DHC-8 Series 100/200/300 Nacelle Bolt Migration
- Published
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators and maintenance personnel should perform a General Visual Inspection of all four nacelle pins and retention washers at the first available maintenance opportunity, using inspection mirrors and flashlights as recommended. Any defects or malfunctions should be reported to Transport Canada in accordance with mandatory Service Difficulty Reporting requirements. Continued vigilance during routine maintenance checks is advised to prevent nacelle pin migration and associated damage.
Summary
Transport Canada Advisory AV-2009-02 is a Service Difficulty Advisory addressing nacelle bolt migration issues on De Havilland Canada DHC-8 Series 100, 200, and 300 aircraft. The advisory highlights problems with incorrectly installed oversized washers (P/N CSP192-96) that prevent nacelle pins from migrating, leading to significant structural damage including buckled nacelle skin panels and cracked components. The document also references similar past events and provides detailed findings on affected parts and maintenance concerns.
What changed
This advisory introduces awareness of nacelle bolt migration caused by improper installation of retention washers and nacelle pins, which can compromise the structural integrity of the nacelle-to-wing attachment. It emphasizes the importance of correct installation and inspection procedures, including the use of inspection mirrors and flashlights during maintenance. Bombardier Aerospace has also published related information in their In-Service Activities Report to support these findings.
Why it matters
The advisory is critical for aviation professionals because migration of nacelle pins can cause severe damage to aircraft structures, necessitating extensive repairs and part replacements. Operators and maintenance organizations must ensure proper installation to maintain airworthiness and prevent costly structural failures. Early detection through recommended inspections helps safeguard flight safety and reduces unscheduled maintenance downtime.
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