# AD 67-25-06: Oil Cooler Hoses

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-31
- Effective: October 27, 1967
- Published: October 25, 1967
- Issued: October 16, 1967
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-469
- Registered aircraft: 26 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/BBF6D39DE4723E3786256E01005463D3.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/67-25-06

## The airworthiness directive

67-25-06 PIPER: Amdt. No. 39-469, Part 39, Federal Register September 1, 1967. Applies to Piper Type PA-31 Aircraft Serial Numbers 31-2 to 31-29 inclusive; 31-31 to 31-38 inclusive; 31-40 to 31-45 inclusive; 31-48, 31-54.

Compliance required as indicated unless already accomplished.

Prior to next flight and every five hours time in service thereafter, until Piper replacement kit P/N 757-167 is installed; inspect oil cooler hoses P/N 41230-09 and P/N 41230-12 on each engine as follows:

  (a) Remove the hoses.

  (b) Cut steel bands which hold fire sleeve on hoses.

  (c) Remove fire sleeve and inspect hoses for broken strands of metal braid, stiffness, or discoloration. If broken strands of metal braid, stiffness, or discoloration are noted replace with new part. If none of the aforementioned defects are noted reinstall fire sleeve on hose using stainless steel safety wire in place of bands and thoroughly clean interior of hoses before reinstalling.

  (d) Hoses must be routed and clamped to provide maximum clearance from all exhaust system parts.

Piper Service Bulletin No. 254 dated August 17, 1967.

Piper Aircraft telegram dated August 4, 1967 and Federal Aviation Administration telegram of August 7, 1967 referencing oil cooler hoses on PA-31 aircraft covers this same subject.

This amendment effective September 1, 1967.

Revised October 27, 1967.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A20SO](https://openairdocs.org/tcds/A20SO): Piper Aircraft Inc.; names 1 of 4 models: PA-31

## 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: 26 (26 by airframe model, 0 by engine model)
- Makers: Piper 26

Models with the most aircraft:

- [Piper PA-31](https://openairdocs.org/model/piper-pa-31): 26 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/67-25-06/models.md
Every aircraft: https://openairdocs.org/ad/67-25-06/aircraft.md

Its text cites no advisory circulars or STCs.

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