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#1. The special SSR codes are as follows: emergency ______, radio failure _______, entering UK airspace _______, unlawful interference with the conduct of the flight ________
Remember. I C E
7500 – Interference hijacking
7600 – Comm failure
7700 – Emergency,
2000 – when no instructions given
#2. Secondary Surveillance Radar is a form of ________ radar with type emissions operating in the _________ band.
Aircraft receives at 1030 MHz and transmits omni- directionally at 1090 MHz. (in the UHF band).
#3. If the SSR transponder IDENT button is pressed
Special Position Identification (SPI) pulse may be transmitted together with the information pulses when the “Ident” button on the pilot’s transponder is pressed, usually at ATC’s request. This pulse is after the last framing pulse and will be automatically and continuously transmitted for about 20 seconds. It produces a distinctive display so that a controller can pick out a particular aircraft by asking the pilot to “Squawk Ident”.
#4. When using SSR the ground controller will ask the pilot to cancel mode C if there is a discrepancy of more than ______ feet between the altitude detected by the radar from the reply pulses and the altitude reported by the pilot read from an altitude with the subscale set to _______:
If, on verification, there is a difference of more than 300ft between the level readout and the reported level, the pilot will normally be instructed to switch off Mode C. If independent switching of Mode C is not possible the pilot will be instructed to select Code 0000 to indicate transponder malfunction.
#5. The SSR code which is appropriate for a UK FIR (inbound. crossing, where no other “squawk” has been allocated is:
Remember. I C E
7500 – Interference hijacking
7600 – Comm failure
7700 – Emergency,
2000 – when no instructions given
#6. Secondary radars require:
Primary radar relies on the reception of a reflected pulse i.e. the echo of the transmitted pulse. Secondary radar, on the other hand, receives pulses transmitted by the target in response to interrogation pulses. Secondary surveillance radar (SSR) is one type of secondary radar system; DME is another such system
target could be on ground or air