4600 Highway 183 Alternate
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Hays, KS 67601
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Airworthiness Directive: 123
Date: June 14, 2001
Subject: S-12S Flow Fence
Compliance: Mandatory
Models Effected: All S-12S with Warp Drive Propellers
Cost: None
Parts Provided: Foam Rubber
Builder Supplied Parts: Super Glue
S-12S aircraft equipped with the 912 and 912S engine have the potential of a rough start. When this occurs, it is
possible for the tip of the propeller to contact the flow fence.
Please take the following steps to prevent damage to the flow fence and propeller:
1.
Check if your aircraft has a 2” propeller spacer installed. A 2” spacer is required.
2.
Using a high speed cutting tool, like a Dremel®, cut out a notch as shown in
Figure 1
. Drill holes in locations
shown to prevent cracking.
Figure 1
1/2"
MD4106
1"
3"
DRILL 1/8"
(4 PLACES)
