4.2.021
2021-10-29
Added degree-specific holdover times (DSHOT)
The DSHOT database is an extension of the FAA and TC HOT Guidelines. The data it contains is derived from the same natural snow test data that is used to calculate the snow HOT values within the standard HOT tables. Within a typical HOT table, HOTs are provided for defined temperature ranges (e.g., -3°C to -8°C). The HOTs provided within a given temperature range are based on the coldest temperature of that range. Within the DSHOT database, specific HOT values are provided for each Type II, III, and IV fluid at all temperatures decrementing down to a given fluid's LOUT. A 1°C safeguard is incorporated in all DSHOT calculations
The DSHOT take into place if the flaps were deployed at the time of deicing/anti-icing, provided the correct selection has been made in the HOT Screen.
Any operator making use of the DSHOT data in a modified format shall employ a detailed verification process to ensure that the data presented is accurate and complete. This verification process shall consist of a series of manual checks of the DSHOT data within a DSHOT data presentation (e.g., a modified paper table or an eHOT app) against the corresponding values published in the most recent FAA DSHOT database publication.
A record of the verification process shall be kept and maintained and this record shall clearly demonstrate that all DSHOT values within a data presentation have been verified. The verification process shall be updated and/or repeated on an annual basis (or whenever the DSHOT database or its data presentation is updated, whichever comes first).
Due to this requirements, the DSHOTs must be actively enabled in the settings (Operations Page), where the user gets presented with the requirements and will be asked for an acknowledgement. If you need assistance in the verification process, please contact inquiries@mr-apps.ch and we'll gladly help.