Inspection of Main Rotor Blade Retention Bolts
- Published
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What to do
Owners and operators of MD900 helicopters equipped with main rotor blade retention bolts P/N 900R3100001-105 should follow the inspection and repetitive gap check procedures outlined in MDHI Service Bulletin SB900-116R1 dated 9 April 2010. They should also remain aware of the life limits and inspection requirements for the older -103 bolts as mandated by EASA Airworthiness Directive 2010-0050 Revision 1. For further technical assistance, stakeholders may contact MD Helicopters Customer Support or EASA's Airworthiness Directives section.
Summary
EASA Safety Information Bulletin 2009-18R1 is an advisory document addressing the inspection of main rotor blade retention bolts on MD Helicopters MD900 models fitted with part number 900R3100001-105 bolts. It provides updated guidance following previous inspections related to bolts with part number 900R3100001-103 and references MD Helicopters Service Bulletin SB900-116R1 dated 9 April 2010. The bulletin aims to enhance safety by recommending repetitive gap checks and inspections of these critical components.
What changed
This revision updates the original bulletin by including the newer main rotor blade retention bolts P/N 900R3100001-105 alongside the previously addressed -103 bolts. It incorporates the requirements from EASA Airworthiness Directive 2010-0050 Revision 1, which mandates inspections and life limits for the -103 bolts, and adds the recommendation to perform repetitive gap checks as detailed in MDHI Service Bulletin SB900-116R1.
Why it matters
The bulletin is important for operators and maintenance organizations of MD900 helicopters because it highlights potential safety risks associated with main rotor blade retention bolts. Proper inspection and maintenance of these bolts are critical to ensuring the structural integrity of the main rotor system, thereby preventing possible in-flight failures. Compliance with these recommendations supports continued airworthiness and operational safety.
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