D. Gross

Quantitative measurements of the total heat release from weight selected building materials were made during an interlaboratory study of the Potential Heat Test Method. Statistical analysis of the results indicates that a higher degree of variability existed among the nine participating laboratories than would be expected of a single laboratory performing standardized oxygen bomb calorimeter determinations of the heat of combustion. It was noted the majority of laboratories tended to rank the materials in the same order, or in an order, which could be made the same by a ranking change of a single materials

Robert F. Salmon

An airborne type thrust measuring instrument was developed and subsequently tested on both a General Electric J79-GE-8 turbojet engine mounted on a thrust stand in a laboratory altitude cell and a Pratt and Whitney JT3C-7 turbojet engine aboard a Boeing 720 aircraft. The thrust meter system using measurements of internal engine pressures, ambient altitude pressure and a total air temperature, computed engine gross thrust, net thrust and percent of maximum continuous rated thrust at the operating flight condition.

Laboratory tests indicated that : (1) the gross thrust value computed theoretically from the measured pressures were within _+2.0% of the thrust stand measured gross thrust (2) the thrust meter gross thrust values were within _+3.0% of the thrust stand measured values, (3) the net thrust values of the thrust stand measured net thrust, and (4) the thrust meter net thrust values were within _+4.2% of the thrust stand measured net thrust. The gross thrust computer module malfunctioned for a series of tests at a simulated altitude condition of 40,000 feet and Mach 1.2.

Flight test results indicated that the system functioned properly abroad the aircraft and was responsive to small changes in engine power setting. The thrust meter gross thrust and net thrust values agreed with the computed gross and net thrust of the engine within _+2.2% and _+2.8% respectively. In measuring net thrust during the flight tests, some difficulty was encountered in obtaining consistent static pressure readings at the compressor inlet station thus causing errors in the computation of ram drag.

Julius J. Gassmann

An investigation was made to determine the requirements for protecting large cargo aircraft against in-flight cargo fires. Tests were conducted within an instrumented fuselage of a large cargo aircraft using ordinary packing material as cargo. These tests demonstrated the need for suitable means, air-flow shutoff controls and adequate insulation properly installed.A procedure was developed which may be useful in conducting in-flight certification tests on smoke detection system installations. A method of generating the smoke was selected on the basis of uniformity, cleanliness and freedom from odor as a result of its use during evaluation.

John F. Marcy

A recent survivable crash landing of a Boeing 727 transport airplane resulted in heavy loss of life to passengers from exposure to fire and combustion products within the cabin. As a result of extensive fire damage sustained by the cabin interior materials, attention has been directed to possible deficiencies in the flame/fire resistance of the materials as an important factor affecting the safety of passengers on the flammability, smoke and toxic characteristics of the cabin materials presumably involved in the Salt Lake City crash of November 1965. Smoke and toxic data was obtained separately and concurrently with the cooperation of the Bureau of Standards and is contained in a separate report.

D. Gross, T.G. Lee, J.J. Loftus

Smoke measurement and an indication of the concentrations of some toxic decomposition products resulting from open flaming and smoldering combustion of 15 aircraft finish materials are reported. Charts and tables are included to facilitate estimating approximate smoke and gas concentration which might exist in aircraft during an assumed fire exposure.