NTSB investigations, MI
175 cases where the phase of flight was Taxi.
Cases per year
| 1964 | 12 |
|---|---|
| 1965 | 9 |
| 1966 | 8 |
| 1967 | 8 |
| 1968 | 9 |
| 1969 | 5 |
| 1970 | 5 |
| 1971 | 7 |
| 1972 | 9 |
| 1973 | 10 |
| 1974 | 2 |
| 1975 | 5 |
| 1976 | 5 |
| 1977 | 5 |
| 1978 | 6 |
| 1979 | 4 |
| 1980 | 4 |
| 1981 | 4 |
| 1982 | 5 |
| 1983 | 2 |
| 1984 | 2 |
| 1985 | 4 |
| 1986 | 2 |
| 1987 | 4 |
| 1988 | 3 |
| 1990 | 3 |
| 1991 | 3 |
| 1992 | 1 |
| 1993 | 2 |
| 1994 | 2 |
| 1995 | 1 |
| 1996 | 1 |
| 1998 | 2 |
| 1999 | 1 |
| 2000 | 1 |
| 2003 | 1 |
| 2005 | 1 |
| 2006 | 2 |
| 2008 | 3 |
| 2013 | 3 |
| 2016 | 1 |
| 2019 | 1 |
| 2020 | 1 |
| 2021 | 3 |
| 2023 | 2 |
| 2026 | 1 |
Where
Latest cases
Query with SQL
duckdb -csv -c "WITH phase_names(main, name) AS (VALUES (100, 'Prior to flight'), (150, 'Standing'), (200, 'Pushback/towing'), (250, 'Taxi'), (300, 'Takeoff'), (350, 'Initial climb'), (400, 'Enroute'), (450, 'Maneuvering'), (500, 'Approach'), (550, 'Landing'), (600, 'Emergency descent'), (650, 'Uncontrolled descent'), (700, 'Post-impact'), (750, 'After landing'), (800, 'Other'), (990, 'Unknown')),
crosswalk(code, main, name) AS (VALUES (500, 150, 'Standing'), (501, 150, 'Standing - pre-flight'), (502, 150, 'Standing - starting engine(s)'), (503, 150, 'Standing - engine(s) operating'), (504, 150, 'Standing - engine(s) not operating'), (505, 150, 'Standing - idling rotors'), (510, 250, 'Taxi'), (511, 200, 'Taxi - pushback/tow'), (512, 250, 'Taxi - to takeoff'), (513, 250, 'Taxi - from landing'), (514, 250, 'Taxi - aerial'), (520, 300, 'Takeoff'), (521, 300, 'Takeoff - roll/run'), (522, 350, 'Takeoff - initial climb'), (523, 300, 'Takeoff - aborted'), (530, 400, 'Climb'), (531, 400, 'Climb - to cruise'), (540, 400, 'Cruise'), (541, 400, 'Cruise - normal'), (542, 400, 'Maneuvering - holding (IFR)'), (550, 400, 'Descent'), (551, 400, 'Descent - normal'), (552, 600, 'Descent - emergency'), (553, 650, 'Descent - uncontrolled'), (560, 500, 'Approach'), (561, 500, 'Approach - VFR pattern - downwind'), (562, 500, 'Approach - VFR pattern - base turn'), (563, 500, 'Approach - VFR pattern - base leg/base to final'), (564, 500, 'Approach - VFR pattern - final approach'), (565, 500, 'Go-around (VFR)'), (566, 500, 'Approach - IAF to FAF/outer marker (IFR)'), (567, 500, 'Approach - FAF/outer marker to threshold (IFR)'), (568, 500, 'Circling (IFR)'), (569, 500, 'Missed approach (IFR)'), (570, 550, 'Landing'), (571, 550, 'Landing - flare/touchdown'), (572, 550, 'Landing - roll'), (573, 550, 'Landing - aborted'), (574, 550, 'Emergency landing'), (575, 550, 'Emergency landing after takeoff'), (576, 600, 'Emergency descent/landing'), (580, 450, 'Maneuvering'), (581, 450, 'Maneuvering - aerial application'), (582, 450, 'Maneuvering - turn to reverse direction'), (583, 450, 'Maneuvering - turn to landing area (emergency)'), (590, 450, 'Hover'), (591, 450, 'Hover - in ground effect'), (592, 450, 'Hover - out of ground effect'), (600, 800, 'Other'), (610, 990, 'Unknown')),
current_codes AS (
SELECT e.case_mkey, TRY_CAST(e.\"tier1Number\" AS INTEGER) AS code,
row_number() OVER (PARTITION BY e.case_mkey ORDER BY coalesce(e.\"isDefiningEvent\", false) DESC, e.position) AS n
FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' e
WHERE e.aircrafts_position = 1 AND e.\"tier1Number\" GLOB '[1-9][0-9]*'
AND (e.\"isDefiningEvent\" OR e.case_mkey IN (SELECT \"mKey\" FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' WHERE \"isPre1982\"))
),
phases AS (
SELECT case_mkey, 'current' AS scheme, code, CASE WHEN code >= 990 THEN 990 ELSE code // 50 * 50 END AS main
FROM current_codes WHERE n = 1
UNION ALL
SELECT o.case_mkey, 'older', o.\"phaseOfFlightCode\", w.main
FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o JOIN crosswalk w ON w.code = o.\"phaseOfFlightCode\"
WHERE o.aircrafts_position = 1 AND o.\"occurrenceNumber\" = 1 AND o.case_mkey NOT IN (SELECT case_mkey FROM current_codes)
),
case_phases AS (
SELECT p.*, c.\"eventDate\", c.\"highestInjuryLevel\" = 'Fatal' AS fatal, a.aircraft_model_code
FROM phases p JOIN 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c ON c.\"mKey\" = p.case_mkey
LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = p.case_mkey AND a.position = 1
WHERE c.\"eventDate\" >= DATE '1962-01-01' AND p.main IN (SELECT main FROM phase_names)
)
SELECT c.\"ntsbNumber\", c.\"eventDate\", c.\"eventType\", c.\"eventCity\", c.\"eventStateOrRegion\", a.n_number, a.\"aircraftMake\", a.\"aircraftModel\", c.\"highestInjuryLevel\", c.\"totalFatal\", c.\"completionStatus\", c.report_url
FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = c.\"mKey\" AND a.position = 1
WHERE c.\"eventStateOrRegion\" = 'MI' AND c.\"eventCountry\" = 'USA'
AND c.\"mKey\" IN (SELECT case_mkey FROM case_phases WHERE main = 250)
ORDER BY c.\"eventDate\" DESC, c.\"ntsbNumber\" DESC"Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.
WITH phase_names(main, name) AS (VALUES (100, 'Prior to flight'), (150, 'Standing'), (200, 'Pushback/towing'), (250, 'Taxi'), (300, 'Takeoff'), (350, 'Initial climb'), (400, 'Enroute'), (450, 'Maneuvering'), (500, 'Approach'), (550, 'Landing'), (600, 'Emergency descent'), (650, 'Uncontrolled descent'), (700, 'Post-impact'), (750, 'After landing'), (800, 'Other'), (990, 'Unknown')),
crosswalk(code, main, name) AS (VALUES (500, 150, 'Standing'), (501, 150, 'Standing - pre-flight'), (502, 150, 'Standing - starting engine(s)'), (503, 150, 'Standing - engine(s) operating'), (504, 150, 'Standing - engine(s) not operating'), (505, 150, 'Standing - idling rotors'), (510, 250, 'Taxi'), (511, 200, 'Taxi - pushback/tow'), (512, 250, 'Taxi - to takeoff'), (513, 250, 'Taxi - from landing'), (514, 250, 'Taxi - aerial'), (520, 300, 'Takeoff'), (521, 300, 'Takeoff - roll/run'), (522, 350, 'Takeoff - initial climb'), (523, 300, 'Takeoff - aborted'), (530, 400, 'Climb'), (531, 400, 'Climb - to cruise'), (540, 400, 'Cruise'), (541, 400, 'Cruise - normal'), (542, 400, 'Maneuvering - holding (IFR)'), (550, 400, 'Descent'), (551, 400, 'Descent - normal'), (552, 600, 'Descent - emergency'), (553, 650, 'Descent - uncontrolled'), (560, 500, 'Approach'), (561, 500, 'Approach - VFR pattern - downwind'), (562, 500, 'Approach - VFR pattern - base turn'), (563, 500, 'Approach - VFR pattern - base leg/base to final'), (564, 500, 'Approach - VFR pattern - final approach'), (565, 500, 'Go-around (VFR)'), (566, 500, 'Approach - IAF to FAF/outer marker (IFR)'), (567, 500, 'Approach - FAF/outer marker to threshold (IFR)'), (568, 500, 'Circling (IFR)'), (569, 500, 'Missed approach (IFR)'), (570, 550, 'Landing'), (571, 550, 'Landing - flare/touchdown'), (572, 550, 'Landing - roll'), (573, 550, 'Landing - aborted'), (574, 550, 'Emergency landing'), (575, 550, 'Emergency landing after takeoff'), (576, 600, 'Emergency descent/landing'), (580, 450, 'Maneuvering'), (581, 450, 'Maneuvering - aerial application'), (582, 450, 'Maneuvering - turn to reverse direction'), (583, 450, 'Maneuvering - turn to landing area (emergency)'), (590, 450, 'Hover'), (591, 450, 'Hover - in ground effect'), (592, 450, 'Hover - out of ground effect'), (600, 800, 'Other'), (610, 990, 'Unknown')),
current_codes AS (
SELECT e.case_mkey, TRY_CAST(e."tier1Number" AS INTEGER) AS code,
row_number() OVER (PARTITION BY e.case_mkey ORDER BY coalesce(e."isDefiningEvent", false) DESC, e.position) AS n
FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' e
WHERE e.aircrafts_position = 1 AND e."tier1Number" GLOB '[1-9][0-9]*'
AND (e."isDefiningEvent" OR e.case_mkey IN (SELECT "mKey" FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' WHERE "isPre1982"))
),
phases AS (
SELECT case_mkey, 'current' AS scheme, code, CASE WHEN code >= 990 THEN 990 ELSE code // 50 * 50 END AS main
FROM current_codes WHERE n = 1
UNION ALL
SELECT o.case_mkey, 'older', o."phaseOfFlightCode", w.main
FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o JOIN crosswalk w ON w.code = o."phaseOfFlightCode"
WHERE o.aircrafts_position = 1 AND o."occurrenceNumber" = 1 AND o.case_mkey NOT IN (SELECT case_mkey FROM current_codes)
),
case_phases AS (
SELECT p.*, c."eventDate", c."highestInjuryLevel" = 'Fatal' AS fatal, a.aircraft_model_code
FROM phases p JOIN 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c ON c."mKey" = p.case_mkey
LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = p.case_mkey AND a.position = 1
WHERE c."eventDate" >= DATE '1962-01-01' AND p.main IN (SELECT main FROM phase_names)
)
SELECT c."ntsbNumber", c."eventDate", c."eventType", c."eventCity", c."eventStateOrRegion", a.n_number, a."aircraftMake", a."aircraftModel", c."highestInjuryLevel", c."totalFatal", c."completionStatus", c.report_url
FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = c."mKey" AND a.position = 1
WHERE c."eventStateOrRegion" = 'MI' AND c."eventCountry" = 'USA'
AND c."mKey" IN (SELECT case_mkey FROM case_phases WHERE main = 250)
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESCRun it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.
NTSB CEN26LA216Accident · No injuriesClass 4 · LimitedFinal reportCessna 182P · Northport, MIThe pilot's decision to resume taxiing on a turf runway that was unable to adequately support the airplane's weight, which resulted in the nose landing gear sinking into the soft ground and the propeller striking the terrain.NTSB CEN24LA014Accident · No injuriesClass 3 · LimitedFinal reportCirrus SR22 · Saginaw, MIThe failure of the right brake assembly due to excessive brake lining wear, which resulted in a thermally damaged piston O-ring, hydraulic fluid leak, and subsequent fire.NTSB CEN23LA165Accident · No injuriesClass 3 · LimitedFinal reportPipistrel Lsa Sinus · Kingsford, MIThe failure of maintenance personnel to properly secure the left carburetor bowl cover, which resulted in an engine fire before takeoff.NTSB CEN21LA422Accident · No injuriesClass 4 · LimitedFinal reportCessna 195 · Ypsilanti, MIThe pilot’s failure to maintain directional control during taxi, which resulted in a ground loop.NTSB CEN21LA388Accident · Minor injuriesClass 3 · LimitedFinal reportCessna 172 · Iron Mountain, MIThe mechanics’ failure to follow procedures for high-thrust operations at the nontowered airport, which resulted in jet blast damage to an airplane taxiing nearby.NTSB DCA21LA184Accident · Serious injuriesClass 4 · LimitedFinal reportAirbus A321-211 · Romulus, MIWhile conducting the safety briefing, the forward flight attendant was thrown backwards into the flight deck door due to the sudden stopping of the airplane by the flight crew to prevent a collision with a bus. Contributing to this accident was the bus…NTSB CEN20CA358Accident · Minor injuriesClass 4 · Data collectionFinal reportChampion 8GCBC · Three Rivers, MIThe pilot's failure to maintain clearance from a taxiway sign after landing.NTSB CEN20CA027Accident · No injuriesData collectionFinal reportSkystar Kitfox · Williamston, MIThe pilot's improper decision to continue taxiing the airplane on unsuitable terrain, which resulted in a nose-over.NTSB DCA16CA094Accident · No injuriesData collectionFinal reportBoeing 737 · Detroit, MIN925NN flight crew's incorrect evaluation of the clearance between the two aircraft, leading to the inadvertent collision of the winglet with the horizontal stabilizer and elevator of N784SW.NTSB CEN13LA365Accident · No injuriesLimited investigationFinal reportPiper PA-32-301T · Lansing, MIThe pilot’s failure to follow the airplane checklist, which resulted in the parking brake not being released before taxi and a subsequent brake fire.NTSB CEN13CA202Accident · No injuriesData collectionFinal reportCessna 172L · Pontiac, MIThe pilot's failure to maintain airplane control after an unexplained increase in engine power while taxiing.NTSB CEN13CA185Accident · Minor injuriesData collectionFinal reportPiper PA22 · Baraga, MIThe pilot’s failure to maintain directional control during taxi.NTSB DCA09FA011Accident · Minor injuriesField investigationFinal reportBombardier CL-600-2B19 · Detroit, MIThe lack of vigilance on the part of the ramp agent driving the baggage tug. Contributing factors include the night conditions, and low visibility due to fog and rain.NTSB CHI08CA271Accident · No injuriesData collectionFinal reportCessna T182T · Munising, MIThe inadequate preflight planning/preparation by the pilot to carry a hazardous material aboard an airplane that resulted in a fire during an after-landing taxi.NTSB CHI08CA298Accident · No injuriesData collectionFinal reportLake LA-4 · Algonac, MIThe amphibious airplane's collision with submerged debris during taxi for takeoff, and the resulting damage to the hull.NTSB CHI07CA033Accident · No injuriesData collectionFinal reportCessna C-425 · Menominee, MIThe pilot failed to maintain control of the aircraft while parking the aircraft, and failed to maintain clearance from the building as the airplane taxied forward. A factor was the terminal.NTSB CHI06CA279Accident · No injuriesData collectionFinal reportMeyers MAC-145 · Manistique, MIThe pilot not verifying the landing gear selector position prior to starting the taxi.NTSB CHI05CA090Accident · No injuriesData collectionFinal reportCessna 172R · Kalamazoo, MIThe pilot's failure to maintain directional control and the excessive taxispeed.NTSB CHI03LA084Accident · No injuriesLimited investigationFinal reportBell 430 · Highland, MIThe pilot's failure to maintain clearance to the roadway sign. Contributing factors were the failure of the tail rotor gearbox, the roadway sign and the low lighting conditions (night).NTSB CHI00LA158Accident · No injuriesLimited investigationFinal reportTruthan Searey · Grand Rapids, MIthe pilot's failure to maintain aircraft control when the airplane encountered high winds. Factors which related to this accident were the high crosswind, the wind gusts, and the submerged object.NTSB CHI99LA107Accident · No injuriesLimited investigationFinal reportPiper J4A · Howell, MIthe pilot's failure to maintain clearance with the snow covered terrain off the side of the runway while turning the airplane around on the runway. A factor associated with the accident was the snow covered terrain.NTSB CHI99LA038Accident · No injuriesLimited investigationFinal reportPiper PA-28R-200 · Hancock, MIthe pilot became disoriented while taxiing at an unfamiliar airport and his failure to reduce engine power when the airplane departed the paved surface. Factors associated with the accident were the dark night condition, the pilot did not follow the correct…NTSB CHI98LA330Accident · No injuriesLimited investigationFinal reportPiper PA-32-260 · Sault Ste Marie, MIthe pilot's failure to maintain clearance between the airplane and the runway marker. A factor contributing to this accident was the runway marker.NTSB CHI96LA081Accident · No injuriesLimited investigationFinal reportBeech 58 · Yipsilanti, MIwas the pilot not maintaining visual separation with the parked airplanes. A factor in this accident was the pilot's over- confidence in his personal ability to taxi onto the parking ramp with the snowfall he was encountering.NTSB CHI96LA058Accident · No injuriesLimited investigationFinal reportCessna 150B · Grant, MIthe pilot's selection of unsuitable terrain and the weak ice-covered runway.NTSB CHI94FA262Accident · 1 fatalField investigationFinal reportGrumman HU-16 · St. Ignace, MIThe pilot's failure to follow good seaplane operating practices by taxiing with power at forward thrust, with a tailwind, at a speed that necessitated using reverse thrust to arrest the excessive speed, and the pilot's misjudgment of his distance from the…NTSB CHI94LA086Accident · No injuriesLimited investigationFinal reportAeronca 7AC · Dowagiac, MIFailure of the pilot to maintain directional control, which resulted in an inadvertent ground swerve. Factors related to the accident were: the pilot's lack of experience in this make and model of aircraft, the crosswind, and snow beside the runway.NTSB CHI93LA336Accident · No injuriesLimited investigationFinal reportCessna 172M · Adrian, MIan excessive taxi speed used by the pilot-in-command. A factor related to the accident was loose gravel on the ramp and inadequate airport maintenance by the airport personnel.NTSB CHI93LA102Accident · No injuriesLimited investigationFinal reportCessna 172 · Manistique, MIAn excessive taxi speed.NTSB CHI92LA164Accident · Serious injuriesLimited investigationFinal reportGrumman AA5B · Charlotte, MIThe pedestrian's failure to maintain visual outlook and separation from the taxiing aircraft.NTSB CHI92LA006Accident · No injuriesLimited investigationFinal reportCessna 421B · Battle Creek, MIThe total failure of the right main landing gear's downlock link assembly.NTSB CHI91LA179Accident · No injuriesLimited investigationFinal reportLake LA-4-200 · Battle Creek, MIAircraft control by the dual student was not maintained, remedial action by the CFI was delayed, which resulted in a stall/mush. A factor related to the accident was rough water caused by a power boat wake.NTSB CHI91LA132Accident · No injuriesLimited investigationFinal reportLuscombe 8A · Fibre, MIThe pilot attempting to taxi on unsuitable terrain.NTSB DCA91MA010Accident · 8 fatalClass 1 · MajorFinal reportMcdonnell Douglas DC-9-14 · Romulus, MILack of proper crew coordn, including virtual reversal of roles by the DC-9 plts, which led to their failure to stop taxiing & alert gnd ctlr of their positional uncertainty in a timely manner bfr & after intruding onto the active rwy. Contribuing to cause of…NTSB CHI90FA278Accident · Serious injuriesField investigationFinal reportBoeing 727-251 · Detroit, MIThe intentional activation of the auxillary power unit by the flight engineer, and the improper evacuation procedures by the pilot in command. An associated factor in the accident was the APU circuit breakers were not pulled by company maintenance personnel.NTSB CHI90LA085Accident · No injuriesLimited investigationFinal reportPiper PA-28-161 · Pontiac, MIOverload failure of the left main landing gear attach bolts for an undetermined reason.NTSB CHI88LA112Accident · No injuriesLimited investigationFinal reportPiper PA-28-140 · Sault Ste Marie, MIDuring taxi for take-off, the student pilot attempted to apply brakes as he neared the end of the runway. As the aircraft veered to the left, he noted that his right foot was not on the brake pedal. The aircraft left the taxiway and struck a fire hydrant,…NTSB CHI88IA088Incident · Minor injuriesIncident investigationFinal reportBoeing 727-251 · Detroit, MINTSB CHI88LA063Accident · No injuriesLimited investigationFinal reportCessna 152 · Lansing, MIWhile taxiing for takeoff the aircraft experienced a nose over when it contacted a snowbank. The instructor stated that she allowed the student pilot to taxi too fast and was unable to take control of the aircraft soon enough to avoid hitting the snowbank.NTSB CHI87LA184Accident · No injuriesLimited investigationFinal reportCessna 172Q · Belleville, MIAlthough the plt saw a dark wx area apch the arpt he elected to shoot a touch and go before terminating the flt. After touchdown and during taxi twr advised wind was 270 degrees at 40 KTS. The pilot continued taxi to the south and the wind nosed the acft down.NTSB CHI87LA174Accident · No injuriesLimited investigationFinal reportCessna 172N · Troy, MIThe plt lndd at ngt & taxied the acft to a hangar area for a passenger stop. After the passenger deplaned, the plt proceeded to make a u-turn around a t-hangar & onto an automobile service road that wasn't normally used for acft. Whilethe plt was attempting…NTSB CHI87LA118Accident · No injuriesLimited investigationFinal reportPiper J3C · Midland, MIWhile taxiing to runway 24 run up area the aircraft flipped over onto its nose. The pilot stated a gust of wind caught the plane from behind. Winds at the tri-city airport, 12 miles southeast of Midland, were reported from 130 degrees at 6 knots.NTSB CHI87LA089Accident · No injuriesLimited investigationFinal reportCessna 182F · Pontiac, MIWhile the acft was being taxied to a hangar after landing, the left main gear collapsed. An investigation revealed the left main landing gear spring strut, pn 0741601-1, had failed where it was clamped to the fuselage. A metallurgical exam of the fracture…NTSB CHI87LA025Accident · No injuriesLimited investigationFinal reportPiper PA-34-220T · Detroit, MIUpon landing at Detroit metropolitan airport, the pilot stated that he was instructed by the tower to make a right turn on runway 3C or taxiway j, and taxi to butler aviation. The pilot then turned onto what he thought was taxiway j, but was actually a paved…NTSB CHI86IA121Incident · No injuriesIncident investigationFinal reportBoeing 727-231 · Detroit, MIWhile taxiing for takeoff a male pax panicked and shouted 'open the door!' During a smoke-in-the-cabin occurrence (overheated a/c pack). The lead fa mistook this 'instruction' as coming from the cockpit and opened an exit door. Passengers interpreted her…NTSB CHI86IA037Incident · No injuriesIncident investigationFinal reportEmbraer EMB-110P1 · Detroit, MIThe acft suffered a failure of the left rear axle during taxi to takeoff.NTSB CHI85LA232Accident · No injuriesLimited investigationFinal reportPiper J-3 · Gaylord, MIThe plt attempt to take the float plane across a lake in wind that was from 270 deg at 20 gusting 40 KTS. Subsequently, the acft capsized & was damaged. In a revised statement, the plt reported that he was 'sailing' (letting the wind blow the acft) across the…NTSB CHI85LA098Accident · No injuriesLimited investigationFinal reportCessna 140A · Three Rivers, MIThe ski equipped aircraft was taxiing on the frozen surface of the lake when the two bottom bolts that attached the right ski to the gear leg failed the overload failed the two top bolts and the ski failed out and up at a forty five degree angle this…NTSB CHI85LA089Accident · No injuriesLimited investigationFinal reportBeech 58P · Grand Rapids, MIAt 1215 EST, a ground vehicle operator (S-1) rprtd that the braking action was poor on the rwys & taxiways (twys). In the next 9 min, 5 snow plows were cleared onto twys a & e. a short time later, the plt of N58PC was cleared to taxi fm the general aviation…NTSB CHI84LA220Accident · No injuriesLimited investigationFinal reportLeblanc Dragon FLY · Lansing, MIThe acft inadvertently became airborne on a high speed taxi test. The plt lowered the nose resulting in a porpoise & thecanard was damaged. The acft had not been inspected or certified by the FAA. Examination revealed that the right wing had a higher angle of…