Aer Caribe AN26 at San Jose del Gua on Jun 7th 2014, runway excursion during rejected takeoff

Last Update: April 21, 2016 / 14:50:06 GMT/Zulu time

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Incident Facts

Date of incident
Jun 7, 2014

Classification
Accident

Airline
Aer Caribe

Destination
Mitu, Colombia

Aircraft Registration
HK4728

Aircraft Type
Antonov An-26

ICAO Type Designator
AN26

An Aer Caribe Antonov AN-26, registration HK4728 performing a charter flight from San Jose del Guaviare to Mitu (Colombia) with 13 passengers, 3 crew and 3797kg of freight, was accelerating for takeoff from San Jose del Gua's runway 01 when the aircraft developed vibrations and a tendency to the left. Suspecting a problem with the nose gear the commander eased pressure on the nose gear which sharply stopped the vibrations, the commander decided to reject takeoff close to V1. The engines were brought to idle, brakes were applied and the commander steered the aircraft back onto the center line when the commander called out "BRAKES" just as the aircraft veered sharply to the right, did not respond to pedal and nose wheel inputs and went off the runway about 1153 meters from the runway threshold. While running over soft ground the right hand propeller collided with the automated weather station and a guard booth before the aircraft came to a stop at position N2.5850 W72.6384 312 meters past the point of leaving the runway.

Colombia's Grupo de Investigacion de Accidentes & Incidentes Aereos (GRIAA) tweeted the accident occured at SKSJ (San Jose del Gua) on "07/06/2014" at 15:14Z (20:14L), an investigation has been opened.

No weather data are available.

The Aviation Herald came across the tweet during research of information describing an accident of HK4728 this week (second week of July 2014) and identified the date as Jul 6th, not 7th of Jun due to both date notations mm/dd/yyyy and dd/mm/yyyy widely used thus led to believe both photos released by GRIAA concerned the same occurrence until a reader made us aware of the error. We apologize for the error now corrected.

San Jose del Guaviare (San Jose del Gua) features a runway 01/19 of 1500 meters/4920 feet length.

Colmbia's GRIAA released their final report in Spanish concluding the probable causes of the serious incident were:

- Tyre #2 (inboard left main) burst
- Delayed decision to reject takeoff due to an unidentified vibration of the aircraft caused by the burst tyre
- Improper handling of emergency brakes by a crew member, not qualified to operate as a flight engineer, which caused the loss of directional control and the runway excursion
- Loss of control over ground
- Runway excursion

The aircraft received damage to the right hand side of the fuselage, the right hand propeller including the fracture of the axle, engine nacelle, right main gear and left inboard main wheel. The automated weather station as well as the security guard booth at the aerodrome were damaged by impact by the right hand propeller, the equipment of the weather station was destroyed.

The commander (57, ATPL, 8,490 hours total, 5,422 hours on type) was assisted by a first officer (23, CPL, 419 hours total, 227 hours on type). An unlicensed board technician occupied the flight engineer's seat.

The GRIAA analysed that the technician in the flight engineer's seat had asymmetrically pulled the emergency brakes handles disabling the brakes pedals for both pilots causing the loss of directional control, that the pilots until that point had regained by applying asymmetric brakes pressure correcting the aircraft's position from close to the left edge of the runway back onto the runway center line.

The GRIAA analysed that the #2 tyre burst when the aircraft was below 100kph and had travelled 638 meters/2090 feet. Takeoff was rejected at a speed above 100kph when the aircraft had travelled 963 meters/3160 feet, the aircraft went off the runway 1153 meters/3780 feet past the runway threshold at a speed of 106kph/57 knots. The flight data recorder registered +1.76G when the right hand propeller collided with the antenna mast of the weather station. The aircraft came to a stop 1456 meters past the runway threshold.

The weather, light drizzle, contributed to the runway excursion by decreasing the friction while on wet grass.

The GRIAA analysed that the location of the emergency brakes handles at the aft end of the center pedestal made it difficult for either pilot to operate the handles.

The GRIAA analysed that the onboard technician occupying the flight engineer's seat had not been licensed to operate as a flight engineer. However, according to the Technical Manual of the aircraft only 5 hours of flight in normal operations were required to obtain the qualification to operate as a flight engineer. However, the fact that the technician operated the emergency brakes without being qualified to do so has to be rated a "routine violation" because this type of operation was permitted by the airline without assessment of the suitability of such operation.

Metars:
SKSJ 071700Z 00000KT 7000 DZ BKN015 OVC040 XX/XX AXXXX APCLO
SKSJ 071600Z 00000KT 6000 RA BKN015 OVC030 XX/X AXXXX APCLO
SKSJ 071500Z VRB00KT 6000 HZ SKT005 OVC015 24/23 A2994
SKSJ 071400Z 05003KT 6000 HZ OVC010 24/22 A2993 RMK/AD OPER IMC
Incident Facts

Date of incident
Jun 7, 2014

Classification
Accident

Airline
Aer Caribe

Destination
Mitu, Colombia

Aircraft Registration
HK4728

Aircraft Type
Antonov An-26

ICAO Type Designator
AN26

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