# NTSB investigations: Enroute

NTSB aviation accident and incident investigations since 1962: the probable cause, findings, aircraft, crew, weather and docket of each, linked to the FAA registry and the FAA’s own reports.

Page 180 of 718 · 35,885 cases

## Cases, newest first

- [NTSB CHI99LA352](https://openairdocs.org/ntsb/CHI99LA352.md): Cessna 150M · Lebanon, MO · Accident · No injuries · Limited investigation · Final report · Sep 6, 1999 · N63668 · Substantial damage
  > A loss of engine power due to a fractured shaft supporting the number three cylinder rocker arm. A factor relating to this accident was the trees.
- [NTSB CHI99LA319](https://openairdocs.org/ntsb/CHI99LA319.md): Van Grouw White Lightning · Greenfield, IN · Accident · No injuries · Limited investigation · Final report · Sep 6, 1999 · N25WL · Substantial damage
  > improper installation of the oil quick drain plug which resulted in oil exhaustion to the engine. A factor was the corn crop encountered during the forced landing.
- [NTSB ATL99LA125](https://openairdocs.org/ntsb/ATL99LA125.md): Cessna 172P · Buchanan, GA · Accident · No injuries · Limited investigation · Final report · Sep 6, 1999 · N7883U · Substantial damage
  > The loss of engine power for undetermined reasons. Factors were conditions favorable for the formation of carburetor ice during glide and cruise, and rough and uneven terrain.
- [NTSB LAX99LA295](https://openairdocs.org/ntsb/LAX99LA295.md): Cessna 150M · Menlo Park, CA · Accident · No injuries · Limited investigation · Final report · Sep 5, 1999 · N8135U · Substantial damage
  > The fatigue failure of the left muffler rear wall, which resulted in hot exhaust gasses being ported onto, and shorting, the magneto p-lead wires. The failure of maintenance personnel to detect the impending failure of the muffler during the recent engine…
- [NTSB DEN99LA174](https://openairdocs.org/ntsb/DEN99LA174.md): Cessna P210N · Santa Fe, NM · Accident · No injuries · Limited investigation · Final report · Sep 5, 1999 · N999KM · Substantial damage
  > A non-mechanical total loss of engine power for reasons undetermined. Factors were maneuvering to avoid oncoming vehicles, and the rough and uneven terrain.
- [NTSB CHI99LA320](https://openairdocs.org/ntsb/CHI99LA320.md): Cessna 172D · South Wayne, WI · Accident · Serious injuries · Limited investigation · Final report · Sep 4, 1999 · N2972U · Substantial damage
  > the pilot's improper selection of an emergency field and failure to maintain clearance from the trees. The cause of the loss of engine power was not determined.
- [NTSB ATL99FA122](https://openairdocs.org/ntsb/ATL99FA122.md): Mooney M20J · Gainesville, GA · Accident · 3 fatal · Field investigation · Final report · Sep 3, 1999 · N4072H · Destroyed
  > The pilot's failure to maintain flying speed which resulted in a stall and the subsequent collision with terrain.
- [NTSB ANC99FA130](https://openairdocs.org/ntsb/ANC99FA130.md): Piper PA-32R-300 · Bettles, AK · Accident · 1 fatal · Field investigation · Final report · Sep 3, 1999 · N9166K · Destroyed
  > The pilot's continued flight into known adverse weather conditions. Factors in the accident were low ceilings and snow.
- [NTSB LAX99LA291](https://openairdocs.org/ntsb/LAX99LA291.md): Boeing 737-322 · Santa Barbara, CA · Accident · Serious injuries · Limited investigation · Final report · Sep 2, 1999 · N371UA · Minor damage
  > The flight's encounter with wake vortices from a preceding heavy aircraft.
- [NTSB LAX99FA294](https://openairdocs.org/ntsb/LAX99FA294.md): Mooney M20D · Bear Valley, CA · Accident · 1 fatal · Field investigation · Final report · Sep 2, 1999 · N6831U · Destroyed
  > The pilot's in-flight loss of control for undetermined reasons.
- [NTSB ANC99LA126](https://openairdocs.org/ntsb/ANC99LA126.md): Cessna A185E · Anchorage, AK · Accident · No injuries · Limited investigation · Final report · Aug 30, 1999 · N124LR · Substantial damage
  > The total loss of engine power for an undetermined reason.
- [NTSB SEA99FA152](https://openairdocs.org/ntsb/SEA99FA152.md): Cessna T210M · Marcola, OR · Accident · 3 fatal · Field investigation · Final report · Aug 29, 1999 · N747CC · Destroyed
  > The pilot's failure to maintain clearance from the terrain while descending in an area of deteriorating weather. Factors include mountainous terrain, clouds, low ceilings, the pilot's inadequate preflight weather analysis, and his improper decision to attempt…
- [NTSB SEA99FA150](https://openairdocs.org/ntsb/SEA99FA150.md): Cessna 182E · Ryegate, MT · Accident · 4 fatal · Field investigation · Final report · Aug 28, 1999 · N2886Y · Destroyed
  > The pilot's continued VFR flight into IMC conditions and his failure to maintain clearance from mountainous terrain. Factors include low ceilings and inadequate in-flight planning.
- [NTSB MIA99LA243](https://openairdocs.org/ntsb/MIA99LA243.md): Powers Rotorway Exec 162 · Lutz, FL · Accident · No injuries · Limited investigation · Final report · Aug 28, 1999 · N314SP · Substantial damage
  > a loss of power due to undetermined reasons, resulting in a forced landing and subsequent impact with the ground. A factor in this accident was the pilot was not qualified or certified in helicopters.
- [NTSB LAX99LA287](https://openairdocs.org/ntsb/LAX99LA287.md): Mooney M20J · Emigrant Gap, CA · Accident · Minor injuries · Limited investigation · Final report · Aug 28, 1999 · N4201S · Substantial damage
  > The fatigue failure and separation of the number three cylinder due to the cylinder overhaul facility's improper inspection and quality control processes.
- [NTSB ANC99LA127](https://openairdocs.org/ntsb/ANC99LA127.md): Maule M-7 · Kotzebue, AK · Accident · No injuries · Limited investigation · Final report · Aug 28, 1999 · N770AS · Substantial damage
  > An in-flight collision with a bird.
- [NTSB CHI99IA350](https://openairdocs.org/ntsb/CHI99IA350.md): British Aerospace Jetstream 3101 · South Bend, IN · Incident · No injuries · Incident investigation · Final report · Aug 27, 1999 · N460CE · No damage
  > the right engine accessory section's splined gear spur gear failure during cruise flight.
- [NTSB ATL99LA119](https://openairdocs.org/ntsb/ATL99LA119.md): Cessna 175 · Mountain City, TN · Accident · Serious injuries · Limited investigation · Final report · Aug 27, 1999 · N7566M · Substantial damage
  > A blocked fuel system vent that resulted in fuel starvation and the complete loss of engine power.
- [NTSB NYC99LA212](https://openairdocs.org/ntsb/NYC99LA212.md): Cessna 150 · Madison, OH · Accident · No injuries · Limited investigation · Final report · Aug 26, 1999 · N2475J · Substantial damage
  > The pilot's delay in using carburetor heat which resulted in a partial loss of engine power, and a forced landing.
- [NTSB NYC99FA214](https://openairdocs.org/ntsb/NYC99FA214.md): Cessna 172N · Dyke, VA · Accident · 4 fatal · Field investigation · Final report · Aug 25, 1999 · N733DH · Destroyed
  > The pilot's inadvertent flight into instrument meteorological conditions, which resulted in his inability to see the rapidly rising terrain. A factor was the pilot's inaccurate evaluation of the weather.
- [NTSB MIA99LA238](https://openairdocs.org/ntsb/MIA99LA238.md): Piper PA-28-140 · Jackson, AL · Accident · Minor injuries · Limited investigation · Final report · Aug 25, 1999 · N6685J · Substantial damage
  > the pilot's inadequate preflight planning and preparation, which resulted in taking off with the airplane's maximum gross weight exceeded, and subsequent impact with trees. Factors in this accident were high temperatures and an in-flight encounter with a…
- [NTSB NYC99LA209](https://openairdocs.org/ntsb/NYC99LA209.md): Morrisey 2150A · Ellisburg, NY · Accident · Serious injuries · Limited investigation · Final report · Aug 24, 1999 · N312BW · Substantial damage
  > The pilot's delay in applying carburetor heat which resulted in the loss of power, and his misjudgment of the flare during the forced landing.
- [NTSB MIA99LA234](https://openairdocs.org/ntsb/MIA99LA234.md): Bellanca 17-30A · Robbins, TN · Accident · Serious injuries · Limited investigation · Final report · Aug 23, 1999 · N42VB · Substantial damage
  > The total loss of engine power due to failure of maintenance personnel to assure that the thru bolt nut at the Nos. 2 and 3 cylinders was adequately torqued following removal and replacement of the No. 3 cylinder approximately 328 hours earlier. Also, the…
- [NTSB ANC99LA118](https://openairdocs.org/ntsb/ANC99LA118.md): Cessna 206 · Anaktuvuk Pass, AK · Accident · No injuries · Limited investigation · Final report · Aug 22, 1999 · N5446X · Substantial damage
  > The pilot's continued flight into adverse weather conditions after becoming lost/disoriented. Factors in the accident were rising terrain, a blind/box canyon, and weather conditions consisting of clouds, rain, and fog.
- [NTSB NYC99LA208](https://openairdocs.org/ntsb/NYC99LA208.md): Klotz Kolb Mark III · Scott, OH · Accident · 2 fatal · Limited investigation · Final report · Aug 21, 1999 · N6268A · Substantial damage
  > The pilot's failure to maintain airspeed, which resulted in a stall, after he experienced a loss of lift due to an improperly installed gap seal.
- [NTSB CHI99LA308](https://openairdocs.org/ntsb/CHI99LA308.md): Piper PA-18-150 · Granite City, IL · Accident · No injuries · Limited investigation · Final report · Aug 21, 1999 · N90904 · Substantial damage
  > Loss of power for undetermined reason(s) and the rough/uneven.
- [NTSB LAX99LA277](https://openairdocs.org/ntsb/LAX99LA277.md): Cessna T210L · Byron, CA · Accident · No injuries · Limited investigation · Final report · Aug 20, 1999 · N5378V · Substantial damage
  > The failure of the operator's maintenance personnel to properly torque the cylinder and engine case through bolts during the replacement of five cylinders, which led to the spinning of the No. 2 main bearing and the resultant oil starvation induced…
- [NTSB DEN99LA164](https://openairdocs.org/ntsb/DEN99LA164.md): Cessna 180 · Columbus, NM · Accident · No injuries · Limited investigation · Final report · Aug 20, 1999 · N4796B · Substantial damage
  > Fuel exhaustion because the pilot issued instructions that the fuel tanks not be filled to capacity. A factor was the unsuitable terrain on which to make a forced landing.
- [NTSB NYC99LA207](https://openairdocs.org/ntsb/NYC99LA207.md): Cessna 152 · Rockville, VA · Accident · No injuries · Limited investigation · Final report · Aug 19, 1999 · N49014 · Substantial damage
  > Fuel exhaustion as a result of the pilot's improper in-flight planning/decision.
- [NTSB LAX99FA273](https://openairdocs.org/ntsb/LAX99FA273.md): Balloon Works Firefly 11 · Cave Creek, AZ · Accident · Serious injuries · Field investigation · Final report · Aug 19, 1999 · N7021U · Minor damage
  > An unforecast encounter with a low level microburst that resulted in a distortion of the balloon envelope, an excessive outflow of hot air (loss of lift), creating an excessive rate of descent that was beyond the performance capability of the balloon to…
- [NTSB LAX99LA268](https://openairdocs.org/ntsb/LAX99LA268.md): Piper PA-28-181 · Sacramento, CA · Accident · Minor injuries · Limited investigation · Final report · Aug 17, 1999 · N3004U · Substantial damage
  > Fuel exhaustion due to the pilot's failure to ensure that sufficient fuel was on board to complete the flight, and, the flight instructor's inadequate supervision of the flight.
- [NTSB LAX99FA270](https://openairdocs.org/ntsb/LAX99FA270.md): Beech J35 · Marysville, CA · Accident · Serious injuries · Field investigation · Final report · Aug 17, 1999 · N4932B · Destroyed
  > A loss of engine power due to improperly torque cylinder base nuts by maintenance personnel during a top overhaul.
- [NTSB ANC99LA120](https://openairdocs.org/ntsb/ANC99LA120.md): Cessna 182Q · Fairbanks, AK · Accident · No injuries · Limited investigation · Final report · Aug 17, 1999 · N25ZZ · Substantial damage
  > A loss of engine power for an undetermined reason. A factor was unsuitable terrain for a forced landing.
- [NTSB NYC99LA202](https://openairdocs.org/ntsb/NYC99LA202.md): Mooney M20E · Prattsburg, NY · Accident · Serious injuries · Limited investigation · Final report · Aug 15, 1999 · N3243F · Destroyed
  > Propeller blade separation, resulting from fatigue cracking initiated by intergranular corrosion. A factor was the lack of propeller blade corrosion inspection requirements.
- [NTSB CHI99LA292](https://openairdocs.org/ntsb/CHI99LA292.md): Brantly Helicopter B-2B · Hudson, MI · Accident · No injuries · Limited investigation · Final report · Aug 15, 1999 · N2238U · Substantial damage
  > was an inadequate preflight and misjudged flare to landing during the autorotation by the pilot. A factor in this accident was a totally blocked fuel tank vent system.
- [NTSB CHI99FA293](https://openairdocs.org/ntsb/CHI99FA293.md): Hudson Avenger · Lansing, IL · Accident · 2 fatal · Field investigation · Final report · Aug 15, 1999 · N4088X · Destroyed
  > the weight and balance exceeded by the owner/builder. The inadequate preflight planning/preparation by the owner/builder.
- [NTSB NYC99FA199](https://openairdocs.org/ntsb/NYC99FA199.md): Cessna P210N · Worcester, VT · Accident · 3 fatal · Field investigation · Final report · Aug 14, 1999 · N24CD · Destroyed
  > The pilot's inadequate in-flight planning/decision, his failure to follow the published instrument departure procedure for the particular runway, and his continued flight into known adverse weather. A factor was thunderstorms.
- [NTSB LAX99LA269](https://openairdocs.org/ntsb/LAX99LA269.md): Cessna 152 · Buckeye, AZ · Accident · No injuries · Limited investigation · Final report · Aug 14, 1999 · N49100 · Destroyed
  > fuel exhaustion due to the pilot's inaccurate fuel consumption calculations used in flight planning.
- [NTSB ATL99LA116](https://openairdocs.org/ntsb/ATL99LA116.md): Cessna R172-E · Chiefland, FL · Accident · Minor injuries · Limited investigation · Final report · Aug 14, 1999 · N667GA · Substantial damage
  > Premature fuel exhaustion due to a cracked fuel line. Contributing to the severity of the accident was the electrical service drop line, which crossed the roadway.
- [NTSB NYC99LA200](https://openairdocs.org/ntsb/NYC99LA200.md): Cessna 208 · Hillsborough, NH · Accident · Minor injuries · Limited investigation · Final report · Aug 13, 1999 · N193GE · Destroyed
  > an inadequate auxiliary fuel tank installation which resulted in a leak of undetermined origin.
- [NTSB CHI99FA290](https://openairdocs.org/ntsb/CHI99FA290.md): Piper PA-28-181 · Paw Paw, MI · Accident · 4 fatal · Field investigation · Final report · Aug 13, 1999 · N281PF · Destroyed
  > the pilot flew into known adverse weather, the pilot's lack of total instrument flight experience, and the pilot exceeded the design limits of the airplane. Factors included the pilot's total lack of experience in the type of operation and the pilot's…
- [NTSB FTW99LA220](https://openairdocs.org/ntsb/FTW99LA220.md): Air Tractor AT-401 · Humphrey, AR · Accident · No injuries · Limited investigation · Final report · Aug 12, 1999 · N1031Q · Substantial damage
  > Fuel exhaustion as a result of the pilot's failure to refuel the airplane.
- [NTSB SEA99FA138](https://openairdocs.org/ntsb/SEA99FA138.md): Beech H-35 · Swan Lake, MT · Accident · Serious injuries · Field investigation · Final report · Aug 10, 1999 · N7975D · Substantial damage
  > Detonation/pre-ignition due to use of improper grade and type of fuel (automotive) and the pilot-in-command's failure to use proper fuel specified by manufacturer's directives.
- [NTSB MIA99LA228](https://openairdocs.org/ntsb/MIA99LA228.md): William John Schulz WJS Jaybird · Tangerine, FL · Accident · No injuries · Limited investigation · Final report · Aug 10, 1999 · N735BS · Substantial damage
  > the pilot's improper torqueing of a rocker arm adjusting jam nut, that resulted in the adjuster loosening, and a partial loss of engine power. This resulted in the pilot making an off airport precautionary landing and subsequent nose over, during which the…
- [NTSB SEA99LA136](https://openairdocs.org/ntsb/SEA99LA136.md): Cessna 182G · Freeland, WA · Accident · Minor injuries · Limited investigation · Final report · Aug 9, 1999 · N2492R · Substantial damage
  > The pilot-in-command's improper use of carburetor heat and overload of the nose gear assembly during the forced landing. Contributing factors were carburetor icing conditions, the ditch and fence.
- [NTSB MIA99LA218](https://openairdocs.org/ntsb/MIA99LA218.md): Cessna 150G · Greeneville, TN · Accident · Minor injuries · Limited investigation · Final report · Aug 9, 1999 · N3187X · Substantial damage
  > The pilot's failure to remain clear of clouds while operating under visual flight rules resulting in the aircraft colliding with trees on rising terrain as he flew in the clouds.
- [NTSB FTW99LA250](https://openairdocs.org/ntsb/FTW99LA250.md): Cessna 177 · Austin, TX · Accident · No injuries · Limited investigation · Final report · Aug 9, 1999 · N29317 · Substantial damage
  > Fuel exhaustion as a result of the pilot's failure to refuel the airplane.
- [NTSB DEN99LA140](https://openairdocs.org/ntsb/DEN99LA140.md): Pzl-Mielec M-18A · Hasty, CO · Accident · No injuries · Limited investigation · Final report · Aug 9, 1999 · N9103Y · Substantial damage
  > The pilot's failure to refuel his airplane, and the subsequent airborne fuel exhaustion. Factors were the lack of suitable terrain for a forced landing, and the high vegetation in the field.
- [NTSB CHI99LA286](https://openairdocs.org/ntsb/CHI99LA286.md): Cessna 152 · Evansville, IN · Accident · Minor injuries · Limited investigation · Final report · Aug 9, 1999 · N4611P · Substantial damage
  > fuel exhaustion due to the flight instructor's improper in-flight decision. A factor was the ditch.
- [NTSB FTW99LA213](https://openairdocs.org/ntsb/FTW99LA213.md): Cessna 172N · Hot Springs, AR · Accident · No injuries · Limited investigation · Final report · Aug 8, 1999 · N737JP · Substantial damage
  > the pilot's failure to refuel the airplane which resulted in fuel exhaustion and a total loss of engine power. A factor was the lack of suitable terrain for a forced landing.

Next page: https://openairdocs.org/ntsb-phases/400/cases.md?page=181

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
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."mKey" IN (SELECT case_mkey FROM case_phases WHERE main = 400)
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-phases/400/cases?page=180

---
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.