# AD 75-25-03: Engine Oil

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-34-200T
- Effective: December 10, 1975
- Published: December 4, 1975
- Issued: November 24, 1975
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-2448
- Registered aircraft: 563 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/09F3616294D4F6EF8625699900514B8A.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/75-25-03

## The airworthiness directive

75-25-03 PIPER AIRCRAFT CORPORATION: Amendment 39-2448. Applies to PA- 34-200T airplanes, serial numbers 34-7570001 through 34-7670077 certificated in all categories.

Compliance required within the next 25 hours' time in service after the effective date of this AD, unless already accomplished.

To prevent loss of engine oil, accomplish the following:

Replace the existing engine oil pressure hose assemblies with a tube assembly and a new hose assembly in accordance with Piper Service Bulletin Number 483 or in an equivalent manner approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, P.O. Box 20636, Atlanta, Georgia 30320.

This amendment becomes effective December 10, 1975.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A7SO](https://openairdocs.org/tcds/A7SO): Piper Aircraft Inc.; names 1 of 5 models: PA-34-200T (Seneca II)

## 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: 563 (563 by airframe model, 0 by engine model)
- Makers: Piper 563

Models with the most aircraft:

- [Piper PA-34-200T](https://openairdocs.org/model/piper-pa-34-200t): 563 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/75-25-03/models.md
Every aircraft: https://openairdocs.org/ad/75-25-03/aircraft.md

Its text cites no advisory circulars or STCs.

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