ACI 2 (Mod 5) Flashcards
Measure air pressure to determine altitude and airspeed (e g, pitot-static systems)
Pressure sensors
Monitor temperature changes within the aircraft and its systems.
Temperature sensor
Measure airflow rates for engine performance monitoring
Flow sensor
an electric system used for transmitting information from one point to another.
Synchro system
refers to any one of a number of similarly operating two-unit electrical systems capable of measuring, transmitting, and indicating a certain parameter on the aircraft.
Synchro or synchronous
Most ___________ are designed around a synchro system, such as the flap position indicator.
position-indicating instruments
are used as remote position indicators for landing gear, autopilot systems, radar, and many other remote-indicating applications.
Synchro system
Common types of synchro system
- Autosyn
- Selsyn
- Magnesyn
What type of synchro system is used on aircrafts with direct current
DC selsyn system
The selsyn system consist of
- Transmitter
- Indicator
- Connecting wires
In the selsyn the transmitter consist of
- resistance winding
- rotatable contact arm
What type of synchro system in used on aircrafts with AC
- Autosyn
- Magnesyn
the transmitter and indicator rotors used are electro-magnets rather than permanent magnets.
Autosyn
How does autosyn system works
the indicator pointer position mirrors the transmitter rotor position.
measure the rotational speed of the aircraft’s engines.
Tachometer
Types of tachometer
- Mechanical tachometer
- Electric tachometer
Use a flexible shaft and magnetic coupling to display engine RPM.
Mechanical tachometer
Use electrical signals generated by magnetos or alternators to indicate engine speed.
Electric tachometer
is a small three phase AC generator connected via a mechanical link to engine accessory gearbox.
AC generator Tachometer
The AC generator tachometer consists of a
permanent magnet that is rotated inside stator windings wound in a three-phase star configuration.
items requiring temperature monitoring.
- Engine oil
- carburetor mixture
- inlet air
- free air
- engine cylinder heads
- heater ducts
- exhaust gas temperature
Non-Electric Temperature Indicators
- Bimettalic thermometer
- Bourdon Tube thermometer
Made of two dissimilar metals that expand at different rates. Used for free air temperature.
Bimetallic Thermometer
Uses a volatile liquid to measure temperature changes through vapor pressure
Bourdon Tube Thermometer
Electrical Temperature Measuring Systems
- Electrical Resistance Thermometer
- Ratiometer Electrical Resistance Thermometer
Utilizes a metal’s resistance change to measure temperature.
Electrical Resistance Thermometer
Measures temperature through current ratios, providing higher accuracy and stability.
Ratiometer Electrical Resistance Thermometer
Uses two unlike metals to generate an electromotive force proportional to temperature.
Thermocouple Temperature Indicators
Thermocouple Temperature Indicators APPLICATIONS
Cylinder head temperature and Exhaust gas temperature measurements
Measures exhaust and turbine inlet temperatures using multiple thermocouples.
- Exhaust gas temperature
- Turbine Inlet temperature
Combines static air temperature with ram rise due to high-speed aircraft movement.
Total Air Temperature Measurement
System design of Total air Temperature Measurement
Heated probes and sensors to prevent icing
display data from remote sensors to pilots and flight crew.
Ensure pilots have real-time information for decision-making during flight.
Indicating system
Indicating system on an airbus
- Electronic flight instrument system (EFIS)
- Electronic centralized aircraft monitoring (ECAM)
Consists of PFD and MFD
Electronic Flight Instrument System (EFIS)
Monitors and displays engine health and other critical aircraft systems.
Engine Indicating and Crew Alerting System (EICAS)
