# AD 88-25-08: Engine Cooling System

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-46-310P
- Effective: January 3, 1989
- Published: December 1, 1988
- Issued: November 22, 1988
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-6087
- Registered aircraft: 216 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F02DC8082FA57F53862569A700559AC7.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/88-25-08

## The airworthiness directive

88-25-08 PIPER: Amendment 39-6087. Applies to Model PA-46-310P (all serial numbers) airplanes certificated in any category.

Compliance: Required within the next 50 hours time-in-service after the effective date of this AD, unless already accomplished.

To prevent possible catastrophic engine failure accomplish the following:

  (a) Modify the engine cooling system in accordance with Piper Service Bulletin 892, dated August 24, 1988.

  (b) Airplanes may be flown in accordance with FAR 21.197 to a location where this AD may be accomplished.

  (c) An equivalent means of compliance with this AD, if used, must be approved by the Manager, Atlanta Aircraft Certification Office, ACE-115A, Federal Aviation Administration, 1669 Phoenix Parkway, Suite 210C, Atlanta, Georgia 30349.

This amendment (39-6087, AD 88-25-08) becomes effective on January 3, 1989.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A25SO](https://openairdocs.org/tcds/A25SO): Piper Aircraft Inc.; names 1 of 6 models: PA-46-310P

## 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: 216 (216 by airframe model, 0 by engine model)
- Makers: Piper 215, New Piper 1

Models with the most aircraft:

- [Piper PA-46-310P](https://openairdocs.org/model/piper-pa-46-310p): 215 aircraft (airframe model)
- [New Piper PA-46-310P](https://openairdocs.org/model/new-piper-pa-46-310p): 1 aircraft (airframe model)

All 4 models: https://openairdocs.org/ad/88-25-08/models.md
Every aircraft: https://openairdocs.org/ad/88-25-08/aircraft.md

Its text cites no advisory circulars or STCs.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.