Probable cause
A loss of brake system fluid due to leaks in the o-rings, which resulted in asymmetrical braking and a subsequent loss of directional control during the landing roll.
NTSB analysis
The airline transport pilot of the tailwheel-equipped airplane reported that the previous landing, which was flown by the pilot-rated passenger, was uneventful. The pilot then conducted the second landing, during which he reported that the right brake was not operating correctly, which resulted in asymmetrical braking. The airplane ground looped and sustained substantial damage.
Postaccident testing of the brake system revealed that the right brake had a small leak from both o-rings only while pressurized. Both o-rings on both calipers were replaced, the brake system was pressurized, and no further leaks were found.
Text from the NTSB. Open the NTSB docket for ANC17LA005 for the full record.
Event
- Date
- Nov 12, 2016
- Type
- Accident
- Place
- Ninilchik, Alaska
- Nearest airport
- Ninilchik (NIN)
- Highest injury
- None
- Weather
- Visual (VMC)
- Light
- Day
Cessna A185
- N-number
- N4918Q
- Category
- Airplane
- Year built
- 1978
- Damage
- Substantial
- Operating rule
- Part 91 (general aviation)
- Purpose of flight
- Personal
From the NTSB aviation accident database: N-registered aircraft, events since 2008, data through Oct 28, 2026. The file is published monthly, so the latest weeks are incomplete and recent records can change. The official source is the NTSB aviation investigation search. CheckAero is independent and not affiliated with the NTSB.