Interpretation ID: aiam1731
Engineering Manager
Tridon Limited
Box 5029
Burlington
Ontario
Canada;
Dear Mr. McDonald: This is in reply to your letter of December 6, 1974 to this offic requesting clarification of Motor Vehicle Safety Standard No. 108.; You are correct in your interpretations numbered 1, 2, and 3. Th applicable SAE Standard or Recommended Practice for a turn signal flasher is J590b, October 1965, and for a vehicular hazard warning signal flasher is J945, February 1966. The footnote 'See S4.4.2' is in error and should be deleted.; You are incorrect in your interpretation No. 4. Paragraph S4.4.1 allow use of a combination turn signal flasher-hazard warning signal flasher if the requirements of both J590b and J945 are met. The correct testing sequence is as follows: (1) for performance as a turn signal flasher, (2) for performance as a hazard warning signal flasher, (3) for durability as a turn signal flasher, and (4) for durability as a hazard warning signal flasher.; Yours truly, Richard B. Dyson, Acting Chief Counsel