# AD 48-43-02: Continental C-145-2 Engines

- Type: Airworthiness directive
- Status: Current
- Products: Cessna 170, 170A, 15AC and S15AC
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 960 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/944B357F212D024486256A33006F1C39.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/48-43-02

## The airworthiness directive

48-43-02 CESSNA and AERONCA: Applies to All Cessna Model 170 and Aeronca Model 15AC Airplanes Equipped With Continental C-145-2 Engines Serial Numbers 3001-8-2 to 3775- 8-2, Inclusive.

Compliance required not later than December 31, 1948.

Some piston pin plugs of the loose fit type with which the engines as noted were originally equipped, are subject to rapid and excessive wear which may eventually cause disintegration of the piston pin plugs, failure of pistons, and complete engine failure due to oil stoppage caused by metal particles on the screen and in the system.

To preclude the possibility of such failures, piston pin and plug assemblies, P/N 25262-A1 (with loose fit plugs), should be removed and replaced with piston pin and plug assemblies, P/N 530830 (with press fit plugs) as soon as possible, and in no case later than the compliance date shown.

Pending installation of the new assemblies, oil screens should be inspected prior to each flight. If aluminumparticles are evident on the screen the airplane should be removed from service until the change is accomplished.

(Continental Service Bulletins Nos. M48-20 and M48-25 cover this same subject.)

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-799](https://openairdocs.org/tcds/A-799): Textron Aviation Inc.; names 2 of 3 models: 170, 170A
- [TCDS A-802](https://openairdocs.org/tcds/A-802): AeroSedan LLC; names 2 of 2 models: S15AC, 15AC

## 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: 960 (960 by airframe model, 0 by engine model)
- Makers: Cessna 785, Aeronca 175

Models with the most aircraft:

- [Cessna 170A](https://openairdocs.org/model/cessna-170a): 513 aircraft (airframe model)
- [Cessna 170](https://openairdocs.org/model/cessna-170): 272 aircraft (airframe model)
- [Aeronca 15AC](https://openairdocs.org/model/aeronca-15ac): 162 aircraft (airframe model)
- [Aeronca S15AC](https://openairdocs.org/model/aeronca-s15ac): 13 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/48-43-02/models.md
Every aircraft: https://openairdocs.org/ad/48-43-02/aircraft.md

Its text cites no advisory circulars or STCs.

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