(7) Do this check of the wiring between the ADIRUs and the IFSAU.
(a)
Remove the left and right ADIRUs. To remove them, do this task: Air Data Inertial Reference Unit Removal, AMM TASK 34-21-01-000-801.
(b)
Remove the IFSAU. To remove it, do this task: Integrated Flight System Accessory Unit (IFSAU) Removal, AMM TASK 22-11-37-000-801.
(c)
For the left ADIRU, do a wiring check between these pins of connectors D3687B and D235A:
D3687B D235A
pinE11 ------------------pin60
(d) For the right ADIRU, do a wiring check between these pins of connectors D3693B and D235B:
D164 D235B
pinE11 ------------------pin60
(e) 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-install the left and right ADIRUs. To install them, do this task: Air Data Inertial Reference Unit Installation, AMM TASK 34-21-01-400-801. 4) If the ground crew call horn does not sound, then you corrected the fault.
(f) If you do not find a problem with the wiring, then do these steps:
1) Re-install the left and right ADIRUs. To install them, do this task: Air Data Inertial Reference Unit Installation, AMM TASK 34-21-01-400-801.
2) Install a new IFSAU. To install it, do this task: Integrated Flight System Accessory Unit Installation, AMM TASK 22-11-37-400-801.
EFFECTIVITY SIL ALL 34-21 TASK 829
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 264 Oct 15/2008
ground crew call horn does not sound, then you corrected the fault.
-------------------------END OF TASK ---------------------------
830. Minimum Maneuver Speed or Stick Shaker Speed Difference -Fault Isolation
A. Description
(1) This task is for this observed fault:
(a) Captain’s minimum maneuver speed or stick shaker speed is different from the first officer’s speed.
B. Possible Causes
(1)
Stall Management
(2)
ADIRU, M1749 (left) or M1752 (right)
(3)
AOA sensors
C. Initial Evaluation
(1)
If the stick shaker speeds are different by less than 3 knots with airspeed at or near stick shaker speed, then the cause of the fault is either crosswind or system tolerance. If the stick shaker speeds are different by less than 15 knots with airspeed at or near cruise, then the cause of the fault is either crosswind or system tolerance.
(a) No maintenance action is necessary.
(2)
If the stick shaker speeds are different by more than 3 knots with airspeed at or near stick shaker speed, or if the stick shaker speeds are different by more than 15 knots with airspeed at or near cruise, then do the fault isolation.
D. Fault Isolation Procedure
(1)
Do
this
task:
Stall
Management
Yaw
Damper
BITE
Procedure,
27-32
TASK
801.
(a)
Do the fault isolation tasks for the maintenance messages that you find. 1) If the observed fault does not occur on the next flight leg, then you corrected the fault. 2) If the observed fault occurs on the next flight leg, then continue.
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