Page:NTSB RAR-81-4.pdf/49

-44- APPENDIX H

STRUCTURAL TESTING - TRAILER CAR

VOM (Empty, Ready to Run) F Conducted May 26, 1975

Deflection 2 MM on left side (looking aft)

1 MM on right side

VOM Plus Overload - Conducted May 27, 1975

Deflection - 3 MM left Deflection is total from basic car shell weight of 2.5 MM right12,686 KG

Camber was checked at VOM plus overload by means of a taunt wire strung between bolsters under center sill - plus 9.75 MM.

800K Compression Test - Conducted May 29, 1975.

Test results were not satisfactory - two different locations of sirain gages showed readings up to 62.6 KG/MM$2$ on material capable of 36 KG/MM$2$. Location was in the tapered section of center sill at the base of the "H" coupler structure.

800K Test was reconducted June 13 after beef up of discrepant section. Test was successful. "B" end of power cars and both ends of trailer cars and food service cars, will represent this redesign.

500K Test was conducted June 18, 1975, and was successful.

Natural frequency test was conducted June 20, 1975.

Results are being clarified by AMF and will appear in official AMF test report.

Structural Testing - Collision Posts

Test was conducted April 11, 1975.

Test was made on a mockup representing the two collision posts with the two posts facing each other and held together at the top and bottom with cross pieces.

A 150K load was applied 18" above lower attachment with no failure.

A 300K load was applied at the base with no failure.