Week 1 Flashcards
What is the difference between primary and secondary radars?
Primary relies on reflected energy for detection, secondary transmits responses to ‘interrogations’.
Interrogating radars operate at what frequency?
1030Mhz
Transponders operate at what frequency?
1090Mhz
Military a/c uses IFF in what modes?
1 - 5
Civil a/c use SSR in which modes?
A, B, C and S
Which mil IFF and civ SSR modes are the same?
IFF mode 3 and SSR mode A
3/A
What is the PROWORD for a 4 digit code?
Squawk
What do the digits in a SQUAWK represent?
- The first two digits - agency controlling the a/c
- The second two digits - specific to that a/c
What are the civil modes of operation?
A - 4096 codes
B - backup for A
C - altitude info
S - 24 bit unique a/c address
What are the military modes of operation?
1 - platfrom function 2 - platform ID 3 - equivalent to mode A 4 - encrypted response 5 - encrypted data transfer
What are the main three conspicuity codes (SQUAWKS)?
7700 - emergency
7600 - loss of comms
7500 - unlawful interference
What is FRUIT?
False Returns Unsynchronised In Time
Which mode helps to reduce FRUIT?
Mode S
What does TCAS stand for?
Traffic Collision Avoidance System
What are the two types of TCAS warnings?
Traffic and resolution.
What does a Resolution Advisory (RA) give?
Climb/decent instructions
What is the purpose of a Traffic Advisory (TA) warning?
To give the crew a ‘heads up’ warning of approaching aircraft.
A TCAS warning should be actioned …. advising the controller.
BEFORE
Define an FIR.
It is an area of defined dimensions within which flight info and alerting services are provided.
What is the purpose of an Flight Info Service (FIS)?
To give advice and info useful for the safe and efficient conduct of flight.
What is the purpose of an Alerting Service?
It is provided to notify appropiate organisations regarding a/c in need of search and rescue (SAR) aid and to assist such organisations as required.
How is the FIR divided?
- Surface to FL245
- FL245 to FL660
What are the two ATCCs?
London (Swanwick) and Scottish (Prestwick)
What are responsibilites of Swanwick Mil?
- distress and diversion services
- FIS
- Air Defence notification