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ú ú 13 Page 42 ú Nov 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
ALIGNMENT CONDITIONS TABLE
ACTION RESULTS
ALIGN ANNUNCIATOR FAULT ANNUNCIATOR OPERATIONAL MODE
ELAPSED TIME < 10 MINUTES.
LATITUDE DATA ENTERED IS NOT WITHIN ONE DEGREE OF STORED VALUE OR MISCOMPARES WITH PREVIOUS ENTRY. FLASHING OFF ALIGN (DATA STORED)
SAME LATITUDE DATA ENTERED SECOND CONSECUTIVE TIME (IDENTICAL DATA). ON OFF ALIGN (DATA ACCEPTED)
ACCEPTABLE LATITUDE DATA ENTERED (WITHIN ONE DEGREE OF STORED VALUE). ON OFF ALIGN (DATA ACCEPTED)
LONGITUDE DATA ENTERED IS NOT WITHIN ONE DEGREE OF STORED VALUE OR MISCOMPARES WITH PREVIOUS ENTRY. FLASHING OFF ALIGN (DATA STORED)
SAME LONGITUDE DATA ENTERED SECOND CONSECUTIVE TIME (IDENTICAL DATA). ON OFF ALIGN (DATA ACCEPTED)
ACCEPTABLE LONGITUDE DATA ENTERED (WITHIN ONE DEGREE OF STORED VALUE). ON OFF ALIGN (DATA ACCEPTED)
EXCESSIVE MOTION DURING 10-MINUTE ALIGNMENT PERIOD. FLASHING OFF ALIGN (DATA IGNORED)
ELAPSED TIME T = 10 MINUTES.
NO LATITUDE AND/OR LONGITUDE HAS BEEN ACCEPTED OR ENTERED. FLASHING OFF ALIGN
LATITUDE DATA WITHIN ONE DEGREE, ENTERED FOR FIRST TIME, MISCOMPARES WITH COMPUTED LATITUDE. FLASHING OFF ALIGN
ACCEPTED LATITUDE DATA MISCOMPARES WITH COMPUTED LATITUDE. FLASHING OFF ALIGN
IDENTICAL LATITUDE DATA ENTERED SECOND CON-SECUTIVE TIME. O N O N ALIGN
LONGITUDE DATA INVALID, NOT WITHIN ONE DEGREE OF STORED VALUE OR MISCOMPARES WITH PREVIOUS ENTRY. FLASHING OFF ALIGN (DATA STORED)
IDENTICAL LATITUDE DATA ENTERED SECOND TIME. ON OFF ALIGN (DATA ACCEPTED)
LATITUDE AND LONGITUDE DATA HAVE BEEN ACCEPTED, NO EXCESSIVE MOTION, NO OTHER PROBLEMS PREVENT-ING ALIGNMENT, MODE SELECT SWITCH IS IN NAV POSITION. OFF OFF NAV
MODE SELECT NAV-ALIGN-NAV ZEROES OUT RESIDUAL VELOCITY ERRORS (MINIMUM OF 30 SECONDS). OFF OFF ALIGN
IRS Alignment Conditions
Figure 22
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
C. System Operation
(1) The inertial reference system (IRS) activates the ground crew call horn whenever one of the following conditions exist.
(a)
Equipment Cooling (all of the following conditions must exist): 1) Airplane on the ground 2) No cooling on the IRU's 3) IRS AC circuit breaker is closed 4) IRS is on (mode selector not in the OFF position)
(b)
IRS on DC power (all of the following conditions must exist): 1) Airplane on the ground 2) IRS AC circuit breaker open or loss of IRS AC power, and DC
circuit breaker is closed
3) IRS is on
(2)
AIRPLANES WITH HONEYWELL IRU'S; The ground crew call horn is deactivated by setting the mode selector switch to OFF on the IRS mode selector unit (MSU) on the aft overhead panel P5.
(3)
AIRPLANES WITH LITTON IRU'S; The ground crew call horn is deactivated by opening all the IRS circuit breakers.
(4)
Figure 10 shows the internals of the IRU and identifies all power, control and data bus interfaces.
(a)
The internal IRU power supply furnishes the control circuits and voltages for the IRU, MSU, and ISDU.
(b)
The power supply receives 115v, 400 Hz power and 28v dc back-up power from the airplane.
(c)
If 115 V ac is not available from the airplane, the IRU automatically switches to 28 V dc battery power. It also provides a signal to light the ON DC annunciator on the MSU. If the battery voltage drops below 18 V, the IRU will generate a DC FAIL discrete which is displayed on the MSU.
(d)
When all airplane ac power fails, the IRU automatically switches to battery power. IRU-2 stays on battery power for a maximum of 340 |40 seconds. IRU-1 stays on battery power indefinitely.
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