Incident
On 17 May 2017 at 0929 UTC, a Cessna 525A (N525DT), a twin-engine business jet, made an ILS/DME approach to Runway 27 at Gloucestershire Airport. The pilot reported that the weather was raining, with broken clouds at 500 ft, temperature 13°C, visibility 5,000 m, and negligible wind. A runway inspection approximately five minutes prior indicated the runway surface was wet with water patches.
After touchdown, the pilot reported that the aircraft brakes were inoperative. He steered the aircraft off the runway onto a clear grassy area on the right side, where it came to rest. The aircraft sustained minor damage: dents on the right main landing gear door and the right flap.
Investigation
Subsequent engineering inspection could not replicate the reported brake fault. As a precautionary measure, the brake cable rigging was checked, and the brake metering valve and anti-skid computer were replaced. The aircraft had two occupants—the pilot and one passenger—neither of whom reported any injuries.
Outcome
The aircraft suffered only minor structural damage. No further incidents related to the brake system were reported following the component replacements. The investigation did not identify a definitive cause for the brake failure.