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Aviation Communication and Phraseology (AV 621) > Transponder and ELT > Flashcards

Transponder and ELT Flashcards

1
Q

This is an avionic system located on board the aircraft that provides information about the aircraft identification and altitude to the ATC system on the ground and to TCAS on other aircraft

A

Transponder

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2
Q

This is a wireless communication, monitoring or control device that picks up and automatically responds to an incoming signal. They are typically used for detecting, identifying and locating objects.

A

Transponder

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3
Q

What are the two different frequencies that the cooperative surveillance system uses?

A

1030 MHz for interrogations to aircraft transponder and 1090 MHz for the replies or response from the transponder

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4
Q

What are the three importances of using different frequency for interrogation and reply?

A
  • To monitor and report the performance and the use of this radio frequency band (RF)
  • To detect and investigate the unexpected transmission on these frequencies
  • To study and interoperability impact between existing and new systems on this RF band
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5
Q

How does a transponder work? (Explain in your own understanding then check if you’re correct)

A
  • First the ground interrogator ( or in the case of TCAs the airborne interrogator) transmits an interrogation sequence on 1030 MHz (either continuously to all aircraft in the vicinity for Mode A/C or selectively to a single aircraft for Mode S)
  • Upon recipt, the transponder on-board the aircraft immediately responds on 1090MHz
  • Once the return signal is received by the ground station, the data is processed and relayed on to the controller’s display
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6
Q

Transponder operations are standardized in which ICAO Annex?

A

ICAO Annex 10 Volume IV (Surveillance Radar and Collision Avoidance Systems)

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7
Q

This is an airborne system designed to increase cockpit awareness of nearby aircraft service as a last defense against mid-air collisions

A

Traffic Alert and Collision Avoidance System (TCAS)

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8
Q

The system monitors airspace around an aircraft for other “transponder equipped” aircraft that may present a collision threat

A

Traffic Alert and Collision Avoidance System (TCAS)

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9
Q

True or False. TCAS relies on transponder signals to detect potential conflicts and provide Traffic Avenue (TAs) and Resolutions Advisories (RAs) to the Pilot

A

False. Traffic Advisories (TAs)

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10
Q

This equipment transmits an identifying code only - aircraft identification. It only transmit a four-digit squawk code

A

Mode A

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11
Q

This equipment enables the ATC to see the aircraft altitude or flight level automatically

A

Mode C

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12
Q

This is the most widely used transponder mode. Combined with A, ATC and other aircraft can receive an aircraft’s unique squawk code, position and altitude

A

Mode C

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13
Q

This equipment has altitude capability and permits data exchange in between aircraft

A

Mode S

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14
Q

This is short for Mode Select. This is a type of transponder that offers more advanced communication capabilities than mode A or Mode C. They can interrogate with aircraft having mode A or mode C transponders.

A

Mode S

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15
Q

State the transponder switches

A
  • OFF
  • SBY
  • ON
  • ALT
  • TST
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16
Q

This switch disconnects power to the unit

A

OFF

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17
Q

This switch means standby, applies electrical power but does not emit a signal

A

SBY

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18
Q

This switch is operation in Mode A (identification only)

A

ON

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19
Q

This switch is altitude, sets Mode A and Mode C

A

ALT

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20
Q

This switch is test, confirms operation of the transponder

A

TST

21
Q

What are the critical data transmitted by a mode S transponder?

A
  • Unique ICAO Address
  • Squawk Code
  • Altitude
  • Position, Speed, and Heading
  • Additional Flight-Related Data
22
Q

What are the two systems that make mode S transponders incredibly valuable?

A

Traffic Collision Avoidance Systems (TCAS) and Automatic Dependent Surveillance - Broadcast (ADS-B)

23
Q

How many different combinations are there for transponder codes?

A

4096

24
Q

What is the transponder code for Visual Flight Rules (VFR)?

A

1200

25
Q

Which airspaces requires an aircraft to use/have transponders while operating?

A

Class A,B and C airspace

26
Q

This is from a system used in WWII called “identification, friend or foe (FF)” - “parrot”

A

Squawk

27
Q

This refers to the various ways an aircraft’s transponder communicates with ATC and other aircraft.

A

Transponder “mode”

28
Q

This is a specific four-digit number that you, as the pilot, will input into your transponder. This is also known as a “squawk code” and is assigned by ATC to identify your aircraft

A

Transponder “code”

29
Q

What does 7500 mean and what does 75 mean?

A

7500 - Unlawful interference/ Hijacking
75, let the other guy drive
7600 - Lost Radio / Communications Failure
76, radio fix
7700 - General Emergency
77, going to heaven

30
Q

This is an equipment which broadcasts distinctive signals on designated frequencies and depending on application, may be automatically activated by impact or be manually activated

A

Emergency Locator Transmitter (ELT)

31
Q

Once the ELT is operational, its signals are received by what?

A

COSPAS-SAR-SAT satellites

32
Q

ELTs were originally intended for use on which frequency? (to alert ATC and other aircraft monitoring this frequency)

A

121.5 MHz

33
Q

Satellite monitors today utilizes which frequency? While ground-based receivers such as local airport facilities and air traffic control facilities use which frequency?

A

406 MHz , 121.5 MHz

34
Q

What is the identity that the ELT transmits?

A

A 15 character hexadecimal code including the ICAO 24 bit code of the aircraft

35
Q

In 1982, which satellite-based monitoring system was implemented?

A

Cosmicheskaya Sistyema Poiska Avariynich Sudov - Search and Rescue Satellite-Aided Tracking (COSPAS-SARSAT)

36
Q

This means “Space System for the Search of Vessels in Distress”

A

COSPAS

37
Q

This satellite network can detect the location of the ELT with an accuracy of 2 to 5 km.

A

COSPAS-SARSAT

38
Q

This is the national agency in the Philippines responsible for initiating Search and rescue

A

CAAP’s Operation and Rescue Coordination Center (ORCC)

39
Q

In which frequency do modern ELTs operate on?

A

406 MHz

40
Q

True or False. The first ELTs operated on the 121.5 MHz and they could only be detected by overflying commercial or military aircrafts

A

True

41
Q

When did COSPAS-SARSAT announce that it will cease detection on 121.5 MHz?

A

February 1st, 2009

42
Q

Which frequency do military aircraft with ELTs use before?

A

243 MHz

43
Q

This is an automatically activated ELT which is permanently attached to an aircraft

A

Automatic fixed ELT - ELT (AF)

44
Q

This is an automatically activated ELT which is rigidly attached to an aircraft but readily removable from the aircraft

A

Automatic portable ELT - ELT (AP)

45
Q

This is an ELT which is rigidly attached to an aircraft which is automatically deployed and activated by impact, and, in some cases, also by hydrostatic sensors. Manual deployment capability is also provided

A

Automatic deployable ELT - ELT (AD)

46
Q

This is an ELT which is removable from an aircraft, stored to facilitate its ready use in an emergency, and manually activated by survivors

A

Survival ELT - ELT (S)

47
Q

What does Annex 10 Volume V stand for?

A

Annex 10 - Aeronautical Telecommunications / Volume V - Aeronautical Radio Frequency Spectrum Utilization

48
Q

What does Annex 6 stand for and state its three parts

A

Annex 6 - Operational of aircraft

Part I - International Commercial Air transport - Aeroplanes

Part II - International General Aviation

Part III - International Operations - helicopters

Aviation Communication and Phraseology (AV 621) (6 decks)

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