344, 55 FR 29777, July 20, 1990, as 
amended by Amdt. 25–106, 67 FR 2127, Jan. 15, 
2002] 

§ 25.773

Pilot compartment view. 

(a) 

Nonprecipitation conditions. 

For 

nonprecipitation conditions, the fol-
lowing apply: 

(1) Each pilot compartment must be 

arranged to give the pilots a suffi-
ciently extensive, clear, and undis-
torted view, to enable them to safely 
perform any maneuvers within the op-
erating limitations of the airplane, in-
cluding 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 § 25.1523). This must be shown in 
day and night flight tests under non-
precipitation conditions. 

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