C.  Access
 (1)  
Location Zones

 101/102  Flight Compartment 205 Electronic Compartment

 (2)  
Access Panel
 1201 Electronics Equipment Access Door

 D.  Prepare for the Operational Test
 S 865-066
 (1)  
Supply electrical power (AMM 24-22-00/201).

 (2)  
Supply cool air to the EFIS (AMM 21-58-02/501).

 S 865-087

 (3)  
Supply cool air to the inertial reference units (IRU's) (AMM 21-58-03/501).

 S 865-068

 (4)  
Make sure these circuit breakers are closed:

 S 865-088
 (a)  P6 Load Control Center
 1) DAA FMC 2
 2) DAA 2 DC
 3) DAA/FMC 2 AC

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 (b)

A
737-300/400/500MAINTENANCE MANUAL
 4) DAA/IRS 2 AC 5) DIM AND TEST 6) DME 2 7) EADI 8) EFIS CONT PANEL R 9) EFIS SYM GEN R 10) EHSI 11) F/O RDDMI 12) INSTR XFMR-2 13) IRS 2 AC 14) IRS 2 DC 15) LANDING GEAR LTS 16) LANDING GEAR AIR/GND RELAY & LIGHTS 17) MASTER DIM BUS BAT 18) MASTER DIM BUS NO. 1 DC 19) MASTER DIM BUS NO. 2 DC 20) MASTER DIM BUS SECT 2 21) VERT SPEED IND 22) VOR/ILS 2P18 Load Control Panel 1) CAPT RDDMI 2) CDU NO. 1 3) CDU NO. 2 4) DAA FMC 1 5) DAA 1 DC 6) DAA/FMC 1 AC 7) DAA/IRS 1 AC 8) DME 1 9) EADI 10) EFIS CONT PANEL L 11) EFIS SYM GEN L 12) EHSI 13) EQUIPMENT COOLING BLOWER ALTN AC 14) EQUIPMENT COOLING BLOWER NORMAL AC 15) EQUIPMENT COOLING CONTROL
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737-300/400/500MAINTENANCE MANUAL
 16) FMCS CMPTR
 17) INSTR XFMR - 1
 18) INSTR XFR
 19) IRS 1 AC
 20) IRS 1 DC
 21) VERT SPEED IND
 22) VOR/ILS 1

 E.  IRS Self-Test
 S 865-048
 (1)  Set the switches on the MSU to the ALIGN or NAV position.
 NOTE: The ALIGN lights will remain on until the IRUs go into the
____
 NAV mode.

 S 715-049
 (2)  Do these steps to self-test the IRS.
 (a)  
Set the IRS TRANSFER SWITCH on the P5-28 panel to the NORMAL position.

 (b)  
Set the SYS DSPL switch on the ISDU to the L position.

 (c)  
Set and hold the DSPL SEL switch on the ISDU in the TEST position.

 NOTE: Release the DSPL SEL switch from the TEST position and
____ it goes back to the TK/GS position.
 Release the switch to stop the test.
 You will possibly have to do this step again to see all effects of the test.
 1)  For seconds 0-2, make sure that: a) The ISDU display comes on. b) The ALIGN, FAULT, ON DC, and DC FAIL annunciators on
 the left side of the MSU are on. c) The IRS master caution light on the captain's side of the pilot's lightshield comes on. 2) For seconds 2-10, make sure that: a) The FAULT, ON DC, and DC FAIL annunciators on the left side of the MSU turn off. b) The IRS master caution light on the captain's side of
 the pilot's lightshield turns off. c) The display on the ISDU turns off. d) The HDG flag on the captain's EHSI comes into view.
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A 737-300/400/500MAINTENANCE MANUAL
 e) The HDG flag on the captain's RDDMI comes into view. f) The ATT flag on the captain's EADI comes into view. g) The flag on the captain's vertical speed indicator
 (VSI) comes into view. 3) For seconds 10 and on, make sure that: a) The pitch display on the captain's EADI reads 5 degrees pitch up. b) The roll display on the captain's EADI reads 45 degrees
　
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