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Interpretation ID: nht75-1.4

DATE: 02/07/75

FROM: AUTHOR UNAVAILABLE; R. B. Dyson; NHTSA

TO: Fiat - Research and Development

TITLE: FMVSS INTERPRETATION

TEXT:

FEB 7 1975 N40-30 TWH

Mr. Alberto Negro, Director Fiat Research & Development Parklane Towers West One Parklane Boulevard Dearborn, Michigan 48126

Dear Mr. Negro:

This responds to your December 30, 1974, question whether the requirement of S5.3.2 of Standard No. 105-75, Hydraulic brake systems, would be satisfied by the use of a 4- to 8-second activation of the brake indicator lamp, activated when the ignition switch is placed in the "on" position. S5.3.2. requires:

S5.3.2 All indicator lamps shall be activated as a check of lamp function either when the ignition (start) witch is turned to the "on", (run) position when the engine is not running, or when the ignition (start) switch is in a position between "on" (run) and "start" that is designated by the manufacturer as a check position.

A 4- to 8-second activation when the ignition switch is placed in the "on" position as a check of brake indicator lamp function would satisfy the requirements of S5.3.2.

Yours truly,

Richard B. Dyson Acting Chief Counsel