Document ID: chunk:federal_register_of_legislation:F2009L01576:body:0:p2
Version: federal_register_of_legislation:F2009L01576
Segment Type: other
Provision Reference: 
Character Range: 2973–4177

times.  The blockage was created by carbon debris from the cartridge and from the burst disc of the Halon bottle.

             This water absorbing filter element is part of Halon Dual-Filter Assembly installed also in the Flow Metering System (FMS) of the cargo compartment Fire Extinguishing System used in the A330 and A340 aeroplanes.

             Blockage of the water absorbing filter element could lead to reduction of Halon outflow, leading to incapacity to maintain fire extinguishing agent concentration.  Combined with fire, this could result in an uncontrolled fire in the affected compartment, which would constitute an unsafe condition.

             To avoid water absorbing filter element blockage, this AD requires replacement or modification of the Halon dual-filter assemblies of the lower deck cargo compartment fire extinguishing system:

                  - in the forward cargo compartment for aeroplanes fitted with Lower Deck Cargo Compartment (LDCC) and

                  - in the bulk cargo compartment for aeroplanes fitted with Bulk Cargo Rest Compartment (BCRC) fire extinguishing system.

James Coyne
Delegate of the Civil Aviation Safety Authority

27 March 2009