Readback of transition level
Join Date: Mar 2000
Location: Edinburgh
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Just to add to this debate, what happens in a TMA environment where min stack is based on one aerodromes QNH? The other aerodromes within the TMA could potentially have a TL which is above min stack.
Join Date: Mar 2000
Location: Edinburgh
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topdrop,
The TA, is the same, that's the point. TA and TL are based on local QNH but the min stack level in a TMA is based on one specific aerodromes QNH.
So for example in the Scottish TMA Edinburgh and Glasgow have a TA 0f 6,000 feet. The transition level is then calculated based on the local QNH at each airport and broadcast by ATIS. However min stack within the Scottish TMA is always based on the Glasgow QNH. Therefore at the boundary pressures where min stack level is changed, if the QNH at Edinburgh is lower than at Glasgow you could be told, for example, to descend to FL070 and then told the TL is FL075.
The TA, is the same, that's the point. TA and TL are based on local QNH but the min stack level in a TMA is based on one specific aerodromes QNH.
So for example in the Scottish TMA Edinburgh and Glasgow have a TA 0f 6,000 feet. The transition level is then calculated based on the local QNH at each airport and broadcast by ATIS. However min stack within the Scottish TMA is always based on the Glasgow QNH. Therefore at the boundary pressures where min stack level is changed, if the QNH at Edinburgh is lower than at Glasgow you could be told, for example, to descend to FL070 and then told the TL is FL075.
