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Chris Pawley

pending 2019-06-20 Non-Precision approach clearances

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Chris Pawley

Effective 20 June 2019

 

In contrast to precision approaches, non-precision approaches are at risk of failing to ensure correct tracking of the vertical path through altimetric calibration error. Should a plane make a non-precision approach with the wrong altimeter setting, they will fly the approach consistently too low or too high. Where (for example) an ILS approach is conducted, such an error is detrimental to ensuring separation in the intermediate approach but is corrected for in the final approach by ground based navigational equipment.

 

In order to correct for any errors through altimetric calibration, approach controllers are instructed to issue the relevant QNH with the approach clearance for aircraft conducting a non-precision approach (including RNAV approaches)

 

 

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