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The term "Base Effect", in the context of a specific aerodrome, refers to the potential for a gradual erosion of safety margins in the standard procedures of locally based operators.
Virtually every aerodrome has locally based aircraft, pilots and, in many cases, air traffic controllers. Over time, these individuals become familiar with the aerodrome environment, traffic flows and ATM procedures. This knowledge, in turn, can lead to the adoption of local deviations to normal protocols as a result of an enhanced level of "mutual trust" amongst the operators and between the operators and air traffic control. Although these adaptations might work well on a day to day basis, they may be deficient should an unplanned event occur.
- Loss of Separation
- Communication Guide for General Aviation VFR Flights
- Non-Standard Phraseology
- Air-Ground Voice Communications
- Frequency Congestion
- Visual Flight Rules (VFR)
- Instrument Flight Rules (IFR)
- Airborne Collision Avoidance System (ACAS)
- Standard Operating Procedures (SOPs)
Accidents and Incidents
- A319 / AS32, vicinity Marseille France, 2016 On 27 June 2016, an Airbus A319 narrowly avoided a mid-air collision with an AS532 Cougar helicopter whose single transponder had failed earlier whilst conducting a local pre-delivery test flight whilst both were positioning visually as cleared to land at Marseille and after the helicopter had also temporarily disappeared from primary radar. Neither aircraft crew had detected the other prior to their tracks crossing at a similar altitude. The Investigation attributed the conflict to an inappropriate ATC response to the temporary loss of radar contact with the helicopter aggravated by inaccurate position reports and non-compliance with the aerodrome circuit altitude by the helicopter crew.