ERA18LA067 · Cessna 172RG
Cessna 172RG · Accident: system/component malfunction/failure (non-power) on approach
From Eastern WV Regional Airport/Shepherd Field (MRB) to Eastern WV Regional Airport/Shepherd Field (MRB)
Event
- NTSB case
- ERA18LA067
- 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 172RG
- Aircraft type
- Cessna 172
- 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
- N9415B
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Eastern WV Regional Airport/Shepherd Field (MRB), Martinsburg, WVTo Eastern WV Regional Airport/Shepherd Field (MRB), Martinsburg, WV
- Aircraft age
- About 37 years (built 1981)
- 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
- Approach · VFR pattern downwind
- Defining eventThe 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
- System/component malfunction/failure (non-power)
- 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
- Aircraft › Aircraft systems
- Aircraft › Fluids/miscellaneous hardware
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
The flight instructor stated that he and the private pilot were about to make their seventh landing, but when the pilot extended the gear, the gear down-and-locked light did not illuminate. A visual check revealed that the nose gear was extended but the main gear was not fully extended. The flight instructor used the emergency gear handle to try and pump the main gear down, but there was insufficient hydraulic pressure in the system. The flight instructor landed the airplane with the nosewheel extended, but the airplane’s left wing dropped, which resulted in substantial damage to the left wing and the elevator. After exiting the airplane, hydraulic fluid was observed pooling under the airplane and along the side of the empennage. Postaccident examination of the airplane revealed that an O-ring inside the right gear actuator failed and was leaking hydraulic fluid. Because the landing gear is extended/retracted by hydraulic pressure, the leak likely prevented the system from having adequate pressure for the electric pump and the manual gear handle to extend the gear.
Probable cause
A hydraulic leak in the right main landing gear actuator, which resulted in the main landing gear not extending.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record ERA18LA067
- Event ID
- 20180124X34056
- Case number
- ERA18LA067
- Dataset
- full-current
- Source SHA-256
- 5cf380f0061817c0331a6b2d8cc7e0ee3a79bea469a1001dc5c10e56f35f5ab3
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: 8e4b1381da861394c64fefe09d9a59a376cfc98412b2e5ba1a559d75a29553e2; retrieved 2026-09-16T06:21:19.317Z.