ASN Wikibase Occurrence # 179093
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| Date: | Thursday 24 June 2004 |
| Time: | 15:10 |
| Type: |  Cessna 185F |
| Owner/operator: | Private |
| Registration: | N4585F |
| MSN: | 1851092 |
| Year of manufacture: | 1966 |
| Engine model: | Continental IO-520-D |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Gallatin Field, Bozeman, Montana -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | |
| Bozeman, MT (BZN) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During the landing roll, the pilot was applying heavy braking in order to turn off the runway at taxiway Echo, when the aircraft suddenly and rapidly ground-looped to the left. An initial post-accident inspection of the aircraft revealed that the right main gear brake rotor assembly had torn lose from the wheel itself, rendering the right wheel brake totally inoperative. The wheel hub and brake disk assembly were shipped to the NTSB Materials Laboratory, where it was determined that the brake disk attachment flange failed in fatigue in the bend around the attachment flange. The brake disk showed a substantial amount of general corrosion, and although the attachment flange met the minimum thickness requirements, most of its surface was covered by corrosion and corrosion pitting. The fatigue crack propagation that eventually lead to the failure had originated in one of these corrosion pits.
Probable Cause: The failure of the right main gear brake disk attach flange during the landing roll, due to fatigue cracks emanating from numerous corrosion pits present on the surface of the disk, leading to the right brake becoming totally inoperative, and resulting in a rapid inadvertent ground-loop. Factors include hard braking applied by the pilot in order to turn off the active runway at an early taxiway, and considerable corrosion on the surface of the brake disk flange.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20040702X00902&key=1
History of this aircraft
Other occurrences involving this aircraft
| 25 June 2016 | N4585F | Private | 1 | Coeur d'Alene Nat'l Forest, NE of Coeur d'Alene, ID | |
sub |
| CFIT | ||||||
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 29-Aug-2015 16:00 | Noro | Added |
| 21-Dec-2016 19:30 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 07-Dec-2017 18:03 | ASN Update Bot | Updated [Other fatalities, Destination airport, Source, Narrative] |
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