(2)
Do the installation test of the integrated flight system accessory unit Installation (IFSAU) in this task: Integrated Flight System Accessory Unit Installation, AMM TASK 22-11-37-400-801.
(a)
If there is a fault message that relates to the IFSAU internal fault, then go to the FIM task to clear that message.
(b)
After you clear the IFSAU fault message, if the ground crew call horn does not sound, then you corrected the fault.
(c)
After you clear the IFSAU fault message, if the ground crew call horn continues to sound, then continue.
(3)
Replace the air supply low flow detector. These are the tasks: Equipment Cooling Low Flow Sensors Removal, AMM TASK 21-27-03-000-802, Equipment Cooling Low Flow Sensors Installation, AMM TASK 21-27-03-400-802.
(a)
If the ground crew call horn does not sound, then you corrected the fault.
(b)
If the ground crew call horn continues to sound, then continue.
(4)
Replace the air exhaust low flow detector. These are the tasks: Equipment Cooling Low Flow Sensors Removal, AMM TASK 21-27-03-000-802, Equipment Cooling Low Flow Sensors Installation, AMM TASK 21-27-03-400-802.
(a)
If the ground crew call horn does not sound, then you corrected the fault.
(b)
If the ground crew call horn continues to sound, then continue.
(5)
Do a check of the terminal ground block of the IRS master caution unit.
(a)
Remove the IRS master caution unit. To remove it, do this task: IRS Master Caution Unit Removal, AMM TASK 34-21-07-000-801.
(b)
Do a wiring check between these pins of connectors D2269 and GD624-DC:
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D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 262 Oct 15/2008
D2269 GD624-DC
pin4 -------------------Ground
(c) If you find a problem with the wiring, then do these steps: 1) Repair the wiring. 2) Re-install the IRS master caution unit. To install it, do this task: IRS Master Caution
Unit Installation, AMM TASK 34-21-07-400-801. 3) If the ground crew call horn does not sound, then you corrected the fault.
(d) If you do not find a problem with the wiring, then do these steps: 1) Re-install the IRS master caution unit. To install it, do this task: IRS Master Caution
Unit Installation, AMM TASK 34-21-07-400-801.
2) If the ground crew call horn continues to sound, then continue.
(6) Do this check of the wiring between the low flow detectors and the integrated flight systems accessory unit (IFSAU).
(a)
Disconnect the connector D3464 from the air supply low flow detector.
(b)
Disconnect the connector D164 from the air exhaust low flow detector.
(c)
Remove the IFSAU. To remove it, do this task: Integrated Flight System Accessory Unit (IFSAU) Removal, AMM TASK 22-11-37-000-801.
(d)
For the air supply low flow detector, do a wiring check between these pins of connectors D3464 and D235B:
D3464 D235B
pin8 -------------------pin69
EFFECTIVITY SIL ALL 34-21 TASK 829
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(e) For the air exhaust low flow detector, do a wiring check between these pins of connectors D164 and D235B:
D164 D235B
pin8 -------------------pin69
(f) If you find a problem with the wiring, then do these steps: 1) Repair the wiring. 2) Re-install the IFSAU. To install it, do this task: Integrated Flight System Accessory
Unit Installation, AMM TASK 22-11-37-400-801. 3) Re-connect the connector D3464 to the air supply low flow detector. 4) Re-connect the connector D164 to the air exhaust low flow detector. 5) If the ground crew call horn does not sound, then you corrected the fault.
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