At the time of the last tyre change, crack initiation at the bearing bore shoulder radius was an emerging issue with no requirement for mandatory inspection of this area during a tyre change.
There was no formal risk assessment process in use at the operator’s Horn Island base.
The operator’s winching procedure did not include the requirement to confirm adequate hover reference existed overhead an intended winch area prior to deploying personnel on the winch.
The Registered Operator's maintenance control practices did not ensure compliance with all Airworthiness Directives.
Information contained in the approved flight manual and pilot's operating handbook was not applicable to the engine that was fitted to the aircraft.
There was the potential for the incorrect use of the dipstick to result in the over-reading of the fuel quantity.
Maintenance processes did not identify or correct the corrosion in the generator control units.
The floor sealing around the forward galley was not of sufficient extent to prevent liquids from passing through to the under floor area.
Maintenance processes did not identify or correct the deterioration of the galley floor sealing
The location of the decompression panel and absence of cabin floor sealing above the main equipment centre increased the risk of liquid ingress into the aircraft’s electrical systems.
The galley drain operation and maintenance processes did not adequately prevent blockage and overflow of the aircraft’s drain lines.
The United States Federal Aviation Administration regulations and associated guidance material did not fully address the potential harm to flight safety posed by liquid contamination of electrical system units in transport category aircraft.
The priority level of the battery discharge messages that were provided by the engine indicating and crew alerting system did not accurately reflect the risk presented by the battery discharge status.
Maintenance processes did not identify or correct the deterioration of the drip shield.
The Aerial Agricultural Association of Australia suggestion that an additional hazard identification check be carried out prior to a cleanup run was not routinely practiced by the pilots, or monitored by the operator.
The aircraft operator’s documented design objectives did not explicitly require the protection of non-structural systems from liquid contact or ingress.
The operator’s flight crew quick reference handbook did not include sufficient information for flight crew to manage the emergency.
Maintenance processes did not identify or correct the inoperability of the forward drain line heater.
The removal of fluid quantity markings from, and unapproved modifications to the helicopter’s spray tank by the operator increased the risk of overweight operations
The recording lineworker’s shoulder restraint had been repaired using an unapproved stitch pattern and density.
