AD 48-04-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | American Champion Aircraft Corp. | 11AC | Airworthiness Directives; Aeronca Model 7AC, 11BC and 11AC Airplanes |
| aircraft | American Champion Aircraft Corp. | 11BC | Airworthiness Directives; Aeronca Model 7AC, 11BC and 11AC Airplanes |
| aircraft | American Champion Aircraft Corp. | 7AC | Airworthiness Directives; Aeronca Model 7AC, 11BC and 11AC Airplanes |
Unsafe Condition
Buckled nose ribs or loose PK screws in the wing leading edge could lead to structural failure of the wing.
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Required Actions
Inspect wing leading edge by pressing skin to nose ribs. Install additional PK screws or Cherry CR163-4-2 rivets in all nose ribs as specified. Repair damaged ribs by cutting away at spar and using factory kits P/N 5-185-2 and 5-190-2.
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Compliance Time
March 1, 1948
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Affected Aircraft
American Champion Aircraft Corp. Models 7AC (serials 7AC-1 through 7AC-7129), 11BC (serials 11BC-1 through 11BC-173), and 11AC (serials 11AC-1 and up)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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