(4)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 865-063
S 865-064
S 865-065
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
TASK 34-28-01-715-069
4. IRS Self-Test
_____________
NOTE: This is a scheduled maintenance task.
____
A. References
(1)
AMM 21-58-02/501, EFIS Cooling System
(2)
AMM 21-58-03/501, Equipment Cooling System
(3)
AMM 24-22-00/201, Manual Control
B. Access
(1) Location Zones
101/102 Flight Compartment
C. Prepare for the Test
S 865-070
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-092
(2)
Supply cool air to the EFIS (AMM 21-58-02/501).
S 865-071
(3)
Supply cool air to the inertial reference units (IRU's) (AMM 21-58-03/501).
S 865-072
(4)
Make sure these circuit breakers are closed:
(a)
P18 Load Control Center
1) IRS NO. 1 AC
2) IRS NO. 1 DC
(b)
P6 Load Control Panel
1) IRS NO. 2 AC
2) IRS NO. 2 DC
S 865-098
(5)
Set the IRS TRANSFER SWITCH on the P5-28 panel to the NORMAL position.
(6)
Set the switches on the MSU to the ALIGN or NAV position.
S 865-073
NOTE: The ALIGN lights will remain on until the IRUs go into the
____
NAV mode.
D. Procedure
S 865-074
(1) Set the SYS DSPL switch on the ISDU to the L position.
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A
737-300/400/500MAINTENANCE MANUAL
S 865-075
(2) Set and hold the DSPL SEL switch on the ISDU in the TEST position.
NOTE: You must hold the DSPL SEL switch in the TEST position or
____ it will return to the TK/GS position and the test will stop. Run the test again if you do not see all the results of the test.
(a)
For seconds 0-2, make sure these indications occur: 1) All the segment and punctuation indicators on the ISDU come on. 2) The ALIGN, FAULT, ON DC, and DC FAIL annunciators on the left side of the MSU come on.
3) The IRS annunciator light on the captain's side of the pilots' lightshield comes on.
(b)
For seconds 2-10, make sure the indications occur: 1) The FAULT, ON DC, and DC FAIL annunciators on the left side of the MSU go off. 2) The IRS annunciator light on the captain's side of the pilots' lightshield goes off.
3) All the segment and punctuation indicators on the ISDU go off.
(c)
Release the DSPL SEL switch on the ISDU.
(d)
Set the SYS DSPL switch on the ISDU to the R position.
(e)
Set and hold the DSPL SEL switch on the ISDU in the TEST position. 1) For seconds 0-2, make sure that these indications occur:
a) All the segment and punctuation indicators on the ISDU come on. b) The ALIGN, FAULT, ON DC, and DC FAIL annunciators on the right side of the MSU come on. c) The IRS annunciator light on the captain's side of the pilots' lightshield comes on. 2) For seconds 2-10, make sure that these indications occur: a) The FAULT, ON DC, and DC FAIL annunciators on the right side of the MSU go off. b) The IRS annunciator light on the captain's side of the pilots' lightshield goes off.
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