Cessna 180 N420SB
4 April 1999 · Iliamna, Alaska, United States · No injuries
Summary
On 4 April 1999 at about 22:30 local time, a Cessna 180 registered N420SB was involved in an accident near Iliamna, Alaska, United States. 2 people were 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 22:30
- Classification
- Accident
- Location
- Iliamna, Alaska, United States
- Coordinates
- 59.8505, -154.5593
- Aircraft
- Cessna 180
- Registration
- N420SB
- Category
- Airplane
- Engines
- 1
- Operator
- Not recorded
- Operating rule
- Part 91: General Aviation
- Purpose of flight
- Personal
- Phase of flight
- Not recorded
- Route
- Unknown → Palmer
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- ANC99LA042
People
Nobody was injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 2 | 0 | 0 | 0 | 2 |
Probable cause
The improper installation of the main landing gear attaching bolt by maintenance personnel, which resulted in total failure of the bolt and collapse of the landing gear.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
The pilot was landing the wheel/ski equipped airplane on a frozen lake to wait for improving weather. During the landing roll, the pilot heard a 'whump' and the airplane settled onto the left wing. Inspection revealed the main landing gear attaching bolt had fractured in overload across a threaded area. The installed NAS-147R bolt was not the one specified for installation, and had a shorter smooth shank section (1.3 inches) than the specified AN bolt (1.43 inches). When an undamaged NAS-147R bolt is installed in the landing gear, a threaded area remains within the bolt hole. The bolt had been installed three weeks prior to the accident during the last annual inspection.
Quoted verbatim from the NTSB record.
Other Cessna 180 accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 14 Mar 1999 | Cessna 180G | Fairbanks, Alaska, United States | - | No injuries | - |
| 18 Aug 1999 | Cessna 180 | Quebec, Canada | Frank G Riess | No injuries | - |
| 14 Aug 1999 | Cessna 180H | Gillette, Wyoming, United States | - | No injuries | - |
| 23 Jan 1999 | Cessna 180J | Granbury, Texas, United States | - | No injuries | - |
| 9 Jun 1999 | Cessna 180J | Palmer, Alaska, United States | - | No injuries | - |
| 10 May 1999 | Cessna 180J | Necedah, Wisconsin, United States | Wisconsin DNR | Minor injuries | - |
All 2,729 records for this type
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 2 May 1999 | Piper PA-24-260 | Juneau, Alaska, United States | - | Fatal | 2 |
| 24 May 1999 | Stinson 108 | Anchorage, Alaska, United States | Glenn A. Ferris | Fatal | 1 |
| 29 May 1999 | De Havilland DHC 2 MK III | Anchorage, Alaska, United States | William A. Sego | No injuries | - |
| 13 Mar 1999 | Cessna 170B | Palmer, Alaska, United States | - | No injuries | - |
| 30 May 1999 | Piper PA-18 | Port Alsworth, Alaska, United States | James T. Ables | No injuries | - |
| 2 Jun 1999 | Robinson R22 | Glennallen, Alaska, United States | - | No injuries | - |