Request For Action Project: Systems/Instrument: Review: Date: Originator: F. Huegel Number: 2 Gamma-ray Large Area Space Telescope (GLAST) ACD Pre-Environmental Review (PER) June 8, 2005 Phone: 301-286-2285 Organization: GSFC/560 Category: Product Assurance Title: Fiber Stress Due Date: 7/31/2005 Action Get a fiber optics expert’s opinion on the integrity of the fiber Requested: optic bundle that had the broken fiber on it (Detector Assembly 230). Could there be any residual stress that could predispose other fibers in the bundle to fail? Supporting One fiber broke. Others could have been stressed. Rationale: Project Response: