aft Service Change (ASC) No. 166 subject: EXHAUST (ATA-78), THRUST REVERSER SECONDARY LOCK AND WHEEL SPIN UP-- MODIFICATION dated August 17, 1990; GAC G-IV Wiring Diagram Manual drawing L159AV40137, Landing Gear Indicator System (sheet 1 of - 1) 32-6-1, Page ), dated January 19/90; GAC G-IV Wiring Diagram Manual drawing 115