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A 737-300/400/500MAINTENANCE MANUAL
DATA WORDS OUTPUT  IRU 1 OR 2 SOURCE BUS & DESTINATION 
BUS-3  BUS-1  BUS-2  BUS-1/BUS-3 
ISDU  DAA  FMC  FCC  FDAU  A/T  WX  GPWC 1  CDU  STALL  DAA  FCC  EFSG  VSI 
001 DIST TO GO 
010 PRES POS-LAT  X 
011 PRES POS-LONG  X 
012 GROUND SPEED  X  X  X 
013 TRACK ANGLE  X 
015 WIND SPEED  X 
016 WIND DIRECTION  X 
044 TRUE HEADING  X  X 
270 IRU DISCRETES  X  X  X  X  X  X 
310 PRES POS-LAT  X  X  X  X  X 
311 PRES POS-LONG  X  X  X  X  X 
312 GROUND SPEED  X  X  X  X  X  X  X  X  X  X 
314 TRUE HEADING  X  X  X 
315 WIND SPEED  X  X  X  X  X 
316 WIND DIRECTION  X  X  X  X  X 
317 TRACK ANGLE-MAG  X  X  X  X  X  X 
320 MAGNETIC HDG  X  X  X  X  X  X  X 
321 DRIFT ANGLE  X  X 
ANGLE 322 FLIGHT PATH  X  X  X 
323 FLIGHT PATH ACCEL  X  X  X  X  X 
324 PITCH ANGLE  X  X  X  X  X  X  X  X  X  X  X 
325 ROLL ANGLE  X  X  X  X  X  X  X  X  X  X 
330 BODY YAW RATE  X  X  X 
331 BODY LONG ACCEL  X  X  X  X 
332 BODY LAT ACCEL  X  X  X 
333 BODY NORM ACCEL  X  X  X  X  X 
335 TRACK ANGLE RATE  X  X 
336 PITCH ATT RATE  X  X 
337 ROLL ATT RATE  X 
360 POT VERT SPD  X  X 
361 INERTIAL ALTI-TUDE  X  X  X  X 
362 ALONG TK ACCEL  X  X 
363 CROSS TK ACCEL  X  X  X 
364 VERTICAL ACCEL  X  X  X  X 
365 INERTIAL VERT SPD  X  X  X  X  X  X  X
366 N-S VELOCITY  X 
367 E-W VELOCITY  X 

IRS PARAMETERS USED BY INTERFACES
1 IRU NO. 1 ONLY
IRS Digital Output Interface Figure 17 (Sheet 2)
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A 737-300/400/500MAINTENANCE MANUAL
Position initialization by the FMCS-CDU is accomplished by accessing the POS INIT 1/2 page on the FMCS-CDU by one of four methods:
 (a)  
Pressing the INIT/REF mode select key (when on the ground and when the IRS position has not been initialized).

 (b)  
Pressing the POS line select key when the INDEX page is displayed.

 (c)  
Pressing the POS INIT line select key when the IDENT page is displayed.

 (d)  
Pressing the PREV PAGE or NEXT PAGE key when the POS REF 2/2

 page is displayed.One of the following three methods is used to enter present position lat/long into the SET IRS POS line of the POS INIT page on the CDU.

 (a)  
LAT/LONG is entered into the scratch pad using the keyboard, then line selected into the SET IRS POS line.

 (b)  
LAT/LONG is transferred from the LAST POS line to the SET IRS POS line via the scratch pad.

 (c)  
REF AIRPORT or REF AIRPORT and GATE is entered, the resultant

 lat/long is line selected to the SET IRS POS line.Position initialization on the ISDU is done for both IRU's simultaneously. Initialization at the ISDU is done as follows:

 (a)  
Set SYS DSPL switch to either IRU (L or R).

 (b)  
Set DSPL SEL in the PPOS position.

 (c)  
Enter the present position (latitude and longitude) by pressing in proper sequence, two of the following keys; N(2), W(4), E(6), or S(8) and the input position.

 (d)
Press ENT key to transmit the data displayed to both IRU's.The alignment mode can be entered by turning the mode select switch in any of four sequences: OFF to ALIGN, OFF to ALIGN to NAV, NAV to ALIGN, or NAV to ALIGN to NAV.
　
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