Instruments 1 Flashcards
WHAT INSTRUMENTS RESIDE WITHIN THE ‘FLIGHT T’
Airspeed indicator, altimeter, attitude indicator, HSI (direction indicator)
WHAT IS AN INSTRUMENT CLAMP MOUNT?
An instrument clamp mount consists of an expanding circular clamp into which a circular bodied instrument is fitted
WHAT IS A RACK MOUNT ELECTRICAL CONNECTION?
Corresponding electrical fitting with the component located at the back of the mounting rack, so that when the component is fully fitted the connections will connect.
WHICH LAW RELATES TO AMBIENT PRESSURE? AND WHAT DOES THE LAW STATE?
PASCALS LAW -“any pressure applied to a fluid inside a closed system will transmit that pressure equally in all directions throughout the fluid”.
WHAT ARE THE FOUR ELEMENTS IN WHICH INSTRUMENT MECHANISMS CAN BE BROKEN INTO?
Detecting, Measuring, Magnifying, indicating
WHAT DOES THE MAGNIFYING ELEMENT DO AND HOW DOES IT WORK?
The purpose of the magnifying element is to magnify the small movement of the measuring element. TURNS SMALL MOVEMENT INTO BIG MOVEMENT.
Wrong
WHAT SHAPE WILL THE BOURDON TUBE POSSESS WHEN UNDER HIGH PRESSURE?
Large cross sectional shape.
WHAT 3 COMPONENTS MAKE UP THE FLAP POSITION INDICATION SYSTEM
Flap position transmitter, flap position indicator, Flaps
WHAT COMPONENTS MAKE UP A FLAP POSITION TRANSMITTER?
Outer body, Mechanical linkage connected to control rod, DC synchronous data transmitter
FOR TURBINE ENGINES, HOW IS TURBINE ROTATION MEASURED/INDICATED?
Percent of rated RPM (Percent RPM)
WHAT ARE THE 2 MAIN COMPONENTS OF A MECHANICAL TACHOMETER SYSTEM?
A Flexible steel cable, An indicator
WHAT ARE THE 3 COMPONENTS OF A TACHOMETER PROBE INDICATING SYSTEM?
Tacho Probe, Electrical Cables, Indicator
WHICH OF THE 3 COMPONENTS ISNT CONNECTED TO THE ENGINE SHAFT?
Tacho Probe
WHAT IS THE PRINCIPLE IN WHICH THE PRESSURE METHOD OF SENSING TEMPERATURE OPERATES ON?
Liquids, When exposed to an increase in temperature, Change state from a liquid to a vapour.
HOW DOES AN THERMOCOUPLE GENERATE EMF
An emf proportional to the difference in temperature of the 2 junctions will be produced. COLD JUNCTION GENERATES EMF
WHAT IS THE MAX TEMPERATURE OF A CHROME/ALUMEL THERMOCOUPLE?
1100 degrees c
IN REFERENCE OF THE TRIMMING RESISTANCE SPOOL, WHAT DOES THE THERMOCOUPLE SYSTEM CONSIST OF?
A sensing element, Special connecting leads, A moving coil indicator
WHAT 3 PIECES OF INFORMATION CAN YOU EXPECT TO SEE IN MAINTENANCE MANUALS IN REGARDS TO TROUBLESHOOTING AND FAULT FINDING?
Symptoms, Typical faults, Rectification.
WHAT IS THE FIRST STEP IN THE PROCEDURE FOR SAFING AIRCRAFT?
Verify aircraft status by checking appropriate aircraft documentation. CAMM2 or EE500
THE RAAF MANUAL OF STORAGE, MATERIALS, HANDLING AND PACKAGING STATES THAT WHO, IS RESPONSIBLE FOR UNPACKING AND PACKING TECHNICAL EQUIPMENT INTO SUITABLE REUSABLE CONTAINERS?
Engineering branch personnel (us)
WHAT MAY OCCUR IF PERSONNEL FAIL TO COMPLY WITH THE INSTRUCTIONS LAID OUT BY THE AUTHORIZED MAINTENANCE DATA?
Personnel may be charged under the DFDA for failure to comply with a lawful general order.
WHAT IS AN IMPORTANT STEP TO REMEMBER PRIOR TO INSTALLATION PROCEDURES?
Consult with your trade supe or MM regarding quality inspection requirements.
WHAT IS THE FINAL THING YOU MUST DO BEFORE COMPLETING YOUR INSTALL PROCESS?
Notify the trade supe/MM of the completion of the task and any entries made in the AMD
HOW IS AN INSTRUMENT PANEL CONSTRUCTED?
Light alloy of sufficient strength and rigidity to accommodate the required number of instruments
HOW ARE THE INSTRUMENTS IN THE ENGINE INDICATING GROUP ARRANGED?
So that those relating to each engine correspond to engine positions on the aircraft as seen in the plane view
WHAT ARE THE 4 CATEGORIES OF AIRCRAFT INSTRUMENTS?
- Flight handling
- Power plant performance and handling
- Navigation
- Miscellaneous
HOW IS THE CONNECTOR ALIGNMENT IN A ROUND AIRCRAFT ELECTION CONNECTOR?
Male and female connectors incorporated with keys and keyways to ensure alignment
TABLE TEMPERATURE FOR THE FOLLOWING:
(Material of thermocouple sensor)
- PLATINUM
- CHROME ALUMINIUM
- IRON
- COPPER
PLATINUM: 1400 degree c
CHROME ALUMINIUM: 1100 degree c
IRON: 850 degrees c
COPPER: 400 degrees c
DEFINE POSITIVE AND NEGATIVE PRESSURE
Positive pressure: above atmospheric pressure
Negative pressure: below atmospheric pressure
WHAT DOES ICAO STANDARDS?
International civil aviation organisation
- calibration and testing of aircraft instruments
DEFINE AMBIENT PRESSURE!
Pressure surrounding the aircraft
WHAT IS THE ENGINE PRESSURE RATIO?
- Ratio or turbine exhaust pressure to compressor inlet pressure
- Indication of thrust produced by turbine engine
WHAT IS THE SECTOR GEAR?
Mechanical gearing within an instrument to convert linear motion into rotary motion
WHAT IS A TRANSDUCER / TRANSMITTER?
Device to convert a measurement into an elec signal
WHAT IS THE CONSTRUCTION OF ANDROID CAPSULES AND / OR DIAPHRAGMS?
- Beryllium copper
- Phosphor bronze
- Brass
DIFFERENCE BETWEEN HEAT ABD TEMPERATURE?
Heat - energy transfer
Temperature - measure of the quality of heat
COMPONENTS OF A WHEATSTONE BRIDGE THERMOMETER?
- milli-ammter
- resistance bulb
- power supply
- resistance bridge network
WHAT SENSING ELEMENT USES LIGHT AS A METHOD FOR DETECTING TEMP?
MOST OFTEN USED FOR?
Radiation pyrometer
- optical lens
- fibre optic cable
- detector
Used to sense turbine blade temp
IS THE RESISTANCE OF A WHEAT STONE BEIDGE PTC OR NTC?
PTC
HOW DOES A MOVING COIL RATIO-METER OPERATE?
- 2 coils moving through a non uniform air gap in a permanent magnet
- distance varies
- coils would so current flows in opposite directions
- if power supply - no movement of coil
HOW DOES A MOVING MAGNET MAGNET RATIO-METER OPERATE?
- small permanent magnet as moving element
- position of magnet determined by strength of magnetic field produced by the coils
T - up
R - down
WHAT PRINCIPAL DOES THE WHEATSTONE BRIDGE TEMP INDICATION CCT OPERATE ON?
Current through the moving coil indicator is proportional to the varying resistance of the temp sensor
IOCT
