Members-Only Resources Member Directory Newsletter Index w Online Forum Your Account Service Letters Suggestions and detailed information to assist with aircraft maintenance, safety and improvements s Airworthiness Directives Critical notifications to alert owners and pilots about potentially unsafe conditions and/or defect issues l 337 Index Required FAA form when owners perform major repairs on an aircraft Z Cessna 120/140 Supplemental Type Certificates Certifications of approval issued by the FAA for major modifications to an aircraft's original design Z Cessna 140A Supplemental Type Certificates Certifications of approval issued by the FAA for major modifications to an aircraft's original design i Other Documents Provided for reference and historical purposes (not intended to substitute official publications)
