ASN Wikibase Occurrence # 199518
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| Date: | Tuesday 19 July 2016 |
| Time: | 11:20 |
| Type: |  Chance Vought F4U-5 Corsair |
| Owner/operator: | Private |
| Registration: | N179PT |
| MSN: | 122179 |
| Year of manufacture: | 1948 |
| Total airframe hrs: | 2489 hours |
| Engine model: | Pratt & Whitney R2800 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | East Troy, WI -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | East Troy, WI (57C) |
| East Troy, WI (57C) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Before the accident flight, the airplane's brakes were replaced with a custom brake system. Testing of the brake system after installation resulted in a failure of the right master cylinder. The cylinder was disassembled and the O-ring was found cut. The mechanic could not find any reason for the cut O-ring, so the O-rings on both master cylinders were replaced. The next brake test resulted in a brake fluid boil, and the brake builder informed the mechanic to change the type of hydraulic fluid. A subsequent ground brake test produced "no issues or hesitation with the brakes at all," to include "a full pressure pedal push to simulate a full locked brake to pressure test [the] system prior to taxi test." A maintenance flight was then conducted, and, during landing, the airplane began to drift to the right. The commercial pilot applied the left brake; however, the brake failed and the pedal “went to the floor.” The airplane departed the runway and collided with a wind sock structure. Postaccident examination revealed that the left brake master cylinder O-ring was cut; however, the reason for the cut could not be determined.
After the accident, the mechanic contacted the master cylinder manufacturer for guidance. The company replaced the master cylinders with an upgraded model. The new cylinders were installed on the airplane and the mechanic, with guidance from the custom brake manufacturer, conducted more testing. A second airplane flew with the newer brake system without issue.
Probable Cause: A failure of the O-ring in the left brake master cylinder for reasons that could not be determined, which resulted in a loss of directional control during landing.
Accident investigation:
 |
|
Sources:
NTSB
History of this aircraft
Other occurrences involving this aircraft
| 25 February 1984 | N4903M | Midkiff Properties | 0 | Alief, TX | |
w/o |
| 29 July 1999 | N712RD | Cavanaugh Flight Museum Inc. | 0 | Oshkosh, WI | |
sub |
| 29 July 1999 | N179PT | Private | 0 | Beside RWY18 at Wittman Airport, Oshkosh, WI | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 08-Sep-2017 19:48 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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