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Random Vibration and Torque Tests of Fasteners Secured With Locking Cable, Room Temperature Vulcanized (RTV) Rubber, and Closed Cell Foam to Support the Launch of STS-82During a walkdown of the Space Transportation System (STS) orbiter for the 82nd Space Shuttle flight (STS-82), technicians found several safety cables for bolts with missing or loose ferrules. Typically, two or three bolts are secured with a cable which passes through one of the holes in the head of each bolt and a ferrule is crimped on each end of the cable to prevent it from coming out of the holes. The purpose of the cable is to prevent bolts from rotating should they become untightened. Other bolts are secured with either a locking cable or wire which is covered with RTV and foam. The RTV and foam would have to be removed to inspect for missing or loose ferrules. To determine whether this was necessary, vibration and torque test fixtures and tests were made to determine whether or not bolts with missing or loose ferrules would unloosen. These tests showed they would not, and the RTV and foam was not removed.
Document ID
19970034682
Acquisition Source
Marshall Space Flight Center
Document Type
Technical Memorandum (TM)
Authors
Yost, V. H. (NASA Marshall Space Flight Center Huntsville, AL United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1997
Subject Category
Space Transportation
Report/Patent Number
NAS 1.15:108539
NASA-TM-108539
Accession Number
97N29923
Funding Number(s)
PROJECT: RTOP 250-40-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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