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Aileron Bellcrank bolt specs

M

MEM-PA12

Registered User
For the last 3 evenings I have looked all over the parts manual for the part number of the bolt that attaches the bell rank to the wing. I believe it is an oversized NAS shear bolt but can’t seem to find it anywhere.

Would anyone have any better detail on it?

Thanks!
 
MS24694-S62 or -60 for rod end. Normal bolt I think for bell crank mount, drilled.


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Update: the bolt that goes through the bellcrank is an AN4-25 drilled.
The odd screw (with the beveled head) as Mike MCS Repair notes above is an MS24694-S62 or Piper PN 12713-006.
 
MEM-PA12 said:
Update: the bolt that goes through the bellcrank is an AN4-25 drilled.
The odd screw (with the beveled head) as Mike MCS Repair notes above is an MS24694-S62 or Piper PN 12713-006.
Click to expand...

Spruces numbers might not exactly match, is what I was inferring.. But I got 3 diffrent sizes in stock now after learning that... if anyone needs


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Here is a photo of the differences between the Spruce and Univair screws:
FB58FD21-4C82-4E09-AC02-12CAD0EE641D.jpeg
This is a Spruce S63 and has at least 3 threads showing after the locknut.
 

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Look those ears over very closely- have found lots of them cracked- from guys not putting the proper washers in between the rod end and the ears and pinching it down. Pa-12/J-5/Pa-14 aileron and PA-18 flap cast (original) bellcranks.
 
Yes, I read a post or two about those commonly being cracked. I feel good about mine but will also regularly inspect them too. Also, SB 109 addresses these possible cracks and the inspection requirement of the bellcranks.
 
Last edited:
ak49flyer said:
Look those ears over very closely- have found lots of them cracked- from guys not putting the proper washers in between the rod end and the ears and pinching it down. Pa-12/J-5/Pa-14 aileron and PA-18 flap cast (original) bellcranks.
Click to expand...

Do you know if there is an AN960 equivalent to those Piper 80122-7 washers?
 
The shank length is what is important, people would tighten down on a shorter shanked screw and crack the ears of the casting.
 
MEM-PA12 said:
Do you know if there is an AN960 equivalent to those Piper 80122-7 washers?
Click to expand...

Per the Piper drawing:
80122-7 1/2" OD x .191 ID- .045 thick 1025 Steel
Called out between the bellcrank and the rod end on the flap bellcrank on a PA18 and then in the later parts manual is called out as a 407-564 (AN960-10).
 
MEM-PA12 said:
Yes, I read a post or two about those commonly being cracked. I feel good about mine but will also regularly inspect them too. Also, SB 109 addresses these possible cracks and the inspection requirement of the bellcranks.
Click to expand...
If you have your wings opened up, I'd urge you to seriously consider spending the money and installing the billet cranks.
 
ak49flyer said:
Just found another one today:
Click to expand...

Wow, hot topic. I have one wing covered and am about to cover the second wing. The billet cranks are looking more attractive. I believe you can still remove the crank carefully from the rectangular inspection opening after covering...though not nearly as easy. I will give this some consideration.
 
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