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Airworthiness Directive

AD 99-17-08 64 FR 45149 Active

Federal Aviation Administration · 14 CFR part 39

FR document
99-21016
Amendment
39-11256
Published
1999-08-19
Effective
1999-10-04
Models covered
1
Last live check
2026-10-01

Printed from https://aircraftdirectives.com/ad/99-17-08 · 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.

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AD

99-17-08

FR doc 99-21016 · 64 FR 45149

AD 99-17-08Published 1999-08-19Effective 1999-10-04

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 modifying the generator 2 excitation by removing certain diodes and installing a new 5-amp circuit breaker and suppression filter.

Full official abstract

This amendment adopts a new airworthiness directive (AD) that applies to certain Pilatus Aircraft Ltd. (Pilatus) Models PC-12 and PC- 12/45 airplanes. This AD requires modifying the generator 2 excitation by removing certain diodes and installing a new 5-amp circuit breaker and suppression filter. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Switzerland. The actions specified by this AD are intended to prevent damage to electrical components if the generator 2 is not switched off prior to engine shutdown and it overheats, which could result in loss of electrical power to certain critical airplane components.

More directives for Pilatus PC-12

  1. AD 2026-15-12 Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes 2026-08-28
  2. AD 2026-15-07 Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes 2026-07-30
  3. AD 2026-12-01 Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes 2026-06-09
  4. AD 2024-08-07 Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes 2024-04-29
  5. AD 2023-12-17 Airworthiness Directives; Pilatus Aircraft Ltd. Airplanes 2023-07-03

All Pilatus PC-12 directives

View on Federal Register (opens in a new tab) Search DRS manually for AD 99-17-08 (opens in a new tab)

Applies to 1 model in our index