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Date:Saturday 13 November 2010
Type:Silhouette image of generic SW4 model; specific model in this crash may look slightly different
Swearingen SA227-AC Metro III
Operator:LC Busre
Registration: N781C
MSN: AC-535
First flight: 1982
Total airframe hrs:27889
Engines: 2 Garrett TPE331-11U-611G
Crew:Fatalities: 0 / Occupants: 2
Passengers:Fatalities: 0 / Occupants: 17
Total:Fatalities: 0 / Occupants: 19
Aircraft damage: Substantial
Aircraft fate: Written off (damaged beyond repair)
Location:Andahuaylas Airport (ANS) (   Peru)
Phase: Landing (LDG)
Nature:Domestic Scheduled Passenger
Departure airport:Huaraz/Anta-Comandante FAP Germán Arias Graziani Airport (ATA/SPHZ), Peru
Destination airport:Andahuaylas Airport (ANS/SPHY), Peru
A Swearingen SA227AC Metro III passenger plane, registered N781C, sustained substantial damage in a runway excursion accident at Andahuaylas Airport (ANS), Peru. All 17 passengers and two crew members survived. The airplane operated on a flight from Huaraz/Anta Airport (ATA) to Andahuaylas Airport.
The accident airplane, N781C, suffered problems with the Nose Wheel Steering (NWS) and had a recurring history of brake system failures. The NWS problems were deferred by maintenance crew. The brake package was changed the day before the accident without troubleshooting the cause of the problems.
On the day of the accident the flight crew had again reported problems controlling the airplane's direction on the ground.
Maintenance crew then eliminated the pressure of the left brake package and bled the right brake system, again without troubleshooting the cause of the problems.
While taxiing out for takeoff on the accident flight, the crew noted the braking problems persisted. Yet, the captain decided to continue the flight with known brake issues and a disconnected NWS. The landing on Andahuaylas Airport (ANS) runway 03 initially went fine. At a ground speed of 40 knots the airplane began to swerve to the left with increasing intensity. The crew applied right hand brakes and put the right hand engine in reverse. This achieved a correction of about 15° but this was still insufficient. The airplane continued left until it went down a 4-metre embankment.

Probable Cause:

The loss of directional control of the aircraft during landing due to multiple failures in the brake system.

The imprecision of the provisions given by the pilot during the execution of normal and emergency procedures (CRM) in the descent and landing.
The decision of the crew to make the flight to Andahuaylas with problems in the brake system.

Brake problem
Runway excursion

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This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Huaraz/Anta-Comandante FAP Germán Arias Graziani Airport to Andahuaylas Airport as the crow flies is 667 km (417 miles).
Accident location: Exact; as reported in the official accident report.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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Global Action Plan for the Prevention of Runway Excursions (GAPPRE): recommendations and guidance material to prevent runway excursions

  • 684 built
  • 102nd loss
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  • 77th worst accident (at the time)
  • 80th worst accident (currently)
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