Locals in Narromine, Coonamble, Nyngan and Cobar may notice a plane flying a little lower than usual tomorrow.

There's no need for alarm.

A twin-engine Cessna Conquest is scheduled to cover the area around the aerodromes in each town to check for any new obstacles in the take-off and landing paths.

Civil Aviation Safety Authority (CASA) spokesman Steve Creedy said the pilot may fly as low as 60 metres.

 "Safety is a priority for CASA and this program is aimed at ensuring that pilots following published instrument flight procedure paths – where they use cockpit instruments to land and take off from aerodromes in your area – can do so safely," Mr Creedy said.

"We may find obstacles that have been built since the procedure was designed or last revalidated, although there are requirements for people to advise the appropriate authority.

"We also examine whether the aerodrome infrastructure supports the procedures, looking at factors such as the runway width, the wind direction indicators (windsocks) and aerodrome lighting."

The twin-engine plane is scheduled to fly over the Coonamble area on 6 November. [IMAGE: River McCrossen]

"During the checks we record our flight tracks over the ground as well as our altitude and airspeed which we can reference later, overlaying those tracks against the actual procedure designs for further evaluation.

"We often cover a number of aerodromes on each mission."

A safety checking aircraft will also fly over Condobolin on Friday 7 October.

Mr Creedy said the process may take one to two hours per location, depending on factors like air traffic, obstacles and the complexity of the flight procedure CASA are checking.

Obstacles can include towers, trees, masts or buildings, which are marked on charts.

Aerodromes are generally checked every five years. 

CASA makes the checks at around 340 aerodromes and helicopter landings in Australia and as far as Antarctica.

Instrument flight procedures are available in the Australian Aeronautical Information Publication.