What happened
On 20 March 2026, the pilot of a Cessna 206H was conducting a private flight from a private property north-north-east of Clermont, to Mackay, Queensland (Figure 1). The flight was conducted under visual flight rules (VFR).[1]
Figure 1: Flight path direction
Source: Google Earth, annotated by the ATSB
Prior to departure, the pilot reviewed various aviation weather forecasts from the Bureau of Meteorology and the Windy.com application. The pilot also contacted air traffic control (ATC) at Mackay Tower via phone for the local weather. The controller stated that conditions to the south‑west of the field on the pilot’s planned track were not visual meteorological conditions (VMC)[2] and that the visibility was poor at Mackay.
The pilot reported they were unable to recall the specific details of the discussion, however noted that cloud and rain bands were passing through the area and had assessed the conditions as suitable for flight. The aircraft departed approximately 30 minutes later at 1722.
At approximately 1816, while on descent to Mackay, the pilot encountered a rain band and altered their track north in an attempt to maintain VMC. They considered turning back and diverting to their nominated alternate aerodrome, Nebo (Figure 1), however visibility continued to deteriorate, and the pilot was conscious of the elevated terrain in the area.
At this time, there was approximately 20 minutes of usable daylight remaining to maintain a discernible horizon and visual reference to the ground. The pilot initiated a climb, monitored the instruments, and activated the autopilot to keep the wings level as a precaution against spatial disorientation.
A tower controller at Mackay observed the aircraft on their tower situational awareness display (TSAD)[3] to the south‑west of the aerodrome, outside of controlled airspace and tracking for Mackay. The aircraft drew the controller’s attention as it was descending while changing track. The controller tried to contact the aircraft and established communication on the second attempt.
On initial contact, the controller confirmed that the aircraft was not operating in VMC, advised the pilot of the applicable minimum sector altitude (MSA),[4] and suggested the pilot climb to 5,000 ft to achieve a safe altitude. The pilot climbed and advised the controller that the autopilot was activated.
The tower controller then informed other parties of the aircraft inadvertently entering IMC,[5] including: the relevant approach controller, the Mackay Aviation Rescue Fire Fighting Service (ARFF), and the Mackay airport safety officer (ASO).
The tower controller established that the aircraft had one person on board and 5 hours of endurance. They suggested the pilot track to the east for Mackay once the aircraft reached 5,000 ft. During this time, the aircraft remained in IMC.
The aircraft was then transferred to the approach controller who provided assistance to the pilot to facilitate a safe descent. Once the pilot reported visual conditions, the aircraft was transferred back to the tower controller, who issued a visual approach and landing clearance. The aircraft landed without further incident at 1831, and all relevant parties were notified.
Safety message
The ATSB booklet Accidents involving Visual Flight Rules pilots in Instrument Meteorological Conditions (AR-2011-050, revised 2019) provides guidance on avoiding VFR into adverse weather. The booklet highlights that conducting thorough pre-flight planning is the best defence against flying into deteriorating weather. Pilots are encouraged to make conservative decisions when considering how forecast weather may affect their flight. Establishing a ‘personal minima’ can help to provide additional operational margins which account for factors such as weather, time of day, experience and recency. VFR flight into forecast or observed non-visual conditions exponentially increases the risk of a VFR into IMC scenario.
For pilots operating under VFR, inadvertent entry into IMC can be a disorienting experience due to the loss of external visual references required to maintain aircraft attitude and orientation. If a VFR pilot enters IMC, seeking assistance from ATC, where available, can support the pilot to manage the situation and achieve a safe outcome.
In addition, where fitted and the pilot is appropriately trained in its use, the autopilot can also assist in maintaining stable aircraft control following inadvertent entry into IMC. Pilots are encouraged to become familiar with the operation and limitations of installed autopilot systems to support effective use in such circumstances.
About this report
Decisions regarding whether to conduct an investigation, and the scope of an investigation, are based on many factors, including the level of safety benefit likely to be obtained from an investigation. For this occurrence, no investigation has been conducted and the ATSB did not verify the accuracy of the information. A brief description has been written using information supplied in the notification and any follow-up information in order to produce a short summary report, and allow for greater industry awareness of potential safety issues and possible safety actions.
[1] Visual flight rules (VFR): a set of regulations that permit a pilot to operate an aircraft only in weather conditions generally clear enough to allow the pilot to see where the aircraft is going.
[2] Visual Meteorological Conditions (VMC): an aviation flight category in which visual flight rules (VFR) flight is permitted – that is, conditions in which pilots have sufficient visibility to fly the aircraft while maintaining visual separation from terrain and other aircraft.
[3] A Tower Situational Awareness Display (TSAD) provides limited surveillance information to tower controllers.
[4] Minimum Sector Altitude (MSA) is the lowest altitude which may be used which will provide a minimum clearance of 1000 FT above all objects located in an area.
[5] Instrument meteorological conditions (IMC): weather conditions that require pilots to fly primarily by reference to instruments, and therefore under instrument flight rules (IFR), rather than by outside visual reference. Typically, this means flying in cloud or limited visibility.