Mode A & C

Question 1

The military developed an identification system known as?

Answer 1

IFF or Identification Friend or Foe

Question 2

How is this identification process accomplished?

Answer 2

The use of airborne transponders and ground based interrogation systems

Question 3

What happens during this identification process?

Answer 3

The transponder is interrogated by the ground station and the transponder replies with the code

Question 4

When an aircraft can be located and identified, it can then be?

Answer 4

Separated from other aircraft in the ATC environment

Question 5

What does RADAR stand for?

Answer 5

Radio Detection and Ranging

Question 6

What determines the distance to the target?

Answer 6

The amount of time to the target and back

Question 7

What does PSR stand for and which radar does it operate on?

Answer 7

Primary Surveillance Radar
Operates on the normal radar

Question 8

What does SSR stand for and what does it operate on?

Answer 8

Secondary Surveillance Radar
Operates on a coded reply from the airborne transponder

Question 9

The SSR interrogates the transponder in one or two modes:

Answer 9

Mode A for identification
Mode C for altitude reporting

Question 10

What gives ATC the location (horizontal and vertical) and identification of aircraft under their control?

Answer 10

ATCRBS

Question 11

Who are the reply codes set by?

Answer 11

The pilot

Question 12

What is it called when aircraft’s are communicating?

Answer 12

Sqwak calls

Question 13

What modes does a transponder use to respond?

Answer 13

Mode A and C

Question 14

How is altitude information supplied to the transponder?

Answer 14

By an altitude digitizer

Question 15

If the ground controller has requested the pilot to send the special IDENT function with the replies, the aircraft will be displayed as:

Answer 15

A double arc and a bloom

Question 16

The peak power transmitted from the transponder is ______ and extends the useful distance of the SSR to approximately _______.

Answer 16

300 Watts
200 Miles

Question 17

How is the altitude information sent to the transponder?

Answer 17

Through a wiring harness interface

Question 18

The altitude information is provided by the altimeter itself and not what?

Answer 18

Not a special altitude transducer

Question 19

The codes the encoder uses to relay the binary digitized altitude information are called what?

Answer 19

Grey Codes

Question 20

The type of interrogation is determined by what?

Answer 20

The spacing between two pulses (P1&P3) transmitted by the SSR on a carrier of 1030 MHz +_ 0.2

Question 21

What is the spacing for Mode A P1 and P3?

Answer 21

8 microS +_ 0.2

Question 22

What is the spacing for Mode C P1 & P3?

Answer 22

21 microS +_ 0.2
Also contains third pulse (P2)

Question 23

What pulse does P2 transmit?

Answer 23

2 microS +_ 0.15

Question 24

What is the purpose of the P2 pulse?

Answer 24

Allows the airborne transponder to determine whether the interrogation came from the main beam or a side lobe of the SSR

Question 25

What happens if the transponder has been interrogated by side lobe?

Answer 25

No reply is generated

Question 26

If P1 is larger than P2 the interrogation is:

Answer 26

A valid main beam interrogation

Question 27

If P2 is equal to or larger than P1 the interrogation is:

Answer 27

From a side lobe of the SSR

Question 28

The transponder replies to both the Mode A and C interrogations with:

Answer 28

A coded pulse group a carrier of 1090 MHz +_ 3

Question 29

The transponder is required certification every:

Answer 29

24 Calendar Months

Question 30

What text provides the testing standards, certification, and equipment to perform the test?

Answer 30

FAR part 43 appendix F

Question 31

Testing of Mode A will:

Answer 31

Test the validity of the entered aircraft code

Question 32

Testing of Mode C will:

Answer 32

Validate the correct altitude reporting

Question 33

Testing of the pitot-static system is required under:

Answer 33

FAR part 91.411
Appendix E

Question 34

The binary system used for this octal notation and this identification number consists of:

Answer 34

four digits (O through 7), which gives the transponder the capability of 4096 different identification numbers

Question 35

How many pulses can the coding of a Mode A reply consist of?

Answer 35

fifteen

Question 36

12 of the 15 pulses for the coding of a Mode A reply carry what?

Answer 36

The identification number

Question 37

The two other pulses from the fifteen are called?

Answer 37

Framing pulses
One placed at the beginning of the 12 and one at the end of the 12

Question 38

What is the last pulse of the 15?

Answer 38

A special pulse identification to aid the radar operator

Question 39

Mode C uses how many data bits to encode the aircraft altitude?

Answer 39

10

Question 40

What is pressure altitude transmitted at?

Answer 40

29.92 Hg and is corrected at the ground station

Question 41

What does the Cavity Oscillator do?

Answer 41

Employs a triode vacuum tube to generate the necessary RF Power

Question 42

What does the Altitude Alert System do?

Answer 42

Signals an alert when the altitude displayed to the flight crew deviates from the selected altitude

Question 43

What text should you consult about Altimetry System Error Containment?

Answer 43

FAA Appendix G Part 91

Question 44

What version of TCAS II must all aircraft have after March 2002?

Answer 44

Version 7.0 or later

Question 45

Authority for an operator to conduct flight airspace where RVSM is,
is issued in:

Answer 45

Operations specifications, a letter of authorization, or management specifications

Question 46

Some things that can affect transponder performance:

Answer 46

Corrosion
Bad coax
Actual poor performance from the transponder