ANNEX 1 FIRE PROTECTION TEST PROCEDURE

Acceptable test procedure for self-extinguishing materials for compliance with Ch 8, 104. and 105.

1. Conditioning

Specimens should be conditioned to 21±15℃(70±5℉), and at 50±5 % relative humidity until mois- ture equilibrium is reached or for 24 hours. Only one specimen at a time may be removed from the conditioning environment immediately before subjecting it to the flame.

2. Specimen configuration

Except as provided for materials used in electrical wire and cable insulation and in small parts, materials should be tested either as a section cut from a fabricated part as installed in the WIG craft or as a specimen simulating a cut section, such as a specimen cut from a flat sheet of the material or a model of the fabricated part. The specimen may be cut from any location in a fab- ricated part; however, fabricated units, such as sandwich panels, may not be separated for a test.

The specimen thickness should be no thicker than the minimum thickness to be qualified for use in the WIG craft, except that :

(1) Thick foam parts, such

(2) When compliance with

as seat cushions, should be tested in 1.3 cm;

Ch 8, 104. 3 (4) for materials used in small parts that should be test-

ed, the materials should be tested in no more than 0.32 cm;

(A) In the vertical tests of para. 4, the two long edges and the upper edge are to be held se- curely;

(B) In the horizontal test of para. 5, the two long edges and the edge away from the flame are

to be held securely;

(C) The exposed area of the specimen is to be at least 5.08 cm wide and 30.48 cm long, unless the actual size used in the WIG craft is smaller; and

(D) The edge to which the burner flame is applied should not consist of the finished or pro- tected edge of the specimen but should be representative of the actual cross section of the

material or part installed in the WIG craft. When performing the test prescribed in para. 6

of this Annex, the specimen should be mounted in metal frame so that all four edges are held securely and the exposed area of the specimen is at least 20.3 cm × 20.3 cm.

3. Apparatus

Except as provided in para. 7, tests should be conducted in accordance with the Federal Test Method Standard 1971 Method 5903 (revised Method 5902), or with some other approved equiv- alent method. Specimens which are too large for the cabinet should be tested in similar draft-free conditions.

4. Vertical test

A minimum of three specimens should be tested and the results averaged. For fabrics, the direction of weave corresponding to the most critical flammability conditions should be parallel to the lon- gest dimension. Each specimen should be supported vertically. The specimen should be exposed to a Bunsen or Tirrill burner with a nominal 0.95 cm tube adjusted to give a flame of 3.8 cm in height. The minimum flame temperature measured by a calibrated thermo-couple pyrometer in the

center of the flame should be 843℃(1550℉). The lower

above the top edge of the burner. The flame should be

edge of the specimen should be 1.9 cm applied to the center line of the lower

edge of the specimen. For materials covered by Ch 8, 104. 3 (1) and 5, the flame should be ap-

plied for 60 seconds and then removed. For materials covered by Ch 8, 104. 3 (2), the flame should be applied for 12 seconds and then removed. Flame time, burn length, and flaming time of

drippings, if any, should be recorded. The burn length determined in accordance with para 8 should

be measured to the nearest 2.5 mm.

Guidance for WIG ships(Wing-In-Ground Effect Ships) 2012 57

5. Horizontal test

A minimum of three specimens should be tested and the results averaged. Each specimen should be supported horizontally. The exposed surface when installed in the WIG craft should be face down for the test. The specimen should be exposed to a Bunsen burner or Tirrill burner with a nominal 9ur.5edmmby tuabecaaldibjurasted ttohegrimveocaouflpalme epyorfom3e.8tercmin intheheciegnhtte.r Tohf ethme infliammuemshfolaumlde bteem8p4e3r℃atu(r1e55m0℉eas).- The specimen should be positioned so that the edge being tested is 1.9 cm above the top of, and on the center line of, the burner. The flame should be applied for 15 seconds and then removed. A minimum of 25.4 cm of the specimen should be used for timing purposes, approximately 3.8 cm should burn before the burning front reaches the timing zone, and the average burn rate should be recorded.

6. Forty-five degree test

A minimum of three specimens should be tested and the results averaged. The specimens should be supported at an angle of 45 degrees to a horizontal surface. The exposed surface when installed in the aircraft should be face down for the test. The specimens should be exposed to a Bunsen or Tirrill burner with a nominal 9.5 mm tube adjusted to give a flame of 3.8 cm in height. The mini- mum flame temperature measured by a calibrated thermocouple pyrometer in the center of the flame should be 843℃(1550℉). Suitable precautions should be taken to avoid drafts. The flame should be applied for 30 seconds with one-third contacting the material at the center of the speci- men and then removed. Flame time, glow time, and whether the flame penetrates (passes through) the specimen should be recorded.

7. Sixty-degree test

A minimum of three specimens of each wire specification (make and size) should be tested. The specimen of wire or cable (including insulation) should be placed at an angle of 60 degrees with the horizontal in the cabinet specified in para. 7, with the cabinet door open during the test or placed within a chamber approximately 61 cm high × 30.5 × 30.5 cm, open at the top and at one vertical side (front), that allows sufficient flow of air for complete combustion but is free from drafts. The specimen should be parallel to and approximately 15.2 cm from the front of the chamber. The lower end of the specimen should be held rigidly clamped. The upper end of the specimen should pass over a pulley or rod and should have an appropriate weight attached to it so that the specimen is held tautly throughout the flammability test. The test specimen span between lower clamp and upper pulley or rod should be 61 cm and should be marked 20.4 cm from the

lower end to

burner should neath the test

indicate the central point for flame application. A flame from a Bunsen or Tirrill

be applied for 30 seconds at the test mark. The burner should be mounted under- mark on the specimen, perpendicular to the specimen and at an angle of 30 degrees

to the vertical plane of the specimen. The burner should have a nominal bore of 9.5 mm, and

should be adjusted to provide a 7.6 cm high flame with an inner cone approximately one-third of the flame height. The minimum temperature of the hottest portion of the flame, as measured with a calibrated thermocouple pyrometer, may not be less than 954℃(1750℉). The burner should be positioned so that the hottest portion of the flame is applied to the test mark on the wire. Flame time, burn length, and flaming time of drippings, if any, should be recorded. The burn length de- termined in accordance with para. 8 of this appendix should be measured to the nearest 2.5 mm. Breaking of the wire specimen is not considered a failure.

8. Burn length

Burn length is the distance from the original edge to the farthest evidence of damage to the test specimen due to flame impingement, including areas of partial or complete consumption, charring, or enbrittlement, but not including areas sooted, stained, warped, or discolored, nor areas where ma- terial has shrunk or melted away from the heat source.

58 Guidance for WIG ships(Wing-In-Ground Effect Ships) 2012