Cessna 172M N61838
7 September 1994 · Coolin, Idaho, United States · Minor injuries
Summary
On 7 September 1994 at about 20:00 local time, a Cessna 172M registered N61838 was involved in an accident near Coolin, Idaho, United States. 3 people were on board and one had minor injuries. 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 20:00
- Classification
- Accident
- Location
- Coolin, Idaho, United States
- Coordinates
- 48.5991, -116.8591
- Aircraft
- Cessna 172M
- Registration
- N61838
- Category
- Airplane
- Engines
- 1
- Operator
- Not recorded
- Operating rule
- Part 91: General Aviation
- Purpose of flight
- Personal
- Phase of flight
- Not recorded
- Route
- Cavinaugh Bay → Unknown
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- SEA94LA235
People
1 person had minor injuries.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 3 | 0 | 0 | 1 | 2 |
Probable cause
THE FAILURE OF THE ENGINE MANUFACTURER TO PROPERLY REMANUFACTURE AND ADEQUATELY INSPECT THE NO. 1 ROCKER ARM PRIOR TO ITS INSTALLATION ON THE ENGINE. THIS RESULTED IN FATIGUE CRACKING OF THE ROCKER ARM AND A SUBSEQUENT LOSS OF ENGINE POWER.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
THE PRIVATE PILOT WAS FORCED TO LAND THE AIRPLANE ON UNSUITABLE TERRAIN BECAUSE OF A LOSS OF ENGINE POWER. DURING THE FORCED LANDING, THE AIRPLANE IMPACTED A TREE STUMP, NOSED OVER, AND WAS SUBSTANTIALLY DAMAGED. AN EXAMINATION OF THE ENGINE REVEALED THAT THE ROCKER ARM FOR THE NO. 1 CYLINDER EXHAUST VALVE HAD FAILED. AN EXAMINATION OF THE ROCKER ARM REVEALED THAT THE ARM HAD FAILED DUE TO FATIGUE, AND THAT THE FATIGUE CRACKING WAS INITIATED AT ROUGH TOOL MARKS PRODUCED DURING THE CHAMFERING OF THE ARM'S OIL HOLE. THE CHAMFERING WAS PERFORMED BY THE ENGINE MANUFACTURER DURING REMANUFACTURE OF THE ENGINE.
Quoted verbatim from the NTSB record.
Other Cessna 172 accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 26 Jun 1994 | Cessna 172N | Lambertville, Michigan, United States | Davis College | Minor injuries | - |
| 21 Jul 1994 | Cessna 172N | Chatham, Massachusetts, United States | - | No injuries | - |
| 29 Apr 1994 | Cessna 172P | Hillsboro, Oregon, United States | Eagle Flight Center, Inc. | No injuries | - |
| 1 Jul 1994 | Cessna 172B | Shiocton, Wisconsin, United States | - | Serious injuries | - |
| 26 Jul 1994 | Cessna 172A | Block Island, Rhode Island, United States | - | No injuries | - |
| 29 May 1994 | Cessna 172M | Lookout Pass, Idaho, United States | St. Maries CAP Aero Club | Serious injuries | - |
All 12,209 records for this type
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 21 May 1994 | Grumman G-164B | Princeton, Idaho, United States | Fly-It-On, Inc. | Minor injuries | - |
| 28 May 1994 | Piper PA-25-260 | Rexburg, Idaho, United States | Neeley, Owen J. | Serious injuries | - |
| 2 Jun 1994 | Ayres S2R | Burley, Idaho, United States | - | No injuries | - |
| 3 Jun 1994 | Piper PA-22 | Melba, Idaho, United States | - | No injuries | - |
| 19 Jun 1994 | Cessna 182Q | Indian Valley, Idaho, United States | Johnson, Edward G. | Minor injuries | - |
| 1 Jul 1994 | Piper PA-38-112 | McCall, Idaho, United States | - | No injuries | - |