Aerosucre Colombia

The following findings were identified:
- Inadequate flight planning by the operator of the aircraft, and by the crew, by failure to properly perform dispatch procedures, takeoff performance calculations and verification of limitations imposed by operational conditions of the aerodrome according to the configuration of the aircraft.
- Wrong crew decision making by not considering a key aspect affecting aircraft performance, such as the prevailing tailwind at takeoff.
- Erroneous selection of takeoff speeds V1/VR and V2, by the crew, corresponding to an aircraft without modification in its flap system, which led to rotate the aircraft with five more knots of speed, increasing the takeoff run.
- Erroneous rotation technique applied by the Pilot, delayed maneuver that extended the long takeoff run even more.
- Loss of components (landing gear, trailing inboard flap right) and damage to functional systems (loss of engine power n°3 and hydraulic system) necessary to control the aircraft in flight.
- Loss of control in flight generated by asymmetries of lift, power and emptying of the main hydraulic systems that exceeded the capacity of the crew and made it impossible to maintain adequate directional control and stability of the aircraft.
Contributing Factors:
- Non-compliance with the Aeronautical Regulations by the operating company of the aircraft, operating to an aerodrome unsuitable for the operation of B727-200 equipment, which, in addition, was not authorized for that type of aircraft in the company's Operating Specifications, approved by the Aeronautical Authority.
- Lack of standardization and supervision of the operating company of the aircraft, allowing the operation of the B727-200 equipment, to which a modification had been applied to the flap system, with the reference tables of speeds corresponding to the aircraft without modification.
- Execution of take-off with a weight that exceeded the maximum value established in the aircraft performance charts for the conditions prevailing at the Germán Olano airport.
- Omission of the crew by not activating the Standby hydraulic system, which might have allowed emergency hydraulic pressure, to regain control of the aircraft.
- Lack of supervision by the Aeronautical Authority, which allowed for several years the operation of equipment B727-200 of the company operating the aircraft at the Germán Olano aerodrome in Puerto Carreño, when the characteristics of the aerodrome did not allow it and without the operator being authorized to operate equipment B727-200 in that aerodrome.

Following a flight under IFR mode, the crew decided to continue the approach by night and limited visibility under VFR mode, without meeting the minimum requirements for this type of operation. This decision led the aircraft descending at an unsafe altitude until it collided with a television antenna and crashed. The following contributing factors were identified:
- Poor approach planning,
- Poor judgment,
- Violation of IFR procedures,
- The crew's inability to circumvent the obstacle on the ground by encountering unforeseen circumstances beyond their capacity.

Failure of the right main gear during taxi due to the presence of corrosion in the trunnion.

It was determined that the tread on the left front tyre (nose gear) deflated and broke off during takeoff, causing severe vibrations. This caused the antiskid system to be unserviceable and the aircraft could not be stopped on the remaining distance as the runway surface was humid. It was also reported that no information were available from both CVR and FDR systems. At the time of the accident, the total weight of the aircraft was 1,461 kilos above MTOW, making the decision speed (V1) to be higher by reducing the stopping distance, which was insufficient when discontinuing the pilot controls takeoff in wet runway conditions.

Controlled flight into terrain.

It is believed that the cargo was not properly secured in the cargo compartment.