1. FIREPROOF AND FIRE RESISTANT MATERIALS Federal Aviation Administration Project Manager: J. Reinhardt William J. Hughes Technical Center Airport and Aircraft Safety Research and Development Division Atlantic City International Airport, NJ

2. PURPOSE An ARAC Subcommittee is looking at revising AC25-135 (Powerplant Installation and Propulsion System Component Fire Protection Test Methods, Standards, and Criteria) Develop a means to comply with the AC in order to evaluate various test specimens to determine whether they may be classified as: –Fireproof –Fire Resistant Determine the feasibility of the testing methods performed.

3. Current Proposed Procedure CALIBRATION OF THERMOCOUPLES Preheat Burner for 2 minutes. Place Flame on Thermocouples for 90 seconds. All Thermocouples must read 2000°F +/- 150°F.

4. Current Proposed Procedure CALIBRATION OF CALORIMETERS Preheat Burner for 2 minutes. Place Flame on Calorimeters for 90 seconds. All Calorimeters must read above 10 BTU/(ft²·sec ).

5. Current Proposed Procedure BURNER TEST Preheat Flame for 2 minutes. Place Flame for 16 minutes on the various test specimens: 4140 Steel (reference material) 1.15-5 PH Steel 2.Titanium 6A1-4V 3.Inconel 718 4.Aluminum 7075 Record time temperature data at the 0%, 25%, 50%, 75%, and 100% positions of the diameter. Determine the loss of Ultimate Strength at the 5 minute and 15 minute intervals.

6. Status TESTING Three out of the five material selected have been tested according to the prescribed procedure (4130 Steel, 15-5 PH Steel, and Titanium 6A1-4V). Available test data is currently been analyzed (reference material) PROCEDURE ARAC Subgroup is currently looking at the data to determine if a test protocol change is required.