# AD 68-18-02: Oil Pressure Gauge Line

- Type: Airworthiness directive
- Status: Current
- Products: Cessna 177
- Effective: September 5, 1968
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-647
- Registered aircraft: 446 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/05C2815E77C679A686256A1C007496C2.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/68-18-02

## The airworthiness directive

68-18-02 CESSNA: Amendment 39-647. Applies to Model 177, Serial Numbers 661, and 17700001 and 17700003 through 17701164 airplanes.

Compliance: Required within the next 10 hours' time-in-service after the effective date of this airworthiness directive, unless already accomplished.

To prevent failure of the oil pressure gauge line between the engine crankcase and aircraft firewall, accomplish the following:

      (A) Replace the copper oil pressure gauge line assembly between the engine crankcase and aircraft firewall with a flexible hose assembly in accordance with Cessna Service Letter No. SE68-14, Supplement No. 1, dated August 23, 1968, or any equivalent modification approved by the Chief, Engineering and Manufacturing Branch, Central Region.

This amendment becomes effective September 5, 1968.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A13CE](https://openairdocs.org/tcds/A13CE): Textron Aviation Inc.; names 1 of 3 models: 177

## 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: 446 (446 by airframe model, 0 by engine model)
- Makers: Cessna 446

Models with the most aircraft:

- [Cessna 177](https://openairdocs.org/model/cessna-177): 446 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/68-18-02/models.md
Every aircraft: https://openairdocs.org/ad/68-18-02/aircraft.md

Its text cites no advisory circulars or STCs.

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