# Presentation: 694255

## Use of DERRepair / Alterations & STC

- Mike Heusser,  ACE-115N
-    Peter Pupator, ACE-115N
-      Mark Wilson, AAL-235

## Training Objective

- Familiarize the A&P and I/A community with the use of DERs.
- Discuss the common pitfalls of DER usage.

## Designated Engineering Representative (DER)

- If the applicant employs an appropriately authorized DER to provide supporting data the IA should coordinate activities with both the applicant and the DER.
- If the data addresses the entire alteration or repair, and all of the requirements of part 21/23/25/27/29 and 43 are met, there is no requirement for further approval by the ASI.
- FAA Order 8110.37, Designated Engineering Representative Guidance Handbook
**FAA Order 8110.45**, Use of data approved by DER to Support Major Alterations
- AC 183.29-1, DER Directory
- Or contact DER Appointing ACO.

## TYPES OF DESIGNATIONS

- Structural
- Powerplant
- Systems & Equipment
- electrical
- mechanical
- Radio
- Engine
- Propeller
- Flight Analyst
- Flight Test Pilot
- Acoustical

- Special (or Limited) Delegations or Authorizations:
- Administrative or Management
**Major Repair & Alteration**
- PMA Identicality
- Special Authorization

## DER AUTHORIZATION

- DERs are;
- authorized to approve data.
- not authorized to approve an installation on an aircraft or return an aircraft to service.
- DER approval indicates that the data complies with the applicable certification regulations, within the DER’s limitations.

## DER INFORMATION, cont.

- Anchorage ACO maintains a document listing DERs from outside Alaska who would like to do work in Alaska, including their contact information and delegated functions and authority
- See handout.
- Special Alteration Authority DERs (being developed)
- Based on experience and not education.
- Of a limited type and scope.
- Alteration Checklists (being developed)
- Presented as Training aids and subject to change.
- Requires YOUR input on specific alterations.
- AC 23-XX will be published in Federal Register.(goal-12/2003)
- Eventually turned into National guidance material.

## USE OF DERs FOR MAJOR REPAIR OR ALTERATION

- To approve data related to major repairs or alterations, the DER _must_ have a special delegation from the ACO.
- Ask to see their appointment letter, which will state that they have the authority to approve data in support of major repairs, major alterations, or both.
- A DER may be authorized one-time authority to approve data in support of a major repair or alteration, from his/her appointing ACO.  Must be noted on FAA Form 8110-3.

## SAMPLE FAA FORM 8110-3(issues to be aware of)

- Date and Make of Aircraft
- Name of Applicant
- Identification of Data
- Title
- Limitations of data
- Quote Registration No. (N ####) AND Serial No. for possible changes to Reg. No. in future.

## SAMPLE FAA FORM 8110-3

## OTHER WAYS A DER CAN HELP

- Determinations of whether a modification requires an STC rather than field approval
- Putting together a compliance checklist, PSCP.
- Assist with design through his/her experience of details that make a design compliant or non-compliant
- Determining the appropriate regulations
- Witness tests
- Develop data system.

## Type of Data Required:

- Drawing Sketches or Photos
- Reports, Analysis
- Test Plans / Reports
- Compliance Checklists
- Flight Manual Supplements
- Specification for materials or processes
- Maintenance Manuals (ICA)
- Parts Catalogs (IPC)

## WHERE TO GO FOR HELP

- Flight Standards Office
- Aircraft Certification OfficeAnchorage ACO: 271-2668
- Designated Engineering Representatives
- Original Equipment Manufacturer
- Aircraft Organizations (type clubs, other owners/mechanics, etc.)

## ONLINE RESOURCES

- MIL / AN / MS Specification:
- _[http://assist.daps.dla.mil/online/start/](http://assist.daps.dla.mil/online/start/)_ (goto quick search)
- CAM - CAR documents
- http://dotlibrary.specialcollection.net/
- DER DIRECTORY is maintained on the Internet
- http://av-info.faa.gov/dst/DERDirectory.pdf
- Aviation Regulation Home Page:
- _[http://av-info.faa.gov/](http://av-info.faa.gov/)_
- (TSO, STC listings, TCDS aircraft info, regulator guidance)

## USE OF DATA APPROVED BY DERs TO SUPPORT MAJOR ALTERATIONS

- The person performing the alteration is responsible for certifying that the alteration was accomplished in accordance with 14 CFR.
- The DERs approving data for alterations must have special authority for major alterations.
- If you don’t have  all of the data required for showing compliance with all applicable regulations.  A field approval or STC will be required.

## USE OF DATA APPROVED BY DERs TO SUPPORT MAJOR ALTERATIONS

**If the alteration requires any of the following, you will most likely require a field approval or STC**
- Flight Manual Supplement
- Changes to airworthiness limitations
- Ground and Flight tests plans
- Ground and Flight tests
- Compliance inspections
- Modifications to critical structure or life limited parts
- Instructions for continued airworthiness
- Special conditions
- Equivalent level pf safety findings