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AIR CONDITIONING MENU Abnormal Operation(B) 1/23 AIR CONDITIONING MENU Abnormal Operation(B) 2/23 This is an example of an abnormal procedure. We will use a Trim Air System Fault to illustrate these procedures. You are in cruise and all the systems are functioning normally. You are the PNF AIR CONDITIONING MENU Abnormal Operation(B) 3/23 When the ECAM system detects a failure, the appropriate alerts are generated, and the system screen called up. AIR CONDITIONING MENU Abnormal Operation(B) 4/23 Because this is only a crew awareness, neither the Master Caution nor the Master Warning Lights illuminate. AIR CONDITIONING MENU Abnormal Operation(B) 5/23 You are the PNF and you have the task of performing the ECAM Actions. AIR CONDITIONING MENU Abnormal Operation(B) 6/23 The failure message is read “Conditioning. Trim Air System Fault” AIR CONDITIONING MENU Abnormal Operation(B) 7/23 The ECAM procedures are now followed. In the case of a Trim Air System Fault, there is no action required by the crew. AIR CONDITIONING MENU Abnormal Operation(B) 8/23 The next step in this example, after checking with the other pilot, is to clear ECAM. Clear ECAM. AIR CONDITIONING MENU Abnormal Operation(B) 9/23 The next step in this example, after checking with the other pilot, is to clear ECAM. No. Press either CLR key. AIR CONDITIONING MENU Abnormal Operation(B) 10/23 The next step in this example, after checking with the other pilot, is to clear ECAM. No. Press either CLR key. AIR CONDITIONING MENU Abnormal Operation(B) 11/23 Because this was just a crew awareness and no action was required by the crew, no STATUS page is displayed. The CRUISE page is now displayed and the CLEAR lights are out. The ECAM procedure for a trim air fault is complete. AIR CONDITIONING MENU Abnormal Operation(B) 12/23 Now, let’s look at some other Abnormal indications associated with the Air Conditioning system. AIR CONDITIONING MENU Abnormal Operation(B) 13/23 Should an ECAM or QRH procedure require the use of the RAM AIR switch it is operated by lifting the guarded flap and pushing the switch. Select the RAM AIR switch. AIR CONDITIONING MENU Abnormal Operation(B) 14/23 Should an ECAM or QRH procedure require the use of the RAM AIR switch it is operated by lifting the guarded flap and pushing the switch. No. Lift the guard and press the RAM AIR sw. AIR CONDITIONING MENU Abnormal Operation(B) 15/23 Should an ECAM or QRH procedure require the use of the RAM AIR switch it is operated by lifting the guarded flap and pushing the switch. No. Lift the guard and press the RAM AIR sw. AIR CONDITIONING MENU Abnormal Operation(B) 16/23 An ON light illuminates in the switch, the valve will open and the indication on the ECAM BLEED page will change to show this. Note that ECAM procedures normally call for the aircraft to be below FL100/Minimum En-route Altitude before operating the RAM Air valve, since the aircraft will depressurise. Let’s look at another abnormal indication. AIR CONDITIONING MENU Abnormal Operation(B) 17/23 The HOT AIR FAULT light illuminates amber when a duct overheat is detected. If this occurs the hot air pressure regulating valve and the trim air valves automatically close. AIR CONDITIONING MENU Abnormal Operation(B) 18/23 If a fault in a cabin re-circulation fan is detected the Cabin FAN indication is displayed in amber. AIR CONDITIONING MENU Abnormal Operation(B) 19/23 Zone Control Computer The Zone Control Computer, with two channels, normally operates without any indications to the pilots. However, should a fault occur there are back up modes of operation with associated indications. CHANNEL 1 CHANNEL 2 Zone Control Computer AIR CONDITIONING MENU Abnormal Operation(B) 20/23 In the first case, should a primary channel failure occur the secondary channel takes over, and optimized temperature regulation is lost. An ALTN MODE message appears and the HOT AIR and TRIM AIR valves close. CHANNEL 1 CHANNEL 2 Zone Control Computer INOP AIR CONDITIONING MENU Abnormal Operation(B) 21/23 On the STATUS page you are advised that the Cabin zone is at a fixed temperature. AIR CONDITIONING MENU Abnormal Operation(B) 22/23 In the second case if a dual channel failure occurs there is no zone temperature regulation. The packs deliver a fixed temperature and the message PACK REG appears on the ECAM COND page. Notice also that there are no indications of zone or duct temperature. CHANNEL 1 CHANNEL 2 Zone Control Computer INOP INOP AIR CONDITIONING MENU Abnormal Operation(B) 23/23 NEXT On the STATUS page you are advised that the packs are delivering air at a fixed temperature. MMoodduullee ccoommpplleetteedd AIR CONDITIONING MENU Abnormal Operation(B) 24/23 LLIISSTTOOFFSSUUBBJJEECCTTSS TTRRIIMMAAIIRRVVAALLVVEEFFAAUULLTT OOTTHHEERRFFAAIILLUURREEIINNDDIICCAATTIIOONNSS EXIT AUDIO GLOSSARY FCOM RETURN |
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