Transponders have registers for Mode S data and configuration. These registers are updated periodically to provide Mode S services such as ADS-B Airborne Position squitter.
DO-260B and similar documents have Register Allocation Tables that states maximum update intervals for each register(if applicable).
But there is also a register timeout mechanism that states "if a register can not be updated within twice the maximum update interval, it shall be zeroized".
So, what happens if certain register is updated at every (1.5 * maxUpdateInterval) ? Are these maximum update times mere suggestions or is there another rule that forces us to update registers at most maximum update interval?