Beware the Hidden Dangers of Layering STCs
Cessna 337 Super Skymaster · Other Documents
Overview
This document, produced by the FAA Safety Promotion Program Office, addresses the risks associated with layering Supplemental Type Certificates (STCs) on aircraft, specifically highlighting incidents involving the Cessna 337. It emphasizes the importance of ensuring that any modifications made to the aircraft are compatible with existing alterations to maintain airworthiness. The document serves as a resource for aircraft owners, operators, and maintenance personnel to understand the implications of STC modifications and the necessary precautions to take. It includes safety recommendations from the NTSB and guidance on documenting weight and balance changes in aircraft records.
- Cessna 337 incidents highlight the risks of layering STCs.
- Weight and balance changes must be documented in the aircraft record.
- Modifications must be compatible with previous alterations to maintain airworthiness.
- NTSB recommends educating, evaluating, and documenting modifications.
- FAA guidance stresses the importance of installer responsibilities regarding STC compatibility.
Document
Source
Originally published by www.faasafety.gov. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Other Documents
- Year
- 2019
- Pages
- 17
- File size
- 2.3 MB
- Publisher
- www.faasafety.gov
Common. Rarer than 24% of the aircraft models we track.
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- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins
- Type Certificate (TCDS)
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In this document
Introduction
The document introduces the concept of layering STCs and the potential safety risks involved. It highlights the importance of understanding how modifications can affect aircraft performance and safety.
Incident Analysis
Several incidents involving the Cessna 337 are analyzed, including a notable case where the outboard section of the left wing separated during flight, resulting in fatalities. This section underscores the critical need for thorough evaluation of modifications.
NTSB Recommendations
The document outlines three key safety recommendations from the NTSB aimed at educating aircraft owners and operators, evaluating modifications, and documenting changes appropriately to ensure compliance with airworthiness standards.
FAA Guidance
Guidance is provided on how to determine the compatibility of changes to type design installed on aircraft. This includes responsibilities for installers and the importance of maintaining records of weight and balance changes.
Conclusion
The document concludes with a call to action for aircraft owners and maintenance personnel to remain vigilant about the implications of STC modifications and to seek further information and guidance as needed.
Safety notes
- Ensure all alterations are compatible with previous modifications to maintain airworthiness.
Full document text
Presented to: By: Date: Federal Aviation Administration Produced by: The FAA Safety Promotion Program Office Beware the Hidden Dangers of Layering STCs AW Topic of the quarter Qtr. 2FY2019 The National FAA Safety Team Presents Frankenplane! AMTs in CO and WY FAA Safety Team March 2019 Federal Aviation Administration 2 2 People always seem to have a better idea 2 Federal Aviation Administration Special Mission…or not 3 Federal Aviation Administration Beech Baron N28MR 2 Fatalities 4 Federal Aviation Administration Beech Baron N28MR 2 Fatalities 5 Federal Aviation Administration 6 Cessna 337 N12NA 5 Fatalities Federal Aviation Administration 7 Cessna 337 N12NA 5 Fatalities Federal Aviation Administration 8 Cessna 337 N12NA 5 Fatalities Outboard Section of the Left Wing Separated and found on the Runway Federal Aviation Administration Three NTSB Safety Recommendations Issued by the Board on May 24, 2012 Educate Evaluate Document 9 3 NTSB Safety Recommendations Federal Aviation Administration 10 AC 20-188 Compatibility of Changes to Type Design Installed on Aircraft 1. List of Installations that Might be Incompatible 2. Guidance for the Owner/Operator 3. Installer Responsibilities 4. How to Resolve Non- compatible Modifications Federal Aviation Administration Transport Canada • Transport Canada Airworthiness Notices - B045, Edition 1 - 15 May 1998, 11 Federal Aviation Administration 12 Other Documents • Anchorage ACO flyer, How Do I Determine Supplemental Type Certificate (STC) Compatibility? • Aircraft Owners and Pilots Association (AOPA) article “Layering STCs: Understanding and Managing the Risks. November 21, 2013 • FAA Safety Briefing - May/June 2014 article Beware the Frankenplane! The Hidden Dangers of Layering STCs. Federal Aviation Administration 13 FAA Order 8110.4 For multiple STCs, include the following note: “The installer must determine whether this design change is compatible with previously approved modifications.” Federal Aviation Administration 14 FAA Form 337 NOTICE Weight and balance or operating limitation changes shall be entered in the appropriate aircraft record. An alteration must be compatible with all previous alterations to assure continued conformity with the applicable airworthiness requirements. Federal Aviation Administration 15 What Can You Do? • The AC is meant to be a starting point to create awareness – Expected to evolve over time. – Add cases/information as available • Submit feedback form in AC if you have a recommendation. Federal Aviation Administration 16 Who you gonna call? Federal Aviation Administration Questions? Program Manager: Gina Moretto Gina.Moretto@faa.gov, 303-342-1104 Alteration Questions: Please contact your Principal Maintenance Inspector Presentation Questions: Edward Garino, AIR-111, 404-474-5532 Edward.garino@faa.gov 17