AD 47-20-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Univair Aircraft Corporation | 415-C | Airworthiness Directives; ERCO Model 415-C, -CD and -D Aircraft |
| aircraft | Univair Aircraft Corporation | 415-CD | Airworthiness Directives; ERCO Model 415-C, -CD and -D Aircraft |
| aircraft | Univair Aircraft Corporation | 415-D | Airworthiness Directives; ERCO Model 415-C, -CD and -D Aircraft |
Unsafe Condition
Fatigue cracks in the aileron beam in the balance weight area due to flexing of the lower aileron skin.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the aileron beam and lower skin for cracks, drill relief holes at crack ends, install reinforcement plates (Erco P/N 415-16039-5 and -6), use new AN 526C632-7 truss head screws for balance weight reinstallation, and check aileron rigging and bellcrank pushrod for binding.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
next 100-hour inspection unless visual inspection indicates immediate repair is required
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Affected Aircraft
ERCO Model 415-C, -CD, and -D aircraft serial numbers 113-3784 inclusive, except serials 3719, 3720, 3723, 3724, 3726, 3729, 3732, 3735, 3738, 3741, 3742, 3744, 3745, 3747, 3750, 3753, 3756, 3759, 3762, 3764, 3765, 3767, 3768, 3771, 3774, 3777, 3780, 3783 which have new design incorporated.
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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