# Accident 19990419044599A: Scwzer G164B, Marysville, CA, April 19, 1999

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: April 19, 1999, 07:52 local time
- Place: Marysville, CA
- Airport: Farmairstrip
- Damage: Substantial damage
- Phase of flight: Low Level Operations
- Operating rules: Agricultural (Part 137)
- Operator: NGRG
- Location: 39.1515° N, 121.5834° W: Placed by OpenAirDocs: center of Marysville, CA, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=39.1515&lon=-121.5834&mi=10
- Aircraft: N3633B (not matched to a registry record)
- Reported make and model: SCWZER G164B
- Reported engine: PWA PT6A20
- People aboard: 1
- Fatal injuries: 0
- Pilot flight hours: 17,900 total, 12,000 in this make and model
- NTSB investigation: [NTSB LAX99LA157](https://openairdocs.org/ntsb/LAX99LA157) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19990419044599A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

(-23) DURING TAKEOFF PILOT REPORTED HEARING SEVERAL POP SOUNDS COMING FROM ENGINE FOLLOWED BY ENGINE POWER LOSS. AS A RESULT AIRCRAFT COLLIDED WITH ELECTRICAL WIRES CAUSING A/C TO STRIKE GROUND CAUSING NOSE ROLL-OVER. NO INJURIES REPORTED. (.4) THE PILOT SAID THAT HE HAD JUST TAKEN OFF FROM A FARM AIRSTRIP AND WAS INITIATING A TURN TO CLEAR A BUILDING WHEN SEVERAL 'POP' SOUNDS CAME FROM THE ENGINE AND IT BEGAN TO LOSE POWER. THE PILOT WAS UNABLE TO CLEAR A SET OF POWER LINES AND STRUCK THE WIRES. GROUND WITNESSES SAID THEY WATCHED THE AIRCRAFT LIFTOFF FROM THE AIRSTRIP AND BEGIN A GENTLE LEFT TURN TO CLEAR A BUILDING. IN THE TURN A TRAIL OF BLACK SMOKE BEGAN COMING FROM THE AIRCRAFT AS IT STARTED A SHALLOW DESCENT TOWARD A FIELD. JUST BEFORE THE AIRCRAFT HIT THE POWER LINES, A LARGE PUFF OF BLACK SMOKE EMANATED FROM THE AIRCRAFT. AFTER COLLIDING WITH THE WIRES, THE AIRCRAFT HIT THE GROUND AND NOSED OVER. THE WITNESSES HEARD DISTINCT 'POPPING SOUNDS' ASSOCIATED WITH THE ONSET OF THE SMOKE TRAIL. THE ENGINE WAS REMOVED AND TRANSPORTED TO A TURBINE ENGINE OVERHAUL FACILITY FOR EXAMINATION. TEARDOWN OF THE ENGINE REVEALED THAT                                                            ONE BLADE IN THE POWER TURBINE WHEEL HAD FAILED AT THE ROOT SECTION AND WAS NOT RECOVERED. TWO OTHER BLADES WERE FRACTURED AT THEIR APPROXIMATE MIDSPAN POINT AND THE OUTBOARD BLADE SECTIONS WERE NOT RECOVERED. ALL OTHER BLADES AROUND THE DISK EXHIBITED NICKS AND GOUGES IN THE LEADING EDGES. ALL FRACTURE SURFACES EXHIBITED GRANULAR FEATURES. THE COMPRESSOR BLEED VALVE WOULD NOT HOLD PRESSURE AND WAS FOUND TO BE LEAKING FROM THE SEAL UNDER THE SEAL SUPPORT PLATE-SECURING NUT. REVIEW OF THE ENGINE MAINTENANCE RECORDS DISCLOSED THAT THE COMPRESSOR BLEED VALVE WAS INSTALLED ON THE ENGINE 605 HOURS PRIOR TO THE ACCIDENT. PRIOR TO INSTALLATION ON THE ENGINE, A NEW DIAPHRAGM WAS INSTALLED IN THE VALVE.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB LAX99LA157](https://openairdocs.org/ntsb/LAX99LA157), Apr 19, 1999: Schweizer G-164B (N3633B), Marysville, CA, substantial damage. Probable cause: A loss of engine power due to a leaking surge bleed valve which induced compressor stalls within the engine.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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