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43 Cards in this Set
- Front
- Back
What is multiplexing? |
Process of transmitting information from several sources through one system with different signals staggered in time to form a composite pulse train |
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What is the biggest advantage of multiplexing? |
Saving time and weight of avionics units |
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What are the four elements of the MIL-STD 1553B data bus system? |
Bus controller, remote terminal, bus monitor, data bus |
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What may sophisticated bus controller do in the event of data bus failures that may jeopardize the aircraft mission or imperil aircraft safety? |
Alert the aircraft's pilot |
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What is a protocol error? |
When incoming command and data are electrically correct but the message is illegal by protocol |
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What factors affect MIL-STD 1553B data bus system reliability and signal quality? |
Length of main data bus, position/length of stubs, number terminals connected to data bus |
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When are transformer-coupled stubs used in MIL-STD 1553B the data bus? |
Stub lengths over 20 feet |
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What are the types of words used on the MIL-STD 1553B data bus? |
Command, status, data |
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What is a command word? |
Directs a remote terminal to transmit or receive information across the data bus |
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What is a status word? |
Provides information on status of the remote terminal |
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What is a data word? |
Contains information to be transferred from one avionics unit to another |
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What is the speed of the fiber optic data bus in its basic figuration? |
50 Mbps |
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What do some fiber-optic data buses use to gain high-speed message transfer capability? |
MIL-STD 1553B controlling protocol |
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What type of bus allows for faster transmission of data than traditional data buses? |
Ethernet |
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What type of protocol does ethernet use? |
Carrier sense, multiple access, collision detect (CSMACD) |
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Where most data flow through when it is sent between two processors? |
Through a digital switching module |
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What is the function of the SGU? |
Processing, analog-to-digital conversion, and symbology generation |
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What component provides the electro-optical interface for the symbology to the pilot and copilot night vision goggles? |
VSDU |
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What is the purpose of the optical combiner assembly? |
Transfers image generated by VSDU and mixes it with the forward operating view of NVG's |
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What is the purpose of the pitch correction switch on the VSDS control unit? |
I was artificial Verizon up or down to center on HUD and HDD field of view |
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What does the VSDS display? |
Navigation data, airspeed, altitude, attitude, and various cautions |
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How is inertial navigation data provided to the SGU? |
Via MIL-STD 1553B data bus |
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What do mission computers manage? |
Overall control of aircraft systems and displays |
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What contains the fault isolation procedures for controlling the mission computer in aircraft equipment during maintenance activities? |
OMP software |
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What will cause a digital video reformatter to remain at its last setting? |
Failure of TMIT or central processor |
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Why is the TMIT classified as an intelligent terminal? |
It contains it's own central processing controls and memory |
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What systems interface with the FSAS in order to provide in-flight advisories to minimize fuel consumption? |
FMAC |
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What fuel indications does the FSAS provide the aircrew? |
Fuel quantity, fuel transferred, fuel transfer rate, low pressure warning, and low quantity warning |
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How is advisory data transmitted? |
Over MIL-STD 1553B data bus from FMAC to CDU |
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What displays the optimum thrust settings and indicated airspeed? |
MFDs |
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How are the FMAC and CDUs connected to the FSB? |
Bus couplers |
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Why is ADC output data provided to the FMAC? |
For airspeed calculations |
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What happens when the IDS detects a fault that is classified as a caution or warning? |
Associated light is illuminated |
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Where are the IDS fault codes recorded? |
personal computer memory card international Association (PCMCIA) Removable memory modules (RMM) |
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What happens after the mission computer determines the BIT status of all LRUs connected to the MIL-STD 1553B data bus? |
BIT status of LRU is monitored |
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Where is recorded IDS diagnostic data downloaded for analysis? |
MMS |
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What is static pressure? |
Weight of air above and area |
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What is the standard datum plane? |
Theoretical playing or atmospheric pressure is 29.92 in/hg and temperature is +15°C |
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What type of pressure enters the pitot opening? |
Impact |
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What type of pressure enters the static pressure holes? |
Atmospheric |
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When using a static source in an unpressurized part of the aircraft why is there a small error in the readings? |
Pressure of the alternate source is lower than atmospheric pressure |
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What are the three basic pitot-static instruments? |
Airspeed, vertical velocity, and altitude |
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