-read the related ground speed on the ADIRS CDU display.
NOTE : You can also read the ground speed on the CAPT ND (IR1) and
____ F/O ND (IR2). To read the residual ground speed for IR3 on the CAPT (F/O) ND, set the ATT HDG selector switch on the SWITCHING panel (8VU) to CAPT/3 (F/O/3). But, because of DMC processing, the ground speed value shown on the ND can be different from the value on the ADIRS CDU by 1 Kt.
(2) Compare the recorded ground speed values with these limits:
(a) If the residual ground speed error is less than 15 Kts:
-the ADIRU is serviceable and no action is necessary.
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(b)
If the residual ground speed error is equal to 15 Kts or is between 15 and 21 Kts:
-it is not necessary to replace the ADIRU but you must do a second check of the residual ground speed error immediately after the subsequent flight. If the value is again equal to 15 Kts or is between 15 and 21 Kts, replace the ADIRU (Ref. TASK 34-12-34-000-001) and (Ref. TASK 34-12-34-400-001);
(c)
If the residual ground speed error is equal to or more than 21 Kts:
-replace the ADIRU (Ref. TASK 34-12-34-000-001) and (Ref. TASK 34-12-34-400-001).
5. Close-up
________
Subtask 34-12-34-860-053
A. Put the aircraft back to its initial configuration.
(1)
Do the ADIRS stop procedure (Ref. TASK 34-10-00-860-005).
(2)
Do the EIS stop procedure (Ref. TASK 31-60-00-860-002).
(3)
De-energize the aircraft electrical circuits
(Ref. TASK 24-41-00-862-002).
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MOUNT - ADIRU - REMOVAL/INSTALLATION
____________________________________ TASK 34-12-51-000-001 Removal of the ADIRU Mount
1.
Reason for the Job
__________________
Self Explanatory
2.
Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking caps
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
08-22-00-200-001 Precise Leveling 34-12-34-000-001 Removal of the ADIRU (1FP1, 1FP2, 1FP3) 34-12-51-991-001 Fig. 401
3. Job Set-up
__________ Subtask 34-12-51-210-050
A. Do the aircraft precise leveling (Ref. TASK 08-22-00-200-001) to put the aircraft in position to have a 0 degree pitch, 0 degree roll. Use the standard reference marks of the aircraft (tolerance +/- 5 minutes).
NOTE : You must keep the aircraft in this position during the removal and
____
installation procedures.
Subtask 34-12-51-020-050
B. Remove the ADIRUs 1FP1, 1FP2 and 1FP3 (Ref. TASK 34-12-34-000-001).
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4. Procedure
_________ Subtask 34-12-51-020-051
A. Removal of the ADIRU Mount
(Ref. Fig. 401/TASK 34-12-51-991-001)
(1)
Remove the nuts (4), the washers (8) and the screws (7) which attach the bonding leads (5) to the mount (13).
(2)
Remove the nuts (14) from the screws (11).
(3)
Remove the electrical connectors (12) from the mount (13). Use some straps to attach the electrical connectors (12).
(4)
Put blanking caps on the disconnected electrical connectors.
(5)
Remove the nuts (1), the washers (2) and the screws (6).
(6)
Lift the mount (13) off its support. Be careful not to cause damage to the peel shims (3) and the air conditioning pipe (9).
(7)
Put marks on the peel shims (3) with a felt-tip pen or equivalent, to make sure that you put them back in their initial positions when you install the mount (13).
(8)
Remove the nuts (10).
(9)
Remove the air conditioning pipe (9).
(10) Remove the mount (13).
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ADIRU Mount
Figure 401/TASK 34-12-51-991-001
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