# AD 47-20-06: Aileron reinforcement

- Type: Airworthiness directive
- Status: Current
- Products: Univair 415-C, 415-CD and 415-D
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 1,005 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9AD4B8CCC7CC79BD86256A4D005DE266.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/47-20-06

## The airworthiness directive

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 DupontExplosive 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.)

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-718](https://openairdocs.org/tcds/A-718): Univair Aircraft Corporation; names 2 of 2 models: 415-CD, 415-C
- [TCDS A-787](https://openairdocs.org/tcds/A-787): Univair Aircraft Corporation; names 1 of 8 models: 415-D

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 1,005 (1,005 by airframe model, 0 by engine model)
- Makers: Ercoupe 772, Engineering & Research 200, Forney 20, Erco 12, Univair 1

Models with the most aircraft:

- [Ercoupe 415-C](https://openairdocs.org/model/ercoupe-415-c): 623 aircraft (airframe model)
- [Engineering & Research 415-C](https://openairdocs.org/model/engineering-research-415-c): 160 aircraft (airframe model)
- [Ercoupe 415-D](https://openairdocs.org/model/ercoupe-415-d): 101 aircraft (airframe model)
- [Ercoupe 415-CD](https://openairdocs.org/model/ercoupe-415-cd): 48 aircraft (airframe model)
- [Engineering & Research 415-D](https://openairdocs.org/model/engineering-research-415-d): 24 aircraft (airframe model)
- [Forney 415-C](https://openairdocs.org/model/forney-415-c): 17 aircraft (airframe model)
- [Engineering & Research 415-CD](https://openairdocs.org/model/engineering-research-415-cd): 16 aircraft (airframe model)
- [Erco 415-C](https://openairdocs.org/model/erco-415-c): 7 aircraft (airframe model)
- [Erco 415-D](https://openairdocs.org/model/erco-415-d): 4 aircraft (airframe model)
- [Forney 415-D](https://openairdocs.org/model/forney-415-d): 2 aircraft (airframe model)
- [Forney 415-CD](https://openairdocs.org/model/forney-415-cd): 1 aircraft (airframe model)
- [Erco 415-CD](https://openairdocs.org/model/erco-415-cd): 1 aircraft (airframe model)
- [Univair 415-D](https://openairdocs.org/model/univair-415-d): 1 aircraft (airframe model)

All 13 models: https://openairdocs.org/ad/47-20-06/models.md
Every aircraft: https://openairdocs.org/ad/47-20-06/aircraft.md

Its text cites no advisory circulars or STCs.

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