Final NTSB investigations
469 cases where the phase of flight was Emergency descent.
Cases per year
| 1963 | 2 |
|---|---|
| 1964 | 5 |
| 1965 | 4 |
| 1966 | 10 |
| 1967 | 3 |
| 1968 | 6 |
| 1969 | 3 |
| 1970 | 6 |
| 1971 | 3 |
| 1972 | 2 |
| 1973 | 7 |
| 1974 | 4 |
| 1975 | 6 |
| 1976 | 3 |
| 1977 | 4 |
| 1978 | 10 |
| 1979 | 5 |
| 1980 | 4 |
| 1981 | 3 |
| 1982 | 1 |
| 1983 | 2 |
| 1984 | 8 |
| 1985 | 10 |
| 1986 | 11 |
| 1987 | 9 |
| 1988 | 4 |
| 1989 | 3 |
| 1990 | 4 |
| 1991 | 8 |
| 1992 | 4 |
| 1993 | 5 |
| 1994 | 5 |
| 1995 | 3 |
| 1996 | 3 |
| 1997 | 3 |
| 1998 | 8 |
| 1999 | 6 |
| 2000 | 5 |
| 2001 | 5 |
| 2002 | 11 |
| 2003 | 6 |
| 2004 | 5 |
| 2005 | 10 |
| 2006 | 7 |
| 2007 | 2 |
| 2008 | 14 |
| 2009 | 29 |
| 2010 | 16 |
| 2011 | 17 |
| 2012 | 17 |
| 2013 | 16 |
| 2014 | 17 |
| 2015 | 13 |
| 2016 | 13 |
| 2017 | 13 |
| 2018 | 8 |
| 2019 | 3 |
| 2020 | 9 |
| 2021 | 8 |
| 2022 | 7 |
| 2023 | 11 |
| 2024 | 11 |
| 2025 | 6 |
| 2026 | 3 |
Where
Open the mapLatest 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.\"completionStatus\" = 'Completed'
AND c.\"mKey\" IN (SELECT case_mkey FROM case_phases WHERE main = 600)
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."completionStatus" = 'Completed'
AND c."mKey" IN (SELECT case_mkey FROM case_phases WHERE main = 600)
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 ERA26LA327Accident · Serious injuriesClass 4 · LimitedFinal reportRobinson Helicopter R22 Beta · McMinnville, TNThe flight instructor’s delayed remedial action during a practice autorotation, which resulted in a hard landing.NTSB CEN26LA181Accident · No injuriesClass 4 · LimitedFinal reportHughes 369HS · Durango, COThe flight instructor’s inadequate supervision of the pilot receiving the instruction and the pilot’s improper recovery from a practice autorotation in shifting wind conditions, which resulted in a hard landing.NTSB ERA26LA170Accident · No injuriesClass 4 · LimitedFinal reportBell 407 · Jacksonville, FLThe pilot’s improper recovery from a practice autorotation, which resulted in a hard landing. Contributing to the accident was the flight instructor’s inadequate supervision of the pilot receiving the instruction.NTSB ERA26LA026Accident · No injuriesClass 4 · LimitedFinal reportEurocopter AS350 · Wetumpka, ALThe pilot’s improper recovery from a practice autorotation, which resulted in a hard landing. Contributing to the accident was the flight instructor’s inadequate supervision of the pilot receiving instruction.NTSB CEN26LA027Accident · Serious injuriesClass 3 · LimitedFinal reportRobinson Helicopter R22 · Springfield, MOThe pilot’s failure to maintain directional control and the flight instructor’s lack of proper remedial action during the practice autorotation that resulted in the helicopter impacting terrain. Contributing to the accident was the presence of the gusting…NTSB CEN25LA380Accident · Minor injuriesClass 4 · LimitedFinal reportBell 407 · Decatur, TXThe instructor candidate’s erroneous operation of the throttle during an autorotation from altitude with power recovery, which resulted in a hard landing.NTSB CEN25LA381Accident · No injuriesClass 4 · LimitedFinal reportBell Helicopter Textron Canada 505 · Fort Worth, TXThe manufacturer flight instructor’s failure to maintain proper airspeed and a proper descent rate during a demonstrated hover out of ground effect (HOGE) autorotation, which resulted in a hard landing. Contributing to the accident was the manufacturer flight…NTSB WPR25LA189Accident · No injuriesClass 4 · LimitedFinal reportAmerican Eurocopter AS350B3 · San Luis, AZThe pilot receiving instruction’s failure to properly recover the helicopter during an autorotative landing and the instructor pilot’s failure to intervene, which resulted in a hard landing.NTSB WPR25LA101Accident · No injuriesClass 3 · LimitedFinal reportHughes OH-6A · Santa Teresa, NMThe flight instructor's failure to maintain helicopter control during a practice autorotation, which resulted in a hard landing and structural damage to the tail boom and subsequent failure of the tail rotor drive system.NTSB CEN25LA084Accident · No injuriesClass 4 · LimitedFinal reportBell Helicopter Textron Canada 505 · Lago Vista, TXThe flight instructor’s improper recovery from a practice autorotation which resulted in a hard landing.NTSB CEN25LA003Accident · Minor injuriesClass 3 · LimitedFinal reportSchweizer 269C · Montrose, COA loss of engine power during a demonstrated autorotation due to an improperly adjusted air-fuel mixture or idle setting. Contributing to the accident was the pilot’s failure to perform the required idle check during previous flights in higher elevation areas.NTSB CEN24LA377Accident · No injuriesClass 4 · LimitedFinal reportMcdonnell Douglas Helicopter 369E · Manvel, TXThe pilot’s improper recovery from a practice autorotation which resulted in a hard landing. Contributing to the accident was the instructor’s inadequate supervision of the pilot receiving instruction.NTSB ERA24FA365Accident · 2 fatalClass 3 · FieldFinal reportGrumman American Avn. AA-5 · Rockmart, GAA total loss of engine power for undetermined reasons. Also causal was the flight instructor’s failure to maintain adequate airspeed during the forced landing attempt, which resulted in exceedance of the airplane’s critical angle of attack and an aerodynamic…NTSB ENG24LA028Incident · No injuriesClass 3 · LimitedFinal reportBell 407 · Oktaha, OKThe loss of engine power due to high cycle fatigue failure of a power turbine stage 3 turbine wheel blade. The resulting engine imbalance caused a decoupling of the gas producer stage 1 and stage 2 turbine wheels leading to a stage 1 turbine overspeed and…NTSB WPR24LA241Accident · No injuriesClass 3 · LimitedFinal reportRobinson Helicopter R44 II · Herriman, UTA hard landing following a total loss of engine power due to fuel starvation as a result of the improper idle setting of the helicopter’s engine. Contributing to the loss of engine power was the instructor’s reduction of engine power past that recommended by…NTSB ANC24LA045Accident · No injuriesClass 3 · LimitedFinal reportCessna 206 · King Salmon, AKA partial loss of engine power due to detonation/preignition of the No. 1 cylinder for reasons that could not be determined.NTSB WPR24LA183Accident · No injuriesClass 4 · LimitedFinal reportRobinson Helicopter R22 Beta · Maricopa, AZThe flight instructor’s unstabilized approach during an autorotation that resulted in hard landing.NTSB ERA24LA215Accident · No injuriesClass 4 · LimitedFinal reportHughes 369 · Crestview, FLThe pilot’s improper flare, which resulted in a hard landing and the main rotor blades contacting the tail boom.NTSB ERA24LA201Accident · No injuriesClass 4 · LimitedFinal reportStinson 108 · Beach City, OHA total loss of engine power due to the due to the pilot’s delayed application of carburetor heat.NTSB ERA24FA102Accident · 1 fatalClass 3 · FieldFinal reportPiper PA-24 · Eufaula, ALA total loss of engine power due to fuel starvation as a result of the pilot’s inadequate fuel planning/management.NTSB ERA24LA045Accident · No injuriesClass 4 · LimitedFinal reportBell 407 · Chesterfield, VAA hard landing, which resulted in a main rotor strike of the left vertical stablizer.NTSB CEN24LA004Accident · No injuriesClass 3 · LimitedFinal reportRobinson Helicopter R44 · Hochatown, OKA total loss of engine power during a practice autorotation due to the improper engine idle setting and rigging of the carburetor heat control which resulted in a hard landing.NTSB CEN23LA404Accident · No injuriesClass 4 · LimitedFinal reportMcdonnell Douglas Helicopter 369E · Arcola, TXThe instructor’s failure to re-apply engine power during a power recovery after a practice autorotation which resulted in a hard landing.NTSB CEN23LA389Accident · No injuriesClass 4 · LimitedFinal reportMcdonnell Douglas Heli 530FF · Liberty Hill, TXThe pilot’s improper recovery from a practice autorotation resulting in a hard landing. Contributing to the accident was the instructor’s inadequate supervision of the pilot receiving instruction.NTSB WPR23LA295Accident · Serious injuriesClass 3 · LimitedFinal reportFish Larry W Lancair 360 · Renton, WAA loss of electrical power due to low battery voltage, which resulted in an inflight shut down of the capacitor discharge ignition system and a loss of engine power. Contributing to the accident was the pilot’s failure to switch batteries after the electrical…NTSB ERA23LA269Accident · No injuriesClass 4 · LimitedFinal reportBell 206B · Orlando, FLThe pilot’s improper landing flare during a practice autorotation, which resulted in a hard landing.NTSB CEN23LA199Accident · No injuriesClass 4 · LimitedFinal reportBell Helicopter Textron Canada 407 · Abbeville, LAThe pilot’s failure to maintain proper helicopter control during autorotation that resulted in an abnormal ground contact which caused the subsequent main rotor strike on the tail boom that severed the tail rotor driveshaft. Contributing to the accident was…NTSB ANC23LA038Accident · No injuriesClass 4 · LimitedFinal reportAerospatiale AS350B2 · Honolulu, HIThe instructor pilot’s inadequate supervision of the pilot receiving instruction, which resulted in a hard landing, and substantial damage to the tail boom.NTSB WPR23LA191Accident · No injuriesClass 4 · LimitedFinal reportRobinson Helicopter R22 · Spanish Fork, UTThe instructor pilot’s improper landing flare during a straight-in autorotation, which resulted in a hard landing.NTSB CEN23FA164Accident · Serious injuriesClass 3 · FieldFinal reportMaule MXT-7-180 · La Porte, TXThe pilot’s exceedance of the airplane’s critical angle of attack while maneuvering for an emergency landing following a partial loss of engine power, which resulted in an aerodynamic stall/spin and impact with terrain. Contributing to the accident was the…NTSB ERA23LA146Accident · No injuriesClass 4 · LimitedFinal reportHughes 269A · Titusville, FLThe pilot’s failure to maintain adequate main rotor RPM during an autorotation which resulted in a hard landing and subsequent rotor blade strike of the tail boom.NTSB ERA23LA084Accident · No injuriesClass 4 · LimitedFinal reportRobinson Helicopter R22 Beta · Gilgo-Oak Beach-Captree, NYThe flight instructor’s inadequate remedial action while supervising the student pilot’s practice autorotation in gusting wind conditions, which resulted in a dynamic rollover.NTSB CEN23LA048Accident · No injuriesClass 4 · LimitedFinal reportHughes 369HS · Oxford, COThe designated pilot examiner’s failure to maintain a proper descent during a practice 180° autorotation which resulted in a hard landing.NTSB WPR22LA359Accident · Minor injuriesClass 4 · LimitedFinal reportRobinson Helicopter R22 Beta · Mesa, AZThe flight instructor’s failure to maintain control of the helicopter’s rate of descent, resulting in a hard landing.NTSB CEN22LA402Accident · No injuriesClass 3 · LimitedFinal reportMD Helicopters 369E · Pearland, TXThe pilot receiving instruction’s failure to maintain aircraft control, and the flight instructor’s delayed remedial action, which resulted in a hard landing.NTSB CEN22LA400Accident · Serious injuriesClass 4 · LimitedFinal reportRobinson Helicopter R44 II · San Isidro, TXThe pilot’s improper decision to conduct an autorotation with a tailwind, which resulted in a hard landing and substantial damage.NTSB WPR22LA267Accident · Minor injuriesClass 4 · LimitedFinal reportRobinson Helicopter R44 II · Cedar City, UTThe student pilot’s failure to maintain rotor rpm and airspeed and the flight instructor's inadequate remedial action to regain helicopter control during the straight-in autorotation which resulted in a hard landing.NTSB ERA22FA279Accident · 6 fatalClass 1 · FieldFinal reportBell UH-1B · Amherstdale, WVthe operator’s failure to adequately inspect the former military turbine powered helicopter, which allowed an engine issue to progress and result in a loss of engine power and a subsequent loss of control after the helicopter struck powerlines during a forced…NTSB CEN22LA078Accident · Minor injuriesClass 4 · LimitedFinal reportBell Helicopter Textron Canada 407 · Bridgeport, TXThe pilot’s failure to maintain adequate main rotor RPM during an autorotation which resulted in a hard landing. Contributing to the accident was the pilot’s improper placement of the throttle during the initial practice power-on recovery autorotation.NTSB WPR22LA061Accident · 1 fatalClass 3 · LimitedFinal reportMoul Willis RV-3 · Bermuda Dunes, CAThe pilot’s improper positioning of the fuel shutoff valve, which resulted in a loss of engine power, and the pilot’s subsequent exceedance of the airplane’s critical angle of attack, resulting in an aerodynamic stall and loss of control.NTSB ERA22LA016Accident · Serious injuriesClass 3 · LimitedFinal reportKitfox IV · North Canaan, CTThe pilot's mismanagement of the airplane's altitude, airspeed, and course during a forced landing following a partial loss of engine power, which resulted in collision with trees and terrain. Contributing was the pilot’s inadvertent omission of stowing the…NTSB CEN21LA431Accident · No injuriesClass 4 · LimitedFinal reportEurocopter AS350 · Romeo, MIThe flight instructor’s failure to reposition the fuel control to the flight detent during a practice autorotation, which resulted in insufficient engine power to arrest the helicopter’s decent and a hard landing.NTSB WPR21LA313Accident · Serious injuriesClass 3 · LimitedFinal reportCessna 425 · Helena, MTA flameout of both engines due to fuel starvation for reasons that could not be determined due to the airplane’s damage.NTSB WPR21LA299Accident · No injuriesClass 3 · LimitedFinal reportSchweizer G-164B · Tracy, CAA loss of thrust during a low-level agricultural application flight, which resulted in a descent and impact with terrain. The reason for the loss of thrust could not be determined based on available information.NTSB ERA21LA275Accident · Minor injuriesClass 3 · LimitedFinal reportBell 206 · Rome, NYThe pilot's improper termination of a practice autorotation with power recovery, which resulted in low rotor rpm, an unstable landing, and a rollover. Contributing to the accident was the evaluator's inadequate oversight.NTSB WPR21LA109Accident · No injuriesClass 4 · LimitedFinal reportMD Helicopter 369 · Mesa, AZThe pilot’s improper pitch attitude for landing and the inadequate supervision of the flight instructor, resulted in the main rotor blades impacting the tail boom.NTSB ERA20LA309Accident · 3 fatalClass 3 · LimitedFinal reportPiper PA28 · McMinnville, TNA total loss of engine power due to a fatigue failure in a cylinder, and the pilot’s subsequent failure to maintain airspeed and her exceedance of the airplane’s critical angle-of-attack while maneuvering at low altitude.NTSB WPR20CA299Accident · Minor injuriesClass 4 · Data collectionFinal reportCessna 182 · Coeur d'Alene, IDThe pilot's inadequate fuel planning, which resulted in a loss of engine power due to fuel exhaustion and a collision with trees and terrain.NTSB CEN20LA187Accident · No injuriesClass 3 · LimitedFinal reportBell OH-58A · West Branch, MIThe pilot's failure to maintain rotor rpm during a precautionary autorotation, which resulted in a hard landing. Contributing to the accident was the airframe vibration for reasons that could not be determined because examination of the helicopter revealed no…NTSB ERA20CA176Accident · Minor injuriesClass 4 · Data collectionFinal reportCessna 402 · Hampton, GAA dual total loss of engine power as a result of fuel exhaustion.