I can supply the upper tube assembly P/N: 21707-000; these have become scarce in serviceable condition. The sheared turn stop can be repaired, there is an FAA-approved shop in Wisconsin providing this service. I usually have their repaired tubes in stock, EXCHANGE ONLY, on repairable cores NOT CRACKED.

See Service Letter SL-596A

I have 12 cracked cores, Webco Aircraft says they have 25 of them. Someone has to step up and make a repair available, probably the owner-produced type.

Piper Service Letter SL-596A, NAS 1303-8H, 21719-011

These holes were damaged from inadequate torque on the old-style AN3 bolts. One cause is from paint thickness fretting, a thin coat of primer only is allowed between mating components [this applies to multiple applications]. The NAS bolts, which are high strength, associated with SL-596A will help avoid this situation.

Piper Service Letter SL-596A, NAS 1303-8H, 21719-011

Fixture to properly tap for Heli-Coil inserts

Piper Service Letter SL-596A, NAS 1303-8H, 21719-011

The bushing for the steering damper P/N: 452-379 [old 21835-004] is typically worn, the one in the photo is cracked. I have these in stock; note the bushing must be reamed to 0.250″ after installation.

Also note the loosely-installed torque link bushing, these [in pair] will need to be replaced and reamed to 0.3125″ also.

Piper Service Letter SL-596A, NAS 1303-8H, 21719-011

Sheared turn stop weld repair

Piper Service Letter SL-596A, NAS 1303-8H, 21719-011

Repair of sheared turn stop, awaiting torque link bushings installation and reaming

Example of cracked tube 21707-000

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P/N 21707-000 typical cracked tube

Contact Comanche Gear

Please provide your complete details for invoicing such as your Card Billing Address, Shipping Address, and Aircraft Information. If you want to gab on the phone don’t hesitate to call, especially if you want to order something. If you have a problem-solving dilemma I can help with that too. This website doesn’t have internet ordering capabilities; that is for those more sophisticated. My email isn’t shown here because of scam artists and other shenanigans.

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