375 

Federal Aviation Administration, DOT 

§ 25.1725 

operating rules, or as a result of the as-
sessment required by § 25.1709, EWIS 
components associated with those sys-
tems must be specifically identified 
with component part number, function, 
and separation requirement for bun-
dles. 

(1) The identification must be placed 

along the wire, cable, or wire bundle at 
appropriate intervals and in areas of 
the airplane where it is readily visible 
to maintenance, repair, or alteration 
personnel. 

(2) If an EWIS component cannot be 

marked physically, then other means 
of identification must be provided. 

(c) The identifying markings re-

quired by paragraphs (a) and (b) of this 
section must remain legible through-
out the expected service life of the 
EWIS component. 

(d) The means used for identifying 

each EWIS component as required by 
this section must not have an adverse 
effect on the performance of that com-
ponent throughout its expected service 
life. 

(e) Identification for EWIS modifica-

tions to the type design must be con-
sistent with the identification scheme 
of the original type design. 

§ 25.1713

Fire protection: EWIS. 

(a) All EWIS components must meet 

the applicable fire and smoke protec-
tion requirements of § 25.831(c) of this 
part. 

(b) EWIS components that are lo-

cated in designated fire zones and are 
used during emergency procedures 
must be fire resistant. 

(c) Insulation on electrical wire and 

electrical cable, and materials used to 
provide additional protection for the 
wire and cable, installed in any area of 
the airplane, must be self-extin-
guishing when tested in accordance 
with the applicable portions of Appen-
dix F, part I, of 14 CFR part 25. 

§ 25.1715

Electrical bonding and pro-

tection against static electricity: 
EWIS. 

(a) EWIS components used for elec-

trical bonding and protection against 
static electricity must meet the re-
quirements of § 25.899. 

(b) On airplanes having grounded 

electrical systems, electrical bonding 

provided by EWIS components must 
provide an electrical return path capa-
ble of carrying both normal and fault 
currents without creating a shock haz-
ard or damage to the EWIS compo-
nents, other airplane system compo-
nents, or airplane structure. 

§ 25.1717

Circuit protective devices: 

EWIS. 

Electrical wires and cables must be 

designed and installed so they are com-
patible with the circuit protection de-
vices required by § 25.1357, so that a fire 
or smoke hazard cannot be created 
under temporary or continuous fault 
conditions. 

§ 25.1719

Accessibility provisions: 

EWIS. 

Access must be provided to allow in-

spection and replacement of any EWIS 
component as necessary for continued 
airworthiness. 

§ 25.1721

Protection of EWIS. 

(a) No cargo or baggage compartment 

may contain any EWIS whose damage 
or failure may affect safe operation, 
unless the EWIS is protected so that: 

(1) It cannot be damaged by move-

ment of cargo or baggage in the com-
partment. 

(2) Its breakage or failure will not 

create a fire hazard. 

(b) EWIS must be designed and in-

stalled to minimize damage and risk of 
damage to EWIS by movement of peo-
ple in the airplane during all phases of 
flight, maintenance, and servicing. 

(c) EWIS must be designed and in-

stalled to minimize damage and risk of 
damage to EWIS by items carried onto 
the aircraft by passengers or cabin 
crew. 

§ 25.1723

Flammable fluid fire protec-

tion: EWIS. 

EWIS components located in each 

area where flammable fluid or vapors 
might escape by leakage of a fluid sys-
tem must be considered a potential ig-
nition source and must meet the re-
quirements of § 25.863. 

§ 25.1725

Powerplants: EWIS. 

(a) EWIS associated with any power-

plant must be designed and installed so 
that the failure of an EWIS component 

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