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25 square inches. Te bottom of the opening shall be 30 inches, plus or minus 3 inches above the chamber floor. Ventilation openings shall be on the same side of the test chamber (See Figure 1). Tere shall be no ventilation openings along the length of the test

chamber. A forced-air ventilation system may not be used. Baffles shall be used to prevent wind from blowing directly into the ventilation openings.

Figure 2 Position ignition source with 18- inch dimension in contact with the seat cushion and touching the seat back. Center the bag on top of the cushion. (See Figure 2)

plus or minus 0.5 ounces.

D. Test Procedure 1. Install three seats in the test chamber at mini- mum spacing, per installer recommendation. Seats shall be perpendicular to the dimension indicated as “length” in Figure 1. Install so that seat frames will not fall during the test. Seat width shall be determined so that maximum passenger

capacity per row (two seats) for the seat style shall be tested 2. For each test, position the ignition source in the following

positions outlined. 3. A wooden match shall be used to light the ignition source.

Figure 3 Position the ignition source on the floor behind the seat with 18-

inch side resting on the floor and parallel to seat width, centered on width so that the rear of bab does not extend beyond the rear seat back. (See Figure 3)

Time the test, beginning when the ignition source catches fire and ending when all flames are extinguished. 4. After each ignition source position test, weigh the seat assembly, including loose material that has fallen off the seat onto the floor.

E. Performance Criteria For each ignition source position test, the seat tested must meet

all of the following criteria. A new seat specimen may be used for each ignition source position test. Maximum time from ignition to flameout shall be eight minutes. Flame shall not spread to any other seat with the ignition source

Figure 4 Position the ignition source on the floor on the aisle side of the

seat with 18-inch dimension on the floor and perpendicular to the seat width touching the seat leg, with centerline of the bag at the center of the seat back. (See Figure 4)

Camera View Area An opening covered with glass shall be provided at the midpoint of the test chamber length for camera viewing. Te opening shall allow the camera to view the seat parallel to the seat width (See Figure 1).

B. Test Sample Te sample shall be a fully assem- bled seat. Record the weight of all padding and upholstery prior to assembly. Record the weight of the fully assembled seat.

C. Ignition Source A paper grocery bag with dimensions of approximately 7 inches

by 11 inches by 18 inches is used to contain double sheets of news- print (black print only, approximately 22 inches by 28 inches). Te total combined weight of bag and newspaper shall be seven ounces,

in Position A and Position C. Weight loss may not exceed 10 percent of the pre-test weight of

padding and upholstery. Padding and upholstery may be combined in the form of integrally bonded seat foam.

Te bag burn test, as it has been come to be known, defines a fire

block seat cover, which provides an elevated flame barrier between a fire source and the much more flammable seat foam. Tis results in a seat intended to minimize the cause of an on-board fire and to maximize the amount of time available during an emergency evacuation. 

Test: Fire Block Test Evaluator: MGA Research Corporation Evaluatee: Heavy Duty Bus Parts Date: 2/7/2013 Results: Pass

Billingsley is the president of Heavy Duty Bus Parts, Inc., a provider of OEM and aftermarket component and manufacturer of seat covers based in Willis, Texas. 43

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