# AD 60-10-08: Fuel Selector Valve - Type: Airworthiness directive - Status: Current - Products: Piper PA-18, PA-18-105 (Special), PA-18-125 (Army L-21A), PA-18-135, PA-18-150, PA-18A, PA-18A-135, PA-18A-135 (Restricted), PA-18A-150, PA-18A-150 (Restricted), PA-18A (Restricted), PA-18AS-125 and 21 more - Effective: July 15, 1960 - Published: May 13, 1960 - Issued: May 6, 1960 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Registered aircraft: 6,953 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/99825FEC487208DA8625699900507B11.0001 - DRS record last changed: November 21, 2025 - Page: https://openairdocs.org/ad/60-10-08 ## The airworthiness directive 60-10-08 PIPER: Amdt. 149 Part 507 Federal Register May 13, 1960. Applies to All PA- 22, PA-20, PA-18 Airplanes Equipped With Two Wing Tanks. Compliance required prior to July 15, 1960, and every 100 hours' time in service thereafter. Several accidents have occurred involving engine fuel starvation attributed to a lack of detent action in the fuel selector valve (P/N 11383), causing the pilot to position the selector improperly. If the detent pin in the valve shaft is improperly centered or if the spring retaining washer is installed upside down, the pin will not engage the slotted detent washer. Therefore, the fuel selector valve in the above listed models must be thoroughly cycled to determine whether or not detent engagement is positive. There should be four distinct detents in one complete cycle. If detent engagement is not positive, the valve must be replaced prior to further flight. Also, determine if the position of the fuel valve handle at detent engagement coincides with the proper markings on the indicator plate. If the handle does not coincide with the markings, the plate must be repositioned accordingly. (Piper Service Bulletin No. 141 covers this subject.) ## Affected data sheets (3) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 1A2](https://openairdocs.org/tcds/1A2): Piper Aircraft Inc.; names 13 of 18 models: PA-18-105 (Special), PA-18S-105 (Special), PA-18-125 (Army L-21A), PA-18S-135, PA-18AS-135, PA-18S, PA-18S-150, PA-18… - [TCDS 1A6](https://openairdocs.org/tcds/1A6): Piper Aircraft Inc.; names 8 of 8 models: PA-22S-135, PA-22S-150, PA-22-108, PA-22-160, PA-22-150, PA-22, PA-22S-160, PA-22-135 - [TCDS 1A4](https://openairdocs.org/tcds/1A4): Piper Aircraft Inc.; names 6 of 6 models: PA-20, PA-20S-135, PA-20-135, PA-20S-115, PA-20-115, PA-20S ## 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: 6,953 (6,953 by airframe model, 0 by engine model) - Makers: Piper 6,879, Piper/Cub Crafters 46, Cub Crafters 16, Cubs Unlimited/Piper 1, David B Piper 1, Kurt Lepping 1, Piper-Coley 1, Piper-Root 1, Piper/Gerbi Charles R 1, Piper/Johnson C D 1 Models with the most aircraft: - [Piper PA-18-150](https://openairdocs.org/model/piper-pa-18-150): 2,065 aircraft (airframe model) - [Piper PA-22-150](https://openairdocs.org/model/piper-pa-22-150): 1,200 aircraft (airframe model) - [Piper PA-22-108](https://openairdocs.org/model/piper-pa-22-108): 587 aircraft (airframe model) - [Piper PA-18](https://openairdocs.org/model/piper-pa-18): 477 aircraft (airframe model) - [Piper PA-22-160](https://openairdocs.org/model/piper-pa-22-160): 456 aircraft (airframe model) - [Piper PA-22-135](https://openairdocs.org/model/piper-pa-22-135): 409 aircraft (airframe model) - [Piper PA-18A 150](https://openairdocs.org/model/piper-pa-18a-150): 382 aircraft (airframe model) - [Piper PA-22](https://openairdocs.org/model/piper-pa-22): 277 aircraft (airframe model) - [Piper PA-20](https://openairdocs.org/model/piper-pa-20): 276 aircraft (airframe model) - [Piper PA-18-135](https://openairdocs.org/model/piper-pa-18-135): 220 aircraft (airframe model) - [Piper PA-18A](https://openairdocs.org/model/piper-pa-18a): 152 aircraft (airframe model) - [Piper PA-18-105 SPECIAL](https://openairdocs.org/model/piper-pa-18-105-special): 97 aircraft (airframe model) - [Piper PA-18-125](https://openairdocs.org/model/piper-pa-18-125): 90 aircraft (airframe model) - [Piper PA-18 105](https://openairdocs.org/model/piper-pa-18-105): 57 aircraft (airframe model) - [Piper PA-18A-135](https://openairdocs.org/model/piper-pa-18a-135): 52 aircraft (airframe model) - [Piper/Cub Crafters PA-18-150](https://openairdocs.org/model/piper-cub-crafters-pa-18-150): 46 aircraft (airframe model) - [Piper PA-20-135](https://openairdocs.org/model/piper-pa-20-135): 42 aircraft (airframe model) - [Cub Crafters PA18-150](https://openairdocs.org/model/cub-crafters-pa18-150): 16 aircraft (airframe model) - [Piper PA-22S-150](https://openairdocs.org/model/piper-pa-22s-150): 8 aircraft (airframe model) - [Piper PA-18S-150](https://openairdocs.org/model/piper-pa-18s-150): 6 aircraft (airframe model) All 45 models: https://openairdocs.org/ad/60-10-08/models.md Every aircraft: https://openairdocs.org/ad/60-10-08/aircraft.md Its text cites no advisory circulars or STCs. ## NTSB investigations that cite this AD (2) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB DEN00LA145](https://openairdocs.org/ntsb/DEN00LA145), Aug 6, 2000: Piper PA-22-108 (N4689Z), Duchesne, UT, substantial damage. Probable cause: The pilot's use of excessive braking on soft terrain. Factors included fuel starvation, the fuel selector valve not engaging properly, the pilot's incorrect positioning of the fuel selector valve,… - [NTSB SEA98LA014](https://openairdocs.org/ntsb/SEA98LA014), Nov 15, 1997: Piper PA-18-150 (N1668P), Battle Ground, WA, substantial damage. Probable cause: The owner/pilot's failure to properly install the fuel selector valve after removal, subsequently leading to a false indication on the valve selector handle. This led to the pilot unintentionally… --- 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.