SEA01LA042 · Cessna 182R
Cessna 182R · Accident: airframe, component or system failure
From Olympia Regional Airport (OLM) to Renton Municipal Airport (RNT)
Event
- NTSB case
- SEA01LA042
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- Unknown
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Cessna 182R
- Aircraft type
- Cessna 182
- Category
- Airplane
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N7568T
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Olympia Regional Airport (OLM), Olympia, WATo Renton Municipal Airport (RNT), Renton, WA
- Aircraft age
- Not recorded
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 91: General Aviation
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- Unknown
- First occurrenceThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Airframe, component or system failure
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Hydraulic system, pump › Worn
- Pilot in command › Gear down and locked, not verified
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
The pilot departed Olympia in the Cessna 182R en route to Renton, Washington. Shortly after departure he smelled a "faint odor of electrical insulation" but observed no anomalies. Upon arrival at Renton, he lowered the landing gear, and during the landing roll the main landing gear collapsed. Post-crash examination of the aircraft revealed that the hydraulic power pack had worn gears within the pump assembly. This condition would allow the electrically driven pump to operate for longer than normal periods of time and ultimately resulted in the pump overheating and its associated circuit breaker tripping during the flight. Additionally, the green landing gear "down and locked" annunciator light's manual iris was found to be open only 1/16 of an inch. With the iris stopped down to near total closure the pilot would have been unable to see the green light had it been illuminated. With the electrically driven pump out of service due to the tripped circuit breaker, the gear would not have hydraulic pressure to lock into the down position and complete the circuit thus illuminating the green light, and the pilot failed to verify a down an locked condition other than placing the gear handle in the down position.
Probable cause
The worn condition of the hydraulic pump gears which resulted in a continuous running pump, subsequent pump motor overheat and eventually the tripping of the pump motor circuit breaker. An additional cause was the pilot's failure to verify that the landing gear were down and locked. A contributing factor was a partially blocked green annunciator light.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record SEA01LA042
- Event ID
- 20010206X00408
- Case number
- SEA01LA042
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status. Values present in the bulk record are kept.
- The date is the local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: 72d2ca53b1c52a8f7adcd9abc45a823d2781fdb7aac13d5d33517bacce40b7b1; retrieved 2026-09-22T12:12:19.627Z.