468 

14 CFR Ch. I (1–1–14 Edition) 

§ 25.867 

§ 25.867

Fire protection: other compo-

nents. 

(a) Surfaces to the rear of the na-

celles, within one nacelle diameter of 
the nacelle centerline, must be at least 
fire-resistant. 

(b) Paragraph (a) of this section does 

not apply to tail surfaces to the rear of 
the nacelles that could not be readily 
affected by heat, flames, or sparks 
coming from a designated fire zone or 
engine compartment of any nacelle. 

[Amdt. 25–23, 35 FR 5676, Apr. 8, 1970] 

§ 25.869

Fire protection: systems. 

(a) Electrical system components: 
(1) Components of the electrical sys-

tem must meet the applicable fire and 
smoke protection requirements of 
§§ 25.831(c) and 25.863. 

(2) Equipment that is located in des-

ignated fire zones and is used during 
emergency procedures must be at least 
fire resistant. 

(3) EWIS components must meet the 

requirements of § 25.1713. 

(b) Each vacuum air system line and 

fitting on the discharge side of the 
pump that might contain flammable 
vapors or fluids must meet the require-
ments of § 25.1183 if the line or fitting is 
in a designated fire zone. Other vacuum 
air systems components in designated 
fire zones must be at least fire resist-
ant. 

(c) Oxygen equipment and lines 

must— 

(1) Not be located in any designated 

fire zone, 

(2) Be protected from heat that may 

be generated in, or escape from, any 
designated fire zone, and 

(3) Be installed so that escaping oxy-

gen cannot cause ignition of grease, 
fluid, or vapor accumulations that are 
present in normal operation or as a re-
sult of failure or malfunction of any 
system. 

[Amdt. 25–72, 55 FR 29784, July 20, 1990, as 
amended by Amdt. 25–113, 69 FR 12530, Mar. 
16, 2004; Amdt. 25–123, 72 FR 63405, Nov. 8, 
2007] 

M

ISCELLANEOUS

 

§ 25.871

Leveling means. 

There must be means for determining 

when the airplane is in a level position 
on the ground. 

[Amdt. 25–23, 35 FR 5676, Apr. 8, 1970] 

§ 25.875

Reinforcement near propel-

lers. 

(a) Each part of the airplane near the 

propeller tips must be strong and stiff 
enough to withstand the effects of the 
induced vibration and of ice thrown 
from the propeller. 

(b) No window may be near the pro-

peller tips unless it can withstand the 
most severe ice impact likely to occur. 

§ 25.899

Electrical bonding and protec-

tion against static electricity. 

(a) Electrical bonding and protection 

against static electricity must be de-
signed to minimize accumulation of 
electrostatic charge that would cause— 

(1) Human injury from electrical 

shock, 

(2) Ignition of flammable vapors, or 
(3) Interference with installed elec-

trical/electronic equipment. 

(b) Compliance with paragraph (a) of 

this section may be shown by— 

(1) Bonding the components properly 

to the airframe; or 

(2) Incorporating other acceptable 

means to dissipate the static charge so 
as not to endanger the airplane, per-
sonnel, or operation of the installed 
electrical/electronic systems. 

[Amdt. 25–123, 72 FR 63405, Nov. 8, 2007] 

Subpart E—Powerplant 

G

ENERAL

 

§ 25.901

Installation. 

(a) For the purpose of this part, the 

airplane powerplant installation in-
cludes each component that— 

(1) Is necessary for propulsion; 
(2) Affects the control of the major 

propulsive units; or 

(3) Affects the safety of the major 

propulsive units between normal in-
spections or overhauls. 

(b) For each powerplant— 
(1) The installation must comply 

with— 

VerDate Mar<15>2010 

10:12 Mar 18, 2014

Jkt 232046

PO 00000

Frm 00478

Fmt 8010

Sfmt 8010

Y:\SGML\232046.XXX

232046

pmangrum on DSK3VPTVN1PROD with CFR