This document demonstrates a pack one overheat in-flight. The PNF is asked to read and perform the ECAM actions. The actions include turning off pack one to isolate it, verifying the overheat has cleared, then turning pack one back on once cooled. This resets the pack and clears the failure message from the displays.

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This is a demonstration of a pack one overheat in-flight.This is a demonstration of a pack one overheat in-flight.
You are the PNF. You are currently flying at your cruiseYou are the PNF. You are currently flying at your cruise
flight level, everything is normal.flight level, everything is normal.
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4. AIR CONDITIONING Abnormal Operation(A)MENUMENU 4/21

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Let’s look at the fault indications;Let’s look at the fault indications;
• A fault message and associated checklist on theA fault message and associated checklist on the
E/WD.E/WD.
• the ECAM BLEED page has been automatically calledthe ECAM BLEED page has been automatically called
to show amber indicationsto show amber indications
• a FAULT light has illuminated on the Air Conditioninga FAULT light has illuminated on the Air Conditioning
Control Panel.Control Panel.
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On the E/WD, read the title of the failure.On the E/WD, read the title of the failure.
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Before you begin, notice that the pack flow control valveBefore you begin, notice that the pack flow control valve
has closed. This occurred automatically when thehas closed. This occurred automatically when the
overheat was detected to protect the pack from damage.overheat was detected to protect the pack from damage.
The valve color indication is amber because the valveThe valve color indication is amber because the valve
position disagrees with the switch position.position disagrees with the switch position.
The compressor outlet temperature is also amber becauseThe compressor outlet temperature is also amber because
the temperature limit has been exceeded.the temperature limit has been exceeded.
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Notice also that since the pack valve has closed theNotice also that since the pack valve has closed the
supply line from the pack to the mixer unit has turnedsupply line from the pack to the mixer unit has turned
amber. This happens because there is no air flow fromamber. This happens because there is no air flow from
the pack to the mixing unit.the pack to the mixing unit.
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The PF will ask you to perform the ECAM actions.The PF will ask you to perform the ECAM actions.
You, as PNF Read and Perform the ECAM ActionsYou, as PNF Read and Perform the ECAM Actions
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The first step on ECAM directs you to turn off PACK1.The first step on ECAM directs you to turn off PACK1.
This is to match pack switch and pack valve positionThis is to match pack switch and pack valve position
and prepare to reset the pack.and prepare to reset the pack.
Note that the fault light on the Pack pushbutton switchNote that the fault light on the Pack pushbutton switch
is illuminated to help you locate it and to indicate theis illuminated to help you locate it and to indicate the
overheat condition.overheat condition.
Switch off PACK 1.Switch off PACK 1.
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The first step on ECAM directs you to turn off PACK1.The first step on ECAM directs you to turn off PACK1.
This is to match pack switch and pack valve positionThis is to match pack switch and pack valve position
and prepare to reset the pack.and prepare to reset the pack.
Note that the fault light on the Pack pushbutton switchNote that the fault light on the Pack pushbutton switch
is illuminated to help you locate it and to indicate theis illuminated to help you locate it and to indicate the
overheat condition.overheat condition.
No. Switch off PACK 1.No. Switch off PACK 1.

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The first step on ECAM directs you to turn off PACK1.The first step on ECAM directs you to turn off PACK1.
This is to match pack switch and pack valve positionThis is to match pack switch and pack valve position
and prepare to reset the pack.and prepare to reset the pack.
Note that the fault light on the Pack pushbutton switchNote that the fault light on the Pack pushbutton switch
is illuminated to help you locate it and to indicate theis illuminated to help you locate it and to indicate the
overheat condition.overheat condition.
No. To switch off Pack 1 press PACK 1 pb sw.No. To switch off Pack 1 press PACK 1 pb sw.

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When pack one is turned off, an OFF light illuminates inWhen pack one is turned off, an OFF light illuminates in
the switch and the pack valve indication turns greenthe switch and the pack valve indication turns green
showing valve /switch agreement.showing valve /switch agreement.
Notice that the FAULT light is still on.Notice that the FAULT light is still on.
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The completed procedural step disappears from the E/WD.The completed procedural step disappears from the E/WD.
Let’s move on to the next step of the procedure, which hasLet’s move on to the next step of the procedure, which has
two parts.two parts.
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The first part, a condition line, is not an action butThe first part, a condition line, is not an action but
analysis. We are to determine if the pack overheat isanalysis. We are to determine if the pack overheat is
out.out.
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The fault light in the switch is extinguished, and theThe fault light in the switch is extinguished, and the
compressor outlet temperature indication is green; socompressor outlet temperature indication is green; so
we can conclude that the overheat is out.we can conclude that the overheat is out.
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Therefore, accomplish the next ECAM action by turningTherefore, accomplish the next ECAM action by turning
Pack 1 back on.Pack 1 back on.
Switch ON PACK 1.Switch ON PACK 1.
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Therefore, accomplish the next ECAM action by turningTherefore, accomplish the next ECAM action by turning
Pack 1 back on.Pack 1 back on.
No. To switch on PACK 1 press on the PACK 1 pb sw.No. To switch on PACK 1 press on the PACK 1 pb sw.

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Therefore, accomplish the next ECAM action by turningTherefore, accomplish the next ECAM action by turning
Pack 1 back on.Pack 1 back on.
No. To switch on PACK 1 press on the PACK 1 pb sw.No. To switch on PACK 1 press on the PACK 1 pb sw.

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When the pack switch is turned back on;When the pack switch is turned back on;
• the off light is extinguished,the off light is extinguished,
• normal memos replace the failure message on thenormal memos replace the failure message on the
E/WD, because the failure condition no longer exists,E/WD, because the failure condition no longer exists,
• and the CRUISE page returns to the System Display.and the CRUISE page returns to the System Display.
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You have now completed the ECAM actions.You have now completed the ECAM actions.
The pack overheat condition has gone and the pack isThe pack overheat condition has gone and the pack is
reset.reset.
NEXTNEXT
Module completed
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LIST OFLIST OF SUBJECTS
PACK 1 OVERHEAT
EXITEXIT
GLOSSARYGLOSSARYAUDIOAUDIO FCOMFCOM
RETURNRETURN
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