R.J. Palmer

Preliminary screening flame impingement tests with temperature adjusted to 3500 degree at impact surface from an oxygen acetylene torch was applied to a number of additional materials since issuance of LR-AD-1463 on 3/16/62. Results of these tests are reported in this addendum.

George Prill

New or revised material enclosed in black brackets on the pages submitted on the pages submitted with this supplement except the pages in the addendum containing the preambles of amendments.

D. Gross

This report describes experiments performed over a period of several years to obtain fundamental information on the burning characteristics of cross piles of wood.

A.F. Robertson

The flammability of solids may be considered as a function of the ratio of heat release rate to critical ignition energy of the material being studied. The radiant panel flammability test method, based on the concept, has shown its usefulness as a research tool. A review of previous studies made by this method is included.

Recently obtained experimental data are presented which illustrate the large changes in flammability that can occur with changes in the relative humidity of the ambient conditioning atmosphere. Data presented suggest that the subsurface heat dissipation behavior of the material under test may have an important influence on flammability.

The paper concludes with the suggestion that, although the radiant panel flammability test method has achieved some recognition, it would be a mistake to assume that it, or any other test method would be ideal for prediction of the surface flammability hazard of all materials in all situations.

George Prill

This release transmits, as Amendment A, acceptable test procedure for demonstrating compliance with the fire protection requirements as they relate to airframe materials.