Proposed amendments to Part 139H MOS – Aerodrome Rescue and Fire Fighting Services - (CD 2501AS)

Closes 17 Apr 2025

Policy topic – fire extinguishing agent performance criteria

Proposed Policy 1 – Level C foam

Add performance level C foam to the table of extinguishing agents.

Policy Aim

Alignment with Annex 14 to the Chicago convention - Volume I - aerodrome design and operations to allow use of performance level C foam.

Question 1: Do you agree with adding performance level C foam to the table of extinguishing agents?

Paragraph 7.1.1.1 - Table

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Proposed Policy 2 – conditional replacements and substitutions

Allow the replacement of water by a complementary agent for aerodrome categories 1 and 2for foam substitution meeting performance level A.

Policy Aim

Maintain consistency with Annex 14 to the Chicago convention - Volume I - aerodrome design and operations and remove:

  • the ability to replace water with a complementary agent for category 3 to 10 aerodromes
  • substitution of water for foam meeting performance level B.

Question 2: Do you agree with only allowing the replacement of water by a complementary agent for aerodrome categories 1 and 2 and only allowing for foam substitution meeting performance level A?

Paragraph 7.1.1.6 and 7.1.2.1

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Proposed Policy 3 – limited reserve supply

Allow a reserve supply of complementary agent and expellant gas cylinders equivalent to only 100% of the quantities of those agents.

Policy Aim

Amend the MOS Part 139H reserve requirement of complementary agent and expellant gas cylinders to 100%, excluding category 1 and 2 aerodromes that have replaced up to 100% of water with complementary agent) (it is currently equivalent to 200% of the quantities of those agents). Amending this reserve requirement to 100% would align Australia with the reserve requirements in Annex 14 to the Chicago convention - Volume I - aerodrome design and operations.

Question 3: Do you agree to allowing a reserve supply of complementary agent and expellant gas cylinders equivalent to only 100% of the quantities of those agents?

Paragraph 7.1.3.1

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