W-S-506B, FEDERAL SPECIFICATION: SPARK PLUG (15 JUN 1977) [NO S/S DOCUMENT]
W-S-506B, FEDERAL SPECIFICATION: SPARK PLUG (15 JUN 1977) [NO S/S DOCUMENT]., This specification covers spark plugs used on non-aircraft internal combustion engines requiring electric-spark ignition systems.
W-S-506 Rev. B
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