09 Air Data Computer (ADC) Flashcards
What is the purpose of the Air Data Computer?
Air Data Computer centralises the collection of sensed data and distributes it to the required outputs
Describe the two types of Air Data Computer
Analogue:
- Inputs are collected from analogue sources which are then computed by electromechanical means and output to the different analogue outputs
Digital:
- Inputs are collected from both analogue and digital sources.
- The analogue sources are converted into digital signals using Analogue to Digital Converters (ADC’s)
- The ADC then processes the inputs and sends them to the different digital outputs
What is the advantage of Digital systems compared to Analogue systems?
Digital is less susceptible to corruption
What are the inputs for the Air Data Computer?
- Static Pressure
- Pitot Pressure
- Measured Temperature (RAT)
- Angle of Attack
- Weight on Wheels
- Configuration
- Stored Data (e.g. recovery factor)
What is the nemonic used to remember the inputs for the Air Data Computer?
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What are the outputs of the Air Data Computer?
- IAS and TAS
- OAT and TAT
- Mach Number
- Angle of Attack
- Altitude
- Vertical Speed
- Vmo and Mmo
What is the nemonic for remembering all of the outputs of the Air Data Computer?
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How many ADC’s will a small AC and a large AC typically have?
What else will an AC have if it only has one ADC?
- Small AC will typically have 1 ADC
- Large AC will typically have at least 2 ADC’s
- AC with only one ADC will have backup pressure instruments
What systems use the outputs from the ADC?
- Primary Flight Instruments
- Transponders
- Auto-pilot and Flight Director
- Flight Management System (FMS)
- Flight Data Recorder
- Warning Systems