Interpretation ID: nht81-3.9

DATE: 08/20/81

FROM: AUTHOR UNAVAILABLE; F. Berndt; NHTSA

TO: Blue Bird Body Company -- Thomas D. Turner

TITLE: FMVSS INTERPRETATION

ATTACHMT: 4/26/76 letter from Frank Berndt to W G. Milby

TEXT:

This responds to your July 13, 1981, letter asking whether the joints in your school buses that fall within the rear cargo compartment or rear engine compartment must comply with Standard No. 221, School Bus Body Joint Strength.

Standard No. 221 applies to joints that connect body panels to body components. Body panels are defined to include those components that enclose the bus' occupant space. The agency has stated in the past that those portions of a bus falling below the floor level would not be considered as having a function in enclosing occupant space, and accordingly, joints in those area would not be required to comply with the standard's requirements.

Applying the standard to the joints that you question, appears that they would not be required to comply with the standard. The agency would consider the walls separating the cargo area or the engine from the remainder of the occupant compartment to be a continuation of the bus floor. Accordingly, joints falling behind and below those walls would not be required to comply with the standard. We do note, however, that the joints along the walls themselves must comply with the standard, since the wall panels enclose the occupant space and provide the separation of the engine or cargo area from the occupant space.

Sincerely,

Frank Berndt Chief Counsel

July 13, 1981

SUBJECT: FMVSS 221: 41 F.R. 3872, 1-27-76

REFERENCE: 1. Letter Frank Bernett to W.G. Milby dated 4-26-76; N40-30

Dear Mr. Berndt, Federal Motor Vehicle Safety Standard No. 221 School Bus Body Joint Strength covers body panel joints for body panels that enclose the bus occupant space. NHTSA has issued interpretations, see reference, that state components that are not considered to have a function in enclosing the occupant space (Example "...located entirely below the level of floor line...") are not considered a body component and are not subject to the standard.

The enclosed drawing 1034917 illustrates the configurations of a rear center luggage compartment and a rear engine "Pusher" bus. The cross-hatched areas of these cross-sectional views are the occupant space and body panels enclosing this occupant space are covered by the standard.

It is our interpretation that components located entirely within the shaded areas of the drawing, below the floor and below and/or to the rear of the walls between the occupant space and the compartments shown, do not enclose the occupant space, are not considered body components, and are not subject to the standard. Using this interpretation components such as trim panels inside the luggage compartment and panels forming the inner and outer skin of the body that are "located entirely" in the shaded area would not have to meet the joint strength requirements of FMVSS 221.

We feel that this interpretation conforms to the letter of the standard and subsequent interpretations and further conforms to the intent of the standard. We therefore request your early consideration of this matter and confirmation that our interpretation is correct.

Very truly yours,

Thomas D. Turner Manager, Engineering Services

slt

Enclosure

[April 26, 1976 letter from Frank Berndt to W. G. Milby omitted here]