Test 120 exam questions on Radio Navigation for ATPL

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1 - On what data is a VOR/DME Area Navigation system operating in the dead reckoning mode? TAS from the Air Data Computer Heading from the aircraft compass TAS from the Air Data Computer Near the coast and the bearing crosses the coast at right angles

2 - An aircraft is flying a 3° glidepath and experiences a reduction in groundspeed from 150 kt at the outer marker to 120 kt over the threshold. The effect of this change in groundspeed on the aircraft's rate of descent will be a decrease of approximately: 50 FT/MIN 250 FT/MIN 100 FT/MIN 150 FT/MIN

3 - In order to obtain an ADF bearing on a system using sense and loop aerials, the: Signal must be received by both the sense and loop aerials BFO switch must be selected to 'ON' Mode selector should be switched to 'loop' Uses pulse technique to determine the radial.

4 - What is EGNOS (European Global Navigation Overlay System)? Local Area Differential GPS (LADGPS) GLONASS Wide Area Differential GPS (WADGPS) GPS, Aircraft Weather Radar, Navigation radios

5 - In ISA conditions, what is the maximum theoretical range at which an aircraft at FL80 can expect to obtain bearings from a ground VDF facility sited 325' above MSL? 158 NM 134 NM 114 NM 107 NM

6 - If the reference phase differs 30° with the variable phase the radial from the VOR station will be: 330° 210° 030° 150°

7 - A VOR and DME are co-located.You want to identify the DME by listening to the callsign. Having heard the same callsign 4 times in 30 seconds the: DME callsign is the one with the higher pitch that was broadcast only once VOR and DME callsigns were the same and broadcast with the same pitch DME callsign is the one with the lower pitch that was broadcast several times 6.8 km

8 - Which of the following radar equipment operate by means of the pulse technique?1. Aerodrome Surface Movement Radar2. Airborne Weather Radar3. Secondary Surveillance Radar (SSR)4. Aerodrome Surveillance (approach) Radar 1, 2 and 4 only 1, 2, 3 and 4 2 and 4 only 2, 3 and 4 only

9 - DME channels utilise frequencies of approximately: 1000 MHz 600 MHz 300 MHz The closer the receiver is to a LAAS ground reference station, the more accurate is the aircraft position fix.

10 - According to the ILS coverage area as defined by ICAO Annex 10, in which of the following situations will the pilot be guaranteed a reliable signal from the localiser? 19NM from touchdown inbound and 13° displaced from the localiser centreline. 27NM from touchdown inbound and 8° displaced from the localiser centreline. 10NM from touchdown inbound and 38° displaced from the localiser centreline. 20NM from touchdown inbound and 8° displaced from the localiser centreline.

11 - What is the colour sequence when passing over an Outer, Middle and Inner Marker beacon? Amber - white - green Blue - amber - white Blue - green - white White - amber - blue

12 - The BFO selector on an ADF receiver is used to: Hear the IDENT of some NDB stations radiating a continuous wave signal Find the loop 'null' position Hear the IDENT and must always be switched ON The GNSS can be used to update the FMS position from a drifting IRS.

13 - Which of the following lists all the stages of flight when is it possible to change the route in the active flight plan on an FMS equipped aircraft? Only before the flight plan is activated Only before take-off Only once the aircraft is airborne. At any time before take-off and throughout the flight

14 - If a failed RMI rose is stuck on 090° and the ADF pointer indicates 225°, the relative bearing to the station will be: Impossible to read, due to failure RMI. 315°. 135°. 225°.

15 - The skip distance of HF-transmission will increase with: Lower frequency and higher position of the reflecting ionospheric layer Higher frequency and higher position of the reflecting ionospheric layer Lower frequency and lower position of the reflecting ionospheric layer North

16 - The two main design functions of Secondary Surveillance Radar (SSR) Mode S are: Collision avoidance using TCAS II and improved long range (HF) communication capability. Air to ground and ground to air data link communications and improved ATC aircraft surveillance capability The elimination of ground to air communications and the introduction of automatic separation between aircraft using TCAS II Aeroplane is circling around the station

17 - How does the Electronic Flight Instrument System display of a B737-400 respond to the failure of a VHF navigation (VOR) receiver? The pointer rotates around the display and a VOR 1 or 2 failure warning bar appears It removes the associated magenta deviation bar and/or pointer from the display The pointer flashes and a VOR 1 or 2 failure warning bar appears The deviation bar and/or pointer change colour to red and flash intermittently

18 - What drift is being experienced?

8° Left 12° Right 20° Left Combined azimuth and elevation transmitter, DME facility

19 - How does a NAVSTAR/GPS satellite navigation system receiver recognise which of the received signals belongs to which satellite? Each satellite transmits its signal, on common frequencies, with an individual Pseudo Random Noise code Each satellite transmits its signal on a separate frequency The receiver detects the direction from which the signals are received and compares this information with the calculated positions of the satellites True airspeed

20 - Which one of the following is an advantages of a multi-sensor system using inputs from a global navigation satellite system (GNSS) and an inertial reference system (IRS)? The GNNS is never used as an input in a multi-sensor system. The FMS always uses average position calculated from the GNSS and the IRS. The activation of 'Selective Availability' can be recognised by the INS. The aircraft's receiver measuring the phase angle of signals received from a number of satellites in known positions

21 - Which of the following is likely to have the greatest effect on ADF accuracy? Interference from other NDBs, particularly during the day Frequency drift at the ground station Mutual interference between aircraft aerials 107 NM

22 - What is the "Q" code for a magnetic bearing from a VDF station? "Request QTE". "Request QNH". "Request QDM". "Request QDR".

23 - Which one of the following inputs to an Area Navigation System (R-NAV) comes from an external, not on-board, system? Inertial Navigation System (INS) position Magnetic heading Pressure altitude VOR/DME radial/distance

24 - An aircraft passes overhead a DME station at 12000 feet above the station. At that time, the DME reading will be: 0 NM. Approximately 2 NM. Fluctuating and not significant. Interference from other NDBs, particularly at night

25 - In accordance with ICAO Annex 10 the NAVSTAR/GPS global average 95% position accuracy in SPS should be: 22m in 3D 30m horizontally 5m vertically The data is based on the direction to the satellite determined at the location of the antenna

26 - A typical frequency employed in Distance Measuring Equipment (DME) is: 100 MHz 10 MHz 100 GHz SHF band and uses frequency modulation techniques

27 - The geometric shape of the reference system for the satellite navigation system NAVSTAR/GPS, defined as WGS 84, is: A mathematical model that describes the exact shape of the earth A sphere An ellipsoid Only the 1575 MHz carrier wave and one code

28 - Which of the following combinations is likely to result in the most accurate Area Navigation (RNAV) fixes? VOR/DME DME/DME VOR/VOR ETD

29 - What is the aircraft track?

272°(M) 280°(M) 260°(M) 300°(M)

30 - The aircraft DME receiver cannot lock on to interrogation signals reflected from the ground because: DME transmits twin pulses Reflections are subject to doppler frequency shift DME pulse recurrence rates are varied 1000 MHz

31 - The letters QTX and adjacent symbol indicate a:

VOR TACAN Airport Figure 2

32 - An aircraft is situated at 30°N - 005°E with a magnetic variation of 10°W. A VOR is located at 30°N - 013°E with a magnetic variation of 15°W.The aircraft is situated on the VOR radial: 101° 281° 256° Interference from other transmitters

33 - What is measured in order to establish aircraft position in relation to the localiser beam on an ILS? The bearing to the localiser antenna found by means of a loop antenna. The difference in phase between the 90 Hz modulation and the 150 Hz modulation. The difference in time between the 90 Hz modulation and the 150 Hz modulation. The difference in depth between the 90 Hz modulation and the 150 Hz modulation.

34 - In the Flight Management Computer (FMC) of the Flight Management System (FMS), data relating to cruising speeds is stored in the: Air data computer Navigation database Performance database Beyond 100 NM because insufficient antenna tilt angle is available with the mapping mode

35 - The indicated range from a DME station is: 0 when passing overhead the station. Ground range. Ground range only if the beacon is co-located with VOR. Slant range.

36 - Which of the following is an ILS localiser frequency? 109.15 MHz 112.10 MHz 110.20 MHz Phase difference between emitted wave and reflected wave

37 - In what type of nominal orbit are NAVSTAR GPS satellites placed? Elliptical Geo-stationary Circular Height based on QFE

38 - Which of the following statements about the accuracy that can be obtained with the differential technique (D-GPS) of the satellite navigation system NAVSTAR/GPS is correct? A D-GPS receiver can detect and correct for SA providing a more accurate position fix The increase in accuracy of position fixes is independent of the receiver position in relation to a D-GPS ground station Only D-GPS allows position fixes accurate enough for 'Non Precision Approaches' The nearer a receiver is situated to a D-GPS ground station, the more accurate the position fix

39 - The frequency range of a VOR receiver is: 108 to 111.95 MHz 108 to 117.95 MHz 108 to 135.95 MHz 118 to 135.95 MHz

40 - In a 2D RNAV system you have entered the DME and VOR data for two waypoints. What do you use to work out the cross track errors when en-route from one to the other? Use the automatically computed values on the CDI/HSI. The pilot takes the VOR and DME information and computes it himself The pilot is presented with VOR/DME information which must then be correlated to the pressure instruments to determine the effect of altitude The four letter SELCAL code

41 - In which frequency band does the Microwave Landing System (MLS) operate? EHF VHF SHF UHF

42 - Which one of the following disturbances is most likely to cause the greatest inaccuracy in ADF bearings? Quadrantal error Coastal effect Precipitation interference Skywave distortion of the null position and is maximum at dawn and dusk

43 - Given:VOR station position N61° E025°, variation 13°EEstimated position of an aircraft N59° E025°, variation 20°E What VOR radial is the aircraft on? 347° 167° 193° 160°

44 - Which of the following statements about the accuracy that can be obtained with the LAAS (local area augmentation system) of the satellite navigation system of the satellite navigation system NAVSTAR/GPS is correct? A LAAS cannot correct for satellite timing and orbital position error. The increase in accuracy of position fixes is independent of the aircraft position in relation to the LAAS ground reference station. A LAAS corrects the position of the aircraft by relaying the information via a geo-stationary satellite. Pole to pole

45 - What is the minimum number of NAVSTAR/GPS satellites required to produce an accurate independent 3-D position fix? 4 3 24 Latitude, longitude and time

46 - In a Satellite-Assisted Navigation System (GNSS/GPS), a fix is obtained by: Measuring the time taken for a minimum number of satellites' transmissions, in known positions, to reach the aircraft's receiver Measuring the pulse lengths of signals received from a minimum number of satellites received in a specific sequential order Measuring the time taken for an aircraft's transmissions to travel to a number of satellites, in known positions, and return to the aircraft's receiver Inhibit unwanted ground returns

47 - GPS system satellites transmit their signals on two carrier waves 1575 MHz and 1227 MHz and supply two possible codes accessible according to user (civil or military).Commercial aviation is now able to use: Only the 1575 MHz carrier wave and two codes Only the 1227 MHz carrier wave and one code The two carrier waves and one public code SHF

48 - The influence of the ionosphere on the accuracy of the satellite navigation system NAVSTAR/GPS is: Minimised by computing the average of all signals Only significant if the satellites are located at a small elevation angle above the horizon Minimised by the receiver using a model of the atmosphere and comparing signals transmitted by the satellites Detect the larger water droplets

49 - An aircraft carrying out an ILS approach is receiving more 90 Hz than 150 Hz modulation notes from both the localiser and glidepath transmitters. The ILS indication will show: Fly left and fly up Fly right and fly down Fly right and fly up 24 seconds (= 1 second per data frame)

50 - The selection of code 7700 on an aircraft SSR transponder indicates: An emergency Unlawful interference with the planned operation of the flight Transponder malfunction Radio communication failure

51 - In an Airborne Weather Radar that has a colour cathode ray tube (CRT) increasing severity of rain and turbulence is generally shown by a change of colour from: Green to yellow to red Yellow to orange to red Green to red to black The frequencies employed are too high to give returns from moisture sources

52 - Assuming a five dot display on either side of the ILS localiser cockpit display, what is the angular displacement of the aircraft from the localiser centreline when the CDI is deflected 2 dots to the right? 2.0° to the right. 2.0° to the left. 1.0° to the right. 1.0° to the left.

53 - In accordance with Doc 8168, a pilot flying an NDB approach must achieve a tracking accuracy within ........ of the published approach track. +/-10° +/-2.5° +/-5° +/-2°

54 - The time taken for the transmission of an interrogation pulse by a Distance Measuring Equipment (DME) to travel to the ground transponder and return to the airborne receiver was 2000 micro-second, including time delay. The slant range from the ground transponder was: 186 NM 296 NM 158 NM The pulse recurrence rates are varied

55 - Precision RNAV (P-RNAV) requires a track-keeping accuracy of: ± 10.0nm for 95% of the flight time. ± 5.0nm for 95% of the flight time. ± 1.0nm for 95% of the flight time. 1300MHz

56 - The BFO selector switch on the ADF control panel must be in the 'on' position to enable the pilot to: Adjust the loop to the aural null position Hear the IDENT of NDBs using NON A1A transmissions Hear the IDENT of NDBs using NON A2A transmissions Stop the loop rotation

57 - The principle of operation of an ILS localiser transmitter is based on two overlapping lobes that are transmitted on (i).......... frequencies and carry different (ii).......... (i) different (ii) modulation frequencies (i) the same (ii) phases (i) different (ii) phases 095

58 - A DME is located at MSL.An aircraft passing vertically above the station at flight level FL 360 will obtain a DME range of approximately: 11 NM 7 NM 8 NM Altostratus

59 - On an ILS approach, the glidepath needle is fully down. How much deflection does this indicate? 0.7° 5° 10° 2.5°

60 - On which of the following displays are you able to get a direct read-out (no calculation is necessary from the pilot) of the magnetic bearing from the aircraft to the NDB? Moving card ADF and RMI. Fixed card ADF only. Moving and fixed card ADF. Fixed card ADF and RMI.

61 - The Flight Management Computer (FMC) position is: The actual position of the aircraft at any point in time The same as that given on the No. 1 IRS The computed position based on a number of sources (IRS, Radio, ILS, GPS etc) Clear air turbulence

62 - In the NAVSTAR/GPS satellite navigation system, re-use of Selective Availability would give the option to artificially degrade the accuracy by: Shutting off selected satellites Dithering the satellite clock Offsetting satellite atomic clocks by a predetermined constant amount Radio communication failure

63 - The heading rose of an HSI is frozen on 200°.Lined up on the ILS of runway 25, the localizer needle will be: Centred Centred with the 'fail' flag showing Right of centre Full scale deflection right with a 'to' indication

64 - If you are flying a back course ILS, you are flying a: Non precision approach on the reciprocal runway of the precision approach runway Precision approach on the precision approach runway Precision approach on the reciprocal runway of the precision approach runway Figure 2

65 - The main task of the user segment (receiver) of the satellite navigation system NAVSTAR/GPS is to: Transmit signals which, from the time taken, are used to determine the distance to the satellite To monitor the status of the satellites, determine their positions and to measure the time Select appropriate satellites automatically, to track the signals and to measure the time taken by signals from the satellites to reach the receiver WGS 84

66 - A radar facility transmitting at a Pulse Recurrence Frequency (PRF) of 1200 pulses/second will have a maximum unambiguous range of approximately: 135 NM 69 NM 27 NM Envelope matching

67 - An aircraft is 100 NM from a VOR facility. Assuming no error when using a deviation indicator where 1 dot = 2° deviation, how many dots deviation from the centre line of the instrument will represent the limits of the airway boundary? (Assume that the airway is 10 NM wide) 1.5 6.0 4.5 3.0

68 - What is the procedure to be followed if, on a flight under IFR conditions using the NAVSTAR/GPS satellite navigation system, the number of satellites required to maintain the RAIM (Receiver Autonomous Integrity Monitoring) function are not available? The flight has to be continued under VFR conditions The flight may be continued using other certificated navigation systems The flight may be continued as planned if at least 4 satellites are available and the pilot monitors the GPS-System manually +/- 2NM or better for 75% of the flight time

69 - What airborne equipment, if any, is required to be fitted in order that a VDF let-down may be flown? VOR VHF radio VOR/DME None

70 - Which of the following is one of the functions of the Computer in a basic RNAV system? It transfers the information given by a VOR/DME station into tracking and distance indications to any chosen Phantom Station/waypoint It calculates cross track information for NDB approaches It automatically selects the two strongest transmitters for the Area-Nav-Mode and continues working by memory in case one of the two necessary station goes off the air VOR/DME Area Navigation computer is receiving neither radial nor distance data information from VOR/DME stations.

71 - Which of the following frequency-bands is used by the Loran C navigation system? 1750 - 1950 kHz 90 - 110 kHz 978 - 1213 MHz 10.2 - 13.6 kHz

72 - An aircraft is on the 120° radial from a VOR station. Course 340° is selected on the HSI (Horizontal Situation Indicator).If the magnetic heading is 070°, the deviation bar relative to the aeroplane model, will be: In front Right Behind Left

73 - 'Night Effect' which causes loss of signal and fading, resulting in bearing errors from NDB transmissions, is due to: Static activity increasing at night particularly in the lower frequency band Interference from other transmissions and is maximum at dusk when east of the NDB The effect of the Aurora Borealis 1.25° above or below the correct glide path.

74 - What is the inclination to the equatorial plane of the satellite's orbit in the NAVSTAR GPS constellation? 45° 55° 65° WGS 84

75 - Which one of the statements below is correct regarding the DME? The DME operating frequencies are in the UHF frequency band. The DME ground station is always co-located with a VOR station. The indicated distance is the ground distance measured from the aircraft's projected position on the ground to the DME ground installation. Two lines of position obtained from two different DME's give an unambiguous fix.

76 - The principle used in VOR bearing measurement is: Phase comparison Difference in depth of modulation Beat frequency discrimination Envelope matching

77 - What is the heading bug selected to?

272°(M) 260°(M) 300°(M) FL50

78 - A Primary radar operates on the principle of: Phase comparison Transponder interrogation Continuous wave transmission Timing the interval between the reception of sequential secondary radar pulses from the MLS station to the aircraft

79 - Which of the following, if any, is a prerequisite if a receiver of a NAVSTAR/GPS satellite navigation system is to be used in combination with a multi sensor system? The prescribed IFR-equipment must be in working correctly and the navigation information continuously displayed The RAIM-function of the GPS receiver must be able to monitor all prescribed navigation systems The prescribed IFR-equipment must be installed and operational 36000 km

80 - Full scale deflection of the localiser needle indicates that the aircraft is approximately: 5° offset from the localiser centreline. 1.25° offset from the localiser centreline. 2.5° offset from the localiser centreline. 10° offset from the localiser centreline.

81 - Which of the following lists the phenomena least likely to be detected by radar? Turbulence in cloud that has precipitation Precipitation Wet snow and turbulence in cloud that has precipitation 308 pps

82 - In order to measure the radial from a VOR, the aircraft VOR receiver Measures the time difference between reception of the two signals transmitted from the ground installation. Measures the phase difference between the reference phase and the variable phase of the signal. Measures the time difference between sending the interrogation signal and receiving the transponder signal. Uses pulse technique to determine the radial.

83 - What is the value of the track from TBX to YTB?

170°(M) 140°(M) 097°(T) 670 fpm

84 - If an aircraft flies along a VOR radial it will follow a: Rhumbline track Great circle track Constant magnetic track 140°

85 - Ignoring pulse length and fly-back, a radar facility designed to have a maximum unambiguous range of 50 km will have a PRF (pulses per second) of: 167 6000 330 At the approach end about 150 m to one side of the runway and 300 m from touchdown

86 - Erratic indications may be experienced when flying towards a basic VOR/DME-based Area Navigation System 'Phantom Station': When in the cone of silence overhead the Phantom Station Because, under adverse conditions (relative bearing to the Phantom Station other than 180°/360°) it takes the computer more time to calculate the necessary information When the Phantom Station is out of range Coastal refraction.

87 - You are on a magnetic heading of 055° and your ADF indicates a relative bearing of 325°. The QDM is: 200° 235° 055° 020°

88 - Which of the following geometric satellite constellations provides the most accurate NAVSTAR/GPS position fix? 3 satellites with an azimuth of 120° from each other and an elevation of 45° above the horizon 4 satellites with an azimuth of 90° from each other and a low elevation above the horizon 3 satellites with a low elevation above the horizon and an azimuth of 120° from each other together with a fourth directly overhead Main control station, the monitoring station and the ground antennas

89 - Which of the figures depicts an Electronic Flight Instrument System (EFIS) display in FULL VOR/ILS mode with an VOR frequency selected?

Figure 1 Figure 6 Figure 5 Radio communication failure

90 - What information may be displayed on an ATC radar screen connected only to a primary radar system? Aircraft position and SSR code. Aircraft position, SSR code and altitude. Aircraft position only. Aircraft altitude.

91 - What wind velocity is indicated?

105°(M)/20KT 285°(M)/20KT 255°(M)/20KT 7500

92 - Which of the following is correct regarding the range of an NDB? Aircraft height is not limiting for the reception of signals from the N The transmitter power of the NDB station has no effect on the range. The range of an NDB will most likely increase at day time compared to night time. The range is limited to the line of sight.

93 - The amplitude modulation and the colour of an outer marker (OM) is: 3000 Hz, blue 400 Hz, blue 400 Hz, amber DME callsign was not transmitted, the distance information is sufficient proof of correct operation

94 - In the NAVSTAR/GPS satellite navigation system, receiver clock error: Is the biggest part of the total error It cannot be corrected Can be minimised by synchronisation of the receiver clock with the satellite clocks Is corrected by using signals from four satellites

95 - During a flight at FL 210, a pilot does not receive any DME distance indication from a DME station located approximately 220 NM away.The reason for this is that the: Aeroplane is below the 'line of sight' altitude Range of a DME system is always less than 200 NM Altitude is too high 17 NM

96 - Given:Aircraft heading 160°(M),Aircraft is on radial 240° from a VOR, Selected course on HSI is 250°.The HSI indications are deviation bar: Behind the aeroplane symbol with the FROM flag showing Ahead of the aeroplane symbol with the TO flag showing Ahead of the aeroplane symbol with the FROM flag showing 360°

97 - The diagram indicates that the aircraft is to the:

Left of the localizer and below the glidepath Right of the localizer and above the glidepath Left of the localizer and above the glidepath The frequencies employed are too high to give returns from moisture sources

98 - In the Flight Management Computer (FMC) of the Flight Management System (FMS), data relating to flight plans is stored in the: Performance database Air data database Auto flight database Height based on QFE

99 - The maximum range obtainable from an ATC Long Range Surveillance Radar is approximately: 200-300 NM 300-400 NM 50-100 NM 100-200 NM

100 - ICAO Annex 11 defines Area Navigation (RNAV) as a method of navigation which permits aircraft operation on any desired flight path: Outside the coverage of station-referenced navigation aids provided that it is equipped with a minimum of one serviceable self-contained navigation aid Within the coverage of station-referenced navigation aids or within the limits of the capability of self-contained aids, or a combination of these Outside the coverage of station-referenced navigation aids provided that it is equipped with a minimum of two serviceable self-contained navigation aids Simultaneously transmit weather and mapping beams

101 - A VOR is sited at position 58°00'N 073°00'W where the magnetic variation equals 32°W.An aircraft is located at position 56°00'N 073°00'W where the magnetic variation equals 28°W.The aircraft is on VOR radial: 208 212 180 360

102 - An aircraft, at FL 410 is passing overhead a DME station at mean sea level. The DME indicates approximately: 6.8 NM 6.1 km 6.1 NM It is of no use to civil aviation

103 - In a Satellite-Assisted Navigation system (GNSS/GPS) a position line is obtained by: The aircraft's receiver measuring the phase angle of the signal received from a satellite in a known position Timing the period that is taken for a satellite's transmission to reach the aircraft's receiver The aircraft's receiver measuring the time difference between signals received from a minimum number of satellites 200 FT

104 - How many clocks are installed in each NAVSTAR GPS satellite? 3 2 1 Yellow to amber to blue

105 - When flying at 6000 feet above ground level, the DME indicates 5 NM. What is the horizontal distance from the aircraft to overhead the DME? 4.9 NM 4.3 NM 4.6 NM 5.2 NM

106 - An RMI slaved to a remote indicating compass has gone unserviceable and is locked on to a reading of 090°. The tail of the VOR pointer shows 135°. The available information from the VOR is: Radial 135°, relative bearing unknown Radial 315°, relative bearing unknown Radial unknown, relative bearing 045° Local thunderstorm activity

107 - The reason why pre take-off holding areas are sometimes further from the active runway when ILS Category 2 and 3 landing procedures are in progress than during good weather operations is: Heavy precipitation may disturb guidance signals Aircraft manoeuvring near the runway may disturb guidance signals To increase aircraft separation in very reduced visibility conditions 156 NM

108 - In the NAVSTAR/GPS satellite navigation system, what is the maximum time taken to receive the complete set of almanac data from all satellites? 12 hours (= period of the satellites orbit) 25 seconds (= 1 second per data frame) 12.5 minutes (= 30 seconds per data frame) VOR/DME/VORTAC

109 - How does a VOR/DME Area Navigation system obtain DME information? The VOR/DME Area Navigation system uses whatever stations are tuned on the aircraft's normal VHF NAV selector. The pilot tunes the closest VOR/DME stations within range on the VOR/DME Area navigation control panel. The VOR/DME Area Navigation System has its own VHF NAV tuner and it always tunes the DME stations closest to the aircraft position. 1090 +/- 0.3 MHz

110 - Which one of the following is an advantage of a Microwave Landing System (MLS) compared with an Instrument Landing System (ILS)? It does not require a separate azimuth (localiser) and elevation (azimuth) transmitter It is insensitive to geographical site and can be installed at sites where it is not possible to use an ILS There is no restriction on the number of ground installations that can be operated because there is an unlimited number of frequency channels available 190 NM

111 - The selection of code 7500 on an aircraft SSR transponder indicates: Transponder malfunction An emergency Radio communication failure Phase difference between emitted wave and reflected wave

112 - The maximum pulse repetition frequency (PRF) that can be used by a primary radar facility in order to detect targets unambiguously at a range of 50 NM is:(pps = pulses per second) 610 pps 3240 pps 713 pps 330 NM

113 - Which statement is correct with respect to selections on the transponder control panel? The correct ICAO 24 bits aircraft address code must be inserted on the control panel. With the selector knobs the four digits of the squawk can be selected using the decimal symbols 0 through 9. With ALT selected a reply in the modes A, C and S can be transmitted. Range within "line of sight", and maximum of 200 NM

114 - How long does it take a NAVSTAR/GPS satellite to orbit the earth? Approximately 24 hours (one sidereal day) Approximately 12 hours (1/2 of a sidereal day) 365 days because the satellites are located in a geostationary orbit The nearer a receiver is situated to a D-GPS ground station, the more accurate the position fix

115 - An aircraft DME receiver does not lock on to its own transmissions reflected from the ground because: DME transmits twin pulses They are not on the receiver frequency DME uses the UHF band The pulse recurrence rates are varied

116 - The theoretical maximum range for an Airborne Weather Radar is determined by the: Beamwidth Pulse length Pulse recurrence frequency Carrier wave frequency

117 - Instrument Landing Systems (ILS) Glide Paths provide azimuth coverage (i) ..... ° each side ofthe localiser centre-line to a distance of (ii) .... NM minimum from the threshold. (i) 8 (ii) 10 (i) 5 (ii) 8 (i) 35 (ii) 25 550 FT/MIN

118 - When Mode C is selected on the aircraft SSR transponder the additional information transmitted is: Altitude based on regional QNH Aircraft height based on sub-scale setting Flight level based on 1013.25 hPa Simultaneously transmit weather and mapping beams

119 - An aircraft is flying on a heading of 270°(M). The VOR OBS is also set to 270° with the full left deflection and FROM flag displayed.In which sector is the aircraft from the VOR ground station? NW NE SE 156 NM

120 - At what approximate height above the WGS-84 ellipsoid are NAVSTAR/GPS satellites circling the earth? 10900 km 20200 km 19500 km 18

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