# NTSB investigations: Landing

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 219 of 1,075 · 53,703 cases

## Cases, newest first

- [NTSB ANC04LA039](https://openairdocs.org/ntsb/ANC04LA039.md): Piper PA-18-150 · Fairbanks, AK · Accident · No injuries · Limited investigation · Final report · Apr 11, 2004 · N1755P · Substantial damage
  > The student pilot's loss of directional control during the landing roll, which resulted in the airplane entering deep snow alongside the runway, and nosing over.
- [NTSB SEA04LA067](https://openairdocs.org/ntsb/SEA04LA067.md): Champion 7ECA · Hardin, MT · Accident · No injuries · Limited investigation · Final report · Apr 10, 2004 · N5235X · Substantial damage
  > The pilot's failure to perform a go-around. Contributing factors were the pilot's misjudgment of speed and distance and the tree.
- [NTSB NYC04CA104](https://openairdocs.org/ntsb/NYC04CA104.md): Cessna 172N · Bridgeport, CT · Accident · No injuries · Data collection · Final report · Apr 10, 2004 · N6583D · Substantial damage
  > The pilot's inadequate compensation for wind conditions and his failure to maintain aircraft control which resulted in a hard landing. A factor was the gusty winds.
- [NTSB NYC04CA102](https://openairdocs.org/ntsb/NYC04CA102.md): Cessna 172P · Westfield, MA · Accident · No injuries · Data collection · Final report · Apr 9, 2004 · N5425K · Substantial damage
  > The student pilot's improper flare and his failure to maintain aircraft control while landing.
- [NTSB FTW04CA107](https://openairdocs.org/ntsb/FTW04CA107.md): Ayres S2R-T34 · Friona, TX · Accident · No injuries · Data collection · Final report · Apr 8, 2004 · N2320T · Substantial damage
  > The pilot's failure to maintain directional control during landing roll. Contributing factors were prevailing crosswind, rain, and the restricted vision from water on the windscreen, and a vehicle parked near the runway.
- [NTSB ATL04LA092](https://openairdocs.org/ntsb/ATL04LA092.md): Cessna 140 · Greenville, SC · Accident · No injuries · Limited investigation · Final report · Apr 8, 2004 · N527ST · Substantial damage
  > Fatigue failure of the leaf spring gear strut.
- [NTSB ANC04LA038](https://openairdocs.org/ntsb/ANC04LA038.md): Grumman G21 · Unalaska, AK · Accident · No injuries · Limited investigation · Final report · Apr 5, 2004 · N22932 · Substantial damage
  > The inadvertent ground loop/swerve by the second pilot during the landing roll, and the first (check) pilot's inadequate supervision of the second pilot, which resulted in a loss of control and substantial damage to the airplane. Factors associated with the…
- [NTSB CHI04CA102](https://openairdocs.org/ntsb/CHI04CA102.md): Schweizer SGS 2-33A · Lake Village, IN · Accident · No injuries · Data collection · Final report · Apr 4, 2004 · N17882 · Substantial damage
  > The unsuitable terrain the Certified Flight Instructor encountered during the off-field landing. The low altitude, the downdraft or "sink" experienced during flight, and the soft terrain conditions were factors to the accident.
- [NTSB FTW04LA102](https://openairdocs.org/ntsb/FTW04LA102.md): Waco RBA · Temple, TX · Accident · No injuries · Limited investigation · Final report · Apr 3, 2004 · N12444 · Substantial damage
  > The pilot's failure to maintain directional control during the landing roll. A contributing factor was the locked wheel.
- [NTSB CHI04LA097](https://openairdocs.org/ntsb/CHI04LA097.md): Cessna 172R · Kalamazoo, MI · Accident · No injuries · Limited investigation · Final report · Apr 2, 2004 · N986AV · Substantial damage
  > The air traffic control procedures/directives not followed by tower air traffic controller, the inadequate compensation for wind conditions by the student pilot during landing, the lack of total experience by the student pilot, and the recommended crosswind…
- [NTSB SEA04LA061](https://openairdocs.org/ntsb/SEA04LA061.md): Cessna 305A · Bozeman, MT · Accident · No injuries · Limited investigation · Final report · Mar 31, 2004 · N5210G · Substantial damage
  > The pilot's failure to maintain directional control during the landing roll in the tail wheel-equipped aircraft, leading to an inadvertent ground-loop, during which the aircraft's wing impacted the ground.
- [NTSB CHI04CA094](https://openairdocs.org/ntsb/CHI04CA094.md): Cessna 180 · Long Lake, WI · Accident · No injuries · Data collection · Final report · Mar 31, 2004 · N223WH · Substantial damage
  > The pilot flared improperly and failed to maintain directional control during landing.
- [NTSB NYC04LA173](https://openairdocs.org/ntsb/NYC04LA173.md): Piper PA-28R-200 · Factoryville, PA · Accident · No injuries · Limited investigation · Final report · Mar 29, 2004 · N2613R · Substantial damage
  > An encounter with a deer, as reported by the pilot. A factor in this accident was the muddy grass off the left side of the runway.
- [NTSB FTW04LA100](https://openairdocs.org/ntsb/FTW04LA100.md): Murphy Glasair III · Weatherford, TX · Accident · Minor injuries · Limited investigation · Final report · Mar 29, 2004 · N119JM · Substantial damage
  > The pilot's misjudgment of the runway distance due to his misperception of his location point on the runway.
- [NTSB NYC04CA097](https://openairdocs.org/ntsb/NYC04CA097.md): Cessna 182T · Perkasie, PA · Accident · No injuries · Data collection · Final report · Mar 28, 2004 · N182VM · Substantial damage
  > The pilots' inadequate compensation for winds and his failure to maintain directional control during landing. A factor related to the accident was the gusting wind conditions.
- [NTSB LAX04LA174](https://openairdocs.org/ntsb/LAX04LA174.md): Mitsubishi MU-2B-26A · La Verne, CA · Accident · No injuries · Limited investigation · Final report · Mar 27, 2004 · N81MF · Substantial damage
  > the pilot's failure to adequately compensate for an asymmetrical thrust condition and to maintain directional control during the landing flare. The owner/pilot's failure to comply with the applicable service bulletin concerning propeller/power control rigging…
- [NTSB FTW04CA098](https://openairdocs.org/ntsb/FTW04CA098.md): Stinson 108-1 · Slidell, LA · Accident · No injuries · Data collection · Final report · Mar 27, 2004 · N8755K · Substantial damage
  > the pilot's failure to compensate for the gusty wind conditions and maintain control of the airplane while landing.
- [NTSB SEA04CA059](https://openairdocs.org/ntsb/SEA04CA059.md): Rockwell S-2R · Mattawa, WA · Accident · No injuries · Data collection · Final report · Mar 26, 2004 · N8420V · Substantial damage
  > Compensation for wind conditions not maintained. Factors include a tailwind and a rock pile adjacent to the runway.
- [NTSB FTW04LA099](https://openairdocs.org/ntsb/FTW04LA099.md): Grumman G-164B · Mamou, LA · Accident · No injuries · Limited investigation · Final report · Mar 26, 2004 · N8276K · Substantial damage
  > The pilot's delay in aborting the landing. A contributing factor included the entrance of a crawfish boat onto the airstrip.
- [NTSB NYC04CA094](https://openairdocs.org/ntsb/NYC04CA094.md): Piper PA-28-181 · Louisville, KY · Accident · No injuries · Data collection · Final report · Mar 25, 2004 · N340PA · Substantial damage
  > The student pilot's failure to maintain directional control while landing, and the CFI's delayed remedial action. A factor related to the accident was the gusting wind conditions.
- [NTSB NYC04CA091](https://openairdocs.org/ntsb/NYC04CA091.md): Piper PA-28-180 · Norwood, MA · Accident · No injuries · Data collection · Final report · Mar 24, 2004 · N6535J · Substantial damage
  > The student pilot failure to recover from a bounced landing. A factor in this accident was the student pilot's lack of solo flight experience.
- [NTSB ANC04LA036](https://openairdocs.org/ntsb/ANC04LA036.md): Stinson 108-2 · Levelock, AK · Accident · No injuries · Limited investigation · Final report · Mar 23, 2004 · N97124 · Substantial damage
  > The pilot's selection of unsuitable terrain for landing, which resulted in an overrun. Factors contributing to the accident were the pilot's inadequate weather evaluation, a tailwind, and a slippery, ice-covered landing surface.
- [NTSB SEA04LA053](https://openairdocs.org/ntsb/SEA04LA053.md): Cessna 172E · Raymond, WA · Accident · No injuries · Limited investigation · Final report · Mar 21, 2004 · N3950S · Substantial damage
  > The pilot's failure to maintain directional control during the landing roll resulting in the aircraft nosing over. Incorrect remedial action and soft terrain were factors.
- [NTSB DEN04CA054](https://openairdocs.org/ntsb/DEN04CA054.md): Cessna T310R · Broomfield, CO · Accident · No injuries · Data collection · Final report · Mar 21, 2004 · N3465G · Substantial damage
  > the pilot's improper in-flight planning/decision and his failure to verify the landing gear position. Factors contributing to the accident were the pilot's diverted attention due to the electrical failure.
- [NTSB CHI04CA093](https://openairdocs.org/ntsb/CHI04CA093.md): Beech F33A · Wahoo, NE · Accident · No injuries · Data collection · Final report · Mar 21, 2004 · N3077H · Substantial damage
  > The pilot's improper recovery from the bounced landing resulting in the collapse of the nose landing gear. A factor was the pilot's misjudged landing flare.
- [NTSB CHI04CA088](https://openairdocs.org/ntsb/CHI04CA088.md): Cessna 172A · Springfield, MO · Accident · Minor injuries · Data collection · Final report · Mar 21, 2004 · N7265T · Substantial damage
  > The pilot failed to initiate a go-around and the airplane porpoised during the hard landing. Factors associated with the accident were the excessive groundspeed and the overload failure of the nose gear.
- [NTSB ANC04LA037](https://openairdocs.org/ntsb/ANC04LA037.md): Piper PA-31T3 · Kaktovik, AK · Accident · No injuries · Limited investigation · Final report · Mar 21, 2004 · N223CS · Substantial damage
  > The pilot's selection of unsuitable terrain for landing, which resulted in the airplane colliding with drifted snow during the landing roll. Factors contributing to the accident were a snow covered runway, airport personnel's failure to remove accumulated…
- [NTSB SEA04LA069](https://openairdocs.org/ntsb/SEA04LA069.md): Bellanca 7GCBC · Marion, MT · Accident · No injuries · Limited investigation · Final report · Mar 20, 2004 · N90076 · Substantial damage
  > The pilot's failure to maintain directional control during the landing roll. Contributing factors were the gust of wind and the snowbank.
- [NTSB NYC04CA089](https://openairdocs.org/ntsb/NYC04CA089.md): Cessna 172P · Zelienople, PA · Accident · No injuries · Data collection · Final report · Mar 20, 2004 · N62058 · Substantial damage
  > The pilot's improper recovery from a bounced landing.
- [NTSB FTW04LA095](https://openairdocs.org/ntsb/FTW04LA095.md): Piper PA-30 · Galveston, TX · Accident · No injuries · Limited investigation · Final report · Mar 16, 2004 · N572AS · Substantial damage
  > The pilot's failure to maintain directional control during the landing roll. A factor was the pilot's failure to evaluate the wind, prior to landing downwind.
- [NTSB CHI04LA086](https://openairdocs.org/ntsb/CHI04LA086.md): Beech 1900D · Manhattan, KS · Accident · No injuries · Limited investigation · Final report · Mar 15, 2004 · N155ZV · Substantial damage
  > The captain's improper decision due to his attempt to taxi back onto the runway after coming to a stop in the grass, and the resulting collapse of nose landing gear. Contributing factors were the inoperative nose wheel steering, the pilot's inability to…
- [NTSB SEA04LA055](https://openairdocs.org/ntsb/SEA04LA055.md): Lake LA-4-200 · Cusick, WA · Accident · No injuries · Limited investigation · Final report · Mar 14, 2004 · N65675 · Substantial damage
  > The pilot's failure to adequately compensate for crosswind conditions and his failure to maintain proper alignment in the direction of landing during the touchdown portion of a water landing on a river. Factors include crosswind conditions.
- [NTSB NYC04LA087](https://openairdocs.org/ntsb/NYC04LA087.md): Cessna 172L · Turner, ME · Accident · Minor injuries · Limited investigation · Final report · Mar 14, 2004 · N7872G · Substantial damage
  > The pilot's misjudgment of speed/distance and the delayed aborted landing. A factor in this accident was the tail wind condition.
- [NTSB LAX04CA155](https://openairdocs.org/ntsb/LAX04CA155.md): Jerry Garrison Christen Eagle II · Hollister, CA · Accident · No injuries · Data collection · Final report · Mar 13, 2004 · N796L · Substantial damage
  > the pilot's failure to obtain proper runway alignment and maintain clearance from a sign due to his inadequate visual lookout. Factors in the accident were crosswind conditions.
- [NTSB CHI04LA087](https://openairdocs.org/ntsb/CHI04LA087.md): Piper PA-28R-200 · Peru, IL · Accident · No injuries · Limited investigation · Final report · Mar 13, 2004 · N15118 · Substantial damage
  > The inadvertent landing gear retraction by the dual student during the landing roll.
- [NTSB ATL04LA084](https://openairdocs.org/ntsb/ATL04LA084.md): Maule MX-7-180A · Plains, GA · Accident · No injuries · Limited investigation · Final report · Mar 13, 2004 · N3179U · Substantial damage
  > The pilot's misjudgment of the speed/distance/altitude which resulted in a overrun of the runway.
- [NTSB ANC04LA030](https://openairdocs.org/ntsb/ANC04LA030.md): Cessna 180 · Chugiak, AK · Accident · No injuries · Limited investigation · Final report · Mar 12, 2004 · N7937V · Substantial damage
  > The pilot's inadequate compensation for a crosswind condition during the landing roll, which resulted in a loss of control, and an on ground collision with a snow bank. A factor associated with the accident was a crosswind.
- [NTSB MIA04IA056](https://openairdocs.org/ntsb/MIA04IA056.md): Airbus Industrie A300F4-605R · Fort Lauderdale, FL · Incident · No injuries · Incident investigation · Final report · Mar 11, 2004 · N682FE · Minor damage
  > The flight crews' inadvertent setting of the parking brake during flight resulting in the airplane being landed with the parking brake set and failure of all 8 main landing gear tires during the landing rollout.
- [NTSB LAX04CA160](https://openairdocs.org/ntsb/LAX04CA160.md): Cessna C195A · Gila Bend, AZ · Accident · No injuries · Data collection · Final report · Mar 11, 2004 · N9869A · Substantial damage
  > the pilot's failure to maintain directional control, resulting in a ground loop. Factors in the accident were the pilot's unfamiliarity with the airplane and the delayed remedial action of the flight instructor.
- [NTSB SEA04LA056](https://openairdocs.org/ntsb/SEA04LA056.md): Cessna R182 · Bremerton, WA · Accident · No injuries · Limited investigation · Final report · Mar 10, 2004 · N7362X · Substantial damage
  > The pilot's failure to maintain directional control which resulted in a loss of control and subsequent wing strike with terrain. A contributing factor was the soft terrain.
- [NTSB NYC04CA085](https://openairdocs.org/ntsb/NYC04CA085.md): Diamond Aircraft Industries DA-40 · Bardstown, KY · Accident · No injuries · Data collection · Final report · Mar 10, 2004 · N316MA · Substantial damage
  > The pilot's failure to attain the proper touchdown point, and his failure to maintain directional control during landing.
- [NTSB LAX04LA149](https://openairdocs.org/ntsb/LAX04LA149.md): Cessna 402A · Peach Springs, AZ · Accident · No injuries · Limited investigation · Final report · Mar 9, 2004 · N99AT · Substantial damage
  > the pilot's inadequate flare and touchdown that imparted high side loadings on the right main landing gear, which resulted in an overload failure of the landing gear bellcrank and the collapse of that gear.
- [NTSB DEN04LA051](https://openairdocs.org/ntsb/DEN04LA051.md): Shook Rans S-12 · Berthoud, CO · Accident · No injuries · Limited investigation · Final report · Mar 8, 2004 · N7138K · Substantial damage
  > the pilot's improper flare and his inadequate compensation for wind. The wind gust was a contributing factor.
- [NTSB NYC04CA084](https://openairdocs.org/ntsb/NYC04CA084.md): Cessna 172S · Stevensville, MD · Accident · No injuries · Data collection · Final report · Mar 7, 2004 · N317ME · Substantial damage
  > The student pilot's failure to maintain aircraft control while landing. A factor was the student pilot's lack of experience.
- [NTSB DEN04LA049](https://openairdocs.org/ntsb/DEN04LA049.md): Cessna 182P · Hanksville, UT · Accident · No injuries · Limited investigation · Final report · Mar 7, 2004 · N29821 · Substantial damage
  > the pilot's selection of unsuitable terrain to conduct a precautionary landing. Factors contributing to the accident was the soft, dirt road.
- [NTSB ATL04LA081](https://openairdocs.org/ntsb/ATL04LA081.md): Cessna 182P · Nashville, TN · Accident · No injuries · Limited investigation · Final report · Mar 7, 2004 · N325LA · Substantial damage
  > The pilot's improper landing flare and his inadequate recovery from a bounced landing resulting in a hard landing and propeller strike of the runway.
- [NTSB ATL04LA080](https://openairdocs.org/ntsb/ATL04LA080.md): Maule MX-7-235 · Nashville, TN · Accident · No injuries · Limited investigation · Final report · Mar 7, 2004 · N5655P · Substantial damage
  > The pilot's inadequate compensation for wind and his failure to maintain aircraft control which resulted in a hard landing. The pilot's decision to land in wind conditions that exceeded the demonstrated crosswind component, wind gusts, and a crosswind were…
- [NTSB MIA04CA057](https://openairdocs.org/ntsb/MIA04CA057.md): Beech V35B · Bay St. Louis, MS · Accident · No injuries · Data collection · Final report · Mar 6, 2004 · N4010A · Substantial damage
  > The failure of the pilot to complete the landing checklist and extend the landing gear resulting in a gear up landing and damage to the airplane.
- [NTSB LAX04LA151](https://openairdocs.org/ntsb/LAX04LA151.md): Piper PA-28-180 · Reno, NV · Accident · No injuries · Limited investigation · Final report · Mar 6, 2004 · N6367J · Substantial damage
  > the pilot's premature flare and failure to maintain adequate airspeed resulted in an inadvertent stall and a hard landing, which collapsed the landing gear.
- [NTSB LAX04CA146](https://openairdocs.org/ntsb/LAX04CA146.md): Robinson R22 Beta · Long Beach, CA · Accident · Minor injuries · Data collection · Final report · Mar 6, 2004 · N7188S · Substantial damage
  > the student pilot's improper use of the cyclic control and the certified flight instructor's inadequate supervision, which resulted in a rollover.

Next page: https://openairdocs.org/ntsb-phases/550/cases.md?page=220

## 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 = 550)
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-phases/550/cases?page=219

---
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.
