Schweizer G-164B N7502C
27 June 1998 · Oakdale, Washington, United States · No injuries
Summary
On 27 June 1998 at about 13:30 local time, a Schweizer G-164B registered N7502C, operated by Derrell Fender, was involved in an accident near Oakdale, Washington, United States. One person was 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.
The record
- Date
- at 13:30
- Classification
- Accident
- Location
- Oakdale, Washington, United States
- Nearest airport
- Oakesdale
- Coordinates
- 47.1194, -117.2492
- Aircraft
- Schweizer G-164B
- Registration
- N7502C
- Category
- Airplane
- Engines
- 1
- Operator
- Derrell Fender
- Operating rule
- Part 137: Agricultural
- Purpose of flight
- Aerial Application
- Phase of flight
- Not recorded
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- SEA98LA106
People
Nobody was injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 1 | 0 | 0 | 0 | 1 |
Probable cause
A fatigue failure of the number three cylinder exhaust rocker box assembly, compromising the ability of the exhaust valve to operate. Factors include a ditch at the end of the runway.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
According to the pilot, during takeoff, approximately 10 feet above the ground, the aircraft started backfiring and losing power. He aborted the takeoff, but was unable to get the aircraft stopped before impacting a ditch just off the departure end of the airstrip. A post-accident inspection of the engine by an FAA Airworthiness Inspector found that a portion of the number three cylinder head casting through which the exhaust valve rocker pin passes had fractured. This allowed the number three cylinder exhaust valve to remain in the closed position during the time that it should have been open, resulting in a loss of power. The rocker box casting was sent to the NTSB metallurgical laboratory for further analysis. That examination revealed that the fracture in the casting was the result of a fatigue crack that originated in the wall of the hole in the casting through which the rocker arm pivot bolt passed. It could not be determined what caused the fatigue crack to initiate.
Quoted verbatim from the NTSB record.
Other Schweizer G-164B accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 20 Jun 1997 | Schweizer G-164B | Edwards, Mississippi, United States | - | No injuries | - |
| 3 Sep 1997 | Schweizer G-164B | Larimore, North Dakota, United States | - | Fatal | 1 |
| 16 Jun 1997 | Schweizer G-164B | Rio Linda, California, United States | - | Serious injuries | - |
| 19 Apr 1999 | Schweizer G-164B | Marysville, California, United States | - | No injuries | - |
| 19 Mar 1999 | Schweizer G-164B | Bay Springs, Mississippi, United States | - | No injuries | - |
| 8 Jul 2000 | Schweizer G-164B | Moscow, Texas, United States | Paynes Flying Service, Inc. | Serious injuries | - |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 31 Mar 1998 | Cessna P210N | Royal City, Washington, United States | - | Fatal | 3 |
| 4 Jun 1998 | Cessna 172N | Prindle, Washington, United States | - | Fatal | 3 |
| 9 Apr 1998 | Cessna 150L | Seattle, Washington, United States | - | Minor injuries | - |
| 30 Jul 1998 | Embraer EMB-135 | Moses Lake, Washington, United States | - | No injuries | - |
| 19 Jul 1998 | Cessna 172P | Seattle, Washington, United States | Wings Aloft Inc. | No injuries | - |
| 24 Jul 1998 | Pilgrim STEEN SKYBOLT | Curtis, Washington, United States | - | Minor injuries | - |