C.  Procedure
 S 862-007
 (1)  Make sure that these circuit breakers are closed:
 (a)  P6 Load Control Center 1) ADI 2) CAPT ADI (ALTN) 3) CAPT COMPASS XFMR (ALTN) AC 4) DAA NO. 2 FMC 5) DAA NO. 2 FMC AC 6) DAA NO. 2 IRS AC 7) DAA NO. 2 IRS DC 8) DIM AND TEST 9) INSTR XFMR-2 10) IRS NO. 1 AC 11) IRS NO. 1 DC 12) LANDING GEAR LTS 13) LANDING GEAR AIR/GND RELAY & LIGHTS 14) MASTER DIM BUS BAT
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737-300/400/500MAINTENANCE MANUAL
 15) MASTER DIM BUS NO. 1 DC
 16) MASTER DIM BUS NO. 2 DC
 17) MASTER DIM BUS SECT 2
 18) VERT SPEED IND

 (b)  P18 Load Control Panel
 1) ADI
 2) DAA NO. 1 FMC
 3) DAA NO. 1 FMC AC
 4) DAA NO. 1 IRS AC
 5) DAA NO. 1 IRS DC
 6) EQUIPMENT COOLING BLOWER ALTN AC
 7) EQUIPMENT COOLING BLOWER NORMAL AC
 8) EQUIPMENT COOLING CONTROL
 9) FMC CDU - 1
 10) FMC CDU - 2
 11) FMC COMPUTER
 12) F/O ADI (ALTN)
 13) F/O COMPASS XFMR (ALTN) AC
 14) INSTR XFMR - 1
 15) IRS NO. 2 AC
 16) IRS NO. 2 DC
 17) VERT SPEED IND

 S 862-008
 (2)  
Supply the electrical power (AMM 24-22-00/201).

 S 862-013

 (3)  
Supply cool air to the inertial reference units (IRU) (AMM 21-58-00/501).

 S 822-009

 (4)  
Do these steps to align the IRS from a CDU.

 CAUTION:_______SOME SWITCHES MUST BE PULLED AND THEN TURNED. IF YOU TRY TO TURN THESE SWITCHES BEFORE YOU PULL THEM, YOU CAN DAMAGE THEM.
 (a)  To do a high latitude alignment, set the switches on the IRS mode select unit (MSU) to the ALIGN position from the OFF position.
 NOTE: You can find the MSU on the P5 overhead panel.
____ A high latitude alignment takes 17 minutes. Note the present time for later use in this procedure.
 1)  Make sure that the ON DC lights on the MSU come on for a short time.
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A 737-300/400/500MAINTENANCE MANUAL
 2) Make sure that the ALIGN lights on the MSU come on.
 (b)  To do a regular alignment,
 set the switches on the IRS mode select unit (MSU) to the NAV
 position from the OFF position.
 NOTE: You can find the MSU on the P5 overhead panel.____
 A regular alignment takes 10 minutes.
 1) Make sure that the ON DC lights on the MSU come on for a
 short time.
 2) Make sure that the ALIGN lights on the MSU come on.
 (c)  Push the INIT REF key on the CDU.
 (d)  Push the line select key adjacent to the <INDEX prompt.
 1) Make sure that the CDU shows the INIT/REF INDEX page.
 (e)  Push the line select key adjacent to the <POS prompt.
 1) Make sure that the CDU shows the first POS INIT page.
 (f)  Put the latitude and the longitude into the scratch pad line of
 the CDU.
 (g)  Push the line select key adjacent to SET IRS POS.
 1) Make sure that the CDU shows the latitude and the longitude
 below SET IRS POS.
 (h)  If you did a regular alignment,
 make sure that the ALIGN lights on the MSU turn off.
 NOTE: The IRS is now aligned and in the navigation mode.____

 CAUTION:_______SOME SWITCHES MUST BE PULLED AND THEN TURNED. IF YOU TRY TO TURN THESE SWITCHES BEFORE YOU PULL THEM, YOU CAN DAMAGE THEM.
 (i)  If you did a high latitude alignment, after 17 minutes, set the switches on the MSU to the NAV position from the ALIGN position. 1) Make sure that the ALIGN lights on the MSU turn off.
 NOTE: The IRS is now aligned and in the navigation mode.
　
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