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The track log shows a gap in the data around the time the incident occurred. Is it typical for gaps to exist in that route (out of range for any ADS-B receiver) ?

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It is common for flights to have gaps in live data for portions of Aus<->NZ flights over the Tasman sea, yes.

In ADS-B the location is determined by the airplane and is periodically broadcast. A gap in data could/would mean a gap in broadcast or positioning.

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