GM1 ADR.OPS.B.035(b)(3) Operation in winter conditions

• ED Decision 2021/003/R found in: Aerodromes (139/2014) Part-ADR.AR Part-ADR.OR Part-ADR.OPS CS-ADR-DSN CS-HPT-DSN (Jun 2023)

GM1 ADR.OPS.B.035(b)(3) Operation in winter conditions ED Decision 2021/003/R INFORMATION ON ALKALI-ORGANIC RUNWAY DE-/ANTI-ICING SUBSTANCES During winter operations, the aircraft carbon brakes and open wheel/bay are exposed to alkali-organic salt runway de-/anti-icing substances during taxi, take-off and landing. A slush mixture of snow and alkali-organic salt de-/anti-icing substances could freeze onto the landing gear and inside the wheel well/bay. After landing gear retraction, the frozen slush deposits begin to melt. The resulting liquid flows into the core of the carbon brake, further contaminating the carbon discs. The presence of the alkali-organic salt creates a catalytic condition lowering the oxidation temperature of the carbon, resulting in structural deterioration of the carbon disc material and reducing the service life and long‑term efficiency of the brakes. It is very important that aircraft operators have information on the de-/anti-icing substances used at the aerodrome that they operate to and from, in order to assess the exposure of their aircraft to these substances and adjust their maintenance programme. The information, when provided in the RCR or in the AIP, should be given using the following abbreviations/words: (a) KAC, for potassium acetate fluids; (b) KFOR, for potassium formate fluids; (c) GAC, for glycerine acetate fluids; (d) NAFO, for sodium formate solids; (e) NAAC, for sodium acetate solids; (f) EG, for ethylene glycol fluids; (g) PG, for propylene glycol fluids; (h) UREA; and (i) SAND. GM1 ADR.OPS.B.035(b)(3) Operation in winter conditions ED Decision 2021/003/R INFORMATION ON ALKALI-ORGANIC RUNWAY DE-/ANTI-ICING SUBSTANCES During winter operations, the aircraft carbon brakes and open wheel/bay are exposed to alkali-organic salt runway de-/anti-icing substances during taxi, take-off and landing. A slush mixture of snow and alkali-organic salt de-/anti-icing substances could freeze onto the landing gear and inside the wheel well/bay. After landing gear retraction, the frozen slush deposits begin to melt. The resulting liquid flows into the core of the carbon brake, further contaminating the carbon discs. The presence of the alkali-organic salt creates a catalytic condition lowering the oxidation temperature of the carbon, resulting in structural deterioration of the carbon disc material and reducing the service life and long‑term efficiency of the brakes. It is very important that aircraft operators have information on the de-/anti-icing substances used at the aerodrome that they operate to and from, in order to assess the exposure of their aircraft to these substances and adjust their maintenance programme. The information, when provided in the RCR or in the AIP, should be given using the following abbreviations/words: (a) KAC, for potassium acetate fluids; (b) KFOR, for potassium formate fluids; (c) GAC, for glycerine acetate fluids; (d) NAFO, for sodium formate solids; (e) NAAC, for sodium acetate solids; (f) EG, for ethylene glycol fluids; (g) PG, for propylene glycol fluids; (h) UREA; and (i) SAND. ##### GM1 ADR.OPS.B.035(b)(3) Operation in winter conditions *ED Decision 2021/003/R* **INFORMATION ON ALKALI-ORGANIC RUNWAY DE-/ANTI-ICING SUBSTANCES** During winter operations, the aircraft carbon brakes and open wheel/bay are exposed to alkali-organic salt runway de-/anti-icing substances during taxi, take-off and landing. A slush mixture of snow and alkali-organic salt de-/anti-icing substances could freeze onto the landing gear and inside the wheel well/bay. After landing gear retraction, the frozen slush deposits begin to melt. The resulting liquid flows into the core of the carbon brake, further contaminating the carbon discs. The presence of the alkali-organic salt creates a catalytic condition lowering the oxidation temperature of the carbon, resulting in structural deterioration of the carbon disc material and reducing the service life and long‑term efficiency of the brakes. It is very important that aircraft operators have information on the de-/anti-icing substances used at the aerodrome that they operate to and from, in order to assess the exposure of their aircraft to these substances and adjust their maintenance programme. The information, when provided in the RCR or in the AIP, should be given using the following abbreviations/words: (a) KAC, for potassium acetate fluids; (b) KFOR, for potassium formate fluids; (c) GAC, for glycerine acetate fluids; (d) NAFO, for sodium formate solids; (e) NAAC, for sodium acetate solids; (f) EG, for ethylene glycol fluids; (g) PG, for propylene glycol fluids; (h) UREA; and (i) SAND.