Gulfstream G-II N405MM
28 July 1990 · Cheyenne, Wyoming, United States · Serious injuries
Summary
On 28 July 1990 at about 00:00 local time, a Gulfstream G-II registered N405MM, operated by Martin Marietta Corporation, was involved in an accident near Cheyenne, Wyoming, United States. 10 people were on board and one was seriously injured, 7 had minor injuries. The NTSB has published a probable cause for this accident; it is quoted in full below.
The record
- Date
- at 00:00
- Classification
- Accident
- Location
- Cheyenne, Wyoming, United States
- Coordinates
- 41.4097, -104.0991
- Aircraft
- Gulfstream G-II
- Registration
- N405MM
- Category
- Airplane
- Engines
- 2
- Operator
- Martin Marietta Corporation
- Operating rule
- Part 91: General Aviation
- Purpose of flight
- Executive/Corporate
- Phase of flight
- Not recorded
- Route
- Englewood → Centerville
- Aircraft damage
- Not recorded
- Weather
- VMC
- Light
- Day
- NTSB number
- DEN90LA168
People
1 person was seriously injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 10 | 0 | 1 | 7 | 2 |
Probable cause
AN UNFORESEEN ENCOUNTER WITH CLEAR AIR TURBULENCE.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
THE AIRPLANE WAS APPROXIMATELY 100 NM NORTHEAST OF DENVER, DEVIATING AROUND THUNDERSTROM ACTIVITY, WHEN CLEAR AIR TURBULENCE (CAT) WAS ENCOUNTERED. THE CAPTAIN STATED AFTER THE ACCIDENT THE FLIGHT ATTENDANT HAD LEFT HIS SEAT TO PERFORM CABIN DUTIES AND WAS SQUATTING DOWN IN THE GALLEY WHEN THE AIRPLANE WAS BUFFETED BY THE TURBULENCE. TH FLIGHT ATTENDANT INJURED HIS ANKLE WHILE IN THIS POSITION. THE AIRPLANE RETURNED TO ENGLEWOOD, CO., AND THE FLIGHT ATTENDANT WAS TRANSPORTED TO THE HOSPITAL. ACCORDING TO THE DENVER ARTCC, THERE WERE NO REPORTS OF TURBULENCE BY OTHER AIRCRAFT PRIOR TO THE ENCOUNTER.
Quoted verbatim from the NTSB record.
Other Gulfstream G accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 30 Oct 1996 | Gulfstream G-IV | Wheeling, Illinois, United States | - | Fatal | 4 |
| 13 Mar 1999 | Gulfstream G-IV | Durango, Colorado, United States | - | No injuries | - |
| 6 Sep 2000 | Gulfstream G-IV | Sheridan, Wyoming, United States | - | Serious injuries | - |
| 5 Aug 2002 | Gulfstream G-IV | Jinzhou, China | United Technologies Corperation | Serious injuries | - |
| 14 Feb 2002 | Gulfstream G-V | West Palm Beach, Florida, United States | - | No injuries | - |
| 8 Feb 2002 | Gulfstream G-IV | Broomfield, Colorado, United States | - | Serious injuries | - |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 4 Jun 1990 | Piper PA-18-150 | Douglas, Wyoming, United States | Norman Ranch Company | No injuries | - |
| 24 Jun 1990 | Beechcraft 23 | Wheatland, Wyoming, United States | Mike Koogle | No injuries | - |
| 18 Dec 1990 | Piper PA-31-350 | Evanston, Wyoming, United States | Alpine Aviation | Fatal | 1 |
| 14 Jul 1990 | Mooney M20F | Torrington, Wyoming, United States | B & L Aviation, Inc. | No injuries | - |
| 27 Jul 1990 | Lake LA-250 | Rawlins, Wyoming, United States | - | Minor injuries | - |
| 1 Aug 1990 | Boson STARDUSTER TOO | Pinedale, Wyoming, United States | Robert E. Norris | No injuries | - |