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Question 219-1 : The pictures at reference are showing an aircraft's position with respect to some thunderstorm cells and the image the pilot is getting from the radar. to detect this blind alley the pilot should. 2071 ? [ Preparation civilian ]

Increase the range setting of his radar.

Increase the range setting of his radar will permit to the pilot to see whether there is continued clear weather further. exemple 319 Increase the range setting of his radar.

Question 219-2 : The 'gain' control knob of an awr airborne weather radar adjusts ?

The receiver sensitivity in order to achieve optimum target acquisition.

exemple 323 The receiver sensitivity in order to achieve optimum target acquisition.

Question 219-3 : Which statement is correct with respect to selections on the transponder control panel ?

With alt selected a reply in the modes a, c and s can be transmitted.

.turn your transponder to the alt position, it enables it to respond to mode a, mode c and mode s interrogations. even if you don't have an altitude encoder installed, you should operate your transponder in the alt mode. the reason for this is that the ground station is still looking for framing pulses from your transponder, even if there's no altitude information accompanying them. exemple 327 With alt selected a reply in the modes a, c and s can be transmitted.

Question 219-4 : Echoes that do not change in distance from the antenna relative speed zero of a ground radar with a moving target indicator mti are dangerous for the following reason ?

The moving target indicator mti eliminates such echoes.

Moving target indicator.mti makes use of doppler to eliminate returns from fixed objects such as hills or buildings. the radar will only display returns that show a doppler shift, i.e. moving targets, but a target maintaining a constant range would not show up. exemple 331 The moving target indicator (mti) eliminates such echoes.

Question 219-5 : Mode s..the allocation of 24 bit aircraft addresses is described in the icao annex 10, it states that ?

Every aircraft will have been allocated with an icao aircraft address which is hard coded into the airframe.

.icao annex 10 volume 3 communications systems.chapter 5 ssr mode s air ground data link.aircraft address a unique combination of 24 bits available for assignment to an aircraft for the purpose of air ground communications, navigation and surveillance...chapter 9 aircraft addressing system.9.1 the aircraft address shall be one of 16 777 214 twenty four bit aircraft addresses allocated by icao to the state of registry or common mark registering authority and assigned as prescribed in the appendix to this chapter...appendix to chapter 9 a worldwide scheme for the allocation, assignment and application of aircraft addresses.1. general.1.1 global communications, navigation and surveillance systems shall use an individual aircraft address composed of 24 bits. at any one time, no address shall be assigned to more than one aircraft. the assignment of aircraft addresses requires a comprehensive scheme providing for a balanced and expandable distribution of aircraft addresses applicable worldwide. exemple 335 Every aircraft will have been allocated with an icao aircraft address which is hard coded into the airframe.

Question 219-6 : Mode s..how does a ground interrogation signal mode a and c is transmitted to a transponder ?

In the form of pairs of interrogative pulses with an additional control pulse.

exemple 339 In the form of pairs of interrogative pulses with an additional control pulse.

Question 219-7 : The magnetic heading of an aircraft is 040°. on the airborne weather radar display the relative bearing of and the distance to the most southerly part of lands end approximate position 50°03'n , 005°40'w are, 030°r and 80 nm..what is the position of the aircraft based on these observations. 2068 ?

49°25'n , 007°30'w

Relative bearing = 040° + 030° = 070°..applied the variation 6°west on the chart , so 070° 6° = 064°..064° + 180 ° = aircraft is on a bearing of 244° true from the station...now plot a position line 80 nm from the position 50°03'n , 005°40'w...you are at position 49°25'n , 007°30'w.. 1695 exemple 343 (49°25'n , 007°30'w)

Question 219-8 : The airborne weather radar ?

May receive no reflections from a thunderstorm in an area behind a heavy rain shower.

.the danger of the area behind heavy rain shadow area exists because no radar waves can penetrate deeply enough inside. exemple 347 May receive no reflections from a thunderstorm in an area behind a heavy rain shower.

Question 219-9 : The spacing between the two pulses transmitted by an ssr interrogator determines ?

What mode is used.

exemple 351 What mode is used.

Question 219-10 : When the atc transponder 'ident' button is pressed by the pilot ?

The airplane's symbol on the controller's display will flash or 'fill in'.

exemple 355 The airplane's symbol on the controller's display will flash or 'fill in'.

Question 219-11 : On a typical computer generated ssr display the following data on a particular flight will be shown ?

Squawk code, flight level, ground speed, airplane callsign.

exemple 359 Squawk code, flight level, ground speed, airplane callsign.

Question 219-12 : In the ssr response, the operation of the transponder ident button ?

Sends a special pulse after the normal response pulse train.

exemple 363 Sends a special pulse after the normal response pulse train.

Question 219-13 : Which one of the following switch positions should be used when selecting a code on the transponder ?

Stby standby.

exemple 367 Stby (standby).

Question 219-14 : In the ssr terminology 'de fruiting' means ?

The removal from the display of random responses.

exemple 371 The removal from the display of random responses.

Question 219-15 : The selection of code 2000 on an aircraft ssr transponder indicates ?

Entry into airspace from an area where ssr operation has not been required.

exemple 375 Entry into airspace from an area where ssr operation has not been required.

Question 219-16 : With ssr, interrogation and response signals ?

Are standard frequencies separated by 60 mhz.

.ssr is fixed on 1030 mhz and 1090 mhz. exemple 379 Are standard frequencies separated by 60 mhz.

Question 219-17 : Using ssr, the normal transmission from the atc transponder in the aircraft consists of ?

The two pulses received plus an additional number of pulses between them.

exemple 383 The two pulses received plus an additional number of pulses between them.

Question 219-18 : With regard to ssr ?

The interrogator is on the ground and transponder is in the aircraft.

exemple 387 The interrogator is on the ground and transponder is in the aircraft.

Question 219-19 : When a mode c check is carried out, and assuming the equipment is working without error, the mode c will report a pressure altitude of 35064 ft as ?

Fl351.

.the altitude information sent with a transponder mode c is in hundreds of feet with an accuracy to + or 50 ft..35064 ft will be encoded as 351 35100 ft, 35064 ft is round to the nearest hundred. exemple 391 Fl351.

Question 219-20 : In ssr, the interrogations use different modes. if altitude reporting is required, the aeroplane's transponder should be set to 'alt' and will respond to ?

Mode c and a interrogations.

exemple 395 Mode c and a interrogations.

Question 219-21 : The atc transponder system, excluding mode s, contains ?

Two modes, each 4096 of codes.

exemple 399 Two modes, each 4096 of codes.

Question 219-22 : A mode s transponder ?

Responds normally to mode a or c interrogations.

exemple 403 Responds normally to mode a or c interrogations.

Question 219-23 : 'fruiting' is caused by ?

Aeroplane at range responding to interrogations from another atc radar station.

exemple 407 Aeroplane at range responding to interrogations from another atc radar station.

Question 219-24 : The carrier frequency of the ssr atc reply transmission air to ground is ?

1090 mhz + or 3 mhz.

.icao annex 10, volume 4, chapter 3...3.1.1.2 reply carrler frequency air to ground..3.1.1.2.1 the carrier frequency of the reply transmission shall be 1 090 mhz...3.1.1.2.2 the frequency tolerance shall be plus or minus 3 mhz. exemple 411 1090 mhz + or - 3 mhz.

Question 219-25 : A mode s transponder receives among other pulses a long p4 pulse from an interrogator. what does this mean ?

The interrogator transmits a mode a/c/s all call.

.short p4 pulse mode a/c only all call..long p4 pulse mode a/c/s all call. exemple 415 The interrogator transmits a mode a/c/s all call.

Question 219-26 : A mode a/c transponder receives a p2 pulse from which the amplitude is smaller than that of the p1 and p3 pulse. what is the reason ?

The transponder is located in the direction of the main lobe of the interrogator antenna.

. 2621 exemple 419 The transponder is located in the direction of the main lobe of the interrogator antenna.

Question 219-27 : A mode a/c transponder receives a p2 pulse from which the amplitude is larger than that of the p1 and p3 pulse. what is the reason ?

The transponder is located in the direction of one of the side lobes of the interrogator antenna.

. 2621 exemple 423 The transponder is located in the direction of one of the side lobes of the interrogator antenna.

Question 219-28 : What determines the operating mode a or c of the ssr transponder ?

The time interval between the pulses p1 and p3.

. 2621. 1666 exemple 427 The time interval between the pulses p1 and p3.

Question 219-29 : What is one of the differences between a mode a/c/s all call and a mode a/c only all call ?

The length of the pulse p4.

.short p4 pulse mode a/c only all call..long p4 pulse mode a/c/s all call...the time interval between the pulses p1 and p3 determines the operating mode a or c of the ssr transponder. exemple 431 The length of the pulse p4.

Question 219-30 : The time interval between the interrogating pulses p1 and p3 in mode c is ?

21 us.

. 1666 exemple 435 21 us.

Question 219-31 : The time interval between the interrogating pulses p1 and p3 in mode a is ?

8 us.

. 1666 exemple 439 8 us.

Question 219-32 : Ssr transponder...mode s provides ?

25 possible reply forms.

exemple 443 25 possible reply forms.

Question 219-33 : The equipment that uses the pulse modulation technique is the ?

Radar.

.pulse modulation a modulation form used in radar by transmitting short pulses followed by larger interruptions. exemple 447 Radar.

Question 219-34 : Ssr transponder...in intermode, a short p4 pulse makes it possible to perform a call ?

A/c.

exemple 451 A/c.

Question 219-35 : Ssr transponder...a mode a/c transponder ?

Responds to mode s interrogations but can not send data.

exemple 455 Responds to mode s interrogations but can not send data.

Question 219-36 : The main advantage of ssr over a primary radar is ?

Air traffic control ssr systems can interrogate the transponder of an aircraft and obtain answers.

exemple 459 Air traffic control ssr systems can interrogate the transponder of an aircraft and obtain answers.

Question 219-37 : What is the accuracy of mode s altitude reporting ?

25 feet.

.mode s can provide enhanced vertical tracking, using a 25 feet altitude increment. exemple 463 25 feet.

Question 219-38 : To increase the maximum range of a radar, it is necessary to ?

Decrease the recurrence frequency and to increase the wavelength.

exemple 467 Decrease the recurrence frequency and to increase the wavelength.

Question 219-39 : Ssr transponder...with the 'enhanced' mode s, additional aircraft parameters can be downloaded by the atc ?

Ias, vertical rate, roll angle.

Ecqb04, november 2017....enhanced mode s surveillance consists of the extraction of additional aircraft parameters known as downlink aircraft parameters dap consisting of.. magnetic heading.. indicated airspeed.. mach number.. vertical rate.. roll angle.. track angle rate.. true track angle.. ground speed.. selected altitude...note tas is provided if track angle rate is not available. exemple 471 Ias, vertical rate, roll angle.

Question 219-40 : An antenna is defined as a ?

Wave type transducer for the process of converting a line ac into a free electromagnetic wave.

Ecqb04, november 2017.


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