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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-017
Purpose
The inertial system display unit (ISDU) has an interface with the
ADIRUs. You can send digital data to the ADIRUs and show
digital information and maintenance information from the
ADIRUs.
Physical Properties
These are the properties of the ISDU:
* Height - 4.5 inches
* Width - 5.75 inches
* Depth - 5.25 inches
* Weight - 3.7 pounds
* Power - 11 watts steady state.
Features
Use the keyboard on the front panel to enter latitude, longitude,
and heading data.
The SYS DSPL switch selects left or right ADIRU data to show
on the IRS display.
The IRS display is a 13-character display that can show
numbers and the letters N, S, E, and W. The characters are
incandescent filaments. Each character is line replaceable.
The DSPL SEL switch selects the data to show from the ADIRU.
The DSPL SEL switch has these positions:
* TEST
* TK/GS (track/ground speed)
* PPOS (present position)
* WIND (wind speed/wind direction)
* HDG/STS (heading/status).
A BRT control is on the center of the DSPL SEL switch. Use the
BRT control to adjust the brightness of the ISDU display and
back lights.
ADIRS - INERTIAL SYSTEM DISPLAY UNIT
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-018
ADIRS - INERTIAL SYSTEM DISPLAY UNIT
ADIRS - INERTIAL SYSTEM DISPLAY UNIT
EFFECTIVITY
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Page 53
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-018
Purpose
The mode select unit (MSU) sends IR mode selection
instructions to the ADIRUs. It also gives visual indications of
ADIRS operation and failures.
Physical Properties
CAUTION: SOME SWITCHES MUST BE PULLED AND THEN
TURNED. IF YOU TRY TO TURN THESE SWITCHES
BEFORE YOU PULL THEM, YOU CAN DAMAGE
THE SWITCH.
The MSU has two mode selectors. One for the left ADIRU, and
one for the right ADIRU. Each mode selector has four positions.
These are the four positions:
* OFF. Causes the ADIRU not to operate
* ALIGN. Causes the ADIRU to start the alignment process
* NAV. Causes the ADIRU to enter the navigation mode after a
successful alignment
* ATT. Causes the ADIRU to enter the attitude mode.
The mode selectors have a feature to decrease the risk that the
flight crew will accidentally put the ADIRU in a mode that will
disable its operation. When the selector is in the NAV position,
the operator must pull the knob to put it in the ATT mode. When
the selector is in the ALIGN position, the operator must pull the
knob to put the selector in the OFF position. All other position
changes do not require the operator to pull the knob.
The MSU has two sets of annunciators. One set is for the left
ADIRU and one set is for the right ADIRU. Each set has these
annunciators:
* ALIGN. A white annunciator that comes on steady during
ADIRU alignment. The annunciator will flash when the
ADIRU needs information.
* ON DC. An amber annunciator that comes on steady when
the ADIRU is on the 28v dc power source.
* FAULT. An amber annunciator that comes on steady when
the IR function of the ADIRU fails.
* DC FAIL. An amber annunciator that comes on steady when
the DC power source is less than 18v dc.
An amber GPS annunciator on the MSU indicates a failure of the
global positioning system.
ADIRS - MODE SELECT UNIT
EFFECTIVITY
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D633A101-SHZ1 Feb 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-019
ADIRS - MODE SELECT UNIT
ADIRS - MODE SELECT UNIT
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-019
Purpose
The IRS master caution unit monitors the ADIRS for
unsatisfactory conditions. It controls the IRS light on the
master caution annunciator and it supplies discrete signals to
the master caution lights.
Physical Properties
The IRS master caution unit contains circuit cards. The cards do
these functions:
* Monitors ON DC, IR FAULT, and DC FAIL logic from the
　
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