# AD 79-26-05: Oil and Fuel System Hoses - Type: Airworthiness directive - Status: Current - Products: Piper PA-28-140, PA-28-150, PA-28-151, PA-28-160, PA-28-161, PA-28-180, PA-28-181, PA-28-201T, PA-28-235, PA-28-236, PA-28R-180, PA-28R-200 and 19 more - Effective: January 3, 1980 - Published: January 3, 1980 - Issued: December 14, 1979 - Superseded by: Nothing supersedes this AD - Product type: Appliance - Amendment: 39-3645 - Registered aircraft: 22,430 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A5A223A03914843C86256A3200489523.0001 - DRS record last changed: November 21, 2025 - Page: https://openairdocs.org/ad/79-26-05 ## The airworthiness directive 79-26-05 AIRCRAFT METAL PRODUCTS CORPORATION: Amendment 39-3645. Applies to all general aviation airplanes with Aircraft Metal Products oil and fuel system hoses P/N 762506 installed. The subject hose is known to be installed on, but not limited to, certain Piper Model PA-28 and PA-32 aircraft. To prevent possible fire or explosion in the engine compartment or engine failure due to loss of engine oil, accomplish the following within 10 hours time in service from the effective date of this AD: (a) Inspect hoses for fluid leakage, excessive abrasion or excessive length. Replace hose if fluid leakage, excessive abrasion or excessive length exists. (b) Loosen each coupling fitting and notice if hose moves in direction of fitting, indicating a pre-existing hose twist. Replace the hose if there is evidence of a pre-existing hose twist. (c) Retighten each coupling fitting, gripping the collar just behind the fitting with pliers with just enough force to keep the hose from turning with the retightened fitting. If the hose turns with the retightened fitting, loosen the coupling fitting and repeat the retightening procedure. (d) Inspect the hose installation for adequate separation between metal hose and other parts of the airplane. If there is contact between metal parts, then complete insulation must be provided using AN742 cushion clamps and/or KOROSEAL lacing or equivalent. (e) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of inspections required by this AD. (f) Alternative inspections, modifications or other actions which provide an equivalent level of safety may be used when approved by the Chief, Aircraft Engineering Division, FAA Western Region. This amendment becomes effective January 3, 1980. ## Affected data sheets (2) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 2A13](https://openairdocs.org/tcds/2A13): Piper Aircraft Inc.; names 18 of 18 models: PA-28R-180, PA-28R-201, PA-28-150, PA-28-201T, PA-28-236, PA-28-140, PA-28R-201T, PA-28S-160… - [TCDS A3SO](https://openairdocs.org/tcds/A3SO): Piper Aircraft Inc.; names 12 of 13 models: PA-32-300, PA-32-301, PA-32-301FT, PA-32R-300, PA-32-260, PA-32-301T, PA-32RT-300, PA-32S-300… ## 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: 22,430 (22,430 by airframe model, 0 by engine model) - Makers: Piper 22,362, New Piper 67, Piper/Valdes-Ervin 1 Models with the most aircraft: - [Piper PA-28-140](https://openairdocs.org/model/piper-pa-28-140): 4,258 aircraft (airframe model) - [Piper PA-28-181](https://openairdocs.org/model/piper-pa-28-181): 3,549 aircraft (airframe model) - [Piper PA-28-180](https://openairdocs.org/model/piper-pa-28-180): 3,504 aircraft (airframe model) - [Piper PA-28-161](https://openairdocs.org/model/piper-pa-28-161): 1,526 aircraft (airframe model) - [Piper PA-28R-200](https://openairdocs.org/model/piper-pa-28r-200): 1,223 aircraft (airframe model) - [Piper PA-32-300](https://openairdocs.org/model/piper-pa-32-300): 992 aircraft (airframe model) - [Piper PA-28-151](https://openairdocs.org/model/piper-pa-28-151): 961 aircraft (airframe model) - [Piper PA-28-235](https://openairdocs.org/model/piper-pa-28-235): 859 aircraft (airframe model) - [Piper PA-32-260](https://openairdocs.org/model/piper-pa-32-260): 650 aircraft (airframe model) - [Piper PA-28R-180](https://openairdocs.org/model/piper-pa-28r-180): 536 aircraft (airframe model) - [Piper PA-32R-301T](https://openairdocs.org/model/piper-pa-32r-301t): 536 aircraft (airframe model) - [Piper PA-32R-300](https://openairdocs.org/model/piper-pa-32r-300): 510 aircraft (airframe model) - [Piper PA-28-236](https://openairdocs.org/model/piper-pa-28-236): 480 aircraft (airframe model) - [Piper PA-32R-301](https://openairdocs.org/model/piper-pa-32r-301): 456 aircraft (airframe model) - [Piper PA-28R-201T](https://openairdocs.org/model/piper-pa-28r-201t): 368 aircraft (airframe model) - [Piper PA-28R-201](https://openairdocs.org/model/piper-pa-28r-201): 352 aircraft (airframe model) - [Piper PA-28RT-201T](https://openairdocs.org/model/piper-pa-28rt-201t): 255 aircraft (airframe model) - [Piper PA-28-160](https://openairdocs.org/model/piper-pa-28-160): 253 aircraft (airframe model) - [Piper PA-32RT-300T](https://openairdocs.org/model/piper-pa-32rt-300t): 204 aircraft (airframe model) - [Piper PA-32RT-300](https://openairdocs.org/model/piper-pa-32rt-300): 200 aircraft (airframe model) All 42 models: https://openairdocs.org/ad/79-26-05/models.md Every aircraft: https://openairdocs.org/ad/79-26-05/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.