What aircraft is the ABI PA-18 three-leaf steel tailspring compatible with?

The ABI-PA18-1 and ABI-PA18-2 tailsprings are designed for certified Piper PA-18 Super Cub aircraft. The installation is FAA STC approved under SA02573AK.

What is the difference between ABI-PA18-1 and ABI-PA18-2?

ABI-PA18-1 is the 1-bolt configuration and ABI-PA18-2 is the 2-bolt configuration. Both are three-leaf steel tailsprings with identical performance specs. Choose based on your airframe's tailwheel attachment configuration.

What does the ABI three-leaf steel tailspring weigh?

The ABI-PA18-1 and ABI-PA18-2 tailsprings weigh 5.6 lbs each.

What is the drop test rating for the ABI PA-18 steel tailspring?

The ABI-PA18-1 and ABI-PA18-2 are drop-test rated to 5.7 G.

Does the ABI PA-18 steel tailspring require STC documentation?

Yes, for certified aircraft. The STC is SA02573AK. STC paperwork is available separately under part number SA02573AK if you already have the spring installed and only need the documentation.

How does the steel tailspring compare to the titanium tailspring for the PA-18?

Both replace the OEM tailspring and absorb landing energy, but the titanium version (ABI-51599 series) is significantly lighter and offers superior shock absorption and elasticity. The steel spring (ABI-PA18-1/2) is the more cost-effective option. The T3 dual shock system (ABI-51343) provides the highest energy absorption and rebound control for heavy use or backcountry operations.

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Home / Shop Parts / ABI-PA18-2

Drop Testing Tailsprings: Steel vs. Titanium vs. Dual Shock

P/N: ABI-PA18-2

Name: PA-18 THREE LEAF TAILSPRING, 2 BOLT
Brand: Alaska Gear Company
SKU: ABI-PA18-2
Price: 601.0 USD
Availability: BackOrder

PA-18 THREE LEAF TAILSPRING, 2 BOLT

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Please verify that this product is eligible for your aircraft before adding it to your cart.

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Approval	FAA PMA, FAA PMA STC
Condition	New
Manufacturer	Alaska Gear Company
Dimensions	N/A
Weight	11 lbs
Unit of Measure	Each
Retail Price	$751.25
Your Price	$601.00
Stock Status	Expected ship date is 06-16-2026. alternates Notify me when it's back in stock Email *

Eligible Aircraft

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Eligible Aircraft

Make	Model	Start S/N	End S/N	Eligibility Chart
Piper	PA-18	18-1	18-7632	7842
Piper	PA-18-105 (Special)	18-1	18-7632	7842
Piper	PA-18-125 (Army L-21A)	18-1	18-7632	7842
Piper	PA-18-135 (Army L-21B)	18-1	18-7632	7842
Piper	PA-18-150	1809001	1809113	7842
Piper	PA-18-150	18-3771	18-8309025	7842
Piper	PA-18A	18-1	18-7632	7842
Piper	PA-18A-135	18-1	18-7632	7842
Piper	PA-18A-150	18-3771	18-8309025	7842
Piper	PA-18AS-125	18-1	18-7632	7842
Piper	PA-18AS-135	18-1	18-7632	7842
Piper	PA-18AS-150	18-3771	18-8309025	7842
Piper	PA-18S	18-1	18-7632	7842
Piper	PA-18S-105 (Special)	18-1	18-7632	7842
Piper	PA-18S-125	18-1	18-7632	7842
Piper	PA-18S-135	18-1	18-7632	7842
Piper	PA-18S-150	1809001	1809113	7842
Piper	PA-18S-150	18-3771	18-8309025	7842
Piper	PA-19 (Army L-18C)	19-1	19-3	7842
Piper	PA-19S	19-1	19-3	7842
Piper	PA-19S	19-1	19-3	7842

Eligibility Chart 7842 Notes

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Product Details

ABI Piper PA-18 Three Leaf Tailspring

Three-leaf Steel Tailspring For Piper PA-18 Super Cub

The ABI-PA18-1 and ABI-PA18-2 tailsprings reliably absorb and dissipate landing energy to minimize bounce.
At 5.6 lbs, it balances durability with weight efficiency. A dependable, cost-effective tailwheel solution for certified PA-18 aircraft.