4.4.0
2023-09-29
- Updated Holdover Times for Winter Season 2023-2024
- WinterOPS has been brought to the newest regulations FAA and EASA. HOT and DSHOT Updates have been done.
New Fluids
- Addition of fluid Aero Mag 2000 SYR LLC DeiceX PG ADF Concentrate
- Addition of fluid ALAB International PROFLIGHT EG1
- Addition of fluid Topan LLC TOPAN TYPE I
- Addition of fluid Xinjiang Zhongtian Liyang Aviation Newmaterial Technology Co., Ltd Clearice-IB
Removed fluids
- Removal of fluid Kilfrost Limited Kilfrost DFSustain
- Removal of fluid LNT Solutions LNT P188
- Removal of fluid Newave Aerochemical FCY-2 Bio+
- Removal of fluid Clariant Max Flight 04
- Removal of fluid JSC RCP Nordix Defrost EG 4
- Removal of fluid Shaanxi Cleanway Cleansurface IV
- New weather category Snow mixed with Freezing Fog & ice pellets mixed with drizzle added
- For detailed updates, please refer to the official regulatory documents.
Decoders
- New Global Reporting Format implemented into SNOWTAM Decoder
- Small change to Snow Visibility notes
4.3.2
2022-12-01
- Added Aircraft Performance Values in the Operations Settings. These are relevant to calculate the LOUT according to the Performance and Aerodynamic Acceptance Values in Tables 54 and following. New Middle Speed Values have been introduced for Fluid III (AeroClear MAX), all the other Fluids only have high and/or low speed Values.
*If uncertain whether the aircraft to be treated conforms to the low speed, the middle speed, or the high speed aerodynamic test, consult the aircraft manufacturer. The aerodynamic test is defined in SAE AS5900 (latest version).
- Default value is HighSpeed Aircraft Performance
- The V Rotate Speeds are only used for allowance time calculations and are not used for the LOUT calculations anymore according to the new regulations.
- Updated Snowfall Intensities Decoder to new regulations (now FAA, EASA and TC have been harmonized and all use the same values)
- Bugfix in the Snowfall intensities Temperature Selection for Fahrenheit
- Added Type I Fluids Sky-Go PG 80 & Safewing MP I LFD 80 Pre-Mix 55%
- Added Type II Fluids Ice Clear II & COREICEPHOB Type II
- Added Aeroclear Max values for Medium Speed Aircraft
- Added new Weather Type of Ice Crystals mixed with Freezing Fog, Ice Crystals mixed with Freezing Mist and Snow mixed with Ice Crystals
- 4.3.1 was not showing any Holdovertimes for SAE Types I, II, IV - this has been fixed now
4.2.0
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.
4.1.0
2020-09-08
• Updates for the 2020-2021 Guidelines for FAA/EASA and Transport Canada
• Major Changes in Transport Canada very light snow times and application guidelines
• Introduced Snowfall intensities as a function of visibility converter
• Minor bug-fixes
4.0.4
2020-01-15
Added Application Guidelines for all Fluid Types and different scenarios (anti-icing or de-&anti-icing) and different temperature ranges.
4.0.2
2019-11-26
Added search capability for fluids:
- for "all fluids" Subscription in the Hold Over Time Tab
- for all subscriptions in the Qualified Fluids Tab
- search for Fluid Name or Fluid Manufacturer
- refine search for specific fluid type only
Minor Bug fixes
4.0.1
2019-11-18
Added Transport Canada Holdover Times
Some design & dark mode improvements
4.0
2019-11-14
Holdovertimes for 2019-2020 Season are now available in the application.
Transport Canada Regulations will be added in the next few days.
Allowance Times for weather like ice pellets or small hail added.
Completely rewritten the application to ensure stability and quality of the application.
3.0.1
2019-02-12
• FAA Holdovertimes Winter 2018-2019
• EASA Holdovertimes Winter 2018-2019 (see desclaimer below)
• Updated Fluid application guidelines
• Updated qualified fluids, now with LOUT and viscosity details
• Wingsurface selector added
• Flapsetting selector added
• Precipitation Speed selector added
As there are no more AEA Anti-/De-icing guidelines, EASA has defined in the Safety Information Bulletin SIB 2017-11, that the FAA Holdover Time Guidelines are to be used.
Due to the different structure of the FAA Holdovertime tables, the Holdovertime determination needed to be completely redesigned and the application guidelines needed a revision, which unfortunately took a lot of time developing and thorough testing.
The FAA Holdovertimes sometimes differentiate between aluminium wingsurfaces and composite wingsurfaces. This selection has been added to the new version.
Additionally the app can now differentiate if the flaps/slats are "in" during anti-icing or deployed only shortly before take/off or if the flaps/slats have already been deployed during anti-icing.
For certain precipitations the FAA Holdovertime tables provide values for different precipitation speeds. For example "very light", "light" or "medium" Snowfall have two values for holdovertimes. A higher protection time for low precipitation speed and a lower protection time when high precipitation speed is present.
The Holdovertimes for the Generic Fluids Types I, II, III and IV are available.
Additionally the Qualified Fluids have been updated in the application and now show the tested Lowest Operational Use Temperatures and the lowest on-wing viscocity.
The additional information on weather and de-icing are based on the former AEA guidelines.
To further ensure yearly updates of the holdover times, the guidelines starting for winter 2019-2020 will be available through in-App purchase. There will be two packages, one for just the generic fluids and one for the specific fluids.
Additionally the application will be redeveloped and designed to the newest iOS.