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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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ADIRS - TOTAL AIR TEMPERATURE PROBE
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ADIRS - TOTAL AIR TEMPERATURE PROBE
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The inertial reference function of the ADIRU supplies heading
and attitude information. The ADIRU calculates this information
with accelerometer and laser gyro sensed data.
The ADIRU has three accelerometers and three laser gyros.
The accelerometer orientation in the ADIRU is on the x, y, and z
axes of the airplane. This orientation allows the ADIRU to sense
accelerations in each of the three axes. The three laser gyros
sense pitch, roll, and yaw rotation around the x, y, and z axes.
The accelerometers and laser gyros are in a strap-down
configuration. This means that their orientation is on the x, y,
and z axes of the airplane and they move with the airplane
when it moves around or along the axes.
The IR processor in the ADIRU uses the sensor signals to
calculate IR data.
ADIRS - IR GENERAL THEORY 1
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General
The ADIRU uses three accelerometers to sense motion along
the x, y, and z axes. Each accelerometer senses acceleration
along one axis. The accelerometer can sense very large and
very small accelerations along this axis.
Each accelerometer measures acceleration along a different
axis than the other two accelerometers.
Operation
The accelerometer is a mass centered in an outer case by two
springs. When the airplane accelerates, the mass moves from
the center and makes an electrical signal through the pickoffs.
An amplifier then amplifies this signal and sends it to the
recentering coil which moves the mass back to center. The
amount of the signal necessary to keep the mass centered is
proportional to airplane acceleration.
The IR processor integrates the feedback signal with time to
calculate velocity and then integrates the calculated velocity
with time to calculate distance flown.
The IR processor then adds distance flown to the initial position
to calculate present position.
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General
Each gyro is a triangular shaped, helium-neon laser that
creates two light beams. One light beam travels in the
clockwise direction. The other light beam travels in the
counter-clockwise direction.
Laser Beam Generation
Light beam production, or lasing, occurs when a high voltage
discharge between the anodes and the cathode causes
ionization of a low pressure mixture of helium-neon gas in
the gas discharge region of the gyro. The ionized particles in
the gas discharge region begin to glow creating light. Mirrors in
each corner of the triangle reflect this light around the triangle
creating the clockwise and counter-clockwise light beams. One
of the corners of the gyro contains a partially silvered mirror
and a corner prism which lets the two light beams mix together
to form a fringe pattern on the detector.
Operation
While the gyro is stationary, the fringe pattern is also stationary
because the frequencies of both light beams are the same.
When the gyro turns around the axis perpendicular to the lasing
　
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