Cessna 177A accident near Big Bear City, California, September 20, 1999
On September 20, 1999 at about 6:39 pm local time, a Cessna 177A, registered N39AE, was substantially damaged in an accident near Big Bear City, California (Big Bear City airport). It was a flight of an unrecorded kind under general aviation rules (Part 91). No one was hurt; 1 person was on board or involved. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
A loss of engine power due to fuel system contamination, which resulted from the mechanic's failure to fully inspect and verify the serviceability of the fuel system before returning the aircraft to service for a maintenance ferry flight. The pilot's decision to attempt flight with unresolved discrepancies in the reliability of the engine to produce power was a factor in the accident.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- September 20, 1999 · about 6:39 pm local time
- Place
- Big Bear City, California · Big Bear City · map
- Type
- Accident
- Injuries
- No one was hurt; 1 person was on board or involved.
- Weather
- visual conditions (good weather)
- Aircraft
- Cessna 177A · all 177As on the register
- Registration
- N39AE · registry record · serial 177-01179
- Damage
- Substantial damage
- Flight
- Flight of an unrecorded kind · general aviation rules (Part 91)
The NTSB's narrative final · quoted from the NTSB record
The aircraft was parked outside on the ramp for several months, with the fuel drains removed and the tanks drained. An A&P mechanic replaced the fuel drain in the right tank and added fuel for a maintenance ferry flight. The pilot performed a preflight and before takeoff checks. The engine stalled once during taxi, then began to miss and run roughly after takeoff. After returning, the pilot drained the fuel sumps and found a 'small amount of water' in the gascolator. He then drained an additional gallon of fuel from the tank without finding any additional water or sediment. After takeoff on the second flight, the engine began surging and then quit. When attempts to restart the engine failed, he turned back toward the airport but could not reach the runway and ditched the airplane in the water. The mechanic did not perform or offer to perform any additional troubleshooting procedures between the first and second flight. The inside of the gascolator was coated with an insoluble greenish-brown film. The left wing fuel quantity transmitter was coated with material that was similar in appearance to a non-silicon sealant. The material was decomposing and readily flaked off when touched. About 10cc of liquid was recovered from the fuel reservoir; about half was water, with a heavier sediment that was similar in color and consistency as to the material coating the fuel quantity transmitter. The above noted discrepancies were located in areas that would not be accessible or serviceable by a pilot performing a preflight inspection.
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The factual record from the NTSB's investigation tables, in plain English
Pilot
- Certificate: airline transport pilot, flight instructor, commercial pilot, military
- Ratings: multi-engine land; single-engine land; instructor: airplane multi-engine; instructor: airplane single-engine; instructor: helicopter; instructor: instrument airplane; instrument: airplane; rotorcraft: helicopter
- Flight time: 13,099 hours in all; 400 in this make and model; 120 in the last 90 days; 40 in the last 30 days; 12,494 as pilot in command; 5,258 on instruments
- Medical certificate: Class 2 (valid medical--w/ waivers/lim.)
- Seat: left
The aircraft
- Airframe total time: 3,381 hours
- Last inspection: annual inspection, December 17, 1998; 20 hours since
- Maximum gross weight: 2,500 lb
- Seats: 4
- Landing gear: fixed
- Engine: Lycoming O-360-A2F (piston); 0 hours total
The flight
- Departed from: L35 at 6:30 pm
- Flight plan: none
- Runway 0
Weather at the time
- Light: daylight
- Wind: from 220° at 9 knots, gusting 16
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 73°F (23°C), dew point 0°F (-18°C)
- Altimeter: 30.00 inHg
- Observation at 6:40 pm from L35
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
The docket, the folder of records gathered during an investigation (maintenance records, photographs, witness statements, examinations), has not been read from the NTSB for this case yet; the list appears here once it has. Open the docket at the NTSB.
Everything on this page comes from the NTSB's public records. The narrative, probable cause and findings are the NTSB's own words; the coded tables behind the report are written out in plain English, with pilots' ages, home towns and medical details left out. The documents and photographs are the NTSB's docket, shown as the NTSB released them. This site's own text never names anyone involved. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.