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Airworthiness Directive

AD 98-11-01 63 FR 27195 Superseded

Federal Aviation Administration · 14 CFR part 39

Requires replacing the fuel tank vent valves with modified fuel tank vent valves on certain Pilatus Aircraft Ltd.

Revised by AD 98-11-01 R1Federal Register (opens in a new tab)FAA DRS (opens in a new tab)

FR document
98-13060
Amendment
39-10528
Published
1998-05-18
Effective
1998-06-07
Models covered
1

Last live check: 2026-08-19

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AD

98-11-01

FR doc 98-13060 · 63 FR 27195

AD 98-11-01Published 1998-05-18Effective 1998-06-07

Revised by 98-11-01 R1 Supersedes 97-23-04

Supersedence is read from the Federal Register text of the newer AD — the FAA publishes no structured field for it — and names only ADs held in our index.

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Requires replacing the fuel tank vent valves with modified fuel tank vent valves on certain Pilatus Aircraft Ltd.

Full official abstract

This amendment supersedes Airworthiness Directive (AD) 97-23- 04, which currently requires replacing the fuel tank vent valves with modified fuel tank vent valves on certain Pilatus Aircraft Ltd. (Pilatus) Models PC-12 and PC-12/45 airplanes. This AD retains the fuel tank vent valves replacement required by AD 97-23-04, and requires drilling a 4.8 millimeter (0.1875 inch) hole in each fuel filler cap. This AD also requires inserting a temporary revision in the Pilot's Operating Handbook (POH) that specifies checking to assure that the fuel filler cap hole is clear of ice and foreign objects. This AD is the result of mandatory continued airworthiness information (MCAI) issued by the airworthiness authority for Switzerland. The actions specified by this AD are intended to prevent the fuel tank inward vent valve from freezing, which, if followed by a cold soak at altitude, could result in wing airfoil distortion and structural damage with consequent degradation of the airplane's handling qualities.

More directives for Pilatus PC-12

  1. AD 2026-15-12 Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes Effective 2026-10-02
  2. AD 2026-15-07 Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes Effective 2026-09-03
  3. AD 2026-12-01 Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes Effective 2026-07-14
  4. AD 2026-08-11 Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes Effective 2026-05-11
  5. AD 2024-08-07 Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes Effective 2024-06-03

All Pilatus PC-12 directives

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)

Applies to 1 model in our index