- Proposed Airworthiness Directive to Mandate Inspection or Retirement of Control Cable Assemblies with Terminals Manufactured from SAE-AISI 303 Se Stainless Steel
This Notice of Proposed Rule Making (NPRM) is issued by the Civil Aviation Safety Authority (CASA) with a view to ensuring that Australian aviation safety requirements are current and appropriately address safety risks.
CASA's policies require that the aviation safety regulations must:
- be necessary to address known or likely safety risks
- provide for the most efficient allocation of Industry and CASA resources
- be clear and concise
- where appropriate, be aligned with international standards and drafted in outcome-based terms.
CASA has received a number of Service Difficulty Reports (SDRs) from aircraft operators relating to failure of control cable terminal fittings. The failed terminals had been in service for approximately 15 years or more, were manufactured from SAE-AISI 303 Se stainless steel and identified by standard terminal fitting part numbers AN669, MS21260 or MS20668.
Research has shown that SAE-AISI 303 Se stainless steel is susceptible to stress corrosion cracking and may cause control cable terminal failure if allowed to propagate undetected. The objective of this NPRM is to propose an AD that would seek to mitigate the unsafe condition caused by stress corrosion cracking in control cable terminals manufactured from SAE-AISI 303 Se stainless steel.
This proposed AD addresses a safety of flight issue that may arise if these control cable terminals are not routinely inspected when the total time in service exceeds 15 years. The inspection or retirement requirement will apply to any assemblies with control cable terminals manufactured from SAE-AISI 303 Se stainless steel, including, but not limited to, those terminals that use standard part numbers AN669, MS21260 and MS20668. This proposed AD would affect all Australian aircraft other than those maintained under the Maintenance Steering Group (MSG)-3 philosophy.
How to respond
Comment period now closed.
Contact: Thomas Wiltshire, Project Leader