# AD 47-30-05: Exhaust Stack Inspection

- Type: Airworthiness directive
- Status: Current
- Products: American Champion 11AC and 7AC
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 2,687 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/892981F7D36E59DB86256A38005273C0.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/47-30-05

## The airworthiness directive

47-30-05 AERONCA: (Was Service Note 2 of AD-759-3 and Service Note 2 of AD-761- 3.) Applies to Models 7AC and 11AC.

Inspection required not later than September 15, 1947, and each 50 hours thereafter on Model 7AC airplanes having serial numbers prior to No. 7AC-6797 and Model 11AC airplanes having serial numbers prior to No. 11AC-1697.

Due to difficulties in the manufacture of the exhaust stacks for these airplanes, it is necessary to inspect the stack "Y" junction for evidence of failure or deterioration. This inspection should be accomplished as follows:

A. Initial inspection (not later than September 30, 1947). The exhaust stacks on these airplanes should be removed from the airplane and checked visually in the vicinity of the "Y" junction for evidence of burning or flaking, tapped with a hammer for evidence of soft spots, and inspected to determine whether the stack is obstructed in any way.

B. Periodic inspection (each 50 hours). The exhaust stacks should be reinspected visually in the vicinity of the "Y" junction by removing the cabin and carburetor heater muffs each 50 hours of engine operation.

(This information is also contained in Aeronca Service Helps and Hints No. 25 dated May 13, 1947.)

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-759](https://openairdocs.org/tcds/A-759): American Champion Aircraft Corp.; names 1 of 22 models: 7AC
- [TCDS A-761](https://openairdocs.org/tcds/A-761): American Champion Aircraft Corp.; names 1 of 4 models: 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: 2,687 (2,687 by airframe model, 0 by engine model)
- Makers: Aeronca 2,481, Champion 202, American Champion 2, Aeronca/Miller/Delaney 1, Aeronca/Obrien 1

Models with the most aircraft:

- [Aeronca 7AC](https://openairdocs.org/model/aeronca-7ac): 1,878 aircraft (airframe model)
- [Aeronca 11AC](https://openairdocs.org/model/aeronca-11ac): 603 aircraft (airframe model)
- [Champion 7AC](https://openairdocs.org/model/champion-7ac): 144 aircraft (airframe model)
- [Champion AERONCA 7AC](https://openairdocs.org/model/champion-aeronca-7ac): 58 aircraft (airframe model)
- [American Champion 7AC](https://openairdocs.org/model/american-champion-7ac): 2 aircraft (airframe model)
- [Aeronca/Obrien 7AC](https://openairdocs.org/model/aeronca-obrien-7ac): 1 aircraft (airframe model)
- [Aeronca/Miller/Delaney 11AC](https://openairdocs.org/model/aeronca-miller-delaney-11ac): 1 aircraft (airframe model)

All 7 models: https://openairdocs.org/ad/47-30-05/models.md
Every aircraft: https://openairdocs.org/ad/47-30-05/aircraft.md

Its text cites no advisory circulars or STCs.

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