EASA AD DCA-750XL-33A
Aileron Pivot Fork Assembly — Inspection
Summary
The Airworthiness Directive DCA/750XL/33A issued by the Civil Aviation Authority of New Zealand mandates inspection and modification of the aileron pivot fork assembly on Pacific Aerospace Limited 750XL aircraft, specifically all serial numbers up to and including 220, 8001, and 8002. This directive requires operators to inspect the bearing assemblies on both starboard and port control columns and to implement retaining features as detailed in Pacific Aerospace Mandatory Service Bulletin PACSB/XL/115 issue 3 dated 21 January 2019.
What Changed
DCA/750XL/33A revises the previous directive by mandating compliance with the updated Pacific Aerospace Mandatory Service Bulletin PACSB/XL/115 issue 3, which introduces an alternate washer part number AN960-516 replacing AN960-516L. It also continues the use of alternate bolts introduced in issue 2 of the service bulletin. The directive requires additional retaining features to be installed on the aileron pivot fork bearings to prevent bearing migration.
Why It Matters
This directive addresses a safety concern where the outer race of the bearing was found migrating out of the aileron pivot fork, which could compromise control column integrity. For operators and maintenance organizations, complying with this directive ensures continued airworthiness and safety of the 750XL aircraft. It also provides a terminating action upon completion of the required modifications, simplifying ongoing maintenance compliance.
What To Do
Operators must inspect the bearing assemblies on both starboard and port control columns at every daily inspection until the retaining features are installed. The retaining features must be installed within 165 hours time in service after 20 December 2018, following the instructions in Part B of the PACSB/XL/115 issue 3 service bulletin. Visual inspections can be performed and certified by appropriately trained and authorized pilots under specific provisions, and all maintenance actions must be recorded and certified as required.
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