However one more quesiotn do you think that there is a need to declare local/full emergency alert at the airport when an aircraft is landing with BA poor?
No, but over here the duty TWR atco can order "Increased prepearedness"
(i.e. manning the tenders outside the fire station, but no alert outside airfield fire service)
From the Norwegian CAP, rough translation
Increased preparedness undertaken when an aircraft is / are believed to be in difficulties, however, is of such nature that the aircraft can normally make a safe start and landing. Examples of factors that indicate increased readiness:
- Strong crosswind
- Slippery contaminated runway or other deterioration of rwy conditions.
- Reduced visibility that makes ATC unable to see the maneuvering area.
The key point is "believed to in difficulties", which makes it a judgement call by ATC. It all comes down to knowledge and experience.
SAS 737 landing on 2500m runway in dry snow with breaking action est poor in NIL wind -> No action taken
Pegasus 737 landing on same runway in wet/slush conditions with 15 knots crosswind and breaking action est poor?
....well that might.....