VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #1  
Old 06-14-2017, 12:51 PM
dspender dspender is offline
 
Join Date: May 2009
Location: Bay City, MI
Posts: 421
Default FAA's definition of Major Modification?

Does anyone know the email address at FAA I can ask what constitutes a major modification (I think it is FAR 21.23) on my 10? Ie painting.
__________________
Dennis
Reply With Quote
  #2  
Old 06-14-2017, 12:55 PM
dspender dspender is offline
 
Join Date: May 2009
Location: Bay City, MI
Posts: 421
Default

It is 21.93
__________________
Dennis
Reply With Quote
  #3  
Old 06-14-2017, 12:56 PM
Raymo's Avatar
Raymo Raymo is offline
 
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,189
Default

Paint is not a major modification but you should re-balance flight controls afterward.

Mike Busch recently did a webinar on this topic.
__________________
Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
Reply With Quote
  #4  
Old 06-15-2017, 06:16 AM
rleffler's Avatar
rleffler rleffler is offline
 
Join Date: Jun 2006
Location: Delaware, OH (KDLZ)
Posts: 4,196
Default

Quote:
Originally Posted by dspender View Post
Does anyone know the email address at FAA I can ask what constitutes a major modification (I think it is FAR 21.23) on my 10? Ie painting.
Your local FSDO should be able to answer any questions like this. There is a PDF on faa.gov that lists both telephone numbers and appropriate email accounts for each FSDO.

and no, painting is not a major modification. On a RV-10, that would be changing the prop or engine, or deciding that you want to use RV-7 wings instead.
__________________
Bob Leffler
N410BL - RV10 Flying
http://mykitlog.com/rleffler
Reply With Quote
  #5  
Old 06-15-2017, 07:57 AM
Snowflake's Avatar
Snowflake Snowflake is offline
 
Join Date: Oct 2009
Location: Victoria, BC, Canada
Posts: 3,932
Default

In Canada I believe the criteria is anything that affects aerodynamics or performance.

Change engine, change from fixed pitch to constant speed, etc.
__________________
Rob Prior
1996 RV-6 "Tweety" C-FRBP (formerly N196RV)
Reply With Quote
  #6  
Old 06-15-2017, 09:02 AM
DanH's Avatar
DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
Posts: 9,500
Default

Whatever your FSDO says it is. Seriously.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
Reply With Quote
  #7  
Old 06-15-2017, 09:50 AM
Weasel's Avatar
Weasel Weasel is offline
 
Join Date: Dec 2012
Location: Brooksville, MS
Posts: 745
Default

Quote:
Originally Posted by DanH View Post
Whatever your FSDO says it is. Seriously.
Amen! based on experience
__________________
Weasel
RV-4 715hr Sold
RV-10 "School Bus" - +1600hr counting
Fisher Classic Cassler Power VW sold
RV-10 N7631T 820hr Sold
RV-8 700+hrs
Carbon Cub 200 hr Sold
One-Off Super Cub 100 hr
SERFI AWARDS

http://weaselrv10.blogspot.com/
Reply With Quote
  #8  
Old 06-15-2017, 05:40 PM
KRviator's Avatar
KRviator KRviator is offline
 
Join Date: Oct 2009
Location: Sydney, Aust.
Posts: 820
Default

Quote:
Originally Posted by Weasel View Post
Amen! based on experience
Well, no, not really. What is acceptable to one FSDO may not be acceptable to another, which runs the risk of causing problems down the line and while trying to please the FAA or CAsA is always a good idea, education "sometimes" works too.

The actual rule is 14 CFR 21.93 (a) that says "In addition to changes in type design specified in paragraph (b) of this section, changes in type design are classified as minor and major. A “minor change” is one that has no appreciable effect on the weight, balance, structural strength, reliability, operational characteristics, or other characteristics affecting the airworthiness of the product. All other changes are “major changes” (except as provided in paragraph (b) of this section)."

From their own AC, if it is likely to have a significant effect on:
  • Weight
  • Balance
  • Structural Strength
  • Performance
  • Powerplant operation
  • Flight characteristics
  • Other qualities affecting airworthiness
Then it is deemed to be a major mod that requires data. They even have flowcharts to help you out with the process:



__________________
Once you have tasted flight you will forever walk the earth with your eyes turned skywards, for there you have been and there you will long to return - Leonardo DaVinci

My Flickr gallery: http://www.flickr.com/photos/35521362@N06/

RV-9A - Finished on 10th February 2016 after 4 years, 9 months and 19 days! The 1020th RV-9 flying.

First flight 26th March 2016. Essential specs 145KTAS @ 2400RPM, 8000', 24.2LPH, Initial RoC 1800FPM.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 01:47 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.