Today's Message Index:
----------------------
1. 07:56 AM - Re: Returning to Phase 1? (Kelly McMullen)
2. 11:33 AM - Elevator Pitch Servo Failure (Jim Combs)
3. 04:13 PM - Re: Elevator Pitch Servo Failure (bill.peyton)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Returning to Phase 1? |
I had occasion to talk to my FAAST maintenance coordinator yesterday,
and he confirmed that the Part 43 Appendix A is the determining guidance
as to major, minor modifications. Also, that FSDO needs to be notified
of the modification, and will determine how many hours of Phase I flight
test is needed. One wrinkle that I need to check out, is where the
modification is major, but is offered as an option by the kit
manufacturer. On certificated aircraft, optional equipment that would
otherwise be major, if offered as an option, is approved and can be
installed by log book entry. For instance, say Mooney offered a plane
with a McCauley prop one year, and a Hartzell the next year without
changing the engine model number, then you could change from one to the
other with log book entry. I'm thinking of something like you built the
plane with say a Garmin autopilot with just a roll servo, then later
decided to add a pitch servo, or had those two and decided to add a yaw
damper. Vans came out with that option after we got our kits. Perhaps
that may or may not need additional Phase I flight test. I'm going to
check tomorrow.
Kelly
On 4/12/2019 7:40 PM, Phillip Perry wrote:
>
> Good insight.
>
> Might be worth a phone call to the FSDO to see if this is something that can
be done via email rather than making the trip up in person. (Almost 2hrs away)
>
> Thanks for the congrats. A little clarification, Im sitting on the Chapter
Advisory Council rather than homebuilt council. Id always be willing to chat
with you folks on ideas and issues that I might be able to bring back to the
chapters office at OSH. Im not an EAA employee, but do have the ear of a few
folks in the chapters office and Im happy to help chapters do their thing.
>
> Phil
>
>
>
>
>
>> On Apr 12, 2019, at 9:27 PM, Kelly McMullen <kellym@aviating.com> wrote:
>>
>>
>> Now that you are involved with the Homebuilt Council, (congratulations), I'm
sure Vic Syracuse can give you a better explanation than I can. Ditto Mel Asberry.
>> Lets start with maintenance and modification. Examine the operating limitations
for the aircraft in question. They will say what has to be done for a major
modification. Typically, notify the FSDO and if the plane is in same area as
original phase I, do 5 hours test flying. If plane is now in different FSDO
area, request new test area.
>> As for doing the work...there is no license needed, not repairman nor A&P. The
only time a license is needed is for performing the condition inspection. As
for logbook, enter description of work done, state a Phase I test period was
done and completed. When the the FSDO is notified, they may assign a different
test period or may want to modify the test area. There is no entry for placing
a plane in Phase I, only an entry for completion of Phase I.
>> You don't state the type of modification...you use the guidance in Part 43,
Appendix A for making the determination of whether it is major. Prop model change
or engine change definitely is. Adding a Yaw damper to an RV may or may not
be. It will take a few hours of calibration flights anyway. One can consult
with the FSDO if in doubt.
>>
>>> On 4/12/2019 4:55 PM, Phillip Perry wrote:
>>> I am helping a friend do some work on his airplane and we are considering making
some modifications that could put the airplane back in Phase 1 for another
5 hour test spin.
>>> He purchased the flying RV, so he is not the builder of the aircraft and does
not have the repairman certificate.
>>> In this scenario, what is the process of putting the airplane back in Phase
1 testing? As the owner who is not the builder, can he create the logbook entry
resubmitting it into Phase 1 and then take it back out? Or could that be
done by and A&P/IA? Or does that require a visit to the FSDO?
>>> Im unclear how the process works if youre not the builder with a repairman
certificate.
>>> Thanks,
>>> Phil
>>
>>
>>
>
>
>
>
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Elevator Pitch Servo Failure |
Had an elevator pitch servo fail on a flight yesterday. The cable
pulled out of a hole that uses a set screw to hold the cable in place.
It's a TruTrak pitch servo. It uses a cable that wraps around a drum.
Each end of the cable is attached to an aluminum channel.
1200 hours on the airplane with no prior issues. The pilot said the
elevator felt funny on any up travel past neutral. He also heard a
clicking noise as it passed the neutral point.
An engineering EC would be to leave the cable slightly long and crimp
a sleeve onto the cable as a a failsafe for the set screw(s).
I will call TruTrak tomorrow to see if this should be replaced or
repaired. I will be adding this to my inspection checklist. I
noticed nothing during the last condition inspection.
Not sure exactly when it failed. It was noticed prior to a return
flight from another airport. Removal of the bulkhead and removing the
control arm of the servo from the elevator bellcrank was done to allow
the flight home.
N312F - 1200 hours
Jim Combs
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Elevator Pitch Servo Failure |
Hi Jim,
I was always concerned with this design of the pitch servo. I spoke with TT about
it 8 years ago and they assured me they had redesigned the force multiplier
to remedy this issue. Yours is not the first time this has happened. Just
consider yourself extremely fortunate that the arm did not jam the entire elevator
operation.
I designed a fail-safe retainer to prevent this from happening should the cable
come loose. I also shared this with TT. Here are a few photos of my modification.
--------
Bill
WA0SYV
Aviation Partners, LLC
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=488739#488739
Attachments:
http://forums.matronics.com//files/img_1940_270.jpg
http://forums.matronics.com//files/img_1939_314.jpg
http://forums.matronics.com//files/img_1937_412.jpg
http://forums.matronics.com//files/img_1936_183.jpg
http://forums.matronics.com//files/img_1935_180.jpg
http://forums.matronics.com//files/img_1933_207.jpg
http://forums.matronics.com//files/img_1934_160.jpg
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|