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In any event, in something like this there should be a "demonstrated capability" route.
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The renewal limits are -35db (IIRC) max loss. So, you could have one perfect ear, and one which is -36db. No IR.
This is what the CAA website says
It will be seen that there is a higher hearing threshold for the initial JAR Class 1 examination than for renewal or revalidation. Initial Class 1 applicants who fail to meet the initial hearing standards, but who reach the renewal/revalidation standards, should contact the UK CAA Medical Division to discuss their options.
There is usually some loss of hearing as a pilot’s career progresses (often due to noise induced hearing loss). If the audiogram figures reach a level 5 dB less than the renewal figures above, then an annual audiogram is required. However the hearing of experienced pilots at re-certification can be worse than the levels above, as JAR-FCL 3 Appendix 16 to Subparts B and C, paragraph 2 (b) states that: ‘If satisfactory hearing in a noise field corresponding to normal flight deck working conditions during all phases of flight can be demonstrated, recertification may be considered by the AMS (Aeromedical Section)’. This will usually take the form of a flight (real or simulated) with a training captain or instructor who reports that all tasks involving hearing were performed satisfactorily.