Nosegear actuator

wslade2 · #1 10-11-20, 05:58 PM

While servicing strut noticed small leak in nosegear actuator. Removed it and sent it out for overhaul. Overhaul shop advised needed pins that engage the hook replaced. Same issue as service bulletin for cessna 210, 100 and 200 series retractable aircraft. Old style pin that the hook engages (which holds your gear in the down and locked position) is subject to fracture/failure. There is a new style pin to put in place. Also the spring that is part of the locking mechanism has a guide inside of it. Original guide plastic and if fails, spring can fall out, mechanism doesn't stay locked and nosegear will fold on you (also like 210). Amazingly I had the original 50 yr old plastic guide in place. Like the rest of the plastic I'm sure it wasn't long till it gave out. Something worth looking at. Had everything done. Good piece of mind.

hharney · #2 10-11-20, 07:47 PM

Where did you source the parts/repair

wslade2 · #3 10-12-20, 12:31 AM

Sent the cylinder to Cox Airparts in Wichita. They did the overhaul pins and everything and bench tested before sending back. I asked before sending my cylinder to them if they wanted the hook/pin mechanism to come with the cylinder and they said yes, to test it. Once it got there they advised about the pin issue. Although I sent it for a leak/overhaul, while they had it they updated the hook pin mechanism. Very happy with them.

I was suspicious about my plastic spring guide, that plastic was in such a critical area, and questioned it's age/integrity. Discovered the spring guide issue while combing old Cessna Pilots Association articles where John Frank wrote about it on cessna 210's. I then found service letter for 337's advising the updated steel spring guide.

Multimotor · #4 10-12-20, 06:02 PM

Quote:

Originally Posted by wslade2

Sent the cylinder to Cox Airparts in Wichita. They did the overhaul pins and everything and bench tested before sending back. I asked before sending my cylinder to them if they wanted the hook/pin mechanism to come with the cylinder and they said yes, to test it. Once it got there they advised about the pin issue. Although I sent it for a leak/overhaul, while they had it they updated the hook pin mechanism. Very happy with them.

I was suspicious about my plastic spring guide, that plastic was in such a critical area, and questioned it's age/integrity. Discovered the spring guide issue while combing old Cessna Pilots Association articles where John Frank wrote about it on cessna 210's. I then found service letter for 337's advising the updated steel spring guide.

What is the service letter number? We're not supposed to post copies of Cessna's SLs, but that doesn't mean we can't link to their site where they have them posted.

wslade2 · #5 10-13-20, 07:38 AM

Oh yeah, that's right not supposed to post service letters on the site.

Regarding the spring guide: it is what was then titled "Multiengine Customer Care Service Information Letter" or "Multiengine Service Letter" dated Jan 13, 1984, number ME84-1. Specifically for the 337 announcing the new steel guide and superceded part number.

Skymaster337B · #6 10-14-20, 02:10 AM

The pin you mentioned was also plastic. The new pins are metal. Unbelievable Cessna thought that was a good idea.

mshac · #7 10-14-20, 12:23 PM

Quote:

Originally Posted by wslade2

Oh yeah, that's right not supposed to post service letters on the site.

Regarding the spring guide: it is what was then titled "Multiengine Customer Care Service Information Letter" or "Multiengine Service Letter" dated Jan 13, 1984, number ME84-1. Specifically for the 337 announcing the new steel guide and superceded part number.

I'm interested to read this, but I cannot find it anywhere, even on the Cessna Support docs directory page. Its as if it never existed.

If anyone can point to where this Service letter can be found, it would be greatly appreciated.

JAG · #8 10-14-20, 03:18 PM

Hi Mark,
You can find all the publications on Textron Aviation's Service Information website. It is free to get access to it, but if I remember, you have to sign some documents, etc, to get set up with a user and password. If you already have access to this, don't search for the exact document number, just type in ME84, and you will get a list of all the ME84 letters, etc, and it will be there.

https://ww2.txtav.com

Jeff

mshac · #9 10-14-20, 05:57 PM

I have an account, but it says "Not authorized to Subscribe to Publications", then it asks me for a customer number.

Way too complicated. I never did see it.

wslade2 · #10 10-15-20, 11:41 AM

Or, I found it through Google.

TomM · #11 10-15-20, 12:43 PM

Try this link for all the service bulletins. This is for my serial number, but if you change the end of the link to your serial number then you will get your listing:

https://support.cessna.com/custsupt/...erial=337-0361

Multimotor · #12 10-15-20, 01:08 PM

Quote:

Originally Posted by wslade2

Oh yeah, that's right not supposed to post service letters on the site.

Regarding the spring guide: it is what was then titled "Multiengine Customer Care Service Information Letter" or "Multiengine Service Letter" dated Jan 13, 1984, number ME84-1. Specifically for the 337 announcing the new steel guide and superceded part number.

https://ww2.txtav.com/TechnicalPubli...Number=ME84-01

You'll probably have to have an account to access.

In a nutshell, the SL announces the availability of the new part, P/N 9882024-1, and says to install with reference to the service manual. List price is $68.14, $61.33 from Yingling.

mshac · #13 10-15-20, 05:52 PM

Thanks, I was finally able to read it.

Can anyone speak to the difficulty level of installing the new part?

I scoured my logs and found no mention of this part, so I assume mine is still all plastic.

I did find out I have the upgraded fuel caps option installed though!

Skymaster337B · #14 10-16-20, 01:37 AM

I highly recommend that if you are going thru the trouble to replace the spring cap, pull the entire actuator out and overhaul it.

JAG · #15 10-18-20, 01:31 PM

Just so everyone is aware, the new (replacement pin) still has plastic, so you really have to look close before you go pulling this out if you see some white plastic. I have included photos of the new replacement pin - note the guide is still plastic.

Mark, it is not difficult to replace this, but it does involve removing the actuator and downlock. It is not tricky to rig on install, but takes some patience and is a tight area. You want to rig it perfectly too, on install.

Jeff