E-LSA with new prop: Re-enter Phase 1?

[JimParker256]

Probably one for Dr Paul, but feel free to chime in if you know the answer. Let's assume an Experimental LSA is equipped with a Warp Drive composite ground-adjustable prop, and that prop is replaced with a Sensenich composite ground-adjustable prop. Does this constitute a "major change" that would require that the aircraft be placed back into Phase 1 flight testing, and if so, for how many hours?
Thanks.

[drseti]

That's a good question, Jim, for which I don't have a clue. That's one for a DAR, and I only happen to be a CFI and DPE. But, I know somebody I can ask Monday, if nobody else chimes in before then.

[3Dreaming]

This has been a discussion on an other forum I follow. My opinion is that yes it constitutes a major change, but we can dig a little deeper. Is the diameter or weight of the propellers different? If the answer is yes, then I say it is a major change. If they are the same then it could be considered minor, but others within the FAA might not agree. The most conservative action would be to put it back into phase one testing.

As an aside I once did considerable propeller testing on a model airplane. I tried probably 15 different propellers on one airframe engine combo. I was amazed that way different propellers made the airplane fly beyond speed and acceleration. They effected the airplane in roll and yaw. It was so bad that if someone flew the airplane with the wrong prop they would say it flew like crap, but with the right prop it flew nice.

[David]

I believe you do go back in Phase ! and then document it - a quick search on the VAF forum see below:

Quote from VAF:
Originally Posted by Saville View Post
Getting a new prop installed on the -8.
I think I read somewhere that this puts the plane back into a partial phase 1 - true?
Do you need an FSDO signoff for this?
Thanks
If it is a different diameter and/or pitch, a change of construction, wood/composite/metal, or any other change that will affect flight characteristics you will need to return to phase I for at least 5 hrs. If you are changing F/P to or from a controllable pitch, then you need to submit new 8130-6.
__________________
Mel Asberry, DAR since the last century. Over 1,000 certifications accomplished. Discount for Veterans, Law Enforcement, Fire Fighters.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)

When I change my Sensenich a few years ago since was a different blade width I voluntarily when back in to Phase ! For 5 hours.
<rvmel(at)icloud.com>

[3Dreaming]

Also the time duration may be less for a ELSA compared to a EAB LSA.

[JimParker256]

I suppose the conservative course of action would be to contact the FSDO and confirm it.

[3Dreaming]

I suppose the conservative course of action would be to contact the FSDO and confirm it.

There is a good chance they won't know. It all boils down to what your operating limitations say.

If you do go back into phase one flight testing you will likely need to change the geographical location of the flight test area.

[JimParker256]

Just wanted to close the loop on this... I spoke to Mel Asbury (he's an EAA member in my old chapter as well as being a DAR), and he confirmed that changing a prop (other than "like for like") is a major change, and requires the airplane to be put back into Phase 1 test flight program for at least 5 hours, or whatever is specified in the aircraft's Operating Limits. My operating limits state the following:

"The geographically responsible FSDO where the aircraft is based must be notified, and its response received in writing, before flying this aircraft after incorporation of a major change as defined by § 21.93. The FSDO may require demonstrated compliance with § 91.319(b)."

The referenced § 21.93 is the "major / minor change" section, and § 91.319(b) says you have to stay within the designated test flight area until you've shown that the aircraft is controllable thought out it's normal range of speeds and throughout all the maneuvers to be executed, and that it has no hazardous operating characteristics or design features. I believe the FSDO will determine the length of the new Phase 1 test flight period (if any), and communicate that to me in writing.

Thanks for the suggestions and ideas.

[ShawnM]

I was told by a local DAR and confirmed with my local FSDO that If the manufacturer of this LSA also sells the plane with the Sensenich prop then you would not have to go back to Phase 1 testing because it's already been done by the manufacturer.

My SportCruiser has been sold by the manufacturer with a Woodcomp prop and a Sensenich prop, both ground adjustable, and when you swap one for the other you just make a logbook entry. This may not apply to your LSA.

[JimParker256]

I sent an email to the FSDO to get their take. Over a week now, with no response. Par for the course.