(a)
If the GLS light does not show on the IRS Mode Select Unit and LOC and G/S Flags does not shown on the Captain’s and/or F/O’s Displays, then you corrected the fault
(b)
If the GLS light shows on the IRS Mode Select Unit and LOC and G/S Flags shown on the Captain’s and/or F/O’s Displays, then continue.
(2) Do the inspection of the GPS antenna connection.
(a) Check for any loose GPS cable connections between the MMR and the GPS antenna:
MMR E1-2 CONNECTOR CONNECTOR D10719A D42941P
pin2 -------------------pinA1
E1-2 GPS ANTENNA CONNECTOR CONNECTOR D42941J D2941
A1 ---------------------A1
MMR E1-4 CONNECTOR CONNECTOR D10721A D42943P
pin2 -------------------pinA1
EFFECTIVITY SIL ALL 34-31 TASK 821
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 234 Jun 15/2010
E1-4 GPS ANTENNA CONNECTOR CONNECTOR D42943J D2947
A1 ---------------------A1
(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, 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, 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, then your corrected the fault.
(i)
If the GLS light shows on the IRS Mode Select Unit, then continue.
(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, then you corrected the fault.
(b)
If the GLS light shows on the IRS Mode Select Unit, 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, then you corrected the fault.
(b)
If the GLS light shows on the IRS Mode Select Unit, 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
EFFECTIVITY SIL ALL 34-31 TASK 821
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 235 Jun 15/2010
(e) Do a continuity check between the IRS Mode Select Unit and IRS MCU: 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：737-600/700/800/900 FAULT ISOLATION MANUAL 故障隔离手册 导航(110)
