Grumman G-164 N788Y
8 July 1989 · Guymon, Oklahoma, United States · Serious injuries
Summary
On 8 July 1989 at about 00:15 local time, a Grumman G-164 registered N788Y, operated by Gray, Ronald W., was involved in an accident near Guymon, Oklahoma, United States. One person was on board and one was seriously 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 00:15
- Classification
- Accident
- Location
- Guymon, Oklahoma, United States
- Coordinates
- 36.6793, -101.4792
- Aircraft
- Grumman G-164
- Registration
- N788Y
- Category
- Airplane
- Engines
- 1
- Operator
- Gray, Ronald W.
- Operating rule
- Part 137: Agricultural
- Purpose of flight
- Aerial Application
- Phase of flight
- Not recorded
- Route
- Hooker → Unknown
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- FTW89DPJ08
People
1 person was seriously injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 1 | 0 | 1 | 0 | 0 |
Probable cause
FAILURE OF THE UPPER RIGHT ENGINE MOUNT (FIREWALL ATTACH BOLT) DUE TO FATIGUE, AND FAILURE OF THE LOWER RIGHT MOUNTING BOLT FOR AN UNKNOWN REASON, WHICH ALLOWED OVERLOAD FAILURE OF THE TWO REMAINING MOUNTING BOLTS AND SEPARATION OF THE ENGINE.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
DURING PULLUP FOR A TURNAROUND MANEUVER, THE ENG FELL FROM THE AG AIRPLANE. CONTROL WAS LOST & THE AIRPLANE HIT FLAT IN A FIELD. A POST-ACDNT INVESTIGATION REVEALED THE UPPER RIGHT ENG MOUNT (FIREWALL ATTACH BOLT) HAD FAILED FROM FATIGUE. THE LOWER RIGHT BOLT HAD ALSO FAILED PRIOR TO ENG SEPARATION, BUT ITS FACTURE SURFACE WAS TOO BADLY DAMAGED TO VERIFY THE REASON OF FAILURE. THE UPPER LEFT & LOWER LEFT ATTACH BOLTS WERE FOUND NECKED DOWN AT THEIR RESPECTIVE FRACTURES FROM OVERLOAD FAILURE.
Quoted verbatim from the NTSB record.
Other Grumman G-164 accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 19 Apr 1989 | Grumman G-164 | Kindred, North Dakota, United States | - | No injuries | - |
| 30 Jun 1989 | Grumman G-164-B | Mer Rouge, Louisiana, United States | William C. Norsworthy | Fatal | - |
| 23 Sep 1989 | Grumman G-164 | Mohave Valley, Arizona, United States | - | No injuries | - |
| 18 Jun 1988 | Grumman G-164 | Ayr, North Dakota, United States | - | No injuries | - |
| 2 Apr 1988 | Grumman G-164 | Palacios, Texas, United States | - | No injuries | - |
| 10 Nov 1988 | Grumman G-164 | Blythe, California, United States | Chuck Jones Flying Service | No injuries | - |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 26 Apr 1989 | Piper PA-32-300 | Eufaula, Oklahoma, United States | Bauer, Kathleen | No injuries | - |
| 27 Apr 1989 | Cessna 182 | Owasso, Oklahoma, United States | William Burney York | No injuries | - |
| 6 May 1989 | Bell 47L | Tulsa, Oklahoma, United States | Allied Helicopters, Inc. | No injuries | - |
| 19 May 1989 | Cessna 177B | Harrah, Oklahoma, United States | Advance Meat Co., Inc. | No injuries | - |
| 21 May 1989 | Aeronca 65-TAC | Pryor, Oklahoma, United States | Cole, Charles W. | Serious injuries | - |
| 24 May 1989 | Piper PA-28R-200 | Edmond, Oklahoma, United States | James, Rodney C. | No injuries | - |