We have already discussed the problems resulting from “mixed mode” and have proposed a more gradual introduction process which would avoid risk to the UK ATC system and allow Mode A/C transponders to die naturally when “mixed mode” is switched off. We strongly recommend that altitude encoding transponders should be encouraged for voluntary fit in light aircraft because of the safety benefits from interoperability with ACAS systems in fast jets flying at low level in class G airspace. That is a real and quantifiable safety risk to our sector.
However, the proposed transition arrangements would discourage the fitment of recycled Mode A/C transponders after March 2009 because the CAA will no longer issue exemptions. There is no safety or business case for this date and operators should be encouraged to fit recycled equipments right up to the date that “mixed mode” is switched off. We have already explained why this will not adversely affect the RF environment and the decision on return on cost must be left to the operator and not prescribed by the regulator who has no knowledge of the circumstances.
These equipments could then be useful right up to the date that they die naturally when “mixed mode” finishes and the equipments will no longer work.
Taking this up will enable simplification of the exemption rules for new-build aircraft as that would be subsumed by this proposal.
Links:
What the LAA Thinks of the Consultation
Why Mode S Transponders and Not A or A/C
Transition and Exemption Arrangements
Deadline 31st May 2008
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