AD NUMBER: 2020-04-20

PRODUCT: Certain De Havilland Aircraft of Canada Limited Model DHC-8-400 series airplanes.

ACTION: Final rule

SUMMARY: This AD was prompted by reports of wear on fuel couplings, bonding springs, and sleeves as well as fuel tube end ferrules and fuel component end ferrules.

This AD requires repetitive inspections of certain parts for discrepancies that meet specified criteria, and replacement as necessary; repetitive inspections of certain parts for damage and wear, and rework of parts; and electrical bonding checks of certain couplings.

This AD also requires revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. For certain airplanes, this AD allows a modification that would terminate the repetitive inspections.

DATES: This AD is effective May 4, 2020.

COST: The FAA estimates that this AD affects 52 airplanes of U.S. registry. Operators may incur the following costs in order to comply with this AD:

Required Actions

• Labor: 268 work-hours × $85 per hour = $22,780 per airplane.

Optional Actions

• Labor: 525 work-hours × $85 per hour = $44,625 per airplane.
• Parts: $20,906.
• Cost per Airplane: $65,531.

FMI: AD