What was found
INVESTIGATED REPORTED ENGINE ANTI-ICE SYS FAIL INDICATION. FOUND (1) HEATING ELEMENT OPEN IN RT INBD WING L/E ANTI-ICE PANEL. ALSO NOTED FAULT IN RT WING L/E ANTI-ICE JUNCTION BOX CURRENT SENSOR CS10. FURTHER TROUBLESHOOTING REVEALED THE WIRING TERMINALS, ATTACHING HARDWARE, AND ADJACENT WIRING FOR THE RT INBD WING ANTI-ICE SEVERELY CORRODED AND DAMAGED AT THE AIRFRAME GROUND POINTS GND076 AND GT006. REQUIRED REPAIR/REPLACEMENT OF THE AIRFRAME GROUND POINTS AND WIRING, REPLACEMENT OF THE CS10 CURRENT SENSOR, AND REPLACEMENT OF THE RT INBD WING L/E PANEL. DUE TO FINDINGS INSPECTED THE LT WING INBD ANTI-ICE WIRING AIRFRAME GROUND CONNECTIONS GND75 AND GND79 AND FOUND CORRODED ALSO, TO A LESSER EXTENT. REPLACED THE WIRING TERMINALS AND ATTACHING HARDWARE AS REQUIRED AT GND75 AND GND79 LT WING L/E ANTI-ICE WIRING GROUNDING CONNECTIONS. INTEGRATED ENGINE ANTI-ICE/INBD WING ANTI-ICE SYS CHECKS SATISFACTORY FOLLOWING REPAIRS. THE PHASE 5 3-YEAR/1200 HR. INSP GUIDE ITEM A531003 REQUIRES A GENERAL INSP OF TAILCONE WIRING IAW THE MM TASK CODE 53-20-04-210. THE AREAS INVOLVED ARE NOT EASILY ACCESSIBLE FOR INSPECTIONS OR REPAIRS. RECOMMEND MFG INVESTIGATE IF AN ISOLATED OCCURRENCE OR WHETHER AN ADDITIONAL SPECIFIC INSP GUIDE ITEM FOR THE INBD L/E ANTI-ICE WIRING NEEDS TO BE ADDED TO THE PHASE 5 INSP GUIDE OR INSPECTED MORE FREQUENTLY.