# NTSB ANC25LA027: Pilatus PC-12/45, N304PT, Sleetmute, AK, March 8, 2025

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 3 · Limited · Preliminary report
- Date: March 7, 2025, 17:40 local (Mar 8, 2025, 02:40 UTC)
- Place: Sleetmute, AK
- Coordinates: 61.699624, -157.17343
- Nearby events: https://openairdocs.org/map.md?lat=61.6996&lon=-157.1734&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Defining event: [Enroute: Part(s) separation from AC](https://openairdocs.org/ntsb-events/338)
- Highest injury: No injuries
- Injuries: 10 uninjured
- Status: Investigation ongoing
- Investigation class: Class 3
- NTSB office: Alaska Regional Office
- Parties: FAA
- NTSB case key (mKey): 199893
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC25LA027
- NTSB preliminary report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/199893/pdf
- Page: https://openairdocs.org/ntsb/ANC25LA027

## Preliminary report

On March 7, 2025, about 1740 Alaska standard time, a Pilatus PC-12 airplane, N304PT, sustained substantial damage when it was involved in an accident near Sleetmute, Alaska. The pilot and nine passengers were not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 135 on demand charter flight. The airplane had departed the Scammon Bay Airport (PACM) at 1635 with nine passengers onboard on an instrument flight rules (IFR) flight plan, en route to the Ted Stevens International Airport (PANC), Anchorage, Alaska. After departure the airplane climbed to 27,000 ft and about 1 hour and 23 minutes into the flight the pilot observed and heard the left side of the windscreen crack. The pilot immediately reduced power and began a gradual descent. About a minute later, as the airplane passed through 24,000 ft, the left side windscreen blew completely out of the airplane. See Figure 1 Figure 1. N304PT depicting missing left side windscreen (Photo provided by operator) The pilot diverted to the Sleetmute Airport (PASL) and landed without incident. An examination of the window frame is pending.

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Enroute: Part(s) separation from AC](https://openairdocs.org/ntsb-events/338) (defining event)

## Aircraft

- Registration: [N304PT](https://openairdocs.org/aircraft/N304PT), registered now, S/N 304, built 2000 (OpenAirDocs)
- Reported make and model: PILATUS PC-12/45
- Registry model: [Pilatus PC-12/45](https://openairdocs.org/model/pilatus-pc-12-45) (registry code 7090551) (OpenAirDocs)
- Registry engine: [Pratt & Whitney Canada PT6A-66 series](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-66-series) (registry code 52118, turbo-prop) (OpenAirDocs)
- Category: Airplane
- Serial number: 304
- Year built: 2000
- Damage: Substantial damage
- Flight: Business, Part 135
- Operator: Trygg Holdings, LLC, doing business as Trygg Air
- Registered owner: Trygg Holdings, LLC
- Departed: PACM, Scammon Bay Airport, AK
- Destination: PANC, Anchorage, AK
- Flight plan: IFR
- Airport: SLQ, Sleetmute

## Weather

- Conditions: Instrument (IMC), Day
- Visibility: 10 statute miles
- Lowest ceiling: 6,000 ft overcast
- Temperature: 34 °F, dew point 25 °F
- Altimeter: 29.56 inHg
- Observed at: PANI, 68 nm away
- METAR: PANI 080156Z AUTO VRB05KT 10SM OVC060 01/M04 A2956 RMK AO2 SLP013 T00061039 FZRANO $

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 20250307001849A](https://openairdocs.org/incident/20250307001849A), Mar 7, 2025: Pilatus PC-12/45, Sleetmute, AK, Minor damage. Aircraft was enroute from scammon bay to anchorage. Aircraft was in cruise at 27000 feet. Pilot heard a loud bang and saw that the pilots windshield was…

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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