MIL-W-9880A, WIRING HARNESS, IGNITION, LOW-TENSION, REWIREABLE, AIRCRAFT RECIPROCATING ENGINES, GENERAL SPECIFICATION FOR (22 FEB 1971)., This specification establishes the requirements for procurement of low tension,rewirable, ignition harnesses for aircraft reciprocating engines.The iflition harnesses shall be of one grade and shall be of the size specifiedherein.