background image

276 

14 CFR Ch. I (1–1–24 Edition) 

§ 25.737 

(3) 

Most severe landing stop. The most 

severe landing stop is a stop at the 
most critical combination of airplane 
landing weight and speed. The most se-
vere landing stop brake kinetic energy 
absorption requirement of each wheel, 
brake, and tire assembly must be de-
termined. It must be substantiated by 
dynamometer testing that, at the de-
clared fully worn limit(s) of the brake 
heat sink, the wheel, brake and tire as-
sembly is capable of absorbing not less 
than this level of kinetic energy. The 
most severe landing stop need not be 
considered for extremely improbable 
failure conditions or if the maximum 
kinetic energy accelerate-stop energy 
is more severe. 

(g) 

Brake condition after high kinetic 

energy dynamometer stop(s). Following 
the high kinetic energy stop dem-
onstration(s) required by paragraph (f) 
of this section, with the parking brake 
promptly and fully applied for at least 
3 minutes, it must be demonstrated 
that for at least 5 minutes from appli-
cation of the parking brake, no condi-
tion occurs (or has occurred during the 
stop), including fire associated with 
the tire or wheel and brake assembly, 
that could prejudice the safe and com-
plete evacuation of the airplane. 

(h) 

Stored energy systems. An indica-

tion to the flightcrew of the usable 
stored energy must be provided if a 
stored energy system is used to show 
compliance with paragraph (b)(1) of 
this section. The available stored en-
ergy must be sufficient for: 

(1) At least 6 full applications of the 

brakes when an antiskid system is not 
operating; and 

(2) Bringing the airplane to a com-

plete stop when an antiskid system is 
operating, under all runway surface 
conditions for which the airplane is 
certificated. 

(i) 

Brake wear indicators. Means must 

be provided for each brake assembly to 
indicate when the heat sink is worn to 
the permissible limit. The means must 
be reliable and readily visible. 

(j) 

Overtemperature burst prevention. 

Means must be provided in each braked 
wheel to prevent a wheel failure, a tire 
burst, or both, that may result from 
elevated brake temperatures. Addition-
ally, all wheels must meet the require-
ments of § 25.731(d). 

(k) 

Compatibility.  Compatibility of 

the wheel and brake assemblies with 
the airplane and its systems must be 
substantiated. 

[Doc. No. FAA–1999–6063, 67 FR 20420, Apr. 24, 
2002, as amended by Amdt. 25–108, 67 FR 
70827, Nov. 26, 2002; 68 FR 1955, Jan. 15, 2003] 

§ 25.737

Skis. 

Each ski must be approved. The max-

imum limit load rating of each ski 
must equal or exceed the maximum 
limit load determined under the appli-
cable ground load requirements of this 
part. 

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 

VerDate Sep<11>2014 

09:06 Jun 28, 2024

Jkt 262046

PO 00000

Frm 00286

Fmt 8010

Sfmt 8010

Y:\SGML\262046.XXX

262046

jspears on DSK121TN23PROD with CFR