Broken aileron pulley bracket, 0411534

Ask Questions and Offer Advice Related to the Cessna 120 & 140 Type

Moderators: 6643, 6183, V529

Forum rules
You must be a member of the Cessna 120-140 Association in order to post new topics, reply to existing topics, or search for information on this forum. Use the "Join" link in the red menu bar.
8475
Posts: 50
Joined: Sun May 26, 2019 11:38 am
Location: SF Bay
Name: Dave Sprinkle
Aircraft Type: 140
Occupation-Interests: Engineer
Contact:

Broken aileron pulley bracket, 0411534

Post by 8475 »

I found a broken aileron pulley bracket. Scary. Is this a common failure? And are there replacement parts available?
Attachments
C140 upper left aileron pulley bracket  0411534, 1024.jpg
C140 upper left aileron pulley bracket 0411534, 1024.jpg (155.68 KiB) Viewed 295 times
8342
Posts: 252
Joined: Sun Oct 14, 2018 11:55 pm
Location: KUSE Wauseon OH
Name: Rick F
Aircraft Type: C-140
Occupation-Interests: Captain B-777
Contact:

Re: Broken aileron pulley bracket, 0411534

Post by 8342 »

Deleted
Last edited by 8342 on Thu Nov 24, 2022 4:21 am, edited 1 time in total.
6298
Posts: 224
Joined: Tue May 01, 2018 7:00 am
Location: California
Name: Randy Thompson
Aircraft Type: Cessna 140
Occupation-Interests: Work on airplanes and engines
Contact:

Re: Broken aileron pulley bracket, 0411534

Post by 6298 »

Looks like it’s been broken for a while and the cable has been dragging on the right side.
Randy Thompson A&P IA Pilot
Hold STC SA547EA for installation of O-200 engine in Cessna 120/140 and 140A"s
Overhaul small Continentals
eromstadt
Posts: 3
Joined: Sun Jun 20, 2021 4:54 pm
Name:
Aircraft Type:
Occupation-Interests:
Contact:

Re: Broken aileron pulley bracket, 0411534

Post by eromstadt »

I agree with Randy. Good thing you caught it before your next flight. What made you check on it? I've got replacements though.
8475
Posts: 50
Joined: Sun May 26, 2019 11:38 am
Location: SF Bay
Name: Dave Sprinkle
Aircraft Type: 140
Occupation-Interests: Engineer
Contact:

Re: Broken aileron pulley bracket, 0411534

Post by 8475 »

25 hours ago I removed all the pulleys, cleaned and lubricated the bushing, and replaced the fasteners. Then rigged the aileron travel and set tension to roughly 1/2 of the factory recommendation. In my most recent flight, I felt like something had changed. I was unhappy with the roll response, high friction, high backlash, and sluggish response. This is the result of my investigation.

Also, I just removed the counterpart bracket. It appears to have a crack in the same area.
8475
Posts: 50
Joined: Sun May 26, 2019 11:38 am
Location: SF Bay
Name: Dave Sprinkle
Aircraft Type: 140
Occupation-Interests: Engineer
Contact:

Re: Broken aileron pulley bracket, 0411534

Post by 8475 »

@eromstadt, I'll buy a set of those brackets from you.
eromstadt
Posts: 3
Joined: Sun Jun 20, 2021 4:54 pm
Name:
Aircraft Type:
Occupation-Interests:
Contact:

Re: Broken aileron pulley bracket, 0411534

Post by eromstadt »

Can do. Send me a direct message and we can sort out details. I've got pulleys and keepers also, just let me know what all you'll need and I'll get some pictures over to you by Friday.
V529
Posts: 471
Joined: Tue May 01, 2018 7:00 am
Location: Michigan
Name: Victor G
Aircraft Type: C-120
Occupation-Interests: Work on airplanes till the cows come home..........they're still out.
Contact:

Re: Broken aileron pulley bracket, 0411534

Post by V529 »

This is a "somewhat" common failure. Years ago there was an article in the newsletter about this situation.

As you can see the nut fits tightly inside the bracket as it's held to the fuselage. I can't recall, but I believe the concern was the washers sometimes had sharp edges that started a stress line in the bracket. I'll see if I can dig that one up.

I check mine each annual. If you don't mind, can I use your picture(s?) and write an article about it, since it's been years that this was last brought up.
8475
Posts: 50
Joined: Sun May 26, 2019 11:38 am
Location: SF Bay
Name: Dave Sprinkle
Aircraft Type: 140
Occupation-Interests: Engineer
Contact:

Re: Broken aileron pulley bracket, 0411534

Post by 8475 »

V529 wrote: Thu Nov 24, 2022 7:59 am This is a "somewhat" common failure. Years ago there was an article in the newsletter about this situation.

As you can see the nut fits tightly inside the bracket as it's held to the fuselage. I can't recall, but I believe the concern was the washers sometimes had sharp edges that started a stress line in the bracket. I'll see if I can dig that one up.

I check mine each annual. If you don't mind, can I use your picture(s?) and write an article about it, since it's been years that this was last brought up.
Please do use this picture. I think it's important to document this. And thank you.
rominoff
Posts: 14
Joined: Sun Dec 06, 2020 7:36 am
Location: Bothell, WA
Name: Bradley Bell
Aircraft Type: '47 C140; '48 NAVI
Occupation-Interests: Software Development; A&P
Contact:

Re: Broken aileron pulley bracket, 0411534

Post by rominoff »

https://www.ebay.com/itm/174833599053?e ... R-rH2qqXYQ

Perhaps this will work, perhaps not?
Post Reply

Who is online

Users browsing this forum: No registered users and 11 guests