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
AI-generated summary from the source AD text. Verify against the official source before acting.
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.
Federal Register Abstract
Aileron reinforcement
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_47-20-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-20-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; ERCO Model 415-C, -CD and -D Aircraft Subject: Aileron reinforcement Status: Current Citation: This information is not available Citation Publish Date: Effective Date: Make: Univair Aircraft Corporation Model: 415-C | 415-CD | 415-D Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 47-20-06 CITATION: This information is not available PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-20-06 SUBJECT HEADING: Airworthiness Directives; ERCO Model 415-C, -CD and -D Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-20-06 ERCO: (Was Mandatory Note 14 of AD-718-6.) Applies Only to 415-C, -CD and -D Aircraft Serial Numbers 113-3784, Inclusive, Except the Following Which Have New Design Incorporated: 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. Compliance required not later than next 100-hour inspection unless visual inspection indicated immediate repair is required. Flexing of the lower aileron skin has resulted in fatigue cracks in the beam in the balance weight area. Inspect the beam and lower aileron skin carefully for cracks and drill relief holes at the ends of all cracks. Then add reinforcement plates (Erco P/N 415-16039-5 and -6) to the front face of the aileron beam and lower surface of the lower aileron skin, respectively, following the procedure outlined in Ercoupe Service Department Bulletin No. 20. (Blind, Type A, AN 450-4-10 may be used in lieu of Dupont Explosive DR134A-8 and DR134A-10 rivets, respectively.) Use new longer AN 526C632-7 truss head screws to reinstall the balance weight. Check the aileron rigging and the aileron bellcrank pushrod for freedom from binding in the rod end under full aileron travel before again placing the airplane in operation. (Ercoupe Service Department Bulletin No. 20 dated February 17, 1947, covers this subject in greater detail.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_47-20-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-20-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; ERCO Model 415-C, -CD and -D Aircraft Subject: Aileron reinforcement Status: Current Citation: This information is not available Citation Publish Date: Effective Date: Make: Univair Aircraft Corporation Model: 415-C | 415-CD | 415-D Product Type: Aircraft Product Subtype: Small Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 47-20-06 CITATION: This information is not available PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-20-06 SUBJECT HEADING: Airworthiness Directives; ERCO Model 415-C, -CD and -D Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-20-06 ERCO: (Was Mandatory Note 14 of AD-718-6.) Applies Only to 415-C, -CD and -D Aircraft Serial Numbers 113-3784, Inclusive, Except the Following Which Have New Design Incorporated: 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. Compliance required not later than next 100-hour inspection unless visual inspection indicated immediate repair is required. Flexing of the lower aileron skin has resulted in fatigue cracks in the beam in the balance weight area. Inspect the beam and lower aileron skin carefully for cracks and drill relief holes at the ends of all cracks. Then add reinforcement plates (Erco P/N 415-16039-5 and -6) to the front face of the aileron beam and lower surface of the lower aileron skin, respectively, following the procedure outlined in Ercoupe Service Department Bulletin No. 20. (Blind, Type A, AN 450-4-10 may be used in lieu of Dupont Explosive DR134A-8 and DR134A-10 rivets, respectively.) Use new longer AN 526C632-7 truss head screws to reinstall the balance weight. Check the aileron rigging and the aileron bellcrank pushrod for freedom from binding in the rod end under full aileron travel before again placing the airplane in operation. (Ercoupe Service Department Bulletin No. 20 dated February 17, 1947, covers this subject in greater detail.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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