(b)
Built-In Test Equipment (BITE) Test of the IRS
B. References
(1)
AMM 21-58-00/501, Equipment Cooling
(2)
AMM 24-22-00/201, Manual Control
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 865-088
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-089
(2)
Supply cool air to the inertial reference units (IRU) (AMM 21-58-00/501).
S 865-090
(3)
Make sure 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 DC
7) DIM AND TEST
8) INSTR XFMR-2
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737-300/400/500MAINTENANCE MANUAL
9) IRS NO. 2 AC 10) IRS NO. 2 DC 11) LANDING GEAR LTS 12) LANDING GEAR AIR/GND RELAY & LIGHTS 13) MASTER DIM BUS BAT 14) MASTER DIM BUS NO. 1 DC 15) MASTER DIM BUS NO. 2 DC 16) MASTER DIM BUS SECT 2 17) 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. 1 AC
16) IRS NO. 1 DC
17) VERT SPEED IND
E. IRS Self-Test
S 865-060
CAUTION:_______SOME SWITCHES MUST BE PULLED AND THEN TURNED. IF YOU TRY TO TURN THESE SWITCHES BEFORE YOU PULL THEM, YOU CAN DAMAGE THEM.
(1) Set the switches on the MSU to the ALIGN or NAV position.
(a) Make sure that all of the annunciators on the MSU are off.
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737-300/400/500MAINTENANCE MANUAL
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(2) Do these steps to self-test the IRS.
(a)
Set the SYS DSPL switch on the ISDU to the L position.
(b)
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 display on the ISDU 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 turns on. 2) For seconds 2-10, make sure that: a) The ALIGN, 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
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