609 

Federal Aviation Administration, DOT 

§ 29.771 

the tire and any part of the structure 
or systems. 

[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as 
amended by Amdt. 29–12, 41 FR 55471, Dec. 20, 
1976] 

§ 29.735

Brakes. 

For rotorcraft with wheel-type land-

ing gear, a braking device must be in-
stalled that is— 

(a) Controllable by the pilot; 
(b) Usable during power-off landings; 

and 

(c) Adequate to— 
(1) Counteract any normal unbal-

anced torque when starting or stopping 
the rotor; and 

(2) Hold the rotorcraft parked on a 

10-degree slope on a dry, smooth pave-
ment. 

[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as 
amended by Amdt. 29–24, 49 FR 44437, Nov. 6, 
1984] 

§ 29.737

Skis. 

(a) The maximum limit load rating of 

each ski must equal or exceed the max-
imum limit load determined under the 
applicable ground load requirements of 
this part. 

(b) There must be a stabilizing means 

to maintain the ski in an appropriate 
position during flight. This means 
must have enough strength to with-
stand the maximum aerodynamic and 
inertia loads on the ski. 

F

LOATS AND

H

ULLS

 

§ 29.751

Main float buoyancy. 

(a) For main floats, the buoyancy 

necessary to support the maximum 
weight of the rotorcraft in fresh water 
must be exceeded by— 

(1) 50 percent, for single floats; and 
(2) 60 percent, for multiple floats. 
(b) Each main float must have 

enough water-tight compartments so 
that, with any single main float com-
partment flooded, the mainfloats will 
provide a margin of positive stability 
great enough to minimize the prob-
ability of capsizing. 

[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as 
amended by Amdt. 29–3, 33 FR 967, Jan. 26, 
1968] 

§ 29.753

Main float design. 

(a) 

Bag floats. 

Each bag float must be 

designed to withstand— 

(1) The maximum pressure differen-

tial that might be developed at the 
maximum altitude for which certifi-
cation with that float is requested; and 

(2) The vertical loads prescribed in 

§ 29.521(a), distributed along the length 
of the bag over three-quarters of its 
projected area. 

(b) 

Rigid floats. 

Each rigid float must 

be able to withstand the vertical, hori-
zontal, and side loads prescribed in 
§ 29.521. An appropriate load distribu-
tion under critical conditions must be 
used. 

§ 29.755

Hull buoyancy. 

Water-based and amphibian rotorcraft. 

The hull and auxiliary floats, if used, 
must have enough watertight compart-
ments so that, with any single com-
partment of the hull or auxiliary floats 
flooded, the buoyancy of the hull and 
auxiliary floats, and wheel tires if 
used, provides a margin of positive 
water stability great enough to mini-
mize the probability of capsizing the 
rotorcraft for the worst combination of 
wave heights and surface winds for 
which approval is desired. 

[Amdt. 29–3, 33 FR 967, Jan. 26, 1968, as 
amended by Amdt. 27–26, 55 FR 8003, Mar. 6, 
1990] 

§ 29.757

Hull and auxiliary float 

strength. 

The hull, and auxiliary floats if used, 

must withstand the water loads pre-
scribed by § 29.519 with a rational and 
conservative distribution of local and 
distributed water pressures over the 
hull and float bottom. 

[Amdt. 29–3, 33 FR 967, Jan. 26, 1968] 

P

ERSONNEL AND

C

ARGO

 

A

CCOMMODATIONS

 

§ 29.771

Pilot compartment. 

For each pilot compartment— 
(a) The compartment and its equip-

ment must allow each pilot to perform 
his duties without unreasonable con-
centration or fatigue; 

(b) If there is provision for a second 

pilot, the rotorcraft must be control-
lable with equal safety from either 

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