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Avionic Common > Instruments 1 > Flashcards

Instruments 1 Flashcards

1
Q

WHAT INSTRUMENTS RESIDE WITHIN THE ‘FLIGHT T’

A

Airspeed indicator, altimeter, attitude indicator, HSI (direction indicator)

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2
Q

WHAT IS AN INSTRUMENT CLAMP MOUNT?

A

An instrument clamp mount consists of an expanding circular clamp into which a circular bodied instrument is fitted

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3
Q

WHAT IS A RACK MOUNT ELECTRICAL CONNECTION?

A

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.

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4
Q

WHICH LAW RELATES TO AMBIENT PRESSURE? AND WHAT DOES THE LAW STATE?

A

PASCALS LAW -“any pressure applied to a fluid inside a closed system will transmit that pressure equally in all directions throughout the fluid”.

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5
Q

WHAT ARE THE FOUR ELEMENTS IN WHICH INSTRUMENT MECHANISMS CAN BE BROKEN INTO?

A

Detecting, Measuring, Magnifying, indicating

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6
Q

WHAT DOES THE MAGNIFYING ELEMENT DO AND HOW DOES IT WORK?

A

The purpose of the magnifying element is to magnify the small movement of the measuring element. TURNS SMALL MOVEMENT INTO BIG MOVEMENT.

Wrong

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7
Q

WHAT SHAPE WILL THE BOURDON TUBE POSSESS WHEN UNDER HIGH PRESSURE?

A

Large cross sectional shape.

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8
Q

WHAT 3 COMPONENTS MAKE UP THE FLAP POSITION INDICATION SYSTEM

A

Flap position transmitter, flap position indicator, Flaps

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9
Q

WHAT COMPONENTS MAKE UP A FLAP POSITION TRANSMITTER?

A

Outer body, Mechanical linkage connected to control rod, DC synchronous data transmitter

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10
Q

FOR TURBINE ENGINES, HOW IS TURBINE ROTATION MEASURED/INDICATED?

A

Percent of rated RPM (Percent RPM)

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11
Q

WHAT ARE THE 2 MAIN COMPONENTS OF A MECHANICAL TACHOMETER SYSTEM?

A

A Flexible steel cable, An indicator

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12
Q

WHAT ARE THE 3 COMPONENTS OF A TACHOMETER PROBE INDICATING SYSTEM?

A

Tacho Probe, Electrical Cables, Indicator

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13
Q

WHICH OF THE 3 COMPONENTS ISNT CONNECTED TO THE ENGINE SHAFT?

A

Tacho Probe

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14
Q

WHAT IS THE PRINCIPLE IN WHICH THE PRESSURE METHOD OF SENSING TEMPERATURE OPERATES ON?

A

Liquids, When exposed to an increase in temperature, Change state from a liquid to a vapour.

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15
Q

HOW DOES AN THERMOCOUPLE GENERATE EMF

A

An emf proportional to the difference in temperature of the 2 junctions will be produced. COLD JUNCTION GENERATES EMF

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16
Q

WHAT IS THE MAX TEMPERATURE OF A CHROME/ALUMEL THERMOCOUPLE?

A

1100 degrees c

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17
Q

IN REFERENCE OF THE TRIMMING RESISTANCE SPOOL, WHAT DOES THE THERMOCOUPLE SYSTEM CONSIST OF?

A

A sensing element, Special connecting leads, A moving coil indicator

18
Q

WHAT 3 PIECES OF INFORMATION CAN YOU EXPECT TO SEE IN MAINTENANCE MANUALS IN REGARDS TO TROUBLESHOOTING AND FAULT FINDING?

A

Symptoms, Typical faults, Rectification.

19
Q

WHAT IS THE FIRST STEP IN THE PROCEDURE FOR SAFING AIRCRAFT?

A

Verify aircraft status by checking appropriate aircraft documentation. CAMM2 or EE500

20
Q

THE RAAF MANUAL OF STORAGE, MATERIALS, HANDLING AND PACKAGING STATES THAT WHO, IS RESPONSIBLE FOR UNPACKING AND PACKING TECHNICAL EQUIPMENT INTO SUITABLE REUSABLE CONTAINERS?

A

Engineering branch personnel (us)

21
Q

WHAT MAY OCCUR IF PERSONNEL FAIL TO COMPLY WITH THE INSTRUCTIONS LAID OUT BY THE AUTHORIZED MAINTENANCE DATA?

A

Personnel may be charged under the DFDA for failure to comply with a lawful general order.

22
Q

WHAT IS AN IMPORTANT STEP TO REMEMBER PRIOR TO INSTALLATION PROCEDURES?

A

Consult with your trade supe or MM regarding quality inspection requirements.

23
Q

WHAT IS THE FINAL THING YOU MUST DO BEFORE COMPLETING YOUR INSTALL PROCESS?

A

Notify the trade supe/MM of the completion of the task and any entries made in the AMD

24
Q

HOW IS AN INSTRUMENT PANEL CONSTRUCTED?

A

Light alloy of sufficient strength and rigidity to accommodate the required number of instruments

25
Q

HOW ARE THE INSTRUMENTS IN THE ENGINE INDICATING GROUP ARRANGED?

A

So that those relating to each engine correspond to engine positions on the aircraft as seen in the plane view

26
Q

WHAT ARE THE 4 CATEGORIES OF AIRCRAFT INSTRUMENTS?

A
  • Flight handling
  • Power plant performance and handling
  • Navigation
  • Miscellaneous
27
Q

HOW IS THE CONNECTOR ALIGNMENT IN A ROUND AIRCRAFT ELECTION CONNECTOR?

A

Male and female connectors incorporated with keys and keyways to ensure alignment

28
Q

TABLE TEMPERATURE FOR THE FOLLOWING:
(Material of thermocouple sensor)
- PLATINUM
- CHROME ALUMINIUM
- IRON
- COPPER

A

PLATINUM: 1400 degree c

CHROME ALUMINIUM: 1100 degree c

IRON: 850 degrees c

COPPER: 400 degrees c

29
Q

DEFINE POSITIVE AND NEGATIVE PRESSURE

A

Positive pressure: above atmospheric pressure
Negative pressure: below atmospheric pressure

30
Q

WHAT DOES ICAO STANDARDS?

A

International civil aviation organisation

  • calibration and testing of aircraft instruments
31
Q

DEFINE AMBIENT PRESSURE!

A

Pressure surrounding the aircraft

32
Q

WHAT IS THE ENGINE PRESSURE RATIO?

A
  • Ratio or turbine exhaust pressure to compressor inlet pressure
  • Indication of thrust produced by turbine engine
33
Q

WHAT IS THE SECTOR GEAR?

A

Mechanical gearing within an instrument to convert linear motion into rotary motion

34
Q

WHAT IS A TRANSDUCER / TRANSMITTER?

A

Device to convert a measurement into an elec signal

35
Q

WHAT IS THE CONSTRUCTION OF ANDROID CAPSULES AND / OR DIAPHRAGMS?

A
  • Beryllium copper
  • Phosphor bronze
  • Brass
36
Q

DIFFERENCE BETWEEN HEAT ABD TEMPERATURE?

A

Heat - energy transfer
Temperature - measure of the quality of heat

37
Q

COMPONENTS OF A WHEATSTONE BRIDGE THERMOMETER?

A
  • milli-ammter
  • resistance bulb
  • power supply
  • resistance bridge network
38
Q

WHAT SENSING ELEMENT USES LIGHT AS A METHOD FOR DETECTING TEMP?

MOST OFTEN USED FOR?

A

Radiation pyrometer
- optical lens
- fibre optic cable
- detector

Used to sense turbine blade temp

39
Q

IS THE RESISTANCE OF A WHEAT STONE BEIDGE PTC OR NTC?

A

PTC

40
Q

HOW DOES A MOVING COIL RATIO-METER OPERATE?

A
  • 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
41
Q

HOW DOES A MOVING MAGNET MAGNET RATIO-METER OPERATE?

A
  • small permanent magnet as moving element
  • position of magnet determined by strength of magnetic field produced by the coils

T - up
R - down

42
Q

WHAT PRINCIPAL DOES THE WHEATSTONE BRIDGE TEMP INDICATION CCT OPERATE ON?

A

Current through the moving coil indicator is proportional to the varying resistance of the temp sensor

IOCT

Avionic Common (7 decks)

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