# NTSB ANC93LA098: Cessna 207, N9869M, Grayling, AK, June 19, 1993

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 19, 1993, 13:30 local (17:30 UTC)
- Place: Grayling, AK
- Coordinates: 62.889888, -160.10083 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=62.8899&lon=-160.1008&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report June 30, 1994
- Report: Approved by Office Director
- NTSB office: Alaska Regional Office
- NTSB case key (mKey): 2365
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC93LA098
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/2365/pdf
- Page: https://openairdocs.org/ntsb/ANC93LA098

## Probable cause

THE PARTIAL FAILURE OF THE AIRPLANE'S BRAKING SYSTEM.

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Overrun, landing - roll
  - landing gear,normal brake system - failure,partial (cause)

## Analysis

AFTER LANDING THE PILOT APPLIED BRAKE PRESSURE AND THE RIGHT BRAKE WENT 'SOFT.'  HE WAS UNABLE TO STOP THE AIRPLANE BEFORE RUNNING OFF THE LEFT SIDE OF THE RUNWAY.  EXAMINATION OF THE AIRPLANE SHOWED THAT THE RIGHT BRAKE PISTON AND 'O' RING HAD POPPED OUT OF THE CALIPER.

## Factual narrative

On June 19, 1993, at 1345 Alaska daylight time, a wheel equipped Cessna 207 airplane, N 9869M, registered to and operated by MarkAir Express of Anchorage, Alaska, ran off the left side of the runway during the landing roll at Grayling, Alaska.  The air taxi flight, operating under 14 CFR Part 135, departed Aniak, Alaska, and the destination was Grayling.  A company VFR flight plan was filed and visual meteorological conditions prevailed.  The Commercial Certificated Pilot-in-Command, the sole occupant, was not injured and the airplane received substantial damage.

According to the Pilot-in-Command the landing was normal and when he applied brakes the right brake pedal went "soft."  He was unable to stop the airplane before running off the left side of the runway.  Examination of the airplane and the right brake caliper showed that the piston and "O" ring had popped out of the caliper and the brake hydraulic brake fluid leaked out.

## Aircraft

- Registration: [N9869M](https://openairdocs.org/aircraft/N9869M), registered now, S/N 20700744, built 1981 (OpenAirDocs)
- Reported make and model: CESSNA 207
- Registry model: [Cessna 207A](https://openairdocs.org/model/cessna-207a) (registry code 2073605) (OpenAirDocs)
- Registry engine: [Continental IO-520-F](https://openairdocs.org/engine/continental-io-520-f) (registry code 17237, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 20700744
- Engines: CONTINENTAL IO-520 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 135
- Operator: Markair Express, Inc.
- Registered owner: Markair Express, Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: AAIP, June 18, 1993, 0 hours before
- Departed: ANI, ANIAK, AK
- Flight plan: Company VFR
- Airport: KGX, Grayling, runway 33, 2,200 × 60 ft, gravel

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 25; commercial, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; toxicology performed; flight hours: 1,485 total, 392 in this make and model, 1,295 as pilot in command, 312 in the last 90 days, 106 in the last 30 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 90 statute miles
- Lowest ceiling: none
- Temperature: 70 °F

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19930619025179A](https://openairdocs.org/incident/19930619025179A), Jun 19, 1993: Cessna 207, Grayling, AK, Substantial damage. Right brake pedal went soft on landing roll. Ran off runway. Piston o right popped out of caliper. Lost fluid.

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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