What was found
DURING HEAVY CHECK WAS REPORTED THAT BLACK SUBSTANCE ON FUEL LINES GAMMA COUPLING CONNECTIONS BEHIND FUEL PANEL 621AB. MAINTENANCE R & R FUEL LINES GAMMA COUPLING CONNECTIONS BEHIND FUEL PANEL 621AB IAW AMM 28-10-13.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DURING HEAVY CHECK WAS REPORTED THAT BLACK SUBSTANCE ON FUEL LINES GAMMA COUPLING CONNECTIONS BEHIND FUEL PANEL 621AB. MAINTENANCE R & R FUEL LINES GAMMA COUPLING CONNECTIONS BEHIND FUEL PANEL 621AB IAW AMM 28-10-13.