Propellers – Propeller Hub – Inspection
Superseded. Comply with 2022-0061, which replaces this document.
- Published
- Effective
- Deadline
- Replaces
- 2020-0226-E
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators must amend the Aircraft Flight Manual before the next flight after 20 October 2020 and conduct visual inspections for cracks before each flight following abnormal vibrations. An NDT inspection must be performed within 20 flight hours after 20 October 2020 and during each overhaul of affected parts. Any cracked propeller hub must be replaced with a serviceable part before further flight.
Summary
EASA Airworthiness Directive 2020-0226R1 is an updated safety directive addressing inspection requirements for Hoffmann Propeller GmbH & Co. KG HO-V 72 propellers, commonly installed on Slingsby T67 Firefly aircraft. The directive mandates inspections to detect cracks in propeller hubs used in aerobatic maneuvers to prevent potential in-flight propeller detachment. It also requires amendments to the Aircraft Flight Manual for affected aircraft.
What changed
This revision removes the previously imposed 30-year life limit on affected propeller hubs and clarifies corrective actions required during overhaul inspections. It updates the Hoffmann Propeller Service Bulletin to Revision D and revises inspection and maintenance requirements accordingly. The directive supersedes the earlier Emergency AD 2020-0226-E.
Why it matters
This directive is critical for aviation professionals to ensure the continued airworthiness and safety of aircraft equipped with HO-V 72 propellers, particularly those performing aerobatic maneuvers. Operators and maintenance organizations must comply to detect and address cracks early, preventing potential propeller failure and associated risks to flight safety. Compliance ensures regulatory adherence and reduces the risk of in-flight incidents.
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