AD 46-23-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Noorduyn Aviation Ltd. | Army UC-64 | Airworthiness Directives; Noorduyn Models Army UC-64, -64A, and -64B Aircraft |
| aircraft | Noorduyn Aviation Ltd. | Army UC-64A | Airworthiness Directives; Noorduyn Models Army UC-64, -64A, and -64B Aircraft |
| aircraft | Noorduyn Aviation Ltd. | Army UC-64B | Airworthiness Directives; Noorduyn Models Army UC-64, -64A, and -64B Aircraft |
Unsafe Condition
Defective or deteriorated wood in the horizontal stabilizer ribs due to lack of drain holes, leading to water accumulation and structural damage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the trailing edge of the horizontal stabilizer for drain holes. If drain holes are absent, remove fabric to inspect ribs, replace defective wood, and drill 1/16-inch diameter drain holes spaced to drain all pockets.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
At next periodic inspection.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Noorduyn Models Army UC-64, -64A, and -64B Aircraft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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