EASA SIB 2007-28
Improper repair of Messier-Bugatti hydraulic pumps, installed on Eurocopter AS332 helicopters - DGAC France AD F-2007-010
Summary
EASA Airworthiness Directive F-2007-010 addresses the improper repair of Messier-Bugatti hydraulic pumps installed on Eurocopter AS332 helicopter models including AS 332 C, C1, L, L1, and L2. The directive identifies specific part and serial numbers of affected hydraulic pumps that have experienced seal deterioration due to incorrect liner positioning during repair. This issue has led to loss of hydraulic power systems on affected helicopters.
What Changed
This new Airworthiness Directive prohibits flight operations on Eurocopter AS332 helicopters fitted with the identified faulty Messier-Bugatti hydraulic pumps unless at least one pump is replaced with a compliant unit. It mandates inspection of installed and spare hydraulic pumps within 15 flying hours and requires removal of affected pumps by December 31, 2008. The directive also requires returning non-compliant pumps for repair to meet airworthiness standards.
Why It Matters
This directive is critical for aviation professionals as it addresses a serious safety risk involving hydraulic system failures that can compromise flight safety. Operators and maintenance organizations must ensure compliance to prevent hydraulic power loss during flight. Compliance teams need to track affected serial numbers and enforce timely inspections and replacements to maintain regulatory adherence and aircraft airworthiness.
What To Do
Operators must check the part and serial numbers of installed hydraulic pumps within 15 flying hours and suspend flights if both pumps are affected until replacement. Flights with affected pumps are prohibited after December 31, 2008. Spare pumps must be inspected before installation and returned for repair if non-compliant, following the instructions in Eurocopter AS332 Alert Service Bulletin No. 01.00.73.
AI-generated summary from official EASA source document. Always verify against the original.