Interpretation ID: nht95-3.100

TYPE: INTERPRETATION-NHTSA

DATE: August 28, 1995

FROM: Joseph J. Smith -- Assistant Chief Maintenance Officer, Technical Services & Maintenance Support, Department of Buses, New York Transit Authority

TO: John Womack -- Office of Chief Counsel, NHTSA

TITLE: NONE

ATTACHMT: ATTACHED TO 9/29/95 LETTER FROM JOHN WOMACK TO JOSEPH J. SMITH (A43; STD. 302)

TEXT: Dear Mr. Womack:

I am requesting interpretation of NHTSA Standard No. 302; Flammability of interior materials (49 CFR Ch. V, 10-1-94 Edition, para. 571.302).

The Department of Buses, MTA New York City Transit, has been notified by a supplier of air conditioning (A/C) return air filters that their filters do not meet Standard No. 302.

The A/C filters that the DOB utilizes on RTS 04 and 06 model buses are located on the top of A/C evaporator coil. Although the A/C filters are not mentioned in para. S4.1 of the Standard No. 302, they may, in our opinion, be affected by requirements of para. S4.2, being separated from the bus interior only by a louvered panel. This area (which the filters occupy) cannot be clearly defined whether it falls into the category of occupant compartment air space.

The copies of some selected pages from the bus service and parts manuals are attached for your reference.

It would be greatly appreciated if you could clarify whether the A/C return air filters must conform to the Standard No. 302. If you need any additional information, please contact Sol. Zhodzishsky of my staff at tel. 718 927-7634 (fax 718 927-8079)

I would like also to thank Mr. Marvin Shaw for his expedient response to our verbal inquiries.

(MANUALS OMITTED.)