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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > Radio Navigation > For one interrogator, synchronous garbling from overlapping main Mode A/C reply frames (excluding the SPI extension and unrelated FRUIT replies) can occur when:

142 - ATPL Question Bank in English - For one interrogator, synchronous garbling from overlapping main Mode A/C reply frames (excluding the SPI extension and unrelated FRUIT replies) can occur when:

Question 142 - Radio Navigation - ATPL - Airline Transport Pilot Licence

Two or more aircraft are within the same interrogation beam with a slant-range difference of less than approximately 1.7 NM.

Aircraft are interrogated in separate beam directions with reply frames that do not overlap in time.

Aircraft are in separate beam directions and their replies are separated by more than one complete main reply-frame duration.

Aircraft are within the same beam but have a slant-range separation large enough to prevent their main reply frames overlapping.

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