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Some ULDs are line replaceable units. For these units, you
send the unit to the manufacturer to replace the battery. For
some ULDs, the battery is an LRU. The ULD is 1.3 inches (3.3
cm) in diameter and 4 inches (10.2 cm) long. It weighs less than
12 ounces (0.34 kg).
To replace the battery, grip the ULD with a gripping device such
as a split rubber hose. Do not grip the ULD with a vise because
you will damage the ULD.
Functional Description
The ULD has these operation characteristics:
* Operates when it is put into water
* Operates to a maximum depth of 20,000 feet (6096 meters)
* Has a detection range of 7,000 (2134 meters) to 12,000 feet
(3658 meters)
* Can operate under water for a minimum of 30 days
* Sends out an acoustic pulse tone of 37.5 khz at a rate of one
pulse-per-second.
FDRS - UNDERWATER LOCATING DEVICE
EFFECTIVITY
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FDRS - UNDERWATER LOCATING DEVICE
FDRS - UNDERWATER LOCATING DEVICE
EFFECTIVITY
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Purpose
The flight data acquisition unit (FDAU) collects, multiplexes and
changes inputs into a standard digital format. The inputs come
from many airplane systems and sensors. The flight data
recorder (FDR) stores the processed signals from the FDAU.
Power Requirement
The FDAU uses 115v ac, 400 Hz, single phase power.
Features
The FDAU has a data management unit (DMU). The DMU does
data monitoring. The DMU keeps ACMS data in a solid state
memory until you download the data.
The front of the FDAU has these features:
* Digital readout - gives a 7-digit display of BITE and software
data
* A PCMCIA interface - the PCMCIA stores up to 500
megabytes of data
* BITE switch - A three position toggle switch lets you see BITE
or software data
* ACMS fail light - shows an ACMS interface fault
* DFDR fail light - shows a FDR fault
* DFDAU fail light - shows a FDAU fault.
FDRS - FDAU
EFFECTIVITY
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FDRS - FDAU
FDRS - FDAU
EFFECTIVITY
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Purpose
The flight recorder/mach airspeed warning test module gives
the flight crew visual indications of the flight recorder operation.
You can manually apply power to the flight recorder at this
panel.
Features
Put the TEST/NORMAL switch in the TEST position to apply
power to the flight recorder system for maintenance purposes.
The flight recorder light comes on when the FDR or FDAU finds
a critical fault. The flight recorder light also comes on when the
FDRS is not in operation.
FDRS - FLIGHT RECORDER/MACH AIRSPEED WARNING TEST MODULE
EFFECTIVITY
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FDRS - FLIGHT RECORDER/MACH AIRSPEED WARNING TEST MODULE
FDRS - FLIGHT RECORDER/MACH AIRSPEED WARNING TEST MODULE
EFFECTIVITY
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Purpose
The three-axis accelerometer measures acceleration along the
vertical, lateral, and longitudinal axes. The accelerometer
sends acceleration data to the FDAU.
Features
The accelerometer can measure accelerations up to ten times
the normal operation range. No calibration or scheduled
maintenance is necessary.
Power
The flight recorder accelerometer gets 28v dc from the FDAU.
FDRS - ACCELEROMETER
EFFECTIVITY
SHZ ALL 31-31-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-31-00-016
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