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ADIRUs
* Monitors GPS status
* Controls the IRS light on the master caution annunciator.
ADIRS - IRS MASTER CAUTION UNIT
EFFECTIVITY
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ADIRS - IRS MASTER CAUTION UNIT
ADIRS - IRS MASTER CAUTION UNIT
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-020
General
The ADIRS has four air data modules (ADMs). One ADM is for
each of these components:
* Captain’s pitot probe
* Captain’s static port
* First officer’s pitot probe
* First officer’s static port.
Purpose
The ADM measures air pressure and changes the measured
value to ARINC 429 data. The ADM transmits the data to the
ADIRU.
Physical Properties
The ADM has these dimensions:
* Height - 2.5 in (6.35 cm)
* Width - 3 in (7.62 cm)
* Length - 6 in (15.24 cm).
The ADM mounts to the airframe with the two flanges on the
sides of the unit. The ADM weighs less than 2 pounds. It does
not need to be cooled. The ADMs are interchangeable.
ADIRS - AIR DATA MODULE
EFFECTIVITY
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ADIRS - AIR DATA MODULE
ADIRS - AIR DATA MODULE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-021
General
The angle of attack (AOA) sensor measures the direction of
airflow relative to the fuselage.
Physical Properties
These are the physical properties of the AOA sensor:
* Length - 7.5 inches (19 cm)
* Diameter - 3.2 inches (8.1 cm)
* Weight - 2.5 pounds (1.1 kg).
Resolvers
There are two resolvers in each AOA sensor.
The AOA data from the two resolvers in the left AOA sensor go
to the left ADIRU and to the stall management yaw damper
(SMYD) 1. The AOA data from the two resolvers in the right AOA
sensor goes to the right ADIRU and to the SMYD 2.
Electrical Connector
The angle of attack sensor has two electrical connectors. One
connector receives heater power and supplies resolver 1 data
to the SMYD. The other connector supplies resolver 2 data to
the ADIRU.
Installation
You install the AOA sensor from the outside of the airplane.
Training Information Point
There are two alignment pins on the AOA sensor. Make sure
the pins fit in their holes when you install the AOA sensor.
ADIRS - ANGLE OF ATTACK SENSOR
EFFECTIVITY
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34-21-00-022
ADIRS - ANGLE OF ATTACK SENSOR
ADIRS - ANGLE OF ATTACK SENSOR
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-21-00-022
General
The total air temperature (TAT) probe measures the air
temperature outside the airplane. An opening in the front of
the sensor lets air flow through and around the sensing
elements and exit through ports in the rear of the probe.
Sensing Elements
There are two sense elements in the TAT probe. Each sense
element is a resistive element. The value of resistance changes
when the temperature of the air flow across the element
changes.
Electrical Connector
The analog connection to the ADIRUs and to the heater power
connection comes through the electrical connector. The heater
in the TAT probe prevents ice.
ADIRS - TOTAL AIR TEMPERATURE PROBE
EFFECTIVITY
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34-21-00-023
ADIRS - TOTAL AIR TEMPERATURE PROBE
ADIRS - TOTAL AIR TEMPERATURE PROBE
EFFECTIVITY
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