21 CARGO VENTILATION & HEATING SYS PRES.pdf

21 CARGO VENTILATION & HEATING SYS PRES. (1)

SYSTEM INTRODUCTION

As an option on the Airbus single aisle family, the forward and aft cargocompartments can have a ventilation system. In addition, a heating systemmay be installed in either or both compartments. Note that the heatingsystem will only be installed along with a ventilation system.The operation for both compartments is similar so we will only look atthe forward cargo compartment. Air from the main cabin is drawn downinto the cargo compartment by the extract fan or by differential pressurein flight. After circulating through the compartment, the air is dischargedoverboard.The operation of the two isolation valves and the extract fan is controlledautomatically by the cargo Ventilation Controller (VC). One VC is ableto control either or both compartments.For the heating of the cargo compartment, the pilots select the desiredcompartment temp and hot bleed air is mixed with the air coming fromthe main cabin to increase the temperature if necessary. The supply ofhot air is controlled by the Cargo Heating Controller. Each heatedcompartment has a dedicated Cargo Heating Controller. Note that thereis NO direct air conditioning supply to the cargo compartments. Thepilots cannot add "cold" air to the compartments.

GENERAL FAMILIARIZATION COURSE - T4 (CFM 56) PART 2 OUT OF 2

21 CARGO VENTILATION & HEATING SYS PRES. (1) Nov 19, 2009Page 312

Single Aisle TECHNICAL TRAINING MANUALU

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SYSTEM INTRODUCTION




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CONTROL AND INDICATING

This section will highlight the control panels and indications for the cargoventilation and heating systems.

CONTROL PANELSOn the cockpit overhead panel, the CARGO HEAT panel containsthe controls associated with cargo ventilation and heating. Again,based on the customer options, several variations may be found:ventilation in either one compartment or both, or ventilation andheating in one compartment or both.For each ventilated cargo compartment there is an ISOLATIONVALVE P/B switch that controls the isolation valves. In the autoposition the cargo VC will automatically open and close the isolationvalves.In case of cargo smoke detected, the cargo ventilation controller willautomatically close the related isolation valves.For each heated compartment, the temperature selectors signal theassociated Cargo Heating Controller to move the trim air valves toadjust the temperature of the air entering the compartment.The forward cargo trim air system is fed from the cabin hot air valvebut the HOT AIR P/B switch controls the aft cargo compartment hotair valve.


21 CARGO VENTILATION & HEATING SYS PRES. (1) Nov 19, 200914


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CONTROL AND INDICATING - CONTROL PANELS




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CONTROL AND INDICATING (continued)

ECAM COND PAGEThe indications linked to the cargo compartments are displayed onthe ECAM COND page. Note that the indications are only displayedif the system is installed.




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CONTROL AND INDICATING - ECAM COND PAGE




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COMPONENT LOCATION

The isolation valves and extract fans of the forward cargo compartmentventilation system are located behind the compartment sidewall panels.The air inlets and outlets are protected by grills.




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COMPONENT LOCATION




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COMPONENT LOCATION (continued)

AFT CARGO COMPARTMENT COMPONENTLOCATIONIn the aft cargo compartment the isolation valves and extract fans areinstalled in the left sidewall and near the compartment ceiling.




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COMPONENT LOCATION - AFT CARGO COMPARTMENT COMPONENT LOCATION




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MAINTENANCE/TEST FACILITIES

The two cargo heating controllers and the cargo VC are connected to theCentralized Fault Display Interface Unit (CFDIU) for test purposes andfault reporting.




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MAINTENANCE/TEST FACILITIES




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SAFETY PRECAUTIONS

When you work on aircraft, make sure that you obey all the AMMprocedures. This will prevent injury to personnel and/or damage to theaircraft. Here is an overview of the main safety procedures related to thecargo compartment heating and ventilation system.When you are in contact with harmful products, use protective clothing,rubber gloves and goggles.Do not touch a component until it is sufficiently cool to prevent burns.




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SAFETY PRECAUTIONS




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21 CARGO VENTILATION & HEATING SYS PRES.pdf

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