Mandatory wing strut fork hardware Service Bulletin - SB1172

[pa20]

I seem to recall the heads are marked differently on the AN bolts vs the Special Bolts.
A look at the hardware on the Univair or AC Spruce catalogs might she'd some light on this.
Somebody here might be able to post a pic of a known "correct" bolt, showing the marking, for comparison.
And of course the short castellated nuts are easy to identify vs conventional castellated nuts.

GG

The correct bolts are spelled out by P/N in the SB. Also, the SB calls out the markings on the head. Differentiation between between bolts is readily done by looking at the head markings. A good guide is the Standard Aircraft Handbook.

[Glen Geller]

Thanks Mark, I was posting on my phone and from memory, when I looked at the SB 1172A I found the information I was trying to recall:

1. Locate the bolted joints (total 4 per aircraft) at the lower end of the Front & Rear Lift Strut Assemblies, left and
right hand sides of the aircraft, and compare to Figure 1 and Figure 2 below.
Note the orientation and stack-up of nut, bolt, cotter pin (and if applicable, washers) at this bolted joint. Bolts
will have head markings as follows:
* For Figure 1, the bolt head marking reads NAS 464P.
* For Figure 2, the bolt head marking reads 13241.
This inspection must be accomplished within 100 hours of operation.

Its all there at http://www.shortwingpipers.org/photo...er_sb1172a.pdf

Cheers,
GG

[at7615]

Just to clarify, are the lower lift struts bolts the same for the small fork and the 5/8 sealed strut fork?

https://www.univair.com/piper/piper-j-5/view-all/u13241-000-piper-lift-strut-clevis-bolt/

[Steve Pierce]

Yes, same bolt.

[walt.buskey]

Ditto. I used the "Piper Special Bolts" on my AK Airframes sealed struts (w/5/8" forks). (Wow, things just go up! Mine were only $12 each back in 2013...)