(b)
If the cable connection is loose, repair the wiring.
(c)
If the flags do not show on the Captain’s and/or F/O’s Displays and GLS light does not show on the IRS Mode Select Unit when the RECALL annunciator on the IRS Master Caution Unit is pushed, then you corrected the fault.
(d)
If the flags show on the Captain’s and/or F/O’s Displays and GLS light still shows on the IRS Mode Select Unit when the RECALL annunciator on the IRS Master Caution Unit is pushed, then continue.
(e)
Do this task: AMM TASK 25-21-45-000-801.
(f)
Inspect the GPS antenna connector (M2102), D2947 or (M2103), D2941 for water contamination and repair if necessary.
(g)
Do this task: AMM TASK 25-21-45-400-801.
(h)
If the GLS light does not show on the IRS Mode Select Unit when the RECALL annunciator on the IRS Master Caution Unit is pushed, then your corrected the fault.
(i)
If the GLS light shows on the IRS Mode Select Unit when the RECALL annunciator on the IRS Master Caution Unit is pushed, then continue.
EFFECTIVITY SIL ALL 34-31 TASK 822
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 237 Jun 15/2010
(3)
Replace the IRS Mode Select Unit, P5-69 These are the tasks: AMM TASK 34-21-03-000-801, AMM TASK 34-21-03-400-801.
(a)
If the GLS light does not show on the IRS Mode Select Unit when the RECALL annunciator on the IRS Master Caution Unit is pushed, then you corrected the fault.
(b)
If the GLS light shows on the IRS Mode Select Unit when the RECALL annunciator on the IRS Master Caution Unit is pushed, then continue.
(4)
Replace the IRS Master Caution Unit, M1206, on the P61 sidewall panel. These are the tasks: AMM TASK 34-21-07-000-801, AMM TASK 34-21-07-400-801.
(a)
If the GLS light does not show on the IRS Mode Select Unit when the RECALL annunciator on the IRS Master Caution Unit is pushed, then you corrected the fault.
(b)
If the GLS light shows on the IRS Mode Select Unit when the RECALL annunciator on the IRS Master Caution Unit is pushed, then continue.
(5)
Do this check of the wiring:
(a)
Remove the IRS Mode Select Unit. To remove it, do this task: AMM TASK 34-21-03-000-801.
(b)
Remove the MMR. To remove it, do this task: AMM TASK 34-31-42-000-801.
(c)
Remove the IRS MCU. To remove it, do this task: AMM TASK 34-21-07-000-801.
(d)
Do a continuity check between the MMR and the IRS MCU:
IRS MCU MMR CONNECTOR CONNECTOR D2269 D10719B
pin7 -------------------pinG1 pin10 -------------------pinH1
D2271 D10721B
pin7 -------------------pinG1 pin10 -------------------pinH1
(e) Do a continuity check between the IRS Mode Select Unit and IRS MCU:
EFFECTIVITY SIL ALL 34-31 TASK 822
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 238 Jun 15/2010
IRS MSU IRS MCU CONNECTOR CONNECTOR D2173 D2271
pin24 -------------------pin8
(f) If there is not continuity, then do these steps: 1) Repair the wiring. 2) Re-install the IRS Mode Select Unit. To install it, do this task: AMM
TASK 34-21-03-400-801. 3) Re-install the MMR. To install it, do this task: AMM TASK 34-31-42-400-801. 4) Re-install the IRS MCU. To install it, do this task: AMM TASK 34-21-07-400-801. 5) If the GLS light does not show on the IRS Mode Select Unit when the RECALL
annunciator on the IRS Master Caution Unit is pushed, then you corrected the fault.
-------------------------END OF TASK ---------------------------
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