S 865-217
(4)
Set the GND TESTS switch on the overhead maintenance panel, P461, to the ENABLE position.
S 865-218
(5)
Prepare the CDU for the test:
(a)
Push the MENU key on the CDU to show the MENU.
(b)
Push the line select key (LSK) that is adjacent to <CMC to show the CMC MENU.
(c)
If <RETURN shows after you push the LSK, push the LSK that is adjacent to <RETURN until you see the CMC MENU.
(d)
Push the LSK that is adjacent to <GROUND TESTS to show the GROUND TESTS menu.
(e)
Push the NEXT PAGE key until you find <34 INERTIAL REFERENCE.
(f)
Push the LSK that is adjacent to <34 INERTIAL REFERENCE to show the GROUND TESTS menu for the IRS.
(g)
Push the NEXT PAGE key until you find the LSK adjacent to the IRU-L, IRU-C, or IRU-R test prompt.
NOTE: If INHIBITED shows above the test prompt, the test will
____
not operate.
(h) If INHIBITED shows above the test prompt: 1) Push the LSK that is adjacent to the test prompt. 2) Do the steps shown on the CDU. 3) Push the LSK that is adjacent to <RETURN to show the ground
test menu again.
E. Inertial Reference System Ground Test
S 745-220
(1) Push the LSK that is adjacent to the applicable prompt (<IRU-L, <IRU-C, or <IRU-R).
(a)
If the TEST PRECONDITIONS page shows, make sure each instruction on the page is completed.
(b)
Push the LSK that is adjacent to START TEST>.
NOTE: IN PROGRESS shows during the test.
____
(c) When the CDU shows "DID THE 'IRS LEFT (CENTER, RIGHT) EICAS ADVISORY MESSAGE APPEAR?", push the applicable LSK for YES or NO.
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S 745-221
(2) When IN PROGRESS goes out of view, look for DONE adjacent to <IRU-L, <IRU-C, or <IRU-R.
F. Put the Airplane Back to Its Usual Condition
S 865-222
(1)
Set the GND TESTS switch to the NORM position.
S 865-223
(2)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
TASK 34-21-00-735-017
4. System Test - Inertial Reference System_______________________________________
A. General
(1)
The system test is a full test of the IRS.
(2)
These tests make up the system test:
(a)
IRS Source Select Switch Interface Test
(b)
Analog Fault Discrete and CMC Interface Test
(c)
Right CMC Interface Test
(d)
Orientation Program Pin Test
(e)
ADC Interface Test
(f)
RMI Interface Test
(g)
IRS On Battery Warning Test
(h)
Center IRU Standby Power Disconnect Test
B. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 34-21-00/201, Inertial Reference System
C. Access
(1)
Location Zones
117 Electrical and Electronics Compartment
221 Control cabin
(2)
Access Panel
117AL E/E Bay Access Door
D. Prepare for the Test
S 865-314
(1) Make sure these circuit breakers are closed:
(a) P7 Overhead Circuit Breaker Panel
1) 7A10, ADC L PWR
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2) 7A12, AOA L 3) 7A13, AOA ALTN L 4) 7A16, AOA R 5) 7A17, AOA ALTN R 6) 7C1, FMCS FMC L 7) 7C2, FMCS CDU L 8) 7C23, FMCS FMC R 9) 7C24, FMCS CDU R 10) 7F8, UPR EICAS 11) 7F9, EIU L 12) 7F10, EIU C 13) 7F11, EFIS CONT L 14) 7F14, LWR EICAS 15) 7F15, EIU R 16) 7F16, EFIS CONT R 17) 7J15, ADC C PWR 18) 7J17, ADC C P/S XFR VALVE 19) 7J19, ADC SOURCE SEL CAPT 20) 7J20, ADC SOURCE SEL F/O
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