BH Airlines AT72 at Copenhagen on Jan 14th 2013, runway excursion

Last Update: September 12, 2013 / 18:33:28 GMT/Zulu time

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Incident Facts

Date of incident
Jan 14, 2013

Classification
Report

Flight number
JA-406

Aircraft Registration
E7-AAD

Aircraft Type
ATR ATR-72-200

ICAO Type Designator
AT72

A BH Airlines Avion de Transport Regional ATR-72-200, registration E7-AAD performing flight JA-406 from Sarajevo (Bosnia Herzegovina) to Copenhagen (Denmark) with 38 passengers and 4 crew, landed on Copenhagen's runway 22L with a reported left cross wind component of 16 knots, the captain (ATPL, 4900 hours total, 4600 hours on type) was pilot flying with the first office (ATPL, 5000 hours total, 4700 hours on type) being pilot monitoring. After the aircraft had touched down the captain pulled both thrust levers to ground idle, the left engine and propeller went to ground idle, the right hand engine however did not follow the command. The aircraft began to veer left, the captain attempted to engage both engines in reverse, at that time the first officer called out "one low pitch" alerting the captain that only one engine had gone into ground idle. The captain attempted to apply right rudder and right wheel brakes in order to prevent the aircraft from leaving the runway, the aircraft however went beyond the left hand edge of the runway about 1250 meters past the runway threshold and rolled over soft ground for about 350 meters before the captain regained control, at that point the aircraft was about 60 meters left of the center line and about 17.5 meters off the runway edge. The captain taxied the aircraft back onto the runway at slow taxi speed, stopped on taxiway B5, informed air traffic control about the runway excursion and requested taxi to the apron. Tower instructed to hold position until emergency services had checked the aircraft, following the check by emergency services the aircraft taxied to the apron. No injuries occurred, the aircraft received no damage.

Denmark's HCL (Havarikommission, Accident Investigation Board) released their final report concluding the probable cause of the incident was:

Upon landing the right hand propeller electronic control (PEC) system failed. An inadequate action and not according to SOP, the reverse thrust with one LO PITCH light not illuminated was initiated and together with left hand crosswind component at 16 knots, worsening the asymmetric forces to the left.

The HCL reported: "The PEC (Propeller Electronic computer) had two fault codes (fault code 03 and 27). Both codes indicated failure to the ground fine pitch system and would appear when the PLA (power lever angle) was moved to a position below flight idle and for some reason the propeller blade did not follow the command. Normal taxi and reverse functions would be unavailable."

Maintenance completed the relevant actions in the troubleshooting sections of the maintenance manual, but did not find any anomaly. The PEC was reset, an engine run up conducted with the engine and propeller responding normally, and the aircraft was returned to service.
Incident Facts

Date of incident
Jan 14, 2013

Classification
Report

Flight number
JA-406

Aircraft Registration
E7-AAD

Aircraft Type
ATR ATR-72-200

ICAO Type Designator
AT72

This article is published under license from Avherald.com. © of text by Avherald.com.
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