ACI 2 (Mod 1&2 - Finals) Flashcards
Systematic troubleshooting approach according to Airbus
- Identify the source of vibration
- Use onboard sensors and maintenance data for diagnosis
- Analyze vibration patterns
Corrective actions according to Airbus
- Component inspections
- Adjusting and replacing affected parts
When performing aircraft maintenance it’s important to always verify
the
OEM’s recommendation for sensor and mount installation
Who will specify when maintenance should be conducted
Manufacturer
Who issued directives that relate to engine safety
FAA
Measures acceleration forces, commonly used for engine and airframe monitoring
Accelerometers
Measures the velocity of an object or fluid using various methods
Velocimeters
2 methods/approach used in velocimeters
- Doppler effect
- Laser velocimetry
In digital vibration monitoring systems where do sensors send data
Central processing unit
Vibration levels are shown on digital displays, often integrated into the cockpit’s ____
Multi-function display
is a vibration analysis and balancing tool that rapidly and accurately acquires and analyzes aircraft and engine vibration data.
Honeywell Chadwick-Helmuth’s Vibrex™ 2000 Plus (V2K+)
are critical for monitoring and managing the levels of various fluids essential to an aircraft’s operation.
Fluid quantity system
Types of fluids monitored
- Fuel
- Oil
- Hydraulic fluid
- Water
The most critical fluid, requiring precise measurement to ensure sufficient supply for the entire flight.
Fuel
Used for engine lubrication and cooling.
Oil
Powers various aircraft systems, including landing gear, brakes, and flight controls.
Hydraulic fluid
Used in lavatory systems and potable water supply.
Water
- Used primarily for fuel measurement
- Consist of two conductive plates separated by a dielectric material (fuel).
- The capacitance changes with the fluid level, altering the electrical signal proportional to the fuel quantity.
Capacitance probes
What principle does a gyroscope use
conservation of angular momentum
- Common in oil and hydraulic systems.
- Use a float mechanism connected to a variable resistor.
- As the fluid level changes, the float moves, adjusting the resistance and changing the signal sent to the indicator.
Resistive sensors
- Use sound waves to measure fluid levels.
- Transmit ultrasonic pulses and measure the time it takes for the echoes to return.
- Suitable for various fluid types, including fuel and water.
Ultrasonic sensors
a device with a spinning disc or wheel mechanism that harnesses the principle of conservation of angular momentum
gyroscope
the tendency for the spin of a system to remain constant unless subjected to external torque.
principle of conservation of angular momentum
Instruments that is considered to be a gyro instrument
- Turn indicator
- Heading indicator
- Attitude indicator
also known as the turn and slip indicator is a variant that are essentially two aircraft flight instruments in one device.
Turn indicator
What does the turn indicator indicate
- rate of turn
- skid or slip
also known as the directional gyro, or DG displays the aircraft’s heading incompass points, and with respect to magnetic north when set with a compass.
Heading indicator
also known as anartificial horizon shows the aircraft’s relation to the horizon.
Attitude indicator
Two things that an attitude indicator is able to display
- roll
- pitch
use tiny vibrating structures to measure angular velocity.
Micro-Electro-Mechanical Systems gyroscopes
Use light traveling through optical fibers to detect rotation.
Fiber Optic Gyroscopes (FOGs)
Utilize laser beams in a ring-shaped cavity to measure rotational motion.
Ring Laser Gyroscopes (RLGs)
focuses on providing three-dimensional orientation by processing data from gyroscopes, accelerometers, and sometimes magnetometers. It gives precise attitude (pitch, roll, and yaw) and heading information to the PFD.
Attitude and Heading Reference System (AHRS)
Advantages of Digital Gyroscopic Instruments
- High precision in measuring rotational movement
- Less prone to mechanical wear and tear
- Easily integrated with other digital avionics systems
- Lower maintenance requirements compared to traditional mechanical gyroscopes
