Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Required certification level on aircraft reconfiguration.

Required certification level on aircraft reconfiguration.

Required certification level on aircraft reconfiguration.


I am a cabin engineer working at airline.
I am writing this post to make sure what certification is required for aircraft reconfiguration.
Our company usually get a STC for cabin reconfiguration in previous modification programs.
But I heard that some airlines or aircraft leasing companies get only FAA 8110-3 for cabin reconfiguration.
I am wondering why this difference is made.
To the best of my knowledge, STC is required if there are major changes on aircraft during reconfiguration but FAA 8110-3 is only required if there is only minor changes.
I would like to know if my understanding is correct.
In addion, I would like to know what the major diffrence between STC and 8110-3.
I think STC have some more steps than 8110-3 but please let me know if anyone could make comparision between STC and 8110-3.

Thank you.

RE: Required certification level on aircraft reconfiguration.


Cabin outfitting and subsequent modifications are not required to be STC’d (or part of the TC). They may be done by engineering approval - DER 8110-3 or ACO approval.

The history is that a decade or so ago, FAA Aircraft Certification and Flight Standards got together to decide what should be STC’d, what could be done by engineering approval, and what could be Field Approved. For a while, the document did say “all cabins must be STC’d” but the FAA later came back and decided that was not their intent, and revised the document to how it reads today. It is called the “Major Repair and Alteration Data Approval Online Job Aid” and can be found at:


Look for items I.1 and I.2 under Transport Category airplanes.

Lessors may have STC’s as a requirement of a lease agreement, that is contractual.

An 8110-3 is not appropriate for Minor Alterations, see Order 8110.37E section 4-12.b.

As far as differences between STC’s and DER 8110-3’s, here are some compare & contrast points:
- No application for an 8110-3. If there are Field approved aspects, some FSDO’s do require an application and a few even make it harder than an STC.
- No Certification Plan required for an 8110-3, though proper project planning should still be there.
- No Conformity Inspection Plan or Conformity Inspections required for an 8110-3, though components may need PMA or TSO approval.
- A similarity is that data (both descriptive design data and compliance data) is needed. DER’s can only approve data, which leads into....
- Another similarity is that a Compliance Inspection of the cabin may be necessary. This is not to be confused with Conformity Inspections. When is a Compliance Inspection necessary? That’s a topic for another post. Some examples are repetitive rows and installations mirrored left/right, assuming the data is good enough and the original configuration data complied.
- STC’s may be advantageous if there is testing involved.
- Aircraft support documents can end up being close to the same, AFMS, ICA, etc.

Hopefully this gets you further along. There’s a wide range of experiences out there and others will be sure to offer theirs.

RE: Required certification level on aircraft reconfiguration.

Thanks for that link


RE: Required certification level on aircraft reconfiguration.

To add to this a little, use AC 43-210A as a guide. As a Function Code 51 DAR, I'm required to use the AC for all Field Approvals. As a DER with repair and alteration authority limited to what can be Field Approved, I find the AC very helpful in organizing what is required for a given alteration.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close