day 6
TRANSCRIPT
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Avionics Systems Day 6
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Transponder
Used to help ATC identify aircraft operating in controlled airspace
Transponders operate in the same frequency range as ATC radar
Required to be inspected & tested every 24 calendar months
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The control head of an ATC transponder
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Transponder
When ATC radar interrogates the aircraft, the transponder automatically responds by sending a four digit identification code
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Transponder
The four digit code is registered in the ATC computer along with the aircraft flight plan The controller will see the aircraft
registration number and four digit code on the radar screen
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Transponder Functions
Identification (ident) – simply the four digit coded reply
Altitude reporting – transponder is coupled to an encoding altimeter which sends the aircraft altitude with the reply
Collision avoidance – monitors other aircraft transponders in the area & will determine if a collision is possible
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Transponder Operation
Transponders operate in three modes Mode A
Identification only Mode C
Identification & Altitude reporting (required in some airspace)
Mode S Identification, Altitude reporting, & collision
avoidance
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TCAS
Traffic alerting & Collision Avoidance System Used with mode S transponders Works independently of ground stations If a collision course is detected the system
will display appropriate directions to the pilot to prevent the collision
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ELT
Emergency Locator Transmitter Battery powered transmitter required on
all general aviation aircraft Produces a locator signal which can be
used by search & rescue to locate downed aircraft
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ELT
Inertia switch activated 6 G forward Also has a manual switch on the ELT, &
usually in the cockpit Frequencies
121.5 & 243 MHz International distress frequencies
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ELT
100 Mile range at 10,000 ft 48 Hour capacity Installed in the tail of the aircraft
Provides protection from crash damage when placed as far aft as possible
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ELT
Must be tested on a regular basis Every 12 calendar months
The test must be performed within the first 5 minutes of any hour Log book entry should be made after test
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ELT Testing
Tune radio to 121.5 With the ELT disconnected from the
antenna turn on the ELT using the switch You should hear the siren
Turn switch to arm position & shake You should hear the siren again
Turn off ELT using the switch Do not let the ELT operate for more than 3
seconds at a time
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ELT Battery Check
Battery must be replaced at the time of the expiration date found on the battery case
Or if more than one hour has been depleted from the battery Check maintenance records in the aircraft
logbooks
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EPIRB
Emergency & Position Indicating Radio Beacon
New replacement for the ELT Will be required by Feb. 2009 5 Watts of power not ½ watt Digital signal
Identifies owner and aircraft Fewer false alarms Must be registered with the FAA
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EPIRB
Picked up by satellites Can be interfaced with aircraft GPS
Pinpoint accuracy .031 kilometers Old ELT 1260 sq kilometers
More rapid response time for rescuers
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FDR
Flight Data Recorder Device which monitors & records specific
flight operation parameters for analysis after an accident The “BLACK BOX”
Which is actually bright orange
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FDR
Required on all commercial airliners since 1958
Records the last 25 hours of flight Located in the aircraft tail Fire & “G” resistant Transmits a locator signal so it can be
found in the wreckage
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FDR
Parameters Altitude & Airspeed Attitude & Direction Vertical acceleration Landing gear position Flight control position Engine power Greenwich mean time “ZULU time”
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CVR
Cockpit Voice Recorder Records the last 30 minutes of the flight
deck voice communications Microphone in the cockpit Recorder in the tail Crush & fire resistant Transmits a locator signal so it can be
found
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Intercom System
Cabin interphone system Amplified audio signals allow
communication between members of the flight crew or with the passengers
Public address system
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Intercom System
Service Interphone System Allows communication between flight crew
& ground personnel or mechanics
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The End! (for today)