# AD 49-15-01: Seat Anchorage Rework

- Type: Airworthiness directive
- Status: Current
- Products: American Champion 11AC, 11BC and S11AC
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 676 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C83E203A153EFD0386256A380052B4B1.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/49-15-01

## The airworthiness directive

49-15-01 AERONCA: Applies to All Models 11AC, S11AC and 11BC Aircraft.

To be accomplished not later than July 1, 1949.

In order to prevent the seat belt anchorage from failing during crash landings, it has been found necessary to modify the seat installation as follows:

1. If there is no need for an adjustable seat, the rear sliding lugs on each side of the seat should be bolted to the slide tube using 3/16- or 1/4-inch diameter AN bolts.

2. If the seat is to remain adjustable, two 1/8 7 x 19 steel snare cables looped around each end of the seat frame cross tube and the lower end of the vertical slide fuselage tube located aft of the seat should be installed so that they will be taut with the seat in the most forward position. Any approved type cable clamp may be used for joining the ends of the cable.

(Aeronca Helps and Hints No. 42 covers this same subject.)

This supersedes AD 49-13-01.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-761](https://openairdocs.org/tcds/A-761): American Champion Aircraft Corp.; names 3 of 4 models: 11BC, S11AC, 11AC

## 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: 676 (676 by airframe model, 0 by engine model)
- Makers: Aeronca 674, Aeronca/Miller/Delaney 1, Champion 1

Models with the most aircraft:

- [Aeronca 11AC](https://openairdocs.org/model/aeronca-11ac): 603 aircraft (airframe model)
- [Aeronca 11BC](https://openairdocs.org/model/aeronca-11bc): 65 aircraft (airframe model)
- [Aeronca S11AC](https://openairdocs.org/model/aeronca-s11ac): 6 aircraft (airframe model)
- [Aeronca/Miller/Delaney 11AC](https://openairdocs.org/model/aeronca-miller-delaney-11ac): 1 aircraft (airframe model)
- [Champion 11BC](https://openairdocs.org/model/champion-11bc): 1 aircraft (airframe model)

All 5 models: https://openairdocs.org/ad/49-15-01/models.md
Every aircraft: https://openairdocs.org/ad/49-15-01/aircraft.md

Its text cites no advisory circulars or STCs.

## NTSB investigations that cite this AD (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB ATL04FA046](https://openairdocs.org/ntsb/ATL04FA046), Dec 5, 2003: Aeronca 11AC (N9085F), San Antonio, FL, substantial damage, 1 fatal. Probable cause: The pilot's failure to maintain clearance above objects on approach, which resulted in an in-flight collision with trees and the subsequent collision with terrain.

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