AircraftDirectives
MembershipSign inCreate free account
Menu
Airworthiness Directive

AD 97-23-04 62 FR 59993 Superseded

Federal Aviation Administration · 14 CFR part 39

Requires replacing the fuel tank vent valves with modified fuel tank vent valves.

Superseded by AD 98-11-01Federal Register (opens in a new tab)

FR document
97-29236
Amendment
39-10192
Published
1997-11-06
Effective
1997-12-01
Models covered
1

Last live check: 2026-08-19

Printed from https://aircraftdirectives.com/ad/97-23-04 · AircraftDirectives restates official FAA and manufacturer records; the official sources named on this sheet control. Not an airworthiness determination.

This page is a reference Record, not an airworthiness or compliance determination. Official FAA and manufacturer sources control over our restatement, subject to governing law. Check applicability, current requirements and incorporated documents before acting. The owner or operator remains responsible for airworthiness and required records under 14 CFR 91.403 and 91.417, as applicable. Terms of Use: /terms.

Opens your browser's print dialog. Choose “Save as PDF” to export a file. Keyboard: Ctrl+P or Cmd+P.

AD

97-23-04

FR doc 97-29236 · 62 FR 59993

AD 97-23-04Published 1997-11-06Effective 1997-12-01

Superseded by 98-11-01

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.

Full official abstract

This amendment adopts a new airworthiness directive (AD) that applies to Pilatus Aircraft Ltd. (Pilatus) Models PC-12 and PC-12/45 airplanes. This AD requires replacing the fuel tank vent valves with modified fuel tank vent valves. 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) Search DRS manually for AD 97-23-04 (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