CubCrafters CC11-160 N232LT

Summary

On 16 January 2015 at about 18:34 local time, a CubCrafters CC11-160 registered N232LT was involved in an accident near San Luis Obispo, California, United States. 2 people were on board and nobody was injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

16 January 2015 at 18:34

Classification

Accident

Location

San Luis Obispo, California, United States

Nearest airport

San Luis County Rgnl (SBP)

Coordinates

35.0964, -120.0636

Aircraft

CubCrafters CC11-160

Registration

N232LT

Category

Airplane

Year built

2013

Engines

1

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

San Luis Obispo → San Luis Obispo

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

WPR15LA085

Nobody was injured.

The pilot's inadequate instrument scan during cruise flight, which resulted in his failure to notice a loss of engine oil pressure. Contributing to the accident was the failure of the oil pressure transducer supply line, which resulted in oil exhaustion and a total loss of engine power.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

The pilot reported that, about 40 minutes after takeoff for the local sightseeing flight, he noticed that the engine oil gauge wasn't indicating properly and that, about 1 minute later, the engine started to "skip." Shortly later, the engine lost all power, and the pilot performed a forced landing to a field. The experimental light-sport airplane nosed over and sustained substantial damage. Neither occupant was injured. Examination revealed considerable oil streaking along the airplane's entire belly in an area obscured from the pilot's view while in flight. Further examination revealed that the oil pressure transducer supply line, which was made of copper tubing, had separated from its fitting on the engine accessory case. Data from the airplane's engine monitoring system (EMS) showed that, about 9 minutes after takeoff, the engine oil pressure dropped out of range, indicating that the supply line failed at that time; the data also showed that a flashing visual oil pressure alert occurred. For the remaining 28 minutes of flight, the oil pressure remained the same, and the alert remained active as all of the engine's oil was expelled out of the separated oil pressure transducer supply line and overboard. The failed copper tubing oil pressure transducer supply line was the subject of a service bulletin (SB), which recommended either periodic inspection of the copper tubing for leaks or replacement of it with a flexible hose. Despite being inspected in accordance with the SB, the supply line still failed. Following the accident, the airplane manufacturer issued a mandatory service alert, which required the replacement of the copper tubing with a flexible hose. As noted, the EMS data indicated that a flashing visual oil pressure alert was issued to the pilot as soon as the oil pressure transducer supply line failed; however, he did not notice the alert and continued the flight. He eventually observed the alert just before the engine seized. If he had noticed when the supply line failed, he would have had ample time to return to the departure airport before the oil was exhausted. Given that this was a sightseeing flight and that the majority of it was flown toward the sun, it is likely that the pilot was distracted during the flight and possibly encountered sun glare that obscured a clear view of the airplane's instrument panel.

Quoted verbatim from the NTSB record.