# AD 59-07-05: Oil Cooler Lines Clearance

- Type: Airworthiness directive
- Status: Current
- Products: Piper PA-24
- Published: June 9, 1959
- Issued: June 3, 1959
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 345 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/58FA6E14055730CC8625698B007654C2.0001
- DRS record last changed: November 21, 2025
- Page: https://openairdocs.org/ad/59-07-05

## The airworthiness directive

59-07-05 PIPER: Applies to PA-24-180 Comanche Aircraft.

Compliance required not later than June 1, 1959.

Inspection has shown the clearance between oil cooler lines and exhaust stack is not adequate on some aircraft. Clearance between the lines and the stack should be a minimum of three-eights of an inch. In the event inadequate clearance exists, the oil cooler lines should be reformed or the fittings in the cooler should be repositioned slightly so that proper clearance can be obtained. If necessary, adapters Piper P/N 451 855 (Weatherhead No. 3200 x 6) can be installed between the oil cooler and the oil cooler line fittings.

When providing for the proper clearance make certain there is no interference between the oil cooler lines and the cowl.

(Piper Service Bulletin No. 167 dated January 6, 1959, covers this item.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 1A15](https://openairdocs.org/tcds/1A15): Piper Aircraft Inc.; names 1 of 4 models: PA-24

## 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: 345 (345 by airframe model, 0 by engine model)
- Makers: Piper 345

Models with the most aircraft:

- [Piper PA-24](https://openairdocs.org/model/piper-pa-24): 345 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/59-07-05/models.md
Every aircraft: https://openairdocs.org/ad/59-07-05/aircraft.md

Its text cites no advisory circulars or STCs.

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