Hartiwg (Monarch) Fuel Caps on a Ragwing
Moderators: GAHorn, Karl Towle, Bruce Fenstermacher
Hartiwg (Monarch) Fuel Caps on a Ragwing
The following is from an email I received from association member Tom George. Tom was able to get a field approval for the Hartwig (formerly Monarch) fuel caps on his '48 ragwing. There are 10 photos, so this post is a bit lengthy.
==========================================
Doug
Sorry it took so long to get these pictures to you. This modification is really quite easy, and should be a big improvement over the original caps, and the new caps are also vented. Those old dished caps always hold water after a rain storm of foggy morning. Our old caps always leaked no matter what we did. The Hatwig cap adapter flange is raised slightly (about .090") in the center, which should alleviate water intrusion problems.
I worked with Butch Hartwig up in the Canandian office, but sent him some photos and now the US office may be aware of what's necessary for the modification. This was done on a one-time field approval.
Send me a note if you have any questions or call.
Tom George
1. Original cap and fabric termination flange. If nutplates are not installed, then installation will be required as seen here. Used floating plates MS21059-L08.
2. The tank adapter (Hartwig p/n FC0006) will need to be ordered undrilled as a blank. The cap is p/n FC002.
3. This is after trimming to fit the fabric termination flange. Requires approximately 1" to 1 1/2" to be removed in order to match the tank flange.
4. Unfortunately, the anti-siphon valve will have to removed.
The original tank inlet interferes with its operation. If you want to retain it, the tank will have to modified. This is never a favorite of the FAA.
5. After installation on the tank. A small band of PRC1422 was appplied to the flange from the edge of the mounting holes to about 1/4" inside of the raised portion of the cap adapter. You can see the bend in the adapter plate, which installs just outside of the seat for the original cap. The hole in the back of the filler neck is there to allow the vented cap to perform properly. It also allows you to see if at least see part of your sealant bead after installation. A tank pressure test is required after installtion. (Be careful not to overpressurize the tank, it will ruin your day.)
6. Tank installed.
7. Tank installed.
8. Tank installed.
9. Tank installed.
10. Fabric termination plate installed.
==========================================
Doug
Sorry it took so long to get these pictures to you. This modification is really quite easy, and should be a big improvement over the original caps, and the new caps are also vented. Those old dished caps always hold water after a rain storm of foggy morning. Our old caps always leaked no matter what we did. The Hatwig cap adapter flange is raised slightly (about .090") in the center, which should alleviate water intrusion problems.
I worked with Butch Hartwig up in the Canandian office, but sent him some photos and now the US office may be aware of what's necessary for the modification. This was done on a one-time field approval.
Send me a note if you have any questions or call.
Tom George
1. Original cap and fabric termination flange. If nutplates are not installed, then installation will be required as seen here. Used floating plates MS21059-L08.
2. The tank adapter (Hartwig p/n FC0006) will need to be ordered undrilled as a blank. The cap is p/n FC002.
3. This is after trimming to fit the fabric termination flange. Requires approximately 1" to 1 1/2" to be removed in order to match the tank flange.
4. Unfortunately, the anti-siphon valve will have to removed.
The original tank inlet interferes with its operation. If you want to retain it, the tank will have to modified. This is never a favorite of the FAA.
5. After installation on the tank. A small band of PRC1422 was appplied to the flange from the edge of the mounting holes to about 1/4" inside of the raised portion of the cap adapter. You can see the bend in the adapter plate, which installs just outside of the seat for the original cap. The hole in the back of the filler neck is there to allow the vented cap to perform properly. It also allows you to see if at least see part of your sealant bead after installation. A tank pressure test is required after installtion. (Be careful not to overpressurize the tank, it will ruin your day.)
6. Tank installed.
7. Tank installed.
8. Tank installed.
9. Tank installed.
10. Fabric termination plate installed.
Doug
Thanks guys, just wish there was more time to get things done a little faster -- Oh well!
This is a fairly easy modification and it wouldn't be all that hard to accomplish even if your aren't currently recovering your wings. It would only require a small circular patch, similar to a doily over the inspection hole ring -- the tanks don't have to be removed -- just a little less convenient and time on top of a ladder.
This is a fairly easy modification and it wouldn't be all that hard to accomplish even if your aren't currently recovering your wings. It would only require a small circular patch, similar to a doily over the inspection hole ring -- the tanks don't have to be removed -- just a little less convenient and time on top of a ladder.
- 48RagwingPilot
- Posts: 144
- Joined: Wed Dec 12, 2012 3:28 am
Re: Hartiwg (Monarch) Fuel Caps on a Ragwing
I am considering the Hartwig (Monarch) fuel cap mod as a winter project for my '48 C170. Did the Association ever acquire the Form 337 that Mr. Wood spoke of in his earlier posts? If not, has anyone else performed this mod and, if so, would you be willing to share your paperwork? Thx.
- 48RagwingPilot
- Posts: 144
- Joined: Wed Dec 12, 2012 3:28 am
Re: Hartiwg (Monarch) Fuel Caps on a Ragwing
Can anyone at least provide a "yes" or "no" on the question whether paperwork for this mod is available through the Association? Thx.
- 48RagwingPilot
- Posts: 144
- Joined: Wed Dec 12, 2012 3:28 am
Re: Hartiwg (Monarch) Fuel Caps on a Ragwing
Problem solved. Thx!!
Re: Hartiwg (Monarch) Fuel Caps on a Ragwing
and the answer was...???
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
- Ryan Smith
- Posts: 1210
- Joined: Tue Nov 25, 2008 4:26 am
Re: Hartiwg (Monarch) Fuel Caps on a Ragwing
So I've seen Monarch caps on 180s...why can't these be adapted to use in 170As and 170Bs, particularly if they're vented?
- 48RagwingPilot
- Posts: 144
- Joined: Wed Dec 12, 2012 3:28 am
Re: Hartiwg (Monarch) Fuel Caps on a Ragwing
Does anyone know a DER who can help me with a field approval for Monarch fuel caps!? Thx.
Re: Hartiwg (Monarch) Fuel Caps on a Ragwing
NOTE: This is a different cap than that which was originally produced by "Monarch" and was condemned because it did not meet venting-pressure-specs and was dangerous, resulting in the FAA removing Monarch's mfr'g approval.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
- 48RagwingPilot
- Posts: 144
- Joined: Wed Dec 12, 2012 3:28 am
Re: Hartiwg (Monarch) Fuel Caps on a Ragwing
Hartwig/Monarch premium fuel caps are still in production. Does anyone know a DER who operates in the Pacific NW?
Re: Hartiwg (Monarch) Fuel Caps on a Ragwing
http://www.faa.gov/other_visit/aviation ... ectory.pdf
Worth a try. I take it FSDO wouldn't do a field approval.
Worth a try. I take it FSDO wouldn't do a field approval.