Feature - 2005-2006 Ground Icing Operations Update

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In July 2005, the Winter 2005-2006 Holdover Time (HOT) Guidelines were published by Transport Canada. Check out the following Web site for all the details: www.tc.gc.ca/eng/civilaviation/standards/commerce-holdovertime-menu-1877.htm.

A summary of this year's changes to the HOT Guidelines follows:

One new TypeII fluid was evaluated last winter to assess its holdover time performance. This fluid will not be commercialized this year. Two new TypeIV fluids were evaluated last winter to assess their holdover time performance. One of those fluids, Octagon Maxflow, will be commercialized this year. A new manufacturer-specific holdover time guideline table has been generated for this fluid. Furthermore, the availability of this new fluid required two changes to the Society of Automotive Engineers (SAE) TypeIV generic table in the snow column (for temperatures of -3°C and above, and below -3°C to -14°C at 75/25 concentration).

There were four additional changes to the SAE TypeIV generic table resulting from the removal of obsolete data:

  1. Freezing fog column, -3°C and above at 100% concentration;
  2. Snow column, -3°C and above at 100% concentration;
  3. Snow column, -3°C and above at 75/25 concentration; and
  4. Snow column, below -3°C to -14°C at 75/25 concentration).

Several years ago, a need was identified for a de-/anti-icing fluid that had longer holdover times than a TypeI fluid, but a lower viscosity than a TypeII or IVfluid, for use on aircraft with lower rotation speeds. Clariant produced the Safewing MPIII 2031 ECO fluid, which met all the applicable requirements and is qualified as a TypeIII fluid. A TypeIII generic fluid table was produced last year based on the holdover times of this fluid at 100% fluid concentration.

The holdover time performance of the Clariant Safewing MPIII 2031 ECO fluid was further evaluated last winter for fluid concentrations of 75/25 and 50/50. As a result, HOT guidelines for these additional concentrations have been added to the TypeIII table this year. There were no HOT tests performed on any TypeI fluids and therefore there are no changes to the TypeI fluid guidelines.

If you are interested in understanding or learning more about fluid testing and qualification, refer to the following documents from the SAE: AMS1424 and AMS1428. These and other documents are available for purchase from the SAE at the following Web site: http://www.sae.org/.

TP14052, Ground Icing Operations Update, has undergone significant changes this year, including a new name. This reference document should continue to be used in conjunction with the HOT Guidelines.

In April 2005, TP14052 was reissued as TP14052 Edition2: Guidelines for Aircraft Ground Icing Operations. The publication of this second edition was made possible thanks to the dedicated efforts of an Industry/Transport Canada working group. The group spent over two years contributing and refining material for the new edition. Industry members included: air operators, airport authorities, equipment manufacturers, fluid manufacturers, ground icing service providers and researchers. Transport Canada members included representatives from: Commercial and Business Aviation, General Aviation, Occupational Health and Safety, Aerodrome Safety and Environmental Systems.

The second edition covers the following ground icing areas in detail:

  • Ground Icing Program Guidelines
  • Roles and Responsibilities
  • Quality Organization
  • Training and Testing
  • Personnel Safety
  • Communications
  • Fluids
  • Equipment
  • Preventative Measures and De/Anti-icing Procedures
  • Holdover Time Guidelines and Associated Procedures
  • Operational issues
  • Environment
  • Facilities
  • Emergencies
  • Due Diligence
defined. A reference section to other ground icing documents is included for those seeking further detail and information. TP14052 is available for download at the following Transport Canada Web site: www.tc.gc.ca/eng/civilaviation/standards/commerce-holdovertime-menu-1877.htm. If you have any questions or comments regarding the above, please contact Doug Ingold at INGOLDD@tc.gc.ca.

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