# NTSB investigations, 1997: Maneuvering

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 1 of 6 · 262 cases

## Latest cases

- [NTSB CHI98LA075](https://openairdocs.org/ntsb/CHI98LA075.md): Piper PA-28-161 · Boone, IA · Accident · No injuries · Limited investigation · Final report · Dec 31, 1997 · N8465F · Substantial damage
  > failure of the pilot to maintain sufficient altitude/clearance from obstruction(s), while flying low over a river. The obstruction (power line) was a related factor.
- [NTSB LAX98LA054](https://openairdocs.org/ntsb/LAX98LA054.md): Piper J3C-65 · Stoil, CA · Accident · Serious injuries · Limited investigation · Final report · Dec 24, 1997 · N91915 · Destroyed
  > The pilot's failure to maintain adequate obstacle clearance and his inadequate visual outlook.. Factors were a severed fuel line which resulted in an in-flight fire, which diminished the pilot's ability to land the airplane with smoke and fire in the cockpit.
- [NTSB FTW98LA075](https://openairdocs.org/ntsb/FTW98LA075.md): Cessna 172M · Monticello, UT · Accident · 1 fatal · Limited investigation · Final report · Dec 24, 1997 · N1596V · Substantial damage
  > The pilot's failure to maintain adequate altitude and clearance from obstacles. Also causal was the pilot becoming lost and disoriented. Contributing factors were his lack of familiarity with the geographical area, lack of experience, night conditions, and…
- [NTSB CHI98FA070](https://openairdocs.org/ntsb/CHI98FA070.md): Piper PA-32-301 · Hampshire, IL · Accident · 4 fatal · Field investigation · Final report · Dec 23, 1997 · N2586Y · Destroyed
  > the pilot's intentional flight into known icing conditions, and the accumulation of ice on the leading edges of the airplane's empennage and wings leading to the inadvertent stall/mush. A factor contributing to this accident was the icing conditions.
- [NTSB NYC98FA048](https://openairdocs.org/ntsb/NYC98FA048.md): Cessna 152 · Spring City, PA · Accident · 2 fatal · Field investigation · Final report · Dec 21, 1997 · N22LU · Destroyed
  > The pilot's failure to maintain adequate airspeed which resulted in a stall and subsequent in-flight collision with terrain.
- [NTSB LAX98LA059](https://openairdocs.org/ntsb/LAX98LA059.md): Mooney M20F · Safford, AZ · Accident · Serious injuries · Limited investigation · Final report · Dec 20, 1997 · N2965L · Destroyed
  > The pilot's poor in-flight judgement and intentional flight into known adverse weather conditions. Related factors were, mountainous terrain, rain and fog.
- [NTSB FTW98TA072](https://openairdocs.org/ntsb/FTW98TA072.md): Bell 206B-III · Reserve, NM · Accident · Serious injuries · Final report · Dec 18, 1997 · N124DA · Substantial damage
  > The pilot's inadvertent loss of tail rotor effectiveness. A factor was the high density altitude weather condition.
- [NTSB NYC98LA043](https://openairdocs.org/ntsb/NYC98LA043.md): Robinson R22 Beta · Belle Vernon, PA · Accident · 1 fatal · Limited investigation · Final report · Dec 16, 1997 · N55TP · Destroyed
  > The pilot's improper out-of-ground hover procedure, which resulted in a loss of tailrotor effectiveness.
- [NTSB FTW98LA062](https://openairdocs.org/ntsb/FTW98LA062.md): Cessna 175A · Houston, TX · Accident · Minor injuries · Limited investigation · Final report · Dec 13, 1997 · N6846E · Substantial damage
  > The total loss of engine power resulting from detonation and the ensuing failure of the engine piston and connecting rod components. Factors were: the instructor's decision to take off with a known deficiency (magneto drop over limit), the flight instructor's…
- [NTSB SEA98LA022](https://openairdocs.org/ntsb/SEA98LA022.md): Cessna 150J · Silverdale, WA · Accident · No injuries · Limited investigation · Final report · Dec 10, 1997 · N51369 · Substantial damage
  > Ice accumulation in the carburetor throat. Factors include conditions conducive to serious carburetor icing, an inoperative starter due to a separated pull-to-start knob, and soft terrain at the location of the forced landing.
- [NTSB NYC98LA039](https://openairdocs.org/ntsb/NYC98LA039.md): Cessna 172M · New Salem, MA · Accident · 1 fatal · Limited investigation · Final report · Dec 9, 1997 · N12219 · Substantial damage
  > The pilot's failure to maintain adequate altitude/clearance above the water due to his impairment by drugs. A factor in this accident was the glassy water condition.
- [NTSB ATL98LA021](https://openairdocs.org/ntsb/ATL98LA021.md): Hughes TH-55 · Bushnell, FL · Accident · No injuries · Limited investigation · Final report · Dec 9, 1997 · N74914 · Substantial damage
  > The pilot's failure to maintain clearance from the trees during a hover. A factor was the pilot's diverted attention.
- [NTSB FTW98FA063](https://openairdocs.org/ntsb/FTW98FA063.md): Pitts S-2B · Bozeman, MT · Accident · 3 fatal · Field investigation · Final report · Dec 7, 1997 · N693SB · 2 aircraft · Destroyed
  > The failure of both pilots to maintain visual lookout. Factors were the pilot of N693SB not following procedures and directives, and the pilot of N693SB using poor judgment.
- [NTSB SEA98LA021](https://openairdocs.org/ntsb/SEA98LA021.md): Enstrom F-28F · John Day, OR · Accident · No injuries · Limited investigation · Final report · Dec 6, 1997 · N171HH · Substantial damage
  > a loss of engine power for undetermined reasons.
- [NTSB FTW98LA065](https://openairdocs.org/ntsb/FTW98LA065.md): Artic S-1B2 · Worland, WY · Accident · No injuries · Limited investigation · Final report · Dec 6, 1997 · N71AT · Substantial damage
  > loss of engine power for undetermined reason(s). A related factor was the rough and uneven terrain on which the forced landing was made.
- [NTSB SEA98LA020](https://openairdocs.org/ntsb/SEA98LA020.md): Schramm Helicycle · Big Timber, MT · Accident · Minor injuries · Limited investigation · Final report · Dec 5, 1997 · N3275Q · Substantial damage
  > the pilot's failure to maintain clearance from power lines. The pilot's diverted attention and transmission wires were factors.
- [NTSB SEA98LA018](https://openairdocs.org/ntsb/SEA98LA018.md): Aero Commander 112 · Kettle Falls, WA · Accident · 3 fatal · Limited investigation · Final report · Dec 1, 1997 · N1054J · Destroyed
  > The pilot's failure to maintain terrain clearance while maneuvering. Factors include the physiological impairment of the pilot's judgement due to alcohol.
- [NTSB FTW98LA049](https://openairdocs.org/ntsb/FTW98LA049.md): Robinson R22 Beta · Lubbock, TX · Accident · No injuries · Limited investigation · Final report · Nov 15, 1997 · N26026 · Substantial damage
  > failure of the student pilot to maintain control of the helicopter during hover out-of-ground-effect. A related factor was: the student pilot's lack of experience in flying helicopters.
- [NTSB CHI98IA035](https://openairdocs.org/ntsb/CHI98IA035.md): Cessna 152 · Blaine, MN · Incident · No injuries · Incident investigation · Final report · Nov 12, 1997 · N48863 · Minor damage
  > the fracture of the flap cable as a result of fatigue cracking.
- [NTSB SEA98LA013](https://openairdocs.org/ntsb/SEA98LA013.md): Bell 206B · Forest Grove, OR · Accident · No injuries · Limited investigation · Final report · Nov 8, 1997 · N101LF · Destroyed
  > Excessive deceleration of the helicopter by the pilot-in-command, resulting in an in-flight main rotor blade strike on the helicopter's external load line and subsequent main rotor separation. Downhill terrain which led to a descending approach to the pickup…
- [NTSB CHI98LA030](https://openairdocs.org/ntsb/CHI98LA030.md): Piper PA-38 · Madison, WI · Accident · No injuries · Limited investigation · Final report · Nov 5, 1997 · N2536N · Substantial damage
  > the flight instructor's (CFI's) inadequate supervision of the flight, and his failure to ensure that control of the airplane was maintained. Factors associated with the accident were: the CFI's improper use of flaps, and subsequent contact with the runway…
- [NTSB CHI98LA029](https://openairdocs.org/ntsb/CHI98LA029.md): Piper PA-24-250 · Robinson, IL · Accident · 1 fatal · Limited investigation · Final report · Nov 2, 1997 · N7890P · Destroyed
  > the pilot's improper decision to continue flight into adverse weather conditions The low ceiling and the heavy rain were factors.
- [NTSB MIA98LA018](https://openairdocs.org/ntsb/MIA98LA018.md): Saldairiaga Buccaneer II · Clermont, FL · Accident · 1 fatal · Limited investigation · Final report · Nov 1, 1997 · N813LJ · Destroyed
  > failure of the pilot to maintain adequate airspeed, while maneuvering at a low altitude, which resulted in an inadvertent stall and subsequent in-flight collision with terrain.
- [NTSB CHI98GA025](https://openairdocs.org/ntsb/CHI98GA025.md): Aerospatiale AS350B · Frankfort, IL · Accident · 2 fatal · Final report · Oct 30, 1997 · N911RR · Destroyed
  > the pilot in command misjudged the clearance with the terrain during a dark night maneuvering approach to a runway. A related factor was the dark night conditions.
- [NTSB MIA98LA014](https://openairdocs.org/ntsb/MIA98LA014.md): Aerofab Lake LA-250 · Miami, FL · Accident · No injuries · Limited investigation · Final report · Oct 29, 1997 · N85HG · Substantial damage
  > loss of engine power for an undetermined reason(s), which resulted in a forced landing and subsequent encounter with rough water.
- [NTSB FTW98LA034](https://openairdocs.org/ntsb/FTW98LA034.md): Wsk Pzl Mielec M-18A · Roanoke, LA · Accident · No injuries · Limited investigation · Final report · Oct 27, 1997 · N149RA · Substantial damage
  > loss of engine power for an undetermined reason(s). A factor relating to the accident was: the lack of suitable terrain for a forced landing.
- [NTSB LAX98FA022](https://openairdocs.org/ntsb/LAX98FA022.md): Extra Flugzeugbau EA-300 · Castaic, CA · Accident · 2 fatal · Field investigation · Final report · Oct 26, 1997 · N69BW · Destroyed
  > The pilot's failure to maintain control of the aircraft during an aerobatic maneuver.
- [NTSB NYC98LA023](https://openairdocs.org/ntsb/NYC98LA023.md): Hiller UH-12D · Farmingdale, NJ · Accident · No injuries · Limited investigation · Final report · Oct 24, 1997 · N62316 · Substantial damage
  > The certificated flight instructor's inadequate supervision and failure to maintain directional control.
- [NTSB CHI98FA022](https://openairdocs.org/ntsb/CHI98FA022.md): Mooney M20K · Emporia, KS · Accident · 3 fatal · Field investigation · Final report · Oct 24, 1997 · N305RJ · Destroyed
  > The pilot's failure to maintain an altitude above the minimum descent altitude for the approach. Factors contributing to this accident were the low ceiling, rain, and fog.
- [NTSB FTW98FA028](https://openairdocs.org/ntsb/FTW98FA028.md): Weatherly 620B · Cee Vee, TX · Accident · 1 fatal · Field investigation · Final report · Oct 22, 1997 · N46278 · Destroyed
  > The pilot's failure to maintain clearance with the power lines during an aerial application flight.
- [NTSB NYC98FA017](https://openairdocs.org/ntsb/NYC98FA017.md): Extra Flugzeugbau EA-200 · Radnor, OH · Accident · 1 fatal · Field investigation · Final report · Oct 21, 1997 · N11EX · Destroyed
  > The failure of the pilot to obtain the proper altitude/clearance above the terrain, to perform an aerobatic maneuver. A factor was the pilot's lack of total experience in make and model.
- [NTSB ATL98LA004](https://openairdocs.org/ntsb/ATL98LA004.md): Piper PA-25-235C · Blakley, GA · Accident · No injuries · Limited investigation · Final report · Oct 20, 1997 · N9567P · Destroyed
  > the pilot misjudge clearance from trees during pull-up from a swath run. The obstructions (power line and trees) were related factors.
- [NTSB FTW98LA026](https://openairdocs.org/ntsb/FTW98LA026.md): Cessna 182P · Thompsons, TX · Accident · No injuries · Limited investigation · Final report · Oct 19, 1997 · N10DG · Substantial damage
  > The loss of engine power resulting from a disconnected carburetor float due to improper maintenance. A factor was the lack of suitable terrain for a forced landing.
- [NTSB FTW98LA030](https://openairdocs.org/ntsb/FTW98LA030.md): Bell 47G-4A · Welsh, LA · Accident · No injuries · Limited investigation · Final report · Oct 16, 1997 · N7104J · Substantial damage
  > the pilot's failure to maintain control of the helicopter, while maneuvering to avoid an obstruction. The abrupt maneuver was a related factor.
- [NTSB LAX98FA013](https://openairdocs.org/ntsb/LAX98FA013.md): Beech 99-C99 · Meadview, AZ · Accident · No injuries · Field investigation · Final report · Oct 15, 1997 · N227AV · Substantial damage
  > The pilot's inadequate in-flight decision, inadequate visual lookout, and his failure to maintain adequate obstacle clearance. Contributing was low altitude flight.
- [NTSB FTW98LA016](https://openairdocs.org/ntsb/FTW98LA016.md): Grumman-Schweizer G-164A · Altus, OK · Accident · No injuries · Limited investigation · Final report · Oct 15, 1997 · N8819H · Substantial damage
  > The loss of engine power due to the cracked cylinder. A factor was the lack of suitable terrain for the forced landing.
- [NTSB ANC98LA003](https://openairdocs.org/ntsb/ANC98LA003.md): Bell 206-B2 · Sutton, AK · Accident · No injuries · Limited investigation · Final report · Oct 15, 1997 · N86TA · Substantial damage
  > The pilot's failure to maintain clearance between the tail rotor and the external long line cable, and the subsequent entanglement of the tail rotor with the long line.
- [NTSB FTW98FA012](https://openairdocs.org/ntsb/FTW98FA012.md): Cessna A188B · Morton, TX · Accident · 1 fatal · Field investigation · Final report · Oct 14, 1997 · N731GY · Destroyed
  > The pilot's failure to maintain clearance from the power lines while maneuvering during an aerial application flight.
- [NTSB LAX98LA016](https://openairdocs.org/ntsb/LAX98LA016.md): Cessna 150 · Temple Bar, AZ · Accident · No injuries · Limited investigation · Final report · Oct 13, 1997 · N71VL · Substantial damage
  > the pilot's improper planning/decision, which resulted in fuel exhaustion and loss of engine power. A factor relating to the accident was: the terrain condition (ditch) in the emergency landing area.
- [NTSB LAX98FA009](https://openairdocs.org/ntsb/LAX98FA009.md): Bellanca 7ECA · Tracy, CA · Accident · 1 fatal · Field investigation · Final report · Oct 12, 1997 · N11860 · Destroyed
  > The pilot's low operating altitude and his failure to maintain appropriate clearance during low level maneuvering flight. Contributing factors were transmission wires and the physical impairment that resulted from the effects of the over-the-counter…
- [NTSB IAD98FA005](https://openairdocs.org/ntsb/IAD98FA005.md): Bell 206B · Sago, WV · Accident · 4 fatal · Field investigation · Final report · Oct 12, 1997 · N911RH · Destroyed
  > The improper overhaul of the turbine governor by the manufacturer, which resulted in the loss of power.
- [NTSB ATL98LA001](https://openairdocs.org/ntsb/ATL98LA001.md): Grumman-Schweizer G-164A · Sylvania, GA · Accident · No injuries · Limited investigation · Final report · Oct 12, 1997 · N4983 · Destroyed
  > The pilots failure to maintain clearance from transmission wires.
- [NTSB LAX98FA007](https://openairdocs.org/ntsb/LAX98FA007.md): Schweizer 2-32 · Warner Springs, CA · Accident · 1 fatal · Field investigation · Final report · Oct 11, 1997 · N242DB · Substantial damage
  > the pilot's inadvertent flight into instrument meteorological conditions after inadvertently encountering mountain wave and associated downdraft conditions. The obscuration and high/mountainous terrain were related factors.
- [NTSB FTW98LA009](https://openairdocs.org/ntsb/FTW98LA009.md): Cameron N-90 · Albuquerque, NM · Accident · No injuries · Limited investigation · Final report · Oct 10, 1997 · N1602R · 2 aircraft · Substantial damage
  > The failure of the pilot of the Aerostar RX 8, N71415, to follow procedures/directives.
- [NTSB NYC98LA006](https://openairdocs.org/ntsb/NYC98LA006.md): Hiller UH-12C · Bennington, VT · Accident · No injuries · Limited investigation · Final report · Oct 5, 1997 · N49983 · Substantial damage
  > The failure of the cyclic control due to an improper modification by the pilot/owner.
- [NTSB CHI98LA002](https://openairdocs.org/ntsb/CHI98LA002.md): Mikowski Challenger II S · Lake City, MI · Accident · Serious injuries · Limited investigation · Final report · Oct 1, 1997 · N19006 · Destroyed
  > the improper oil to gas mixture in the fuel during refueling and the pilot did not follow the written instructions from the kit manufacturer. Factors contributing to the accident were the pilot could not maintain directional control and the low altitude.
- [NTSB FTW97LA369](https://openairdocs.org/ntsb/FTW97LA369.md): Hughes 369HS · Morgan, UT · Accident · No injuries · Limited investigation · Final report · Sep 30, 1997 · N9102F · Destroyed
  > The pilot's failure to maintain directional control because he exceeded the helicopter's hover performance. A factor was the high density altitude.
- [NTSB CHI97LA306](https://openairdocs.org/ntsb/CHI97LA306.md): Bell 47 · Pipestone, MN · Accident · Serious injuries · Limited investigation · Final report · Sep 30, 1997 · N9005T · Substantial damage
  > the fracture of the pitch control rod assembly.
- [NTSB ANC97FA155](https://openairdocs.org/ntsb/ANC97FA155.md): Cessna 207A · Twin Hills, AK · Accident · 1 fatal · Field investigation · Final report · Sep 26, 1997 · N9984M · Destroyed
  > Improper in-flight planning/decision by the pilot, and his failure to maintain sufficient altitude over mountainous terrain. Factors related to the accident were downdraft conditions, mountainous/hilly terrain, and the use of over-the-counter medications.
- [NTSB ATL97LA136](https://openairdocs.org/ntsb/ATL97LA136.md): Cessna A188B · Zellwood, FL · Accident · Minor injuries · Limited investigation · Final report · Sep 22, 1997 · N53172 · Substantial damage
  > failure of mechanics to adequately torque the crankcase through-bolts following a top overhaul, which subsequently resulted in a crankshaft failure. Soft/uneven terrain in the emergency landing area was a related factor.

Next page: https://openairdocs.org/ntsb-phases/450/cases.md?year=1997&page=2

## 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 year(c."eventDate") = 1997
  AND c."mKey" IN (SELECT case_mkey FROM case_phases WHERE main = 450)
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-phases/450/cases?year=1997

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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.
