AD NUMBER: 2017-24-08

PRODUCT: All Rolls-Royce plc (RR) RB211-535E4-37, RB211-535E4-B-37, and RB211-535E4-C-37 turbofan engines with certain low-pressure (LP) fuel filter-to-high-pressure (HP) fuel pump tube assemblies, or HP fuel pump-to-fuel flow governor (FFG) or FFG-to-HP pump inlet overspill return tube assemblies and flanged adaptor, installed.

ACTION: Final Rule.

SUMMARY: The FAA is superseding airworthiness directive (AD) 2014-24-08 for the engines listed above.

AD 2014-24-08 required replacing certain LP fuel filter-to-HP fuel pump tube assemblies.

This AD retains the requirement in AD 2014-24-08 to remove the LP fuel filter-to-HP fuel pump tube, adds new compliance thresholds, and requires installation of new HP fuel pump-to-FFG and FFG-to-HP pump inlet overspill return tube assemblies and flanged adaptor.

This AD was prompted by fuel leaks that have occurred at the flanged joints of the HP fuel pump-to-FFG tube assembly and FFG-to-HP pump inlet overspill return tube assembly.

COST: The FAA estimates that this AD affects 100 engines installed on airplanes of U.S. registry. The cost of compliance is estimated to be $18,522.50 per aircraft for parts and labor.

DATES: This AD is effective January 16, 2018.

FMI: AD