Pilatus PC-6 series Flight Controls - Flap Operating Mechanism Leaf Springs - Inspection/Replacement
- Published
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Pilatus PC-6 operators must perform a visual inspection of the leaf springs before the next flight after the effective date and repeat inspections every 25 flight hours. Any cracked springs must be replaced before further flight. Installation of the affected leaf springs is prohibited unless the inspection is completed. Compliance should follow the procedures in Pilatus PC-6 Service Bulletins No. 27-002 and No. 27-003.
Summary
EASA Safety Information Bulletin 2008-61 is an informational bulletin regarding the inspection and replacement of flap operating mechanism leaf springs on Pilatus PC-6 series aircraft. It references the Federal Office of Civil Aviation (FOCA) Switzerland Emergency Airworthiness Directive HB-2008-242, which applies to all Pilatus PC-6 models with specific leaf springs installed. The bulletin highlights a safety concern involving cracked or broken leaf springs that could lead to uncommanded flap retraction and potential loss of control.
What changed
This bulletin introduces mandatory initial and repetitive inspections of the flap operating mechanism leaf springs, part number 6232.0175.01, on Pilatus PC-6 aircraft. It requires replacement of any cracked or broken springs found during inspections. The bulletin also prohibits installation of the affected leaf springs without prior inspection.
Why it matters
This issue is critical for aviation professionals because a broken leaf spring in the flap mechanism can cause uncommanded flap retraction, posing a serious safety risk. Operators and maintenance organizations must ensure compliance to prevent hazardous flight conditions and maintain airworthiness. The bulletin informs stakeholders of the necessary inspections and replacements to mitigate this risk.
More for Pilatus PC-6
All 9- EASA AD 2021-0098Flight Controls / Stabilizers — Aileron, Elevator and Rudder Hinge Bolt Installations — Inspection / ModificationApr 9, 2021
- EASA AD 2020-0278Time Limits / Maintenance Checks – Airworthiness Limitations Section – AmendmentDec 14, 2020
- EASA AD 2020-0120Time Limits / Maintenance Checks – Airworthiness Limitations Section – AmendmentMay 27, 2020
- EASA AD 2018-0285Time Limits / Maintenance Checks – Airworthiness Limitations Section – AmendmentDec 20, 2018
- EASA AD 2018-0235Flight Controls — Flap Actuator / Pushrod Assembly Taper Pins — Inspection
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