# NTSB ANC12CA021: Beech 99, N991AK, Anchorage, AK, February 1, 2012 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: February 1, 2012, 16:10 local (20:10 UTC) - Place: Anchorage, AK - Coordinates: 61.2, -149.5 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=61.2000&lon=-149.5000&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-flare/touchdown: Landing area undershoot](https://openairdocs.org/ntsb-events/370) - Highest injury: No injuries - Injuries: 7 uninjured - Status: Completed, report August 15, 2012 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - Parties: Federal Aviation Administration - Operations - NTSB case key (mKey): 82806 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC12CA021 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/82806/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=82806 - Page: https://openairdocs.org/ntsb/ANC12CA021 ## Probable cause The pilot's premature power reduction, which resulted in a runway undershoot. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Terrain: snowy/icy terrain](https://openairdocs.org/ntsb-findings/03021030): Environmental issues › Physical environment · Contributed to outcome; cases with it: [All aircraft, 77 cases](https://openairdocs.org/ntsb-findings/03021030/cases.md) - [Action: incorrect action performance](https://openairdocs.org/ntsb-findings/02041015): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [All aircraft, 1,386 cases](https://openairdocs.org/ntsb-findings/02041015/cases.md) - [Performance/control parameters: descent/approach/glide path](https://openairdocs.org/ntsb-findings/01062040): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [All aircraft, 809 cases](https://openairdocs.org/ntsb-findings/01062040/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Landing-flare/touchdown: Landing area undershoot](https://openairdocs.org/ntsb-events/370) (defining event); cases with it: [All aircraft, 201 cases](https://openairdocs.org/ntsb-events/370/sequence.md) - [Landing-flare/touchdown: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The pilot was landing the airplane on a runway surrounded by snow berms. He reported that, as the airplane approached the runway threshold, he reduced engine power to flight idle to descend, and the airplane's main landing gear collided with the snow berm at the approach end of the runway. A postflight inspection revealed substantial damage to the left wheel well bulkhead assembly. The pilot said that there were no preaccident mechanical anomalies with the airplane. ## Factual narrative The pilot was landing a twin-engine turboprop airplane on a runway surrounded by snow berms. The pilot reported that as he approached the runway threshold, he reduced engine power to flight idle to descend, and the airplane's main landing gear collided with the snow berm at the approach end of the runway. A postflight inspection revealed substantial damage to the left wheel well bulkhead assembly. The pilot said that there were no preaccident mechanical anomalies with the airplane. ## Aircraft - Registration: N991AK (not matched to a registry record) - Reported make and model: BEECH 99 - Category: Airplane - Serial number: U-28 - Airframe hours: 36120 - Engines: P/W CANADA PT6 550 horsepower turbo prop; U/A CANADA PT6 SER 578HP 550 horsepower turbo prop - Damage: Substantial damage - Flight: Part 135 - Operator: Lake Clark Air Inc - Registered owner: Lake Clark Air Inc - Airworthiness certificate: Standard, Normal - Last inspection: Condition, December 13, 2011, 44 hours before - Departed: TPO, Port Alsworth, AK - Destination: PAMR, Anchorage, AK - Flight plan: VFR/IFR - Airport: PAMR, Merrill Field, runway 07, 4,000 × 100 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 57; injuries: none; airline transport; airplane ratings: single-engine sea, multi-engine sea, single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; seat: left; flight hours: 30,032 total, 1,320 in this make and model, 29,892 as pilot in command, 208 in the last 90 days, 72 in the last 30 days, 2 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 70° at 4 knots, gusting 16 - Visibility: 1 statute miles - Lowest ceiling: 800 ft broken - Temperature: 27 °F, dew point 21 °F - Altimeter: 28.67 inHg - Observed at: PAMR ## 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 20120201001429A](https://openairdocs.org/incident/20120201001429A), Feb 1, 2012: Beech 99, Anchorage, AK, Substantial damage. The airman was on an IFR flight plan from port alsworth to Merrill Field in Anchorage. There was moderate to severe turbulence in the area due to the chinook… ## Docket (1 files) The files NTSB released with the investigation on June 27, 2012, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=82806. 687 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 687 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40371429&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.