# 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 259 of 718 · 35,885 cases

## Cases, newest first

- [NTSB ATL92LA007](https://openairdocs.org/ntsb/ATL92LA007.md): Kaman HH-43B/F · Mt. Vernon, AL · Accident · No injuries · Limited investigation · Final report · Oct 14, 1991 · N55714 · Substantial damage
  > A loss of engine power for undetermined reasons. A factor in the accident was the lack of a suitable landing site.
- [NTSB MIA92LA014](https://openairdocs.org/ntsb/MIA92LA014.md): Bell 47G-5 · La Belle, FL · Accident · No injuries · Limited investigation · Final report · Oct 13, 1991 · N1201W · Substantial damage
  > The pilot in command's improper aft application of cyclic control during an autorotative landing to an open field, resulting in the main rotor blades colliding with the tail boom. Contributing to the accident was the in flight failure of the outer bearing of…
- [NTSB SEA92LA011](https://openairdocs.org/ntsb/SEA92LA011.md): Hughes 369D · Hyder, AK · Accident · Serious injuries · Limited investigation · Final report · Oct 11, 1991 · CGKHR · Substantial damage
  > The failure of the tail rotor hub assembly. Factors include unsuitable terrain, and high vegetation.
- [NTSB MIA92FA012](https://openairdocs.org/ntsb/MIA92FA012.md): Cessna 177 · Green Cove Spgs, FL · Accident · 1 fatal · Field investigation · Final report · Oct 11, 1991 · N3288T · 2 aircraft · Minor damage
  > The pilot in command's failure to maintain a visual lookout.
- [NTSB CHI92LA003](https://openairdocs.org/ntsb/CHI92LA003.md): Cessna 150M · Marion, WI · Accident · No injuries · Limited investigation · Final report · Oct 8, 1991 · N704CW · Substantial damage
  > The failure of the exhaust and intake valves. Factors contributing to the accident were downhill terrain and a collapsed nosegear.
- [NTSB LAX92LA010](https://openairdocs.org/ntsb/LAX92LA010.md): Hill RL Breezy · Buckeye, AZ · Accident · No injuries · Limited investigation · Final report · Oct 7, 1991 · N187JH · Substantial damage
  > A loss of engine power for undetermined reasons.
- [NTSB CHI92LA002](https://openairdocs.org/ntsb/CHI92LA002.md): Piper PA-12 · Roscoe, IL · Accident · Minor injuries · Limited investigation · Final report · Oct 7, 1991 · N2499M · Substantial damage
  > Operation of an aircraft with known deficiencies and deterioration/failure of the magneto(s). Factors related to the accident were: the lack of an annual inspection and non-compliance with an airworthiness directive (AD).
- [NTSB MIA92LA006](https://openairdocs.org/ntsb/MIA92LA006.md): Piper PA-28-140 · Tylertown, MS · Accident · Minor injuries · Limited investigation · Final report · Oct 6, 1991 · N5414S · Substantial damage
  > Oil fouling of the windshield due to a loose engine oil seal. A factor was the pilot's preexisting vision impairment.
- [NTSB MIA92FA004](https://openairdocs.org/ntsb/MIA92FA004.md): Aero Commander 100 · Carrabelle, FL · Accident · 1 fatal · Field investigation · Final report · Oct 5, 1991 · N3673X · Destroyed
  > The non instrument-rated pilot-in-command's decision to continue flight into known instrument meteorological conditions (thunderstorm) and failure to maintain airspeed (vso) while maneuvering. Contributing to the accident was the pilot-in-command's failure to…
- [NTSB FTW92LA001](https://openairdocs.org/ntsb/FTW92LA001.md): Boeing 727-243 · Little Rock, AR · Accident · Serious injuries · Limited investigation · Final report · Oct 5, 1991 · N17402 · No damage
  > The pilot's failure to specifically warn the flight attendants of the hazardous conditions warnings. A factor was the turbulence.
- [NTSB SEA92FA001](https://openairdocs.org/ntsb/SEA92FA001.md): North American Navion · Ola, ID · Accident · 1 fatal · Field investigation · Final report · Oct 4, 1991 · N91577 · Destroyed
  > An incapacitating heart attack while in flight.
- [NTSB MIA92LA010](https://openairdocs.org/ntsb/MIA92LA010.md): Piper PA-32-260 · Vieques, PR · Accident · No injuries · Limited investigation · Final report · Oct 4, 1991 · N563PR · Substantial damage
  > Inadequate aircraft maintenance inspection resulting in the defective muffler which failed and caused an inflight fire.
- [NTSB FTW92LA002](https://openairdocs.org/ntsb/FTW92LA002.md): Beech 35 · Henryetta, OK · Accident · No injuries · Limited investigation · Final report · Oct 4, 1991 · N5944C · Substantial damage
  > Loss of engine power for an unknown reason.
- [NTSB ANC92FA002](https://openairdocs.org/ntsb/ANC92FA002.md): Cessna 172M · Bethel, AK · Accident · No injuries · Field investigation · Final report · Oct 3, 1991 · N20024 · Substantial damage
  > A power loss over unsuitable terrain which resulted in a nose over.
- [NTSB ANC92IA001](https://openairdocs.org/ntsb/ANC92IA001.md): Piper PA-31-350 · Fairbanks, AK · Incident · No injuries · Incident investigation · Final report · Oct 2, 1991 · N200AK · Minor damage
  > Incorrect installation of crankshaft counterwweight rollers by the manufacturer during remanufacture of the engine. Factor was the inadequate surveillance of the engine assembly process by the manufacturer.
- [NTSB MIA92LA001](https://openairdocs.org/ntsb/MIA92LA001.md): Piper PA-28-140 · Brooksville, FL · Accident · Minor injuries · Limited investigation · Final report · Oct 1, 1991 · N6700W · Substantial damage
  > The pilot's inadvertent flight into IMC conditions, and his selection of unsuitable terrain for his attempted precautionary landing.
- [NTSB LAX92LA002](https://openairdocs.org/ntsb/LAX92LA002.md): Cano Avid Flyer · Sonora, CA · Accident · No injuries · Limited investigation · Final report · Oct 1, 1991 · N860CD · Substantial damage
  > Fuel starvation due to vapor lock.
- [NTSB LAX92LA001](https://openairdocs.org/ntsb/LAX92LA001.md): Beech A36TC · Dunsmuir, CA · Accident · Serious injuries · Limited investigation · Final report · Oct 1, 1991 · N140KB · Substantial damage
  > 1) Improper preflight planning by the aircraft owner, 2) failure of the owner to refuel the aircraft, 3) operation of the aircraft by the owner and a mechanic at a known fuel state below the minimum required for takeoff, and 4) failure of the mechanic to…
- [NTSB ANC91LA156](https://openairdocs.org/ntsb/ANC91LA156.md): Aeronca Sedan 15AC · Anchorage, AK · Accident · No injuries · Limited investigation · Final report · Oct 1, 1991 · N1416H · Substantial damage
  > Failure of the pilot to ensure that the fuel caps were secure, which restuled in a fuel leak and subsequent fuel exhaustion.
- [NTSB NYC91LA252](https://openairdocs.org/ntsb/NYC91LA252.md): Cessna 182 · Hadley, MA · Accident · Minor injuries · Limited investigation · Final report · Sep 29, 1991 · N6316A · Destroyed
  > An inflight loss of control due to entanglement of a prematurely deployed parachute in the elevator.
- [NTSB MIA91LA226](https://openairdocs.org/ntsb/MIA91LA226.md): Cessna 172C · Palm Beach, FL · Accident · Minor injuries · Limited investigation · Final report · Sep 28, 1991 · N1669Y · Substantial damage
  > Total loss of engine power due to fuel exhaustion, and failure of the pilot to refuel before departure. Contributing to the accident was the pilot's lack of total experience in becoming lost/disoriented, and operation with known deficiencies in equipment.
- [NTSB FTW91LA167](https://openairdocs.org/ntsb/FTW91LA167.md): Cessna 177B · Lake Charles, LA · Accident · No injuries · Limited investigation · Final report · Sep 28, 1991 · N34980 · Substantial damage
  > The pilot's failure to perform a complete preflight inspection which resulted in a total loss of engine power due to fuel exhaustion as a result of inadequate fuel supply.
- [NTSB FTW91DPG21](https://openairdocs.org/ntsb/FTW91DPG21.md): Joseph P. Frasca Astrocraft · Johnson, AR · Accident · 1 fatal · Final report · Sep 28, 1991 · N999JF · Destroyed
  > The loss of control for unknown reasons, and procedures for emergency equipment not followed, which resulted in parachute separation.
- [NTSB NYC91LA250](https://openairdocs.org/ntsb/NYC91LA250.md): Mitsubishi MU-2B-60 · Utica, NY · Accident · No injuries · Limited investigation · Final report · Sep 27, 1991 · CFFSS · Substantial damage
  > Fatigue cracking of the propeller hub.
- [NTSB MIA91LA225](https://openairdocs.org/ntsb/MIA91LA225.md): Cessna 172H · Atlantic Ocean (Atlantic Ocean) · Accident · Minor injuries · Limited investigation · Final report · Sep 27, 1991 · N2983U · Substantial damage
  > Total loss of engine power due to undetermined reasons.
- [NTSB SEA91LA253](https://openairdocs.org/ntsb/SEA91LA253.md): Cessna 172N · Chiloquin, OR · Accident · No injuries · Limited investigation · Final report · Sep 26, 1991 · N9403E · Substantial damage
  > The loss of engine power in flight due to improper maintenance inspections. A factor relating to the accident was the rough terrain at the accident site.
- [NTSB CHI91LA298](https://openairdocs.org/ntsb/CHI91LA298.md): Taylorcraft BC-12D · Sunset Hills, MO · Accident · No injuries · Limited investigation · Final report · Sep 26, 1991 · N96905 · Substantial damage
  > A blocked fuel system line and inadequate maintenance of the airplane by other maintenance personnel.
- [NTSB SEA91LA249](https://openairdocs.org/ntsb/SEA91LA249.md): Cessna 177 · Snohomish, WA · Accident · No injuries · Limited investigation · Final report · Sep 23, 1991 · N3314T · Substantial damage
  > The separation of the mixture control cable (core) resulting from separation of the adel clamp assembly and improper adjustment by maintenance personnel.
- [NTSB MIA91LA224](https://openairdocs.org/ntsb/MIA91LA224.md): Cessna 150M · San Sebastian, PR · Accident · No injuries · Limited investigation · Final report · Sep 22, 1991 · N704TK · Substantial damage
  > The pilot in command's intentional buzzing and failure to maintain airspeed, resulting in inadvertent stall. During the uncontrolled descent, the airplane collided with and remained suspended in a tree. Contributing to the accident was the ostentatious…
- [NTSB NYC91LA242](https://openairdocs.org/ntsb/NYC91LA242.md): Cessna 180L · Vestal, NY · Accident · No injuries · Limited investigation · Final report · Sep 21, 1991 · N4110 · Substantial damage
  > Improper use of carburetor heat by the pilot which resulted in a power loss due to carburetor ice over unsuitable terrain.
- [NTSB MIA91LA221](https://openairdocs.org/ntsb/MIA91LA221.md): John H. Logan Loganair I · Gainesville, FL · Accident · 2 fatal · Limited investigation · Final report · Sep 21, 1991 · N931JL · Destroyed
  > The non-instrument rated pilot in command's decision to depart under special visual flight rule clearance in instrument flight rules conditions during darkness with a failed vacuum pump and resulting inoperative flight instruments which resulted in an…
- [NTSB LAX91LA402](https://openairdocs.org/ntsb/LAX91LA402.md): Cessna 150M · Buckeye, AZ · Accident · Minor injuries · Limited investigation · Final report · Sep 21, 1991 · N63553 · Destroyed
  > The passenger/certified flight instructor's poor judgement by interfering with the PIC and his failure to execute a timely go-around. Contributing to this accident was the cfi's misjudgment of altitude.
- [NTSB LAX91FA399](https://openairdocs.org/ntsb/LAX91FA399.md): Piper PA-28-181 · Cupertino, CA · Accident · 2 fatal · Field investigation · Final report · Sep 21, 1991 · N8272Y · Destroyed
  > The pilot's failure to maintain the proper altitude, his improper inflight decision to attempt flight below the base of an overcast layer of clouds toward rising mountainous terrain and the flight's inadvertent entry into instrument meteorological conditions.…
- [NTSB ATL91LA177](https://openairdocs.org/ntsb/ATL91LA177.md): Cessna 150G · Pleasant Grove, AL · Accident · Minor injuries · Limited investigation · Final report · Sep 21, 1991 · N4096J · Substantial damage
  > The pilot's failure to refuel the airplane prior to the last takeoff resulting in an inadequate fuel supply for the flight.
- [NTSB NYC91LA241](https://openairdocs.org/ntsb/NYC91LA241.md): Robinson R22B · Wexford, PA · Accident · No injuries · Limited investigation · Final report · Sep 20, 1991 · N2289K · Substantial damage
  > The pilot's improper procedures during a practice autorotation, and selection of unsuitable terrain. Contributing to the accident was a loss of engine power for undetermined reasons, at a low altitude.
- [NTSB LAX91LA400](https://openairdocs.org/ntsb/LAX91LA400.md): Piper PA-24-250 · French Gulch, CA · Accident · No injuries · Limited investigation · Final report · Sep 20, 1991 · N6414P · Substantial damage
  > The pilot's failure to refuel before departing on the accident flight. Contributing to this accident was the high vegetation and fuel exhaustion.
- [NTSB SEA91LA247](https://openairdocs.org/ntsb/SEA91LA247.md): Piper PA-24-250 · Arco, ID · Accident · No injuries · Limited investigation · Final report · Sep 19, 1991 · N7985P · Substantial damage
  > Water in the fuel tank and the inability of the pilot to flare for landing after maneuvering to avoid transmission lines in his flight path during the forced landing.
- [NTSB NYC91FA239](https://openairdocs.org/ntsb/NYC91FA239.md): Convair CV-580 · Belvedere Ctr, VT · Accident · 2 fatal · Field investigation · Final report · Sep 19, 1991 · CFICA · Destroyed
  > Failure of the first officer (co-pilot) to maintain control of the aircraft after becoming spatially disoriented, and his exceeding the design stress limits of the aircraft. Factors related to the accident were: the lack of two pilots in the cockpit,…
- [NTSB NYC91LA240](https://openairdocs.org/ntsb/NYC91LA240.md): Piper PA-22 · Slippery Rock, PA · Accident · Minor injuries · Limited investigation · Final report · Sep 18, 1991 · N9741D · Substantial damage
  > The on ground collision with a farm vehicle during landing roll out.
- [NTSB BFO92DOA01](https://openairdocs.org/ntsb/BFO92DOA01.md): Piper PA-28-181 · Belington, WV · Accident · 1 fatal · Final report · Sep 18, 1991 · N2126P · Destroyed
  > The pilot's failure to maintain clearance above the terrain which resulted in inflight collision with the terrain. Contributing was mountainous terrain.
- [NTSB SEA91LA242](https://openairdocs.org/ntsb/SEA91LA242.md): Aeronca 7DC · Yellow Pine, ID · Accident · Serious injuries · Limited investigation · Final report · Sep 17, 1991 · N9654H · Destroyed
  > Improper inflight planning/decision by the pilot, which resulted in inadvertent flight into a box canyon and subsequent collision with trees, when there was insufficient space to reverse course and the aircraft would not outclimb rising terrain. The terrain…
- [NTSB SEA91LA240](https://openairdocs.org/ntsb/SEA91LA240.md): Piper PA-28-161 · Ellensburg, WA · Accident · No injuries · Limited investigation · Final report · Sep 16, 1991 · N514PU · Substantial damage
  > The pilot's failure to maintain terrain clearance. Contributing to the accident was the pilot's overconfidence in the aircraft's ability, and flight in a box canyon where remedial action was not possible.
- [NTSB MIA91LA219](https://openairdocs.org/ntsb/MIA91LA219.md): Air Tractor AT-401 · Sumner, MS · Accident · Minor injuries · Limited investigation · Final report · Sep 16, 1991 · N1004W · Substantial damage
  > Failure of the no. 1 cylinder assembly.
- [NTSB DEN91FA130](https://openairdocs.org/ntsb/DEN91FA130.md): Cessna 182G · Elida, NM · Accident · 3 fatal · Field investigation · Final report · Sep 16, 1991 · N3223S · Destroyed
  > The pilot's improper preflight planning/preparation for the flight and his subsequent flight into instrument meteorological conditions. A factor was: heavy fog and low ceiling.
- [NTSB ANC91LA148](https://openairdocs.org/ntsb/ANC91LA148.md): Cessna 180 · Telida, AK · Accident · No injuries · Limited investigation · Final report · Sep 16, 1991 · N9640B · Substantial damage
  > The pilot getting disoriented during flight due to his inattentiveness, the airplane's low fuel level, the fss specialist's giving the pilot an incorrect heading to fly, poor radio communications between the fss and the pilot, the strong crosswind, and the…
- [NTSB LAX91LA395](https://openairdocs.org/ntsb/LAX91LA395.md): Piper PA-24-260 · Tehachapi, CA · Accident · No injuries · Limited investigation · Final report · Sep 15, 1991 · N8888P · Substantial damage
  > Fuel exhaustion due to improper inflight planning.
- [NTSB ATL91LA175](https://openairdocs.org/ntsb/ATL91LA175.md): Cessna 172K · Greeneville, TN · Accident · No injuries · Limited investigation · Final report · Sep 15, 1991 · N78239 · 2 aircraft · Substantial damage
  > The inadequate visual lookout by the pilot of N78239, and his failure to accurately judge the distance between the two aircraft. Factors in the accident were the dark night conditions and the resulting visual perception of aircraft lighting in dark conditions.
- [NTSB CHI91LA300](https://openairdocs.org/ntsb/CHI91LA300.md): ATR ATR 42-300 · Muskegon, MI · Accident · Serious injuries · Limited investigation · Final report · Sep 14, 1991 · N243AT · No damage
  > The failure, for reasons unknown, of the number four bearing in the high pressure spool of the engine.
- [NTSB NYC91FA235](https://openairdocs.org/ntsb/NYC91FA235.md): Piper PA38-112 · Akron, OH · Accident · 1 fatal · Field investigation · Final report · Sep 12, 1991 · N9302T · Destroyed
  > The pilot lost control of the airplane and inadvertently stalled and spun the airplane at too low an altitude to allow recovery. Factors related to the accident were; the pilot's improper preflight and planning, which resulted in fuel exhaustion, a loss of…
- [NTSB DEN91LA129](https://openairdocs.org/ntsb/DEN91LA129.md): Cessna 152 · Stillwater, OK · Accident · Minor injuries · Limited investigation · Final report · Sep 12, 1991 · N93151 · Substantial damage
  > Power loss due to fuel exhaustion and the pilot's failure to refuel. A factor was: the rough uneven terrain.

Next page: https://openairdocs.org/ntsb-phases/400/cases.md?page=260

## 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=259

---
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.