# NTSB investigations: Approach

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 113 of 420 · 20,992 cases

## Cases, newest first

- [NTSB NYC98LA125](https://openairdocs.org/ntsb/NYC98LA125.md): Beech BE 65-80 · Malone, NY · Accident · Serious injuries · Limited investigation · Final report · Jun 5, 1998 · N215AB · Destroyed
  > The pilot's failure to follow emergency procedures, and his failure to maintain control of the airplane after a loss of power from one engine. Factors include fuel filter blockage, inadequate maintenance, and the pilot's lack of experience in multi-engine…
- [NTSB CHI98LA181](https://openairdocs.org/ntsb/CHI98LA181.md): Piper PA-28R-200 · Sikesville, MO · Accident · Minor injuries · Limited investigation · Final report · May 31, 1998 · N9324N · Substantial damage
  > the deer which ran in front of the airplane during the landing flare. Factors associated with the accident were the inadequate airspeed which resulted in the pilot not being able to maintain directional control of the airplane as he attempted to avoid deer,…
- [NTSB ANC98LA060](https://openairdocs.org/ntsb/ANC98LA060.md): Cessna U206 · Fairbanks, AK · Accident · No injuries · Limited investigation · Final report · May 30, 1998 · N414UJ · Substantial damage
  > The pilot's inadequate compensation for wind conditions. Factors associated with the accident are variable winds, and windshear.
- [NTSB ANC98TA062](https://openairdocs.org/ntsb/ANC98TA062.md): Cessna 185 · Kotzebue, AK · Accident · Minor injuries · Final report · May 29, 1998 · N4761Q · Substantial damage
  > The instructor pilot's inadequate compensation for wind conditions. A factor associated with this accident was a downdraft prior to touchdown.
- [NTSB FTW98LA247](https://openairdocs.org/ntsb/FTW98LA247.md): Cessna 150G · Claremore, OK · Accident · Minor injuries · Limited investigation · Final report · May 28, 1998 · N6256S · Substantial damage
  > The pilot's failure to maintain obstacle clearance.
- [NTSB MIA98LA171](https://openairdocs.org/ntsb/MIA98LA171.md): Beech 95 · Jacksonville, FL · Accident · Minor injuries · Limited investigation · Final report · May 27, 1998 · N2705Y · Substantial damage
  > The pilot's failure to maintain airspeed (VSO) on final approach resulting in an inadvertent stall.
- [NTSB FTW98LA245](https://openairdocs.org/ntsb/FTW98LA245.md): Cessna 320B · Rockport, TX · Accident · No injuries · Limited investigation · Final report · May 27, 1998 · N986J · Substantial damage
  > The pilot's failure to maintain airspeed during a go around which resulted in an inadvertent stall. Factors were the pilot's lack of experience in the make and model aircraft, his failure to follow the before landing checklist, and his improper use of the…
- [NTSB MIA98LA168](https://openairdocs.org/ntsb/MIA98LA168.md): Gulfstream American 690C · Jacksonville, FL · Accident · No injuries · Limited investigation · Final report · May 26, 1998 · N840V · Substantial damage
  > the left main landing gear failed to extend due to a jammed link assembly.
- [NTSB NYC98LA119](https://openairdocs.org/ntsb/NYC98LA119.md): Piper PA-32-300 · Hanover, PA · Accident · No injuries · Limited investigation · Final report · May 25, 1998 · N43108 · Substantial damage
  > failure of the pilot to obtain current information for the divert airfield, and his selection of an unsuitable area for landing. Related factors included: the lower ambient light conditions at dusk, construction on the airfield, and an over-reliance on the…
- [NTSB NYC98GA113](https://openairdocs.org/ntsb/NYC98GA113.md): Cessna 182R · Middleborough, MA · Accident · 2 fatal · Final report · May 25, 1998 · N9885E · Destroyed
  > The pilot-in-command's failure to maintain control of the airplane during a VFR go-around. A factor was the impairment due to drugs.
- [NTSB SEA98LA082](https://openairdocs.org/ntsb/SEA98LA082.md): Cessna 150L · Sandpoint, ID · Accident · Serious injuries · Limited investigation · Final report · May 24, 1998 · N1479Q · Substantial damage
  > Loss of consciousness by the pilot-in-command/flight instructor, resulting in loss of aircraft control and subsequent collision with terrain.
- [NTSB FTW98LA241](https://openairdocs.org/ntsb/FTW98LA241.md): Mader WAG-AERO 2+2 · Hurricane, UT · Accident · No injuries · Limited investigation · Final report · May 24, 1998 · N6272A · Substantial damage
  > An encounter with high vegetation and unsuitable terrain during a forced landing. A factor was a partial failure of the engine's exhaust stack during flight.
- [NTSB ANC98LA055](https://openairdocs.org/ntsb/ANC98LA055.md): Douglas DC-3C · Anchorage, AK · Accident · Minor injuries · Limited investigation · Final report · May 24, 1998 · N67588 · Substantial damage
  > The pilot's inadequate in-flight planning/decision which resulted in fuel exhaustion and subsequent loss of engine power. A related factor was the soft, marshy terrain at the forced landing area.
- [NTSB NYC98FA111](https://openairdocs.org/ntsb/NYC98FA111.md): Piper PA-28RT-201 · Lincoln, MA · Accident · 2 fatal · Field investigation · Final report · May 23, 1998 · N82824 · Destroyed
  > The pilot's failure to maintain airspeed.
- [NTSB LAX98LA168](https://openairdocs.org/ntsb/LAX98LA168.md): Cessna T210M · Santa Barbara, CA · Accident · No injuries · Limited investigation · Final report · May 20, 1998 · N6056B · Destroyed
  > The pilot's mismangement of the fuel by the improper position of the fuel tank selector.
- [NTSB SEA98FA078](https://openairdocs.org/ntsb/SEA98FA078.md): Piper PA-31T1 · Great Falls, MT · Accident · 2 fatal · Field investigation · Final report · May 19, 1998 · N121BE · Destroyed
  > The flight crew's failure to maintain aircraft control.
- [NTSB LAX98LA164](https://openairdocs.org/ntsb/LAX98LA164.md): Piper PA-28R-201 · Hollister, CA · Accident · No injuries · Limited investigation · Final report · May 17, 1998 · N36574 · 2 aircraft · Substantial damage
  > The failure of the instructors and dual students in both aircraft to maintain an adequate visual lookout, which resulted in their combined failures to see and avoid each other. Inadequate supervision of the two flights by the respective instructor pilots were…
- [NTSB FTW98LA224](https://openairdocs.org/ntsb/FTW98LA224.md): Mooney M20F · Telluride, CO · Accident · No injuries · Limited investigation · Final report · May 17, 1998 · N6444Q · Substantial damage
  > The pilot exceeded the crosswind capability performance of the aircraft, and his delayed response in initiating a go around. Factors were gusty, crosswind and tailwind conditions, and high density altitude.
- [NTSB FTW98LA223](https://openairdocs.org/ntsb/FTW98LA223.md): AS+ AC-4 · Cedar Fort, UT · Accident · Serious injuries · Limited investigation · Final report · May 16, 1998 · N158R · Destroyed
  > Failure by the pilot to maintain control of the aircraft. A factor was lack of experience in make and model.
- [NTSB LAX98LA157](https://openairdocs.org/ntsb/LAX98LA157.md): Piper PA-22-160 · Clarksburg, CA · Accident · Minor injuries · Limited investigation · Final report · May 15, 1998 · N198TP · Substantial damage
  > A total loss of engine power for undetermined non-mechanical reasons. A contributing factor in the landing nose-over was the presence of the soft terrain.
- [NTSB MIA98FA162](https://openairdocs.org/ntsb/MIA98FA162.md): Taylorcraft BC-12D · Mccalla, AL · Accident · 1 fatal · Field investigation · Final report · May 14, 1998 · N96750 · Substantial damage
  > The pilot's failure to maintain airspeed, which resulted in a stall.
- [NTSB IAD98LA053](https://openairdocs.org/ntsb/IAD98LA053.md): Cessna 310Q · Nashua, NH · Accident · Serious injuries · Limited investigation · Final report · May 11, 1998 · N7795Q · Destroyed
  > The pilot's improper fuel management which led to fuel starvation.
- [NTSB CHI98LA144](https://openairdocs.org/ntsb/CHI98LA144.md): Cessna 170A · Emily, MN · Accident · Minor injuries · Limited investigation · Final report · May 10, 1998 · N1491D · Substantial damage
  > The pilot's failure to maintain the proper rate of descent on final. A factor was the vegetation (bushes).
- [NTSB ATL98LA074](https://openairdocs.org/ntsb/ATL98LA074.md): Piper PA-30 · Hendersonville, NC · Accident · Minor injuries · Limited investigation · Final report · May 8, 1998 · N7312Y · Substantial damage
  > The pilot's failure to attain the proper touchdown point and improper go-around procedures resulting in collision with wires, trees, and the ground. Factors were the pilot's lack of familiarity with the airplane and the short runway.
- [NTSB SEA98LA068](https://openairdocs.org/ntsb/SEA98LA068.md): Piper PA-28-160 · Monroe, WA · Accident · No injuries · Limited investigation · Final report · May 1, 1998 · N5157W · Substantial damage
  > Fuel starvation due to the flight instructor's improper in-flight decision to simulate an engine failure by pulling the mixture control toward the lean position until the engine shut down, and his failure to return the mixture to the rich position until after…
- [NTSB LAX98FA149](https://openairdocs.org/ntsb/LAX98FA149.md): Robinson R22 · Irwindale, CA · Accident · 1 fatal · Field investigation · Final report · May 1, 1998 · N8365D · Destroyed
  > The failure of the pilot to observe in a timely manner and maintain clearance from electrical power transmission wires and her improper maneuver to avoid the obstruction.
- [NTSB ATL98LA067](https://openairdocs.org/ntsb/ATL98LA067.md): Unknown Freebird Sport · Englewood, FL · Accident · 1 fatal · Limited investigation · Final report · Apr 26, 1998 · UNREG · Destroyed
  > The inadvertent aerodynamic stall, and subsequent loss of control in-flight by the non-certificated pilot. A factor was the use of over the counter drugs which are known to cause drowsiness.
- [NTSB LAX98LA148](https://openairdocs.org/ntsb/LAX98LA148.md): Cessna 150G · Oroville, CA · Accident · No injuries · Limited investigation · Final report · Apr 25, 1998 · N3376J · Substantial damage
  > The pilot's failure to maintain the proper glide path, and his inadequate compensation for wind conditions, which resulted in an undershoot.
- [NTSB FTW98LA198](https://openairdocs.org/ntsb/FTW98LA198.md): Cessna 172N · Parker, CO · Accident · No injuries · Limited investigation · Final report · Apr 25, 1998 · N6356D · Substantial damage
  > a fractured #1 exhaust valve rocker arm stud, which subsequently resulted in loss of engine power and a forced landing. The lack of suitable terrain in the forced landing area was a related factor.
- [NTSB FTW98LA193](https://openairdocs.org/ntsb/FTW98LA193.md): Lerille P & W 1937 · Lafayette, LA · Accident · Serious injuries · Limited investigation · Final report · Apr 25, 1998 · N546R · Substantial damage
  > The fuel exhaustion due to the pilot's failure to refuel. A factor was the lack of suitable terrain for the forced landing.
- [NTSB CHI98LA135](https://openairdocs.org/ntsb/CHI98LA135.md): Cessna C-182 · Emporia, KS · Accident · No injuries · Limited investigation · Final report · Apr 25, 1998 · N5305B · Substantial damage
  > The pilot's failure to maintain control of the airplane. Factors contributing to this accident were the strong crosswind and the wind gusts.
- [NTSB CHI98LA134](https://openairdocs.org/ntsb/CHI98LA134.md): Cessna 172 · Eagle River, WI · Accident · No injuries · Limited investigation · Final report · Apr 25, 1998 · N79006 · Substantial damage
  > the pilot failed to compensate for the wind conditions, improperly executed a go-around when he raised the flaps, and failed to maintain obstacle clearance with the trees.
- [NTSB NYC98LA101](https://openairdocs.org/ntsb/NYC98LA101.md): Beech D95A · Mount Sterling, KY · Accident · Serious injuries · Limited investigation · Final report · Apr 24, 1998 · N479AM · Destroyed
  > Was the failure of the flight instructor to feather the engine in a timely manner. Factors were improper placement of the fuel selector valve by the student and failure of the flight instructor to adequately supervise its placement.
- [NTSB LAX98FA141](https://openairdocs.org/ntsb/LAX98FA141.md): Cessna 172 · Ramona, CA · Accident · 2 fatal · Field investigation · Final report · Apr 24, 1998 · N8364L · Destroyed
  > The loss of control of the aircraft on final approach for undetermined reasons.
- [NTSB IAD98FA047](https://openairdocs.org/ntsb/IAD98FA047.md): Beech 58 · Columbus, OH · Accident · 1 fatal · Field investigation · Final report · Apr 24, 1998 · N258B · Destroyed
  > The pilot's inadequate planned approach and his failure to follow wake turbulence avoidance procedures by not staying above the glide-path of the preceding Boeing 757, which resulted in a vortex turbulence encounter. Contributing to the accident was the wake…
- [NTSB FTW98FA191](https://openairdocs.org/ntsb/FTW98FA191.md): Beech F33A · Del Rio, TX · Accident · 1 fatal · Field investigation · Final report · Apr 24, 1998 · N2179L · Destroyed
  > the pilot's loss of control during a go-around after impacting approach light poles on initial approach. A contributing factor was the prevailing dark night light condition.
- [NTSB NYC98LA097](https://openairdocs.org/ntsb/NYC98LA097.md): Let L-23 Super Blanik · Pipersville, PA · Accident · Serious injuries · Limited investigation · Final report · Apr 21, 1998 · N298BA · Substantial damage
  > the pilot's misjudgment of distance and altitude, while on an approach to an off-airport landing area, which resulted in a lack of airspeed and/or altitude to reach the intended landing area (undershoot), a stall or mush into tree(s), and collision with a…
- [NTSB LAX98LA140](https://openairdocs.org/ntsb/LAX98LA140.md): Bell 206L-1 · Los Angeles, CA · Accident · No injuries · Limited investigation · Final report · Apr 21, 1998 · N87WC · Substantial damage
  > An overtemp of the engine during start within 10 hours of the accident, and the failure to report the event to the maintenance facility.
- [NTSB NYC98FA095](https://openairdocs.org/ntsb/NYC98FA095.md): Mooney M20J · Bridgeport, CT · Accident · 1 fatal · Field investigation · Final report · Apr 20, 1998 · N40HL · Destroyed
  > The pilot's failure to maintain control of the airplane during night instrument meteorological conditions. Contributing factors were dark night conditions, low ceilings, rain, and his decision to divert to an airport under instrument meteorological conditions…
- [NTSB MIA98LA137](https://openairdocs.org/ntsb/MIA98LA137.md): Bennett M-500A · Lakeland, FL · Accident · No injuries · Limited investigation · Final report · Apr 20, 1998 · N105WB · Substantial damage
  > a hex nut on the cyclic flight control pushrod bolt had backed off for undetermined reason(s) and allowed the bolt to become disconnected from the control yoke teeter block, resulting in a loss of cyclic control and subsequent roll over during an emergency…
- [NTSB FTW98LA188](https://openairdocs.org/ntsb/FTW98LA188.md): Cessna 172P · Longmont, CO · Accident · Minor injuries · Limited investigation · Final report · Apr 19, 1998 · N6174K · Substantial damage
  > The pilot inadvertently stalling the aircraft during the landing touchdown. Factors were a crosswind and the pilot's lack of total flight experience.
- [NTSB LAX98LA138](https://openairdocs.org/ntsb/LAX98LA138.md): Porat RAF-200 · Hollister, CA · Accident · No injuries · Limited investigation · Final report · Apr 18, 1998 · N313EP · Substantial damage
  > The failure of the pilot to maintain control of the aircraft. A factor in this accident is the pilot's lack of experience in type aircraft.
- [NTSB LAX98LA137](https://openairdocs.org/ntsb/LAX98LA137.md): Grumman American AA5B · Aguanga, CA · Accident · No injuries · Limited investigation · Final report · Apr 18, 1998 · N28565 · Substantial damage
  > the lack of available published information regarding obstructions and nonstandard lighting at the private airport, and the lack of a lighted and properly marked displaced threshold.
- [NTSB LAX98LA136](https://openairdocs.org/ntsb/LAX98LA136.md): Beech M35 · North Las Vegas, NV · Accident · Minor injuries · Limited investigation · Final report · Apr 18, 1998 · N9703R · Substantial damage
  > fuel starvation due to the pilot's improper fuel management and his failure to select the fullest tank for landing.
- [NTSB FTW98LA187](https://openairdocs.org/ntsb/FTW98LA187.md): Bell 206B · Cameron, LA · Accident · No injuries · Limited investigation · Final report · Apr 17, 1998 · N59604 · Substantial damage
  > The loss of engine power for undetermined reasons and the pilot's improper flare which resulted in a hard landing.
- [NTSB MIA98LA133](https://openairdocs.org/ntsb/MIA98LA133.md): Piper PA-46-310P · Miami Lakes, FL · Accident · No injuries · Limited investigation · Final report · Apr 15, 1998 · N46SX · Substantial damage
  > The failure of the pilot to ensure the aircraft contained enough fuel to complete the flight resulting in loss of engine power due to fuel exhaustion.
- [NTSB MIA98LA130](https://openairdocs.org/ntsb/MIA98LA130.md): Starck Auriga · Collegedale, TN · Accident · 1 fatal · Limited investigation · Final report · Apr 11, 1998 · N311RS · Destroyed
  > A leak in the electric fuel boost pump caused by an improperly sized 'O' ring installation and the pilot's failure to maintain airspeed during an approach to a forced landing resulting in a stall.
- [NTSB MIA98LA129](https://openairdocs.org/ntsb/MIA98LA129.md): Krips Kolb Firestar · Dallas, GA · Accident · Serious injuries · Limited investigation · Final report · Apr 11, 1998 · UNREG · Destroyed
  > The pilot's failure to maintain adequate airspeed for the existing wind conditions.
- [NTSB LAX98LA135](https://openairdocs.org/ntsb/LAX98LA135.md): Cessna 172M · Scottsdale, AZ · Accident · Minor injuries · Limited investigation · Final report · Apr 11, 1998 · N73405 · Destroyed
  > The pilot's failure to maintain directional control and his inadequate compensation for the wind condition. A contributing factor was the crosswind.
- [NTSB CHI98FA119](https://openairdocs.org/ntsb/CHI98FA119.md): Cessna 208B · Bismarck, ND · Accident · 1 fatal · Field investigation · Final report · Apr 7, 1998 · N868FE · Destroyed
  > the pilot's failure to maintain adequate airspeed during the approach which resulted in an inadvertant stall. Factors associated with the accident were the icing conditions and the pilot's low level experience in this make and model of airplane.

Next page: https://openairdocs.org/ntsb-phases/500/cases.md?page=114

## 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 = 500)
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-phases/500/cases?page=113

---
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.
