AN ASSESSMENT OF THE STRUCTURAL MODIFICATIONS OF THE GRUMMAN FLXIBLE 870 ADVANCED DESIGN BUS

This report on the adequacy of the structural modifications to the Grumman Flxible 870 Advanced Design Bus was made at UMTA's request. Structural fatigue had developed in the A-frame, engine cradle, trunnion, front mechanical assembly and coach body of this lightweight model within 2 years after the first of them had gone into service. By December 1980 a thousand of the 2800 then delivered had been removed from service and the manufacturer had undertaken an analysis of the problem and development of a correction which involved welding reinforcements on the structures and improving weld quality control. Grumman modified all the buses it had delivered and vehicles on the production line were appropriately modified. The TSC structural analysis is described and modifications were checked to determine if they would permit a targeted service life of 500,000 miles. It was concluded that this service life could be achieved.

  • Corporate Authors:

    Transportation Systems Center

    55 Broadway, Kendall Square
    Cambridge, MA  United States  02142

    Urban Mass Transportation Administration

    400 7th Street, SW
    Washington, DC  United States  20590
  • Publication Date: 1982-3-5

Media Info

  • Features: References;
  • Pagination: n.p.

Subject/Index Terms

Filing Info

  • Accession Number: 00390691
  • Record Type: Publication
  • Files: TRIS, USDOT
  • Created Date: Dec 30 1984 12:00AM