Pilot Debrief

CESSNA A185 near Ninilchik, AK — 2016-11-12

Final reportANC17LA005
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Date
2016-11-12
Location
Ninilchik, AK, USA
Airport
NIN
Aircraft
CESSNA A185
Registration
N4918Q
Category
Airplane
Highest injury
None
Fatalities
0
Phase of flight
Landing

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 narrative

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.

Analysis

Primary failure mode
Mechanical failure
First missed decision gate
Pilot could have tested brakes before landing to confirm functionality.

NTSB coding

Evidence available

  • Photos
  • 6 docket documents
View NTSB final reportView NTSB docket

Docket documents6

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