# AD 66-01-03: Fuel Valve

- Type: Airworthiness directive
- Status: Current
- Products: Pilatus PC-6, PC-6-H1, PC-6-H2, PC-6/350, PC-6/350-H1, PC-6/350-H2, PC-6/A, PC-6/A-H1 and PC-6/A-H2
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Amendment: 39-173
- Registered aircraft: 1 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/573777BCCDF05F4A86256A45006B2F15.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/66-01-03

## The airworthiness directive

66-01-03 PILATUS: Amdt. 39-173, Part 39, Federal Register December 24, 1965. Applies to Model PC-6 Series Airplanes, Serial Numbers 515, 522, and 524 through 580. Compliance required as indicated, unless already accomplished. To prevent further instances of fuel flow restriction, accomplish the following: (a) Within the next 10 hours' time in service after the effective date of this AD, inspect fuel shutoff valve P/N 321-ITX 6D for correct installation of the valve plug in accordance with Pilatus Service Bulletin No. 36, dated September 1965, or later Swiss Federal Air Office- approved revision. If the valve plug protrudes more than 2mm. (0.078 inch), before further flight, replace the valve with a new valve P/N 6238.124. (b) Within the next 60 hours' time in service after the effective date of this AD, replace fuel shutoff valve P/N 321-ITX 6D with a new valve P/N 6238.124, in accordance with Pilatus Service Bulletin No. 36, dated September 1965, or later Swiss Federal Air Office- approved revision.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS 7A15](https://openairdocs.org/tcds/7A15): Pilatus Aircraft Ltd.; names 9 of 15 models: PC-6/350-H1, PC-6/A-H2, PC-6, PC-6/A-H1, PC-6-H2, PC-6-H1, PC-6/A, PC-6/350-H2…

## 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: 1 (1 by airframe model, 0 by engine model)
- Makers: Pilatus 1

Models with the most aircraft:

- [Pilatus PC-6](https://openairdocs.org/model/pilatus-pc-6): 1 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/66-01-03/models.md
Every aircraft: https://openairdocs.org/ad/66-01-03/aircraft.md

Its text cites no advisory circulars or STCs.

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