What happened
On December 9, 2020, a Robinson R44 II helicopter, registration TG-SYR, was performing a private flight when it struck an obstacle during its landing sequence. The aircraft was attempting to land at a helipad located within the Aldosa S.A. factory premises, near KM 166 of the Jutiapa-Jalapa route in Guatemala. During the approach, the helicopter collided with a mound of gravel and solid waste material situated adjacent to the landing area. The impact caused severe damage to the tail rotor blades, the tail rotor drive shaft, and the lower protective tube, as well as damage to the 90-degree gearbox supports. The pilot and passengers were able to egress the aircraft uninjured.
The investigation
The DGAC/UIA investigation confirmed that the aircraft was in an airworthy condition and all maintenance requirements were up to date. Meteorological conditions at the time of the accident were favorable, with unlimited visibility and calm winds. The investigation focused on the landing site, noting that the landing area used by the aircraft was not registered with the DGAC Infrastructure Department. Investigators found that the landing site lacked standard markings, noting that the helipad symbol was too small and the area did not meet authorized standards. The investigation also examined the physical constraints of the site, specifically the proximity of the debris mound to the landing path.
Findings
- The primary cause of the accident was the collision with a mound of gravel and waste material located next to the landing area.
- The landing area was a confined space with significant obstacles near the approach and departure paths.
- The landing site was not a registered or authorized helipad under the DGAC Infrastructure Department.
- The helipad markings were insufficient, featuring a symbol that was too small and did not meet standard regulatory dimensions.
Safety action
- It is recommended that the Airport Infrastructure Department evaluate the safety of the landing area and require the removal of obstacles from the takeoff and landing paths to meet minimum regulatory requirements.
- Operators should avoid landing in confined areas or sites with significant obstacles that do not provide sufficient clearance for safe normal or emergency maneuvers.