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 NOTE:____ The applicable Airline Department will have the correct part numbers for the navigation data base and the operational program.
 (e)  Make sure the date of the navigation data base on the CDU IDENT page 1/1 is correct.
 NOTE:____ You can find the active navigation data base dates on the line under ACTIVE. The applicable Airline Department will have this data.
 (f)  Make sure the engine configuration (or engine rating) on the CDU IDENT 1/1 page agrees with the engines on the airplane.
 NOTE:____ The engine configurarion (or engine rating) shown on the CDU display is same as for the engine with the lower thrust rating.
 (g)  If the engines operate at the lower thrust rating, make sure the thrust rating is correct.
 NOTE:____ The FMC program pins are connected for different engine configurations. The CDU will show PROGRAM PIN ERROR if the pins are connected in a configuration not in the FMC.
 (h)  Push the LSK adjacent to POS INIT> to show the POS INIT 1/2 (or 1/3) page.
 NOTE:____ You can also push the CDU INIT REF key to show the POS INIT 1/2 (or 1/3) page on the display.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (i)  Make sure the Greenwich Mean Time (GMT) on each CDU agrees with the GMT on the Captain's clock.
 G. IRS Heading in Attitude Mode
 S 715-049
 (1)  
Do the preparation test in this task: "Operational Test - FMCS" if it is necessary.

 S 865-223

 (2)  
Push the INIT REF key on the CDU panel to show the POS INIT 1/2 (or 1/3) page.

 S 865-222

 (3)  
Put the mode select switches on the IRS to the ATT position.

 NOTE: You can find the mode select switches on the IRS Mode Select
____
 Unit (MSU) on the aft overhead panel (P5).

 S 865-221
 (4)  
Make sure that SET IRS HDG is shown on the POS INIT 1/2 (or 1/3) page on each CDU display.

 S 865-220

 (5)  
Use the CDU keyboard to put a heading of eleven degrees into the CDU scratch pad.

 S 285-219

 (6)  
Push LSK 5R and make sure a heading of eleven degrees is shown adjacent to LSK 5R on each CDU display.

 S 285-218

 (7)  
Put the mode select switches on the IRS to the OFF position.

 S 285-217

 (8)  
Make sure the MSU ALIGN lights go off.

 H. IRS Initialization
 S 285-057
 (1)  Align the IRS (AMM 34-28-00/201).
 I. Sensor Status
 S 715-077
 (1)  
Do the preparation test in this task: "Operational Test - FMCS" if it is necessary.

 (2)  
Align the IRS (AMM 34-28-00/201) if it is necessary.

 S 285-078
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 285-224
 (3)  Do these steps to examine the sensor status:
 (a)  
Push the INIT REF key on the CDU panel to show the POS INIT page or PERF INIT page.

 (b)  
Push the LSK adjacent to <INDEX to show the INIT REF INDEX 1/1 page.

 (c)  
Push the LSK adjacent to MAINT> to show the MAINT BITE INDEX 1/1 page.

 (d)  
Push the LSK adjacent to <FMCS to show the FMCS BITE 1/1 page.

 (e)  
Push the LSK adjacent to <SENSORS to show the FMCS SENSOR STATUS 1/1 page.

 (f)  
Make sure the outputs on the FMCS SENSOR STATUS 1/1 page are the same as the sensor outputs shown below: ~............................................................ | LRU | LEFT | RIGHT | .............................................................. | VHF NAV *[1] | OK | OK | .............................................................. | DME *[1] | OK | OK | .............................................................. | ADC | OK | OK | .............................................................. | IRS | OK | OK | .............................................................. | DFCS | OK | ___ | .............................................................. | DAA | OK | OK | .............................................................. | FUEL SUM | OK | ___ | .............................................................. | CLOCK | OK | ---| 2.............................…...............…..............1 *[1] An alternative for VHF NAV and DME outputs are NCD
　
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