# NTSB CHI04LA042: Beech 99, N399CZ, Mosinee, WI, December 16, 2003 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: December 16, 2003, 07:30 local (13:30 UTC) - Place: Mosinee, WI - Coordinates: 44.7775, -89.666664 - Nearby events: https://openairdocs.org/map.md?lat=44.7775&lon=-89.6667&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report July 29, 2004 - Report: Approved by Office Director - Parties: Federal Aviation Administration - NTSB case key (mKey): 58495 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI04LA042 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/58495/pdf - Page: https://openairdocs.org/ntsb/CHI04LA042 ## Probable cause The pilot's failure to maintain the proper descent rate and his inadequate flare. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Hard landing, landing - proper descent rate - not maintained, pilot in command (cause) - weather condition - tailwind - flare - inadequate, pilot in command (cause) - missed approach - not performed, pilot in command - in-flight planning/decision - inadequate, pilot in command ## Analysis The airplane sustained substantial damage during a hard landing. The pilot stated, "On approach to rwy 8 at [Central Wisconsin Airport] I got high [and] right of course. When I broke out of clouds around 1000 [feet above ground level] I saw the runway, realizing I was high I pulled the power back [and] increased my rate of descent. I started to arrest my rate of descent [and] add power to keep my speed up. The engines didn't spool up in time resulting in a hard [landing]. I noticed the right wing was a little low taxing in so I thought maybe I blew a tire on landing. Not until I shut down [and] got out did I realize I hit the prop about an inch back [and] the engine nacelle dropped down several inches in front." The weather was: Wind 330 degrees at 8 knots; visibility 4 statute miles; present weather light snow; sky condition overcast 300 feet; temperature 1 degree C; dew point -1 degree C; altimeter 29.41 inches of mercury. The pilot reported that the flight did not have any mechanical malfunctions. ## Factual narrative On December 16, 2003, about 0730 central standard time, a Beech 99, N399CZ, operated as Freight Runners Express flight 1544 from Milwaukee, Wisconsin, to Mosinee, Wisconsin, sustained substantial damage during a hard landing on runway 8 (7,645 feet by 150 feet, concrete) at Central Wisconsin Airport (CWA), near Mosinee, Wisconsin. The 14 CFR Part 135 non-scheduled domestic cargo flight was operating on an instrument flight rules (IFR) flight plan. Instrument meteorological conditions prevailed at the time of the accident. The airline transport pilot reported no injuries. The flight originated from General Mitchell International Airport, near Milwaukee, Wisconsin, about 0630 and was landing at CWA at the time of the accident. The pilot stated: On approach to rwy 8 at CWA I got high [and] right of course. When I broke out of clouds around 1000 [feet above ground level] I saw the runway, realizing I was high I pulled the power back [and] increased my rate of descent. I started to arrest my rate of descent [and] add power to keep my speed up. The engines didn't spool up in time resulting in a hard [landing]. I noticed the right wing was a little low taxing in so I thought maybe I blew a tire on landing. Not until I shut down [and] got out did I realize I hit the prop about an inch back [and] the engine nacelle dropped down several inches in front. The pilot reported that the flight did not have any mechanical malfunctions. At 0645, the CWA recorded weather was: Wind 330 degrees at 8 knots; visibility 4 statute miles; present weather light snow; sky condition overcast 300 feet; temperature 1 degree C; dew point -1 degree C; altimeter 29.41 inches of mercury. At 0755, the CWA recorded weather was: Wind 330 degrees at 15 knots gusting to 20 knots; visibility 4 statute miles; present weather light snow; sky condition broken 1,200 feet, overcast 2,500 feet; temperature -2 degrees C; dew point -4 degrees C; altimeter 29.44 inches of mercury. ## Aircraft - Registration: [N399CZ](https://openairdocs.org/deregistered/N399CZ-2004-08-20), registration cancelled 2004-08-20, S/N U52, built 1969 (OpenAirDocs) - Reported make and model: Beech 99 - Registry model: [Beech 99](https://openairdocs.org/model/beech-99) (registry code 1154002) (OpenAirDocs) - Registry engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) (OpenAirDocs) - Category: Airplane - Serial number: U52 - Airframe hours: 35914.7 - Engines: Pratt & Whitney PT6A-27 680 horsepower turbo prop; Pratt & Whitney PT6A-27 680 horsepower turbo prop - Damage: Substantial damage - Flight: Part 135 - Operator: Freight Runners Express Inc - Registered owner: Freight Runners Express Inc - Airworthiness certificate: Standard, Normal - Last inspection: AAIP, December 9, 2003, 8.1 hours before - Departed: MKE, MILWAUKEE, WI - Destination: CWA, Mosinee, WI - Flight plan: IFR - Airport: CWA, Central Wisconsin, runway 8, 7,645 × 150 ft, concrete ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 39; injuries: none; flight instructor, flight engineer, airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; last flight review November 10, 2003; seat: left; flight hours: 9,000 total, 55 in this make and model, 8,000 as pilot in command, 70 in the last 90 days, 55 in the last 30 days, 4 in the last 24 hours ## Weather - Conditions: Instrument (IMC), Day - Wind: 330° at 8 knots - Visibility: 4 statute miles - Lowest ceiling: 300 ft overcast - Temperature: 34 °F, dew point 30 °F - Altimeter: 29.40 inHg - Observed at: CWA ## 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 20031216035399A](https://openairdocs.org/incident/20031216035399A), Dec 16, 2003: Beech 99, Mosinee, WI, Destroyed. (-23) Pilot felt dme/loc equipment in aircraft was intermittently inaccurate. Commenced approach without being in stable position. Pilot felt nav indications… 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.