FIREPROOF AND FIRE RESISTANT MATERIALS

Federal Aviation Administration

Project Manager: J. ReinhardtWilliam J. Hughes Technical Center

Airport and Aircraft SafetyResearch and Development Division

Atlantic City International Airport, NJ

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.

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 .

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 ) .

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.

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.