SSR

Question 1

SSR principle

Answer 1

Moded and coded pulses

Question 2

SSR Frequency

Answer 2

1030MHz-1090MHz

Question 3

SSR Frequency band

Answer 3

UHF

Question 4

Transmitter transmits pair of pulses at ___ freq

Answer 4

1030MHz

Question 5

Transponder replies to interrogation at ___ freq

Answer 5

1090MHz

Question 6

A/C responds to interrogation in the form of __

Answer 6

2 framing pulses F1 and F2

Question 7

Time interval b/w pulse 1 and pulse 2

Answer 7

2 microseconds (always ie fixed)

Question 8

Time interval b/w pulse 1 and pulse 3 decides___?

Answer 8

Mode
It is called mode determining spacing

Question 9

Mode A interval b/w P1 and P3 and use

Answer 9

8 microseconds

Used only for a/c identification

Question 10

Mode B interval b/w P1 and P3 and use

Answer 10

17microseconds

Not in use

Question 11

Mode C interval b/w P1 and P3
and use

Answer 11

21microseconds

Used for
1)Identification and
2)Pressure altitude (1013.25 hPa)

Question 12

P2 transmitted for___

Answer 12

Side lobe separation

Question 13

In Special positioning identifying pulse (SPI), upon pressing Squawk ident button the pulse beeping will been for___

Answer 13

20seconds continuously

Question 14

In SPI, when does pulse blip for 20seconds ?

Answer 14

AFTER the last framing pulse

Question 15

Mode C provides

Answer 15

Pressure altitude 1013.25hpa
AC ident

Question 16

In case of Discrepency of ___feet b/w altimeter of ac and mode C transponder

Answer 16

+/- 300ft

Question 17

+/- 300ft diff in mode c and pressure altimeter. What should be turned off

Answer 17

Mode C should be turned off

Question 18

Number of codes available in mode C

Answer 18

4096

Question 19

Numbers omitted from SSR codes

Answer 19

7 and 8 not used

Question 20

Code 7500

Answer 20

Hijacking / unlawful interference

Question 21

Code 7600

Answer 21

Radio failure / communication failure

Question 22

Code 7700

Answer 22

Distress/ emergency

Question 23

Code 0000

Answer 23

Transponder failure

Question 24

Code 2000

Answer 24

No code allotted

Question 25

Code 1200

Answer 25

VFR

Question 26

Mode C altitude read out ?

Answer 26

+/- 50feet

Question 27

Mode S altitude read out

Answer 27

+/- 25 feet

Question 28

Mode S number of available codes

Answer 28

16 million

Question 29

2 Advantages of mode S

Answer 29

Reduces RT workload
Data link communications