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Where a supplementary speech audiometry test is required, this can be performed by most audiologists. Results are usually presented as a percentage of words correctly heard at different decibel levels.
If the applicant fails the speech-based hearing test, in some cases an in-flight test may be offered if he/she has a high level of aeronautical experience. Such an operational check will involve evaluation of relevant aspects of the applicant's hearing by a CASA Flying Operations Inspector or an Authorised Testing Officer with test material transmitted from a control tower. Ideally the test should be conducted in the Class of aircraft that is the same as that which the applicant normally operates.
Further information is available from the Aviation Medicine Section.