AD NUMBER: 2016-11-07

PRODUCT: Certain Boeing 777-200 and -300 series airplanes equipped with Pratt and Whitney engines.

ACTION: Final Rule

SUMMARY: This AD was prompted by reports of blocked drain lines at the engine forward strut that caused flammable fluid to accumulate in a flammable leakage zone.

This AD requires doing the following actions on the left strut and right strut: A one-time cleaning of certain forward strut drain lines; installing new forward strut drain lines and insulation blankets; a leak check of the forward strut drain lines; and repair if any leak is found.

This AD also requires revising the maintenance or inspection program, as applicable, to incorporate a certain airworthiness limitation.

The FAA is issuing this AD to prevent blockage of forward strut drain lines. This condition could cause flammable fluids to collect in the forward strut area and potentially cause an uncontrolled fire or cause failure of engine attachment structure and consequent airplane loss.

DATES: This AD is effective July 12, 2016.

FMI: AD