IRS Malfunction Codes
Figure 102 (Sheet 2)
H55245
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737-300/400/500MAINTENANCE MANUAL
40
35
REPLACE - 1 FLIGHT FLIGHTS REPLACE - 2 CONSECUTIVE
OK
30
25
20
15
10
5
0
RADIAL POS ERROR (NMI)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 TIME IN NAV MODE (HOURS)
IRU Radial Position Error
Figure 103
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737-300/400/500MAINTENANCE MANUAL
INERTIAL REFERENCE SYSTEM - MAINTENANCE PRACTICES
_________________________________________________
1. General_______
A. This procedure contains one task. That task is the alignment of the inertial reference system (IRS).
B. There are two types of alignments: regular and high latitude.
C. Regular alignment is from latitude 70.2 degrees south to latitude 70.2 degrees north. A regular alignment takes 10 minutes.
D. High latitude alignment is from latitude 70.2 degrees north to latitude
78.2 degrees north and from latitude 70.2 degrees south to latitude 78.2 degrees south. A high latitude alignment takes 17 minutes.
E. Above 78.2 degrees north latitude and below 78.2 degrees south latitude you can not accurately align the IRS.
F. You can align the IRS from any flight management computer (FMC) control display unit (CDU) or the inertial system display unit (ISDU).
G. You can not move the airplane while you align the IRS.
H. The local latitude and longitude are necessary to align the IRS.
TASK 34-28-01-822-017
2. Alignment Of The IRS____________________
A. References
(1)
AMM 21-58-02/501, EFIS Cooling System
(2)
AMM 21-58-03/501, Equipment Cooling System
(3)
AMM 24-22-00/201, Manual Control
B. Access
(1) Location Zone
101 Control Cabin - Left
102 Control Cabin - Right
C. Procedure
S 862-007
(1) Make sure that these circuit breakers are closed:
(a) P6 Load Control Center
1) DAA/FMC 2
2) DAA/FMC 2 AC
3) DAA/IRS 2 AC
4) DAA/IRS 2 DC
5) DIM AND TEST
6) EADI - R
7) EFIS CONT PNL - R
8) EFIS SYM GEN - R
9) EHSI - R
10) INSTR XFMR-2
11) IRS 1 AC
12) IRS 1 DC
13) LANDING GEAR LTS
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14) LANDING GEAR AIR/GND RELAY & LIGHTS
15) MASTER DIM BUS BAT
16) MASTER DIM BUS 1 DC
17) MASTER DIM BUS 2 DC
18) MASTER DIM BUS SECT 2
19) VERT SPEED IND
(b) P18 Load Control Panel
1) ALT SUPPLY FAN PWR
2) DAA/FMC 1 AC
3) DAA/FMC 1
4) DAA/IRS 1 AC
5) DAA/IRS 1 DC
6) EADI - L
7) EFIS CONT PNL - L
8) EFIS SYM GEN - L
9) EHSI - L
10) FMCS CDU NO. 1
11) FMCS CDU NO. 2 (if installed)
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