Hydraulic leak - can't find the source

AV8ing · #1 09-12-23, 02:25 PM

I have the "Cessna 337 Series Parts Catalog - 1965 - 1969" .

In Fig 46 is shows the main gear door strut actuator but no break-out for the internal seals.

The up-lock and maingear doors are detailed in Figs 122 and 122A

That said , I looked up the MS2774 & 5 o-rings - not found.

Further the "S1121-389 CESSNA AIRCRAFT PARTS & ACCESSORIES RING, BACK UP TEFLON" listing @ $129 !!!

Surely someone has complied a shopping list using generic PN s?

Kim Geyer · #2 09-12-23, 07:48 PM

You should look up MS28774 and MS28775 orings and I think the backup Teflon rings should have the same dash number. The -329 is huge
I think I still have a book and will check in the morning

Skymaster337B · #3 09-12-23, 07:55 PM

It’s good that you caught that. If the fluid drained out the gear would not unlock. The spring locks the gear up. And only hydraulic pressure will release it.

AV8ing · #4 09-13-23, 04:31 AM

Quote:

Originally Posted by Skymaster337B

It’s good that you caught that. If the fluid drained out the gear would not unlock. The spring locks the gear up. And only hydraulic pressure will release it.

Yikes, that's not a good "fail" mode ....

AV8ing · #5 09-13-23, 04:35 AM

Can't find the break-out for the up-lock actuator in the IPC - says see Fig 46... in Fig 46 .

Need cross ref's for MS28774 teflon packings .

Need alternative PNs for : S1120-363, S1120-181, S1121-389, S1121-207

Thanks!

TomM · #6 09-13-23, 10:54 AM

With the exception of S1121-207, Airpower has all the Cessna parts numbers in stock for $15 or less each. The S1121-207 must be made of Kriptonite, they have it in stock, but it is $129. So other than that part, the pricing seems really reasonable. Many times they list alternate MS or AN part numbers for Cessna numbers, but not for that part........

RandyArizona · #7 09-13-23, 08:54 PM

https://www.airpowerinc.com/s1121-207
$12.39

56 in stock, available to ship now.