Electrical and Electronic Fundamentals
Not publishedof exam
DC circuitsAC circuitsComponentsSemiconductorsDigital logic
Maintenance Practices and Measurement
Not publishedof exam
SafetyESDToolsTest equipmentTechnical data
Aircraft Wiring and Fundamentals
Not publishedof exam
WiringConnectorsAircraft axesFlight controlsGround handling
Quick Facts
- Credential
- Aircraft Electronics Technician
- Administrator
- SpaceTEC Partners
- Questions
- 90
- Passing score
- 73%
- Time limit
- Not published
- Content weights
- Not published
- Eligibility
- Open to all
- Renewal
- Five years
AC Phase Memory
ELI: voltage leads; ICE: current leads
InductorCapacitor
Series vs Parallel
Series
- One current path
- Current stays equal
Parallel
- Multiple current paths
- Voltage stays equal
Trace paths before choosing formula
DC Circuit Laws
- Ohm law
- E equals I times RCore
- Power
- P equals E times I
- Series current
- Same through every component
- Parallel voltage
- Same across every branch
- Series resistance
- Add individual resistance values
- Parallel resistance
- Total is branch-lower
- KVL
- Loop voltage sum equals zero
Power Recall
Power equals volts times amps
P equals EIWatts
AC vs DC
DC
- One polarity direction
- Steady circuit analysis
AC
- Direction periodically reverses
- Phase may matter
Identify waveform and measurement needed
AC Circuit Essentials
- Frequency
- Cycles per secondHz
- RMS voltage
- Effective sine-wave value
- Inductive reactance
- Rises with frequency
- Capacitive reactance
- Falls with frequency
- Inductor phase
- Voltage leads currentELI
- Capacitor phase
- Current leads voltageICE
- Resonance
- Inductive equals capacitive reactance
Passive Components
- Resistor
- Limits current flowR
- Capacitor
- Stores electric field energyC
- Inductor
- Stores magnetic field energyL
- Transformer
- Transfers AC magnetic energy
- Fuse
- Opens during excessive current
- Circuit breaker
- Resettable overcurrent protection
- Relay
- Electrically controlled switch
Active Devices and Logic
- Diode
- Conducts primarily one direction
- Transistor
- Controls current or switches
- Rectifier
- Converts AC toward DC
- AND gate
- All inputs trueLogic
- OR gate
- Any input trueLogic
- NOT gate
- Inverts input stateLogic
- Hexadecimal
- Base sixteen number system
Safe Test Order
Data, safe, measure, repair, verify
Approved dataVerification
Voltage vs Current Test
Voltage
- Measure across points
- Circuit usually energized
Current
- Measure through path
- Meter goes series
Never use current range across source
Circuit Fault Check
- Before touching circuit→Read current approved data(Confirm configuration)
- Hazard exists→Make system safe(Use required controls)
- Power is required→Select correct meter function(Protect meter)
- Supply is absent→Check source and protection(Do not bypass)
- Supply is present→Trace toward failed load(Use diagrams)
- Path is suspect→De-energize for resistance(Avoid live ohms)
- Fault is found→Repair per approved data(Use proper materials)
- Repair is complete→Functionally verify system(Record required work)
Safe Maintenance Practice
- Approved data
- Use current authorized instructionsAlways
- ESD control
- Protect static-sensitive devices
- FOD control
- Account for tools and debris
- Lockout
- Control hazardous energy
- PPE
- Match equipment to hazard
- Hazardous material
- Follow handling requirements
- Work area
- Keep clean and organized
Continuity vs Resistance
Continuity
- Checks conductive path
- Often audible indication
Resistance
- Measures opposition value
- Requires de-energized circuit
Remove power before either test
Measurement and Troubleshooting
- Meter range
- Start safely when uncertain
- Continuity
- Tests intended conductive path
- Voltage test
- Measure across two points
- Current test
- Place meter in series
- Resistance test
- De-energize before measuring
- Signal tracing
- Follow input through output
- Fault isolation
- Verify before replacing parts
Flight Axes
Pitch, roll, yaw: three rotations
LateralLongitudinal
Bonding vs Shielding
Bonding
- Creates electrical path
- Controls potential differences
Shielding
- Limits noise coupling
- Protects signal integrity
Use approved wiring data
Wiring Defect Response
- Damage is observed→Stop and assess(Prevent further damage)
- Data identifies limits→Apply approved repair(Follow exact method)
- Chafing is present→Correct routing and protection(Remove root cause)
- Terminal is suspect→Inspect crimp and retention(Use approved tools)
- Connector is opened→Inspect pins and keying(Prevent mis-mating)
- Shield is disturbed→Restore continuity correctly(Follow data)
- Repair is finished→Inspect before energizing(Look for FOD)
- System is restored→Test and document(Close maintenance record)
Aircraft Wiring Practice
- Wire gauge
- Higher AWG means smaller
- Crimp
- Use approved tooling
- Strain relief
- Prevent terminal loading
- Bonding
- Provides low-resistance path
- Shielding
- Reduces electromagnetic interference
- Connector keying
- Prevents wrong mating
- Wire routing
- Avoid heat and chafing
Aircraft Fundamentals
- Pitch
- Rotation about lateral axis
- Roll
- Rotation about longitudinal axis
- Yaw
- Rotation about vertical axis
- Ailerons
- Primary roll control
- Elevator
- Primary pitch control
- Rudder
- Primary yaw control
- Ground handling
- Follow aircraft-specific procedures
Common Traps
Live Resistance Test
Ohms needs de-energized circuit ≠ Protect meter and equipment
Unapproved Repair Data
Generic advice is insufficient ≠ Use current authorized instructions
Wrong Meter Jacks
Confirm lead positions ≠ Check function before contact
Bypassing Protection
Never defeat protective devices ≠ Find the underlying fault
Ignoring Chafing Cause
Repair damage and routing ≠ Prevent repeated contact
Assuming Published Weights
ASTM publishes no percentages ≠ Review all guide areas
Last Minute
- 1.Recall Ohm law relationships
- 2.Separate series from parallel
- 3.Use ELI and ICE
- 4.Identify passive component functions
- 5.Recognize basic logic gates
- 6.De-energize before resistance tests
- 7.Check meter leads and range
- 8.Use current approved maintenance data
- 9.Protect ESD-sensitive components
- 10.Inspect routing for chafing
- 11.Match controls with axes
- 12.Verify repair and documentation
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