Final NTSB investigations
18,259 cases where the phase of flight was Maneuvering.
Cases per year
| 1964 | 415 |
|---|---|
| 1965 | 419 |
| 1966 | 366 |
| 1967 | 410 |
| 1968 | 394 |
| 1969 | 360 |
| 1970 | 330 |
| 1971 | 384 |
| 1972 | 359 |
| 1973 | 407 |
| 1974 | 410 |
| 1975 | 407 |
| 1976 | 480 |
| 1977 | 443 |
| 1978 | 433 |
| 1979 | 384 |
| 1980 | 377 |
| 1981 | 374 |
| 1982 | 416 |
| 1983 | 476 |
| 1984 | 462 |
| 1985 | 402 |
| 1986 | 357 |
| 1987 | 357 |
| 1988 | 349 |
| 1989 | 313 |
| 1990 | 307 |
| 1991 | 350 |
| 1992 | 309 |
| 1993 | 315 |
| 1994 | 322 |
| 1995 | 320 |
| 1996 | 279 |
| 1997 | 262 |
| 1998 | 259 |
| 1999 | 267 |
| 2000 | 281 |
| 2001 | 257 |
| 2002 | 241 |
| 2003 | 263 |
| 2004 | 224 |
| 2005 | 212 |
| 2006 | 203 |
| 2007 | 222 |
| 2008 | 231 |
| 2009 | 200 |
| 2010 | 213 |
| 2011 | 232 |
| 2012 | 218 |
| 2013 | 196 |
| 2014 | 180 |
| 2015 | 176 |
| 2016 | 147 |
| 2017 | 165 |
| 2018 | 152 |
| 2019 | 172 |
| 2020 | 141 |
| 2021 | 147 |
| 2022 | 145 |
| 2023 | 150 |
| 2024 | 120 |
| 2025 | 67 |
| 2026 | 30 |
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.\"completionStatus\" = 'Completed'
AND c.\"mKey\" IN (SELECT case_mkey FROM case_phases WHERE main = 450)
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 = 450)
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 ERA26LA313Accident · Minor injuriesClass 4 · LimitedFinal reportRobinson Helicopter R22 Beta · Milton, FLThe flight instructor’s failure to maintain control of the helicopter during a low hover over a grass area, which resulted in left skid contact with the ground and a dynamic rollover to the left.NTSB ERA26LA304Accident · No injuriesClass 4 · LimitedFinal reportRobinson Helicopter R22 Beta · Miramar, FLThe flight instructor’s failure to maintain control of the helicopter during a hover, which resulted in the left skid contacting ground and a subsequent dynamic rollover.NTSB CEN26LA286Accident · No injuriesClass 4 · LimitedFinal reportCessna T188C · Randolph, NEThe pilot’s failure to maintain clearance from a tree during a low-level aerial application flight.NTSB CEN26LA274Accident · No injuriesClass 4 · LimitedFinal reportCessna A188B · Algona, IAThe pilot’s failure to maintain control during a turn, which resulted in an aerodynamic stall.NTSB WPR26LA280Accident · Serious injuriesClass 4 · LimitedFinal reportHarmon Rocket II · Glasgow, MTThe pilot’s inadvertent selection of the fuel selector valve to the OFF position resulted in a total loss of engine power due to fuel starvation and subsequent forced landing to a field.NTSB ERA26LA284Accident · No injuriesClass 4 · LimitedFinal reportPiper PA28 · Palmetto, FLThe flight instructor’s failure to maintain clearance from obstacles during low altitude maneuvering, which resulted in a collision with a fence.NTSB WPR26LA277Accident · Serious injuriesClass 4 · LimitedFinal reportBell 206B III · Stonewall, OKThe pilot’s failure to maintain clearance from power lines while conducting a low-altitude aerial application.NTSB CEN26LA289Accident · No injuriesClass 4 · LimitedFinal reportRobinson Helicopter R44 Raven 1 · Scribner, NEThe pilot's failure to maintain clearance from power lines while maneuvering at low-level altitude during an agricultural operation.NTSB CEN26LA256Accident · No injuriesClass 4 · LimitedFinal reportRobinson Helicopter R44 II · Coralville, IAThe pilot’s failure to maintain clearance from a power line during a low-level aerial application flight.NTSB CEN26LA252Accident · Minor injuriesClass 4 · LimitedFinal reportAir Tractor AT802 · Whiting, KSThe pilot's failure to maintain clearance from an antenna while maneuvering during a low-level aerial application flight.NTSB WPR26LA247Accident · Serious injuriesClass 4 · LimitedFinal reportBell 47G · Springtown, TXThe pilot’s failure to maintain clearance from trees while in a low hover.NTSB WPR26LA220Accident · No injuriesClass 4 · LimitedFinal reportCessna 172S · Morgan Hill, CAAn in-flight collision with a bird.NTSB ERA26LA234Accident · Serious injuriesClass 4 · LimitedFinal reportRobinson Helicopter R44 · Mayesville, SCThe pilot’s failure to remain clear of a power line during an aerial application flight.NTSB CEN26LA209Accident · No injuriesClass 4 · LimitedFinal reportBellanca 7GCBC · Jonesboro, ARThe student pilot's failure to maintain adequate airspeed, which led to the airplane exceeding its critical angle of attack and experiencing an aerodynamic stall. Contributing to the accident was the pilot’s decision to practice slow flight maneuvers at an…NTSB CEN26LA203Accident · Serious injuriesClass 4 · LimitedFinal reportRobinson Helicopter R66 · Fort Worth, TXThe flight instructor’s delayed remedial action and the student pilot’s failure to maintain helicopter control during hover.NTSB CEN26LA221Accident · No injuriesClass 4 · LimitedFinal reportRockwell International S-2R · Gause, TXThe loss of engine power due to fuel starvation. Contributing to the accident was the separated wing fuel tank screen and sealant debris in the fuel tank.NTSB CEN26LA189Accident · No injuriesClass 4 · LimitedFinal reportMooney M20J · Morris, ILThe pilot’s inadequate fuel management, which resulted in a loss of engine power due to fuel starvation.NTSB WPR26LA188Accident · Minor injuriesClass 4 · LimitedFinal reportMcdonnell Douglas Helicopter 500 · Twin Falls, IDThe pilot’s failure to maintain control while hovering in gusty wind conditions, resulting in the helicopter rolling onto its side.NTSB CEN26LA185Accident · No injuriesClass 3 · LimitedFinal reportBell 407 · Dallas, TXThe pilot’s failure to maintain situational awareness and clearance from the helipad surveillance camera during liftoff.NTSB WPR26LA180Accident · Serious injuriesClass 4 · LimitedFinal reportCessna 172 · Marysvale, UTThe pilot's failure to maintain clearance from trees while maneuvering in mountainous terrain prior to encountering a downdraft.NTSB WPR26LA174Accident · Minor injuriesClass 4 · LimitedFinal reportAmerican Champion 7GCBC · Big Water, UTThe pilot’s failure to maintain adequate airspeed and exceedance of the airplanes critical angle of attack while maneuvering at a low altitude, which resulted in a subsequent stall and impact with trees during stall recovery.NTSB CEN26LA168Accident · Minor injuriesClass 4 · LimitedFinal reportRobinson Helicopter R44 · Mount Blanco, TXThe pilot’s failure to maintain proper main rotor rpm during a low-level turn, which resulted in the main rotor rpm drooping, a loss of control at an altitude too low for recovery, and a subsequent impact with terrain.NTSB ERA26LA181Accident · No injuriesClass 4 · LimitedFinal reportAeroprakt Mfg SP Z O O A32 · Lexington, KYThe flight instructor’s improper in-flight fuel management, which resulted in fuel starvation, a total loss of engine power, and a forced landing to rough terrain.NTSB WPR26LA123Accident · Serious injuriesClass 4 · LimitedFinal reportBrunner Donald G Kitfox · Rock Crossing, AZAn encounter with a downdraft while maneuvering at a low altitude, which resulted in an impact with terrain.NTSB CEN26LA128Accident · No injuriesClass 4 · LimitedFinal reportAir Tractor AT-502 · Larose, LAThe pilot’s improper fuel planning and his failure to adequately monitor the fuel level during flight, which resulted in fuel exhaustion, and a total loss of engine power. Contributing to the accident was the pilot’s lack of attention performing the task,…NTSB WPR26LA104Accident · No injuriesClass 4 · LimitedFinal reportAerosport Ikarus C42E · Wendover, UTThe pilot’s mismanagement of engine power during a maximum performance, 180° climbing left turn at a low altitude that resulted in impact with terrain.NTSB ERA26LA111Accident · No injuriesClass 4 · LimitedFinal reportCirrus Design SR22T · Thomson, GAAn in-flight collision with a bird while maneuvering.NTSB ERA26LA105Accident · Minor injuriesClass 4 · LimitedFinal reportPiper J3C · Brimfield, OHThe pilot’s failure to use carburetor heat during descent in cold temperatures, which resulted in a total loss of engine power at an altitude too low for recovery.NTSB CEN26LA101Accident · Minor injuriesClass 4 · LimitedFinal reportRobinson Helicopter R44 II · Sullivan, MOThe pilot’s failure to maintain clearance from powerlines during low-level operations.NTSB CEN26LA106Accident · No injuriesClass 4 · LimitedFinal reportCessna 172 · Lafayette, INThe flight instructor's inadequate supervision of the student during a stall recovery that developed into unusual attitude and exceedance of the airplane’s never exceed airspeed which resulted in structural damage to the airplane.NTSB CEN26LA074Accident · Minor injuriesClass 3 · LimitedFinal reportPitts S1S · Carbondale, ILA loss of engine power due to fuel starvation resulting from an uncommanded change to the fuel servo mixture position due to the improperly installed mixture cable.NTSB CEN26LA070Accident · Serious injuriesClass 4 · LimitedFinal reportGlynn RS-3 · Crabapple, TXThe pilot's failure to maintain clearance from a fence cable guy-line during low-level maneuvering over a river.NTSB CEN26LA055Accident · Serious injuriesClass 4 · LimitedFinal reportJust Highlander · Brazos, TXThe pilot’s failure to maintain clearance from power lines during low-level maneuvering along a river.NTSB WPR26LA053Accident · Serious injuriesClass 4 · LimitedFinal reportTecnam P2008 · Blackfoot, IDThe student pilot’s failure to maintain altitude and clearance from trees while maneuvering at night.NTSB ERA26LA036Accident · Minor injuriesClass 4 · LimitedFinal reportCzech Sport Aircraft A S Sportcruiser · Cuthbert, GAThe pilot’s failure to maintain clearance from trees and terrain while maneuvering for a precautionary landing, at low altitude and at night.NTSB CEN26LA036Accident · Serious injuriesClass 4 · LimitedFinal reportAir Tractor AT-502 · Gueydan, LAThe pilot’s failure to maintain situational awareness and clearance from terrain while maneuvering to avoid birds.NTSB ERA26LA003Accident · Minor injuriesClass 4 · LimitedFinal reportCessna 172 · West Milford, NJThe pilot’s failure to adequate clearance from obstacles while maneuvering during the landing approach and the instructor pilot’s delayed remedial action, which resulted in the airplane contacting a tree and terrain.NTSB WPR26LA015Accident · No injuriesClass 4 · LimitedFinal reportCessna 172S · Lathrop, CAAn inflight collision with a bird.NTSB CEN25LA396Accident · No injuriesClass 4 · LimitedFinal reportBell 206 · Archer City, TXThe pilot’s failure to maintain clearance from power lines while herding livestock.NTSB WPR25LA278Accident · Minor injuriesClass 4 · LimitedFinal reportDiamond Aircraft Ind DA 40 · Rocky Ridge, UTThe flight instructor’s inadequate supervision and delayed remedial action during an unusual attitude recovery, which resulted in a descent into terrain.NTSB ERA25LA341Accident · No injuriesClass 4 · LimitedFinal reportGrumman G-44A · Beaver Cove, METhe pilot’s distraction and failure to monitor the airplane’s flight path, which resulted in controlled flight into a lake.NTSB ERA25LA336Accident · Serious injuriesClass 4 · LimitedFinal reportLet L-23 Super Blanik · Ridgeland, SCThe pilot’s exceedance of the glider’s critical angle of attack which resulted in a loss of control while maneuvering to return for landing after a runway overshoot.NTSB CEN25LA359Accident · No injuriesClass 4 · LimitedFinal reportRobinson Helicopter R44 II · Nashville, ARThe pilot’s inadequate fuel planning which resulted in a total loss of power due to fuel exhaustion. Contributing to the accident was the landing zone being unlit.NTSB CEN25LA336Accident · No injuriesClass 4 · LimitedFinal reportPiper PA-25-235 · Argusville, NDThe pilot’s failure to maintain clearance from terrain while maneuvering at low altitude.NTSB CEN25LA334Accident · No injuriesClass 4 · LimitedFinal reportKaman Aerospace K-1200 · Eagle, COThe pilot’s failure to maintain helicopter control which resulted in an uncontrolled descent and impact with terrain.NTSB CEN25LA322Accident · No injuriesClass 3 · LimitedFinal reportPiper PA-18-150 · Joliet, ILThe failure of the No. 2 cylinder exhaust valve, which resulted in a total loss of engine power.NTSB WPR25LA246Accident · No injuriesClass 4 · LimitedFinal reportHiller UH-12E · Fobes Hill, WAThe pilot’s abrupt maneuver to avoid a powerline during an aerial application flight, which resulted in the helicopter’s impact with terrain.NTSB ANC25LA085Accident · No injuriesClass 4 · LimitedFinal reportDehavilland DHC-2 MK 1 · Soldotna, AKThe pilot’s failure to maintain clearance from rising terrain while maneuvering at low altitude.NTSB CEN25FA307Accident · 2 fatalClass 3 · FieldFinal reportHughes 369D · West Alton, MOThe pilot’s failure to maintain helicopter clearance from the powerline during the powerline maintenance operation for reasons that could not be determined.NTSB WPR25LA239Accident · Minor injuriesClass 4 · LimitedFinal reportRobinson Helicopter R44 II · Ponderosa Pines, MTThe pilot’s improper pedal application during an approach to a hover.