393 

Federal Aviation Administration, DOT 

Pt. 25, App. F 

(c) Allowances must be made for such time 

delays in the execution of the procedures as 
may be reasonably expected to occur during 
service. 

(7) 

Installation and operation; standby power. 

The standby power unit and its installation 
must comply with paragraphs (a) and (b) of 
this section. 

(a) The standby power unit and its instal-

lation must not adversely affect the safety of 
the airplane. 

(b) The operation of the standby power 

unit and its control must have proven to be 
safe and reliable. 

[Amdt. 25–6, 30 FR 8468, July 2, 1965] 

A

PPENDIX

F 

TO

P

ART

25 

Part I—Test Criteria and Procedures for 

Showing Compliance With § 25.853 or § 25.855 

(a) 

Material test criteria

—(1) 

Interior com-

partments occupied by crew or passengers. 

(i) 

Interior ceiling panels, interior wall panels, 
partitions, galley structure, large cabinet 
walls, structural flooring, and materials used 
in the construction of stowage compart-
ments (other than underseat stowage com-
partments and compartments for stowing 
small items such as magazines and maps) 
must be self-extinguishing when tested 
vertically in accordance with the applicable 
portions of part I of this appendix. The aver-
age burn length may not exceed 6 inches and 
the average flame time after removal of the 
flame source may not exceed 15 seconds. 
Drippings from the test specimen may not 
continue to flame for more than an average 
of 3 seconds after falling. 

(ii) Floor covering, textiles (including 

draperies and upholstery), seat cushions, 
padding, decorative and non-decorative coat-
ed fabrics, leather, trays and galley fur-
nishings, electrical conduit, air ducting, 
joint and edge covering, liners of Class B and 
E cargo or baggage compartments, floor pan-
els of Class B, C, E, or F cargo or baggage 
compartments, cargo covers and trans-
parencies, molded and thermoformed parts, 
air ducting joints, and trim strips (decora-
tive and chafing), that are constructed of 
materials not covered in paragraph (a)(1)(iv) 
below, must be self-extinguishing when test-
ed vertically in accordance with the applica-
ble portions of part I of this appendix or 
other approved equivalent means. The aver-
age burn length may not exceed 8 inches, and 
the average flame time after removal of the 
flame source may not exceed 15 seconds. 
Drippings from the test specimen may not 
continue to flame for more than an average 
of 5 seconds after falling. 

(iii) Motion picture film must be safety 

film meeting the Standard Specifications for 
Safety Photographic Film PHI.25 (available 
from the American National Standards Insti-
tute, 1430 Broadway, New York, NY 10018). If 

the film travels through ducts, the ducts 
must meet the requirements of subparagraph 
(ii) of this paragraph. 

(iv) Clear plastic windows and signs, parts 

constructed in whole or in part of elas-
tomeric materials, edge lighted instrument 
assemblies consisting of two or more instru-
ments in a common housing, seat belts, 
shoulder harnesses, and cargo and baggage 
tiedown equipment, including containers, 
bins, pallets, etc., used in passenger or crew 
compartments, may not have an average 
burn rate greater than 2.5 inches per minute 
when tested horizontally in accordance with 
the applicable portions of this appendix. 

(v) Except for small parts (such as knobs, 

handles, rollers, fasteners, clips, grommets, 
rub strips, pulleys, and small electrical 
parts) that would not contribute signifi-
cantly to the propagation of a fire and for 
electrical wire and cable insulation, mate-
rials in items not specified in paragraphs 
(a)(1)(i), (ii), (iii), or (iv) of part I of this ap-
pendix may not have a burn rate greater 
than 4.0 inches per minute when tested hori-
zontally in accordance with the applicable 
portions of this appendix. 

(2) 

Cargo and baggage compartments not oc-

cupied by crew or passengers. 

(i) [Reserved] 
(ii) A cargo or baggage compartment de-

fined in § 25.857 as Class B or E must have a 
liner constructed of materials that meet the 
requirements of paragraph (a)(1)(ii) of part I 
of this appendix and separated from the air-
plane structure (except for attachments). In 
addition, such liners must be subjected to 
the 45 degree angle test. The flame may not 
penetrate (pass through) the material during 
application of the flame or subsequent to its 
removal. The average flame time after re-
moval of the flame source may not exceed 15 
seconds, and the average glow time may not 
exceed 10 seconds. 

(iii) A cargo or baggage compartment de-

fined in § 25.857 as Class B, C, E, or F must 
have floor panels constructed of materials 
which meet the requirements of paragraph 
(a)(1)(ii) of part I of this appendix and which 
are separated from the airplane structure 
(except for attachments). Such panels must 
be subjected to the 45 degree angle test. The 
flame may not penetrate (pass through) the 
material during application of the flame or 
subsequent to its removal. The average 
flame time after removal of the flame source 
may not exceed 15 seconds, and the average 
glow time may not exceed 10 seconds. 

(iv) Insulation blankets and covers used to 

protect cargo must be constructed of mate-
rials that meet the requirements of para-
graph (a)(1)(ii) of part I of this appendix. Tie-
down equipment (including containers, bins, 
and pallets) used in each cargo and baggage 
compartment must be constructed of mate-
rials that meet the requirements of para-
graph (a)(1)(v) of part I of this appendix. 

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