ATL98LA062 · Stewart 51 INC. S-51D
Stewart 51 INC. S-51D · Accident: loss of engine power en route
Event
- NTSB case
- ATL98LA062
- 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
- 0
- 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
Stewart 51 INC. S-51D
- Aircraft type
- Stewart 51 S-51
- 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
- N51S
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From not recordedTo not recorded
- 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
- En route · climb to cruise
- 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
- Loss of engine 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
- Fluid, oil › Exhaustion
- Lubricating system, oil tank › Ruptured
- Miscellaneous, engine › Obstructed
- Other maintenance personnel › Maintenance, improper
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
The flight was on climb out when the pilot experienced a loss of engine power. The pilot radioed the air traffic control tower and reported the engine problem. The pilot was cleared for a downwind emergency landing on runway 29R. The airplane landed on the first 1/3 of the runway, and rolled off the departure end of the 3500 foot long paved surface, and collided with a ditch. The examination of the engine assembly disclosed that the engine oil tank was ruptured; there was no oil recovered from the engine lubrication system. The examination of the oil tank assembly disclosed that a plastic plug blocked the oil tank breather line. According to the operator of the airplane, the oil tank had been removed, and was painted several days prior to the accident. During the painting operation, all holes, in the tank, including the oil tank breather line, were covered with plastic plugs.
Probable cause
The maintenance personnel failure to remove a plastic plug from the oil tank breather that resulted in the rupture of the engine oil tank. Factors were, a tailwind during the emergency landing, and a ditch on the departure end of the runway.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record ATL98LA062
- Event ID
- 20001211X09800
- Case number
- ATL98LA062
- 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: fc05a8a76d0c850def81c6dbe4c2656c34c1823b2686787be6f078c76c502ad6; retrieved 2026-09-22T17:52:47.821Z.