George B. Geyer

Full-scale tests were conducted under fixed fire conditions employing air-aspirating foam and dry powder dispensing equipment in which six different foam agents and three different dry chemical powders were evaluated, both alone and in combination. The time required to control circular pool fires of 40, 60, and 80 feet in diameter, containing an obstacle and a three-dimensional fire, was determined.

William A. Hiering, Charles R. Grisel

Wet and dry runway friction tests were conducted on bituminous concrete Runway 18-36 at Washington National Airport using a Fixed Slip Runway Friction Tester. These tests were conducted to determine if significantr friction changes were generated at a result of grooving the runway surface with 1/8 by 1/8 inch tranverse grooves spaced on 1-inch centers. Data analysis indicates that at test speeds of 10 to 60 mph, no appreciable increase or decrease in overall runway friction values was obtained for this series of tests. The treatment of the runway surface, however, by the cutting of uniformly spaced grooves markedly smoothed the resultant wet runway firction values. It is hypothesized that these smoother wet runway friction values result in a surface that affords more efficient operation of aircraft antiskid braking devices and more effective manual braking.

Paul M. Rich

Two types of experimental 20-channel flight data recorders were evaluated to determine their resistance to an aircraft crash environ mente This crash environment was simulated by a series of four test a shock test. a crushing test, a penetration test, and a fire test. The first flight data recorder tested was an oscillographic .recorder enveloped in a 1/2 ATR (Air Transport Radio) casej the recording medium being stainless steel tape. This recorcter survived all the tests except the shock test in the longitudinal direction. A minor modification to the recorder would correct this fault. The second type of recorder was a magnetic tape recorder. This recorder was also destroyed in the longitudinal shock test. A major redesign would be required for this recorder to survive this test.. It was concluded that the series of four crash survivability tests are poorly defined and recommendations are made herein to correct this problem.

J.F. Marcy

To update Report NA-68-30, Flaming and Self Extinguishing characteristics of aircraft cabin interior materials to include data on additional materials tested of particular interest to the formulation of new standards.

To present comparative flame-spread index data from several different laboratories on the same materials using the Radiant Panel Test Apparatus

Federal Aviation Administration Department

The purpose of these amendments is to improve the emergency evacuation equipment requirements and operating procedures for transport category airplanes.