376 

14 CFR Ch. I (1–1–24 Edition) 

§ 25.1727 

will not prevent the continued safe op-
eration of the remaining powerplants 
or require immediate action by any 
crewmember for continued safe oper-
ation, in accordance with the require-
ments of § 25.903(b). 

(b) Design precautions must be taken 

to minimize hazards to the airplane 
due to EWIS damage in the event of a 
powerplant rotor failure or a fire origi-
nating within the powerplant that 
burns through the powerplant case, in 
accordance with the requirements of 
§ 25.903(d)(1). 

§ 25.1727

Flammable fluid shutoff 

means: EWIS. 

EWIS associated with each flam-

mable fluid shutoff means and control 
must be fireproof or must be located 
and protected so that any fire in a fire 
zone will not affect operation of the 
flammable fluid shutoff means, in ac-
cordance with the requirements of 
§ 25.1189. 

§ 25.1729

Instructions for Continued 

Airworthiness: EWIS. 

The applicant must prepare Instruc-

tions for Continued Airworthiness ap-
plicable to EWIS in accordance with 
Appendix H sections H25.4 and H25.5 to 
this part that are approved by the 
FAA. 

§ 25.1731

Powerplant and APU fire de-

tector system: EWIS. 

(a) EWIS that are part of each fire or 

overheat detector system in a fire zone 
must be fire-resistant. 

(b) No EWIS component of any fire or 

overheat detector system for any fire 
zone may pass through another fire 
zone, unless: 

(1) It is protected against the possi-

bility of false warnings resulting from 
fires in zones through which it passes; 
or 

(2) Each zone involved is simulta-

neously protected by the same detector 
and extinguishing system. 

(c) EWIS that are part of each fire or 

overheat detector system in a fire zone 
must meet the requirements of 
§ 25.1203. 

§ 25.1733

Fire detector systems, gen-

eral: EWIS. 

EWIS associated with any installed 

fire protection system, including those 
required by §§ 25.854 and 25.858, must be 
considered an integral part of the sys-
tem in showing compliance with the 
applicable requirements for that sys-
tem. 

Subpart I—Special Federal 

Aviation Regulations 

S

OURCE

: Docket No. FAA–2011–0186, Amdt. 

25–133, 76 FR 12555, Mar. 8, 2011, unless other-
wise noted. 

§ 25.1801

SFAR No. 111—Lavatory Oxy-

gen Systems. 

The requirements of § 121.1500 of this 

chapter also apply to this part. 

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