Sorry to dredge up an old thread but we would like to find a way to eliminate the need to remove our Pawnee wings every 6 years as required with the Schweizer STC SA01073AT. We use our Pawnees a lot less these days and mainly use a lightweight Eurofox
tow-plane which burns 1/4 of the gas, so even changing to an hour based rather than calendar check would be helpful.

Being based in Scotland I have no idea how to go about tackling the FAA for an AMOC to the STC ongoing airworthiness requirement for the 6 year wing removal. Can anyone help ?

Thanks,

Mark Recht
Deeside Gliding Club
ABOYNE
Scotland


On Monday, 4 February 2019 at 12:15:34 UTC, [email protected] wrote:

On Saturday, February 2, 2019 at 11:58:58 AM UTC-5, [email protected] wrote:

W dniu środa, 4 maja 2011 05:14:31 UTC+2 użytkownik Bill T napisał:

On May 3, 6:05 pm, T <[email protected]> wrote:

On May 2, 7:40 am, Greg Arnold <[email protected]> wrote:

The local towplane operation has a Pawnee that back in 1996 had an STC
from STC Inc. (SA01154AT) modification to the wing attach cluster. Apparently it still requires a wings off inspection every two years. The owner of the operation has heard that there may be an inexpensive
permanent fix that eliminates the biennial inspection. Perhaps a gusset
plate welded onto the cluster. Is anyone familiar with that procedure?

Our wing attach cluster STC repair came from Schweizer and requires annual inspections, but only the wing removal and dye check ever 6 years. It's not that hard to remove Pawnee wings if you have a hanger and an engine hoist.

You can research STCs on FAA.gov.

http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgSAIB.nsf/2d69931bd1dab16b862572250070589f/c1850358cba7bf4a8625721f0052ec5c/$FILE/ACE-96-10.pdf

There are only 3 STCs I could find that are approved for the Wing Cluster AD.
SA00992AT, Kosola Assoc, Georgia
SA01073AT, Schweizer Aircraft (the one we have mentioned above) SA01154AT, STC Inc, (the one you say you have)

And I would think that once one of the STCs is installed, it would be very difficult to change to a different one because of all the welding that is done on original installation.

Hi guys,
I am trying to find the STC SA01073AT details. According to our aircraft's documentation, we have it installed. Is there any special procedure to perform a dye penetrant check every 6 years (drawings, instructions)? I suppose it may be included in

STC, but I cannot find anything on the internet...

I have lots of documentation on all three STC's that were available for the wing spar attachment. I also have a letter from the FAA stating that two of the three are considered termination for the AD. Those two are the STC Solutions, SA01154AT, and the

Kosala, SA00992AT. You may also apply for an AMOC for the Schweizer STC and possibly eliminate the wing removal inspection. I do have a ccopy of the FAA letter and would be glad to pass it along. Bob

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Mark, normally STCs provide terminating action for an AD as previously mentioned. But to keep that STC in effect you must comply with any requirements such as repetitive inspections outlined in the STC.

Applying for an AMOC to negate the inspections required under the STC may require some engineering data, or historical reference data and work with the STC holder. For an example, how many aircraft with the STC have had issues discovered with the 6yr
inspection out of how many aircraft have the STC?

STC was designed when PA-25s in the US were still being used in aerial application. Many are no longer used for that. This is why a Global AMOC was issued for AD 07-08-07 on the horizontal stab, but can only be applied to aircraft not used in aerial
application, but it did not negate the need to pull the horizontals and inspect the area every year.

BillT

On Wednesday, January 18, 2023 at 3:57:17 AM UTC-5, [email protected] wrote:

Sorry to dredge up an old thread but we would like to find a way to eliminate the need to remove our Pawnee wings every 6 years as required with the Schweizer STC SA01073AT. We use our Pawnees a lot less these days and mainly use a lightweight Eurofox

tow-plane which burns 1/4 of the gas, so even changing to an hour based rather than calendar check would be helpful.

Being based in Scotland I have no idea how to go about tackling the FAA for an AMOC to the STC ongoing airworthiness requirement for the 6 year wing removal. Can anyone help ?

Thanks,

Mark Recht
Deeside Gliding Club
ABOYNE
Scotland
On Monday, 4 February 2019 at 12:15:34 UTC, [email protected] wrote:

On Saturday, February 2, 2019 at 11:58:58 AM UTC-5, [email protected] wrote:

W dniu środa, 4 maja 2011 05:14:31 UTC+2 użytkownik Bill T napisał:

On May 3, 6:05 pm, T <[email protected]> wrote:

On May 2, 7:40 am, Greg Arnold <[email protected]> wrote:

The local towplane operation has a Pawnee that back in 1996 had an STC
from STC Inc. (SA01154AT) modification to the wing attach cluster. Apparently it still requires a wings off inspection every two years.
The owner of the operation has heard that there may be an inexpensive
permanent fix that eliminates the biennial inspection. Perhaps a gusset
plate welded onto the cluster. Is anyone familiar with that procedure?

Our wing attach cluster STC repair came from Schweizer and requires annual inspections, but only the wing removal and dye check ever 6 years. It's not that hard to remove Pawnee wings if you have a hanger
and an engine hoist.

You can research STCs on FAA.gov.

http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgSAIB.nsf/2d69931bd1dab16b862572250070589f/c1850358cba7bf4a8625721f0052ec5c/$FILE/ACE-96-10.pdf

There are only 3 STCs I could find that are approved for the Wing Cluster AD.
SA00992AT, Kosola Assoc, Georgia
SA01073AT, Schweizer Aircraft (the one we have mentioned above) SA01154AT, STC Inc, (the one you say you have)

And I would think that once one of the STCs is installed, it would be very difficult to change to a different one because of all the welding that is done on original installation.

Hi guys,
I am trying to find the STC SA01073AT details. According to our aircraft's documentation, we have it installed. Is there any special procedure to perform a dye penetrant check every 6 years (drawings, instructions)? I suppose it may be included in

STC, but I cannot find anything on the internet...

I have lots of documentation on all three STC's that were available for the wing spar attachment. I also have a letter from the FAA stating that two of the three are considered termination for the AD. Those two are the STC Solutions, SA01154AT, and

the Kosala, SA00992AT. You may also apply for an AMOC for the Schweizer STC and possibly eliminate the wing removal inspection. I do have a ccopy of the FAA letter and would be glad to pass it along. Bob

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Thanks Bill - unfortunately I discovered that the STC was not taken over by K & L Soaring as part of the deal to support Schweitzer gliders and so is still owned by Lockheed who probably have no idea that they have it or interest in it !

I’m sure there have been no issues with modified aircraft as the mod must be 100 times stronger then the original design, but there’s probably no way round the 6 yearly wing removal :-(

Mark

On Thursday, 19 January 2023 at 20:40:34 UTC, [email protected] wrote:

Mark, normally STCs provide terminating action for an AD as previously mentioned. But to keep that STC in effect you must comply with any requirements such as repetitive inspections outlined in the STC.

Applying for an AMOC to negate the inspections required under the STC may require some engineering data, or historical reference data and work with the STC holder. For an example, how many aircraft with the STC have had issues discovered with the 6yr

inspection out of how many aircraft have the STC?

STC was designed when PA-25s in the US were still being used in aerial application. Many are no longer used for that. This is why a Global AMOC was issued for AD 07-08-07 on the horizontal stab, but can only be applied to aircraft not used in aerial

application, but it did not negate the need to pull the horizontals and inspect the area every year.

BillT
On Wednesday, January 18, 2023 at 3:57:17 AM UTC-5, [email protected] wrote:

Sorry to dredge up an old thread but we would like to find a way to eliminate the need to remove our Pawnee wings every 6 years as required with the Schweizer STC SA01073AT. We use our Pawnees a lot less these days and mainly use a lightweight

Eurofox tow-plane which burns 1/4 of the gas, so even changing to an hour based rather than calendar check would be helpful.

Being based in Scotland I have no idea how to go about tackling the FAA for an AMOC to the STC ongoing airworthiness requirement for the 6 year wing removal. Can anyone help ?

Thanks,

Mark Recht
Deeside Gliding Club
ABOYNE
Scotland
On Monday, 4 February 2019 at 12:15:34 UTC, [email protected] wrote:

On Saturday, February 2, 2019 at 11:58:58 AM UTC-5, [email protected] wrote:

W dniu środa, 4 maja 2011 05:14:31 UTC+2 użytkownik Bill T napisał:

On May 3, 6:05 pm, T <[email protected]> wrote:

On May 2, 7:40 am, Greg Arnold <[email protected]> wrote:

The local towplane operation has a Pawnee that back in 1996 had an STC
from STC Inc. (SA01154AT) modification to the wing attach cluster.
Apparently it still requires a wings off inspection every two years.
The owner of the operation has heard that there may be an inexpensive
permanent fix that eliminates the biennial inspection. Perhaps a gusset
plate welded onto the cluster. Is anyone familiar with that procedure?

Our wing attach cluster STC repair came from Schweizer and requires
annual inspections, but only the wing removal and dye check ever 6 years. It's not that hard to remove Pawnee wings if you have a hanger
and an engine hoist.

You can research STCs on FAA.gov.

http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgSAIB.nsf/2d69931bd1dab16b862572250070589f/c1850358cba7bf4a8625721f0052ec5c/$FILE/ACE-96-10.pdf

There are only 3 STCs I could find that are approved for the Wing Cluster AD.
SA00992AT, Kosola Assoc, Georgia
SA01073AT, Schweizer Aircraft (the one we have mentioned above) SA01154AT, STC Inc, (the one you say you have)

And I would think that once one of the STCs is installed, it would be
very difficult to change to a different one because of all the welding
that is done on original installation.

Hi guys,
I am trying to find the STC SA01073AT details. According to our aircraft's documentation, we have it installed. Is there any special procedure to perform a dye penetrant check every 6 years (drawings, instructions)? I suppose it may be included

in STC, but I cannot find anything on the internet...

I have lots of documentation on all three STC's that were available for the wing spar attachment. I also have a letter from the FAA stating that two of the three are considered termination for the AD. Those two are the STC Solutions, SA01154AT, and

the Kosala, SA00992AT. You may also apply for an AMOC for the Schweizer STC and possibly eliminate the wing removal inspection. I do have a ccopy of the FAA letter and would be glad to pass it along. Bob

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Thursday, January 19, 2023 at 3:40:34 PM UTC-5, [email protected] wrote:

Mark, normally STCs provide terminating action for an AD as previously mentioned. But to keep that STC in effect you must comply with any requirements such as repetitive inspections outlined in the STC.

Applying for an AMOC to negate the inspections required under the STC may require some engineering data, or historical reference data and work with the STC holder. For an example, how many aircraft with the STC have had issues discovered with the 6yr

inspection out of how many aircraft have the STC?

STC was designed when PA-25s in the US were still being used in aerial application. Many are no longer used for that. This is why a Global AMOC was issued for AD 07-08-07 on the horizontal stab, but can only be applied to aircraft not used in aerial

application, but it did not negate the need to pull the horizontals and inspect the area every year.

BillT
On Wednesday, January 18, 2023 at 3:57:17 AM UTC-5, [email protected] wrote:

Sorry to dredge up an old thread but we would like to find a way to eliminate the need to remove our Pawnee wings every 6 years as required with the Schweizer STC SA01073AT. We use our Pawnees a lot less these days and mainly use a lightweight

Eurofox tow-plane which burns 1/4 of the gas, so even changing to an hour based rather than calendar check would be helpful.

Being based in Scotland I have no idea how to go about tackling the FAA for an AMOC to the STC ongoing airworthiness requirement for the 6 year wing removal. Can anyone help ?

Thanks,

Mark Recht
Deeside Gliding Club
ABOYNE
Scotland
On Monday, 4 February 2019 at 12:15:34 UTC, [email protected] wrote:

On Saturday, February 2, 2019 at 11:58:58 AM UTC-5, [email protected] wrote:

W dniu środa, 4 maja 2011 05:14:31 UTC+2 użytkownik Bill T napisał:

On May 3, 6:05 pm, T <[email protected]> wrote:

On May 2, 7:40 am, Greg Arnold <[email protected]> wrote:

The local towplane operation has a Pawnee that back in 1996 had an STC
from STC Inc. (SA01154AT) modification to the wing attach cluster.
Apparently it still requires a wings off inspection every two years.
The owner of the operation has heard that there may be an inexpensive
permanent fix that eliminates the biennial inspection. Perhaps a gusset
plate welded onto the cluster. Is anyone familiar with that procedure?

Our wing attach cluster STC repair came from Schweizer and requires
annual inspections, but only the wing removal and dye check ever 6 years. It's not that hard to remove Pawnee wings if you have a hanger
and an engine hoist.

You can research STCs on FAA.gov.

http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgSAIB.nsf/2d69931bd1dab16b862572250070589f/c1850358cba7bf4a8625721f0052ec5c/$FILE/ACE-96-10.pdf

There are only 3 STCs I could find that are approved for the Wing Cluster AD.
SA00992AT, Kosola Assoc, Georgia
SA01073AT, Schweizer Aircraft (the one we have mentioned above) SA01154AT, STC Inc, (the one you say you have)

And I would think that once one of the STCs is installed, it would be
very difficult to change to a different one because of all the welding
that is done on original installation.

Hi guys,
I am trying to find the STC SA01073AT details. According to our aircraft's documentation, we have it installed. Is there any special procedure to perform a dye penetrant check every 6 years (drawings, instructions)? I suppose it may be included

in STC, but I cannot find anything on the internet...

I have lots of documentation on all three STC's that were available for the wing spar attachment. I also have a letter from the FAA stating that two of the three are considered termination for the AD. Those two are the STC Solutions, SA01154AT, and

the Kosala, SA00992AT. You may also apply for an AMOC for the Schweizer STC and possibly eliminate the wing removal inspection. I do have a ccopy of the FAA letter and would be glad to pass it along. Bob
No, it will not negate pulling the stab! Pulling the stab is much better than the STC conversion. I can pull the stab in 30 minutes and inspect, I even use bore inspection tool to confirm that there is no damage. In past years the AMOC was held with the
owner of the aircraft, now it is a permanent document to be kept with the logbook.. OBTP

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)