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KCAA Flight Radio Telephony Operator Licence (FRTOL) study materials
KCAA Flight Radio Telephony Operator Licence (FRTOL) study resources

KCAA Flight Radio Telephony Operator Licence (FRTOL) practice questions

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Question 1Radio telephony operating procedures and phraseology

An aircraft calls you and says "Nairobi Approach, Five Yankee Kilo, request descent." What is the standard readback for a descent clearance to 8,000 feet?

  1. Roger, Five Yankee Kilo
  2. Descending to 8,000 feet, Five Yankee Kilo
  3. Five Yankee Kilo, cleared 8,000 feet
  4. Descend to 8,000 feet, Five Yankee Kilo Correct answer.

Explanation

Level and altitude clearances must be read back in full using the imperative form of the clearance so the controller can verify the instruction was copied correctly. The callsign is appended at the end after the readback content. A bare "roger" never satisfies a readback requirement for a level instruction.

Question 2Radio telephony operating procedures and phraseology

Which phraseology should a pilot use to report that the aircraft has reached the level to which it was cleared?

  1. Maintaining 5,000 feet
  2. Reaching 5,000 feet
  3. Level 5,000 feet Correct answer.
  4. Established 5,000 feet

Explanation

The standard phrase for reporting that an assigned level has been reached and is being maintained is "level" followed by the figure. "Maintaining" is used by ATC when issuing a level instruction, not normally as a pilot's arrival report. "Established" belongs to localiser or approach path reporting.

Question 3Radio telephony operating procedures and phraseology

A controller transmits: "Five Yankee Kilo, squawk 4271." Which reply is correct?

  1. Wilco, Five Yankee Kilo
  2. Squawking 4271, Five Yankee Kilo Correct answer.
  3. Squawk 4271, Five Yankee Kilo
  4. Four two seven one, Five Yankee Kilo

Explanation

SSR code instructions must be read back, and the conventional pilot readback uses the gerund "squawking" followed by the four digits and the callsign. Each digit is spoken individually. A plain "wilco" does not confirm the code and is not an acceptable substitute.

Question 4Radio telephony operating procedures and phraseology

When transmitting a callsign such as "5Y-ABC" on VHF, how should the registration be spoken?

  1. Five Yankee Alpha Bravo Charlie, heavy
  2. Yankee Alpha Bravo Charlie
  3. Five Yankee Alpha Bravo Charlie Correct answer.
  4. Five Yankee Dash Alpha Bravo Charlie

Explanation

Aircraft registrations are spoken using the individual ICAO phonetic alphabet characters, with the nationality prefix digits spoken as numbers. The hyphen is never spoken. The word "heavy" is a wake turbulence suffix for certain aircraft types, not part of the registration.

Question 5Radio telephony operating procedures and phraseology

What does the phrase "say again" mean when used on an aeronautical radio channel?

  1. Speak more slowly
  2. Change to another frequency
  3. Increase transmitter volume
  4. Repeat your entire last transmission Correct answer.

Explanation

"Say again" is the standard request for the previous transmission to be repeated in full. It is distinct from "speak slower" and from requests to change frequency such as "try 121.5". Using the standard phrase avoids confusion on a shared channel.

Question 6Radio telephony operating procedures and phraseology

Which word or phrase indicates that the sender has finished the transmission and expects no reply?

  1. Wilco
  2. Out Correct answer.
  3. Roger
  4. Over

Explanation

"Out" ends a conversation and signals that no response is expected. "Over" invites the other station to reply. "Roger" and "wilco" are acknowledgements of receipt or compliance and do not end the exchange.

Question 7Radio telephony operating procedures and phraseology

A pilot's transmission is blocked by a simultaneous transmission from another aircraft. What is the recommended action?

  1. Switch to the emergency frequency
  2. Wait briefly and then make the call again Correct answer.
  3. Continue the call on the same channel without change
  4. Repeat the call immediately at higher volume

Explanation

When a transmission is blocked, the station should pause briefly so the interfering transmissions can clear, then call again. Immediately retransmitting at higher volume risks further collisions on the channel. Emergency frequencies are reserved for genuine distress or urgency.

Question 8Radio telephony operating procedures and phraseology

How should the time "14:35" be transmitted in a position report?

  1. Two thirty-five p.m.
  2. One four three five hours
  3. Fourteen thirty-five
  4. One four three five Correct answer.

Explanation

Times are transmitted as individual digits in the 24-hour clock, normally to the minute, without the word "hours". Local 12-hour clock references such as p.m. are not used in air-ground communications. The four digits are spoken one by one.

Question 9Radio telephony operating procedures and phraseology

An aircraft reports: "Nairobi Tower, Five Yankee Kilo, holding short of runway 06 at Alpha, ready for departure." What information does this transmission convey?

  1. The aircraft is at the holding point and awaiting a take-off clearance Correct answer.
  2. The aircraft is on the runway and beginning its take-off roll
  3. The aircraft is requesting a taxi clearance to the apron
  4. The aircraft has vacated the runway after landing

Explanation

"Holding short" means the aircraft is stopped at the holding position and has not entered the runway. "Ready for departure" signals that all checks are complete and a take-off clearance is awaited. This is a standard departure readiness report.

Question 10Radio telephony operating procedures and phraseology

A controller says: "Five Yankee Kilo, line up and wait runway 06." What must the pilot do?

  1. Backtrack the runway to the threshold and depart
  2. Enter the runway and begin the take-off roll
  3. Hold short of the runway until further advised
  4. Enter the runway and stop, awaiting take-off clearance Correct answer.

Explanation

"Line up and wait" authorises the aircraft to enter the runway and position for departure but not to begin the take-off roll. A separate take-off clearance is required before applying power. It is not a clearance to hold short, which is the condition before line-up.

Question 11Radio telephony operating procedures and phraseology

An aircraft is instructed: "Five Yankee Kilo, after the departing traffic, cleared for take-off runway 06." How should the pilot treat this clearance?

  1. Take off only after the specified traffic has departed, as the clearance is conditional Correct answer.
  2. Disregard the clearance and request a new one
  3. Take off immediately without regard to the departing traffic
  4. Hold position until the tower repeats the clearance

Explanation

A clearance containing a condition such as "after the departing traffic" remains conditional until the condition is satisfied. The pilot must ensure the preceding traffic has departed before beginning the roll. Conditional clearances must never be accepted as immediate authorisation.

Question 12Radio telephony operating procedures and phraseology

Which transmission correctly requests a radio check and states the readability scale value?

  1. Nairobi Tower, Five Yankee Kilo, reading you five
  2. Nairobi Tower, Five Yankee Kilo, how do you read me
  3. Nairobi Tower, Five Yankee Kilo, radio check 121.9 Correct answer.
  4. Nairobi Tower, Five Yankee Kilo, request radio check on 121.9

Explanation

The standard form for requesting a radio check names the station, the callsign, the phrase "radio check" and the frequency in use. The reply uses the readability scale of one to five. Informal phrasing such as "how do you read me" is not standard RT phraseology.

Question 13Radio telephony operating procedures and phraseology

A pilot reports: "Nairobi Approach, Five Yankee Kilo, maintaining 6,000 feet, heading 240." What does this report confirm?

  1. The aircraft is at 6,000 feet with no heading assigned
  2. The aircraft is climbing to 6,000 feet on a heading of 240
  3. The aircraft is descending to 6,000 feet and turning to 240
  4. The aircraft is level at 6,000 feet and tracking a heading of 240 degrees Correct answer.

Explanation

"Maintaining" confirms the aircraft is level at the stated altitude, and "heading" followed by three digits gives the magnetic heading being flown. The report is a statement of current status, not of an intended climb or descent. It confirms both assigned parameters.

Question 14Radio telephony operating procedures and phraseology

What is the correct phrase for a controller to instruct an aircraft to change to a new frequency?

  1. Change frequency now
  2. Go to 121.3 immediately
  3. Contact Nairobi Control 121.3 Correct answer.
  4. Switch your radio to 121.3

Explanation

The standard instruction names the station to be contacted and the frequency, in the form "contact [unit] [frequency]". The pilot reads back the frequency. Plain-language commands such as "change frequency now" are not standard RT phraseology.

Question 15Radio telephony operating procedures and phraseology

An aircraft transmits: "Mayday, Mayday, Mayday, Five Yankee Kilo, engine failure, 20 miles south of Nairobi, descending." What does the repetition of "mayday" three times signify?

  1. An urgency message concerning safety but no immediate danger
  2. A routine position report
  3. A distress call requiring immediate assistance Correct answer.
  4. A request for a radio check

Explanation

The distress call is "mayday" spoken three times and indicates grave and imminent danger requiring immediate assistance. It has absolute priority over all other transmissions. The urgency call is "pan pan", repeated three times, which is a lesser condition.

Question 16Radio telephony operating procedures and phraseology

A pilot wishes to declare an urgency condition because of a sick passenger who is not in immediate danger. Which call should be used?

  1. Securite, Securite, Securite
  2. Pan pan, Pan pan, Pan pan Correct answer.
  3. Mayday, Mayday, Mayday
  4. Standby, Standby, Standby

Explanation

The urgency call "pan pan", repeated three times, is used for conditions concerning the safety of an aircraft or persons on board that do not require immediate assistance. "Mayday" is reserved for distress, and "securite" announces safety-related messages such as navigational warnings.

Question 17Radio telephony operating procedures and phraseology

During a distress situation, how should the distress message be structured after the distress call?

  1. Callsign, nature of distress, intentions, position, level, fuel remaining Correct answer.
  2. Nature of distress, callsign, frequency, altitude, destination
  3. Callsign, position, level, heading, endurance, number of persons on board
  4. Position, callsign, weather, endurance, number of persons on board

Explanation

After the distress call, the distress message gives the callsign, the nature of the distress, the intentions of the person in command, the position, level or altitude, and any other useful information such as fuel remaining. This order lets rescue coordination begin immediately. The structure is prescribed so that incomplete messages still convey the essentials first.

Question 18Radio telephony operating procedures and phraseology

A controller transmits: "Five Yankee Kilo, traffic two o'clock, five miles, opposite direction, a Cessna 172, 5,500 feet." What does "opposite direction" tell the pilot?

  1. The traffic is converging head-on or nearly head-on Correct answer.
  2. The traffic is crossing from left to right
  3. The traffic is climbing away from the aircraft
  4. The traffic is overtaking from behind

Explanation

In traffic information, "opposite direction" indicates the other aircraft is proceeding towards the receiving aircraft, generally head-on or nearly so. The clock position and distance give the bearing and range. The relative direction phrase supplements the clock position with the traffic's track.

Question 19Radio telephony operating procedures and phraseology

Which readback is required after the instruction "Five Yankee Kilo, descend to and maintain 4,000 feet, cleared ILS approach runway 06"?

  1. Descend to 4,000 feet, cleared ILS runway 06, Five Yankee Kilo Correct answer.
  2. Descending, Five Yankee Kilo
  3. Cleared ILS runway 06, Five Yankee Kilo
  4. Roger, cleared approach, Five Yankee Kilo

Explanation

Both the level instruction and the approach clearance must be read back in full, followed by the callsign. Omitting the altitude leaves the controller unable to confirm the level was copied. The order follows the instruction as issued.

Question 20Radio telephony operating procedures and phraseology

An aircraft is asked to report when established on the ILS localiser. Which transmission satisfies this request?

  1. Five Yankee Kilo, on approach
  2. Five Yankee Kilo, localiser alive
  3. Five Yankee Kilo, established on the localiser Correct answer.
  4. Five Yankee Kilo, runway in sight

Explanation

The requested report is made with the callsign followed by the phrase confirming the specific condition, here "established on the localiser". Reports must match what was requested so the controller knows the aircraft is tracking the correct aid. "Localiser alive" is cockpit shorthand, not standard RT.

Question 21Radio telephony operating procedures and phraseology

A pilot cannot comply with an ATC instruction. What is the correct response?

  1. State "unable" and give the reason if time permits Correct answer.
  2. Read back the instruction and then disregard it
  3. Remain silent and continue as cleared
  4. Request a frequency change to avoid the instruction

Explanation

When an instruction cannot be complied with, the pilot must say "unable" so the controller can issue an alternative. Adding a brief reason helps the controller resolve the situation. Silence or a false readback would leave the controller believing the instruction is being followed.

Question 22Radio telephony operating procedures and phraseology

A controller needs to pass a long clearance to an aircraft. Which technique is correct?

  1. Ask the pilot to copy the clearance after take-off
  2. Break the clearance into segments and obtain acknowledgement of each part Correct answer.
  3. Read the clearance twice in quick succession
  4. Transmit the whole clearance in one continuous burst

Explanation

Long clearances should be broken into manageable segments, with the pilot acknowledging each segment before the next is issued. This reduces the chance of error and allows correction before the clearance is acted upon. A single continuous burst is prone to mishearing and incomplete copying.

Question 23Radio telephony operating procedures and phraseology

A pilot on the ground receives: "Five Yankee Kilo, taxi to holding point Alpha via taxiway Bravo, cross runway 14." Which element of this instruction must be read back?

  1. Only the runway crossing
  2. The taxi routing and the runway crossing Correct answer.
  3. Nothing, because it is a ground instruction
  4. Only the holding point

Explanation

Taxi instructions and any instruction to cross a runway must be read back in full, including the route and the runway to be crossed. Runway crossing clearances are safety-critical and are always read back. Partial readback of only one element is insufficient.

Question 24Radio telephony operating procedures and phraseology

An aircraft is cleared to "hold at Bravo, maintain 7,000 feet, expect further clearance at 14:20". The aircraft reaches Bravo at 14:05 with fuel for 40 minutes of holding. What is the correct interpretation?

  1. The aircraft may descend below 7,000 feet after 14:20 without further clearance
  2. The aircraft must leave the hold at 14:20 regardless of further clearance
  3. The aircraft should proceed to destination if no call is received by 14:20
  4. The aircraft holds at Bravo at 7,000 feet and should plan to receive onward clearance by 14:20 Correct answer.

Explanation

The expect-further-clearance time is the controller's estimate of when onward clearance will be issued, and it allows the pilot to monitor fuel against the holding endurance. It does not authorise leaving the hold, descending, or proceeding without a clearance. The pilot must advise ATC if the endurance becomes critical.

Question 25Radio telephony operating procedures and phraseology

A pilot's transmission is barely readable and the controller replies "Five Yankee Kilo, say again, readability two." What does this tell the pilot?

  1. The controller's receiver is faulty and no action is needed
  2. The signal is barely readable and the previous transmission must be repeated Correct answer.
  3. The aircraft is transmitting on the wrong frequency
  4. The transmission was readable but the content was unclear

Explanation

The readability scale runs from one (unreadable) to five (perfectly readable), so a report of two means the signal is barely readable. "Say again" instructs the pilot to repeat the transmission. The pilot should repeat and, if the problem persists, check the radio or try another frequency.

Question 26Radio telephony operating procedures and phraseology

Which phraseology should a pilot use to tell ATC that the instruction has been understood and will be complied with when no readback content is specified?

  1. Affirm
  2. Wilco Correct answer.
  3. Standby
  4. Roger

Explanation

'Wilco' means 'I understand your message and will comply with it', so it combines understanding with a commitment to act on the instruction. It is the standard ICAO term for accepting an instruction that carries no items requiring a readback. 'Roger' only confirms receipt of the transmission.

Question 27Radio telephony operating procedures and phraseology

A pilot transmits: 'Nairobi Tower, Five Yankee Kilo, request taxi.' Which element is missing from this initial call so that the controller can identify the aircraft type and position?

  1. The ATIS information letter and QNH
  2. The destination aerodrome and cruise level
  3. The pilot's licence number and company name
  4. The aircraft type and position on the aerodrome Correct answer.

Explanation

The standard initial call contains the station addressed, the aircraft identification, the aircraft type and the position on the movement area. A controller needs the type and position to plan taxi routing and to resolve conflicts on the apron. Without them the call is incomplete even though the request itself is clear.

Question 28Radio telephony operating procedures and phraseology

How should the aircraft registration 5Y-ABC normally be spoken on the radio?

  1. Five Yankee Alpha Bravo Charlie Correct answer.
  2. Five Yankee Charlie Bravo Alpha
  3. Five Yankee A B C
  4. Five Yankee Alpha Bravo Charlie, registration

Explanation

Aircraft registrations are spoken using the ICAO phonetic alphabet for each letter, preceded by the registration prefix spoken as a number or word as appropriate. This gives 'Five Yankee Alpha Bravo Charlie'. Spelling letters by their plain names risks confusion with similar-sounding letters.

Question 29Radio telephony operating procedures and phraseology

A controller says: 'Five Yankee Kilo, squawk 4521.' Which reply is correct?

  1. Squawk four five two one, Five Yankee Kilo Correct answer.
  2. Four five two one, wilco, Five Yankee Kilo
  3. Squawk four thousand five hundred and twenty-one, Five Yankee Kilo
  4. Squawking 4521, roger

Explanation

A discrete code must be read back as individual digits, each spoken separately, followed by the aircraft call sign. The word 'squawk' is retained in the readback so the controller can confirm the item being acknowledged. Grouping the digits as a number is incorrect.

Question 30Radio telephony operating procedures and phraseology

An aircraft is instructed: 'Five Yankee Kilo, report passing 5,000 feet.' Which transmission correctly satisfies this instruction?

  1. Five Yankee Kilo, maintaining 5,000 feet
  2. Five Yankee Kilo, leaving 5,000 feet
  3. Five Yankee Kilo, passing 5,000 feet Correct answer.
  4. Five Yankee Kilo, 5,000 feet

Explanation

The instruction asks for a report at the moment the aircraft passes the level, so the reply uses the word 'passing' with the level. 'Passing' confirms the aircraft is at that instant going through 5,000 feet. The call sign is included in every transmission.

Question 31Radio telephony operating procedures and phraseology

A controller issues: 'Five Yankee Kilo, reduce speed to 180 knots.' The pilot wishes to slow to 160 knots instead. Which response is correct?

  1. Five Yankee Kilo, standby, unable
  2. Five Yankee Kilo, roger, reducing speed
  3. Five Yankee Kilo, unable to reduce to 180 knots, request 160 knots Correct answer.
  4. Five Yankee Kilo, negative, reducing to 160 knots

Explanation

When a pilot cannot comply with an instruction, the reply should state 'unable' and, where possible, give the reason or a counter-proposal. This lets the controller plan around the limitation. Simply acting on a different speed without telling ATC creates a conflict risk.

Question 32Radio telephony operating procedures and phraseology

What does the phrase 'expect further clearance at 14:20' mean in a holding instruction?

  1. The aircraft must leave the hold at 14:20 whether or not cleared
  2. The aircraft's slot at the destination is 14:20
  3. The aircraft should plan on receiving its onward clearance at or about 14:20 Correct answer.
  4. The aircraft should contact the controller at 14:20

Explanation

An expect further clearance time tells the aircraft when it may anticipate the next clearance, which allows the crew to manage fuel and holding endurance. It is planning information and does not itself authorise leaving the hold. A separate clearance is still required.

Question 33Radio telephony operating procedures and phraseology

A pilot hears: 'Five Yankee Kilo, taxi via Bravo, hold short of runway 14 at Bravo.' Which readback is correct?

  1. Hold short of runway 14, Five Yankee Kilo
  2. Via Bravo, Five Yankee Kilo, roger
  3. Via Bravo, cross runway 14 at Bravo, Five Yankee Kilo
  4. Via Bravo, hold short of runway 14 at Bravo, Five Yankee Kilo Correct answer.

Explanation

Taxi clearances and hold-short instructions must be read back in full, including the route and the holding point, to prevent runway incursions. The readback repeats the limit of the clearance exactly. Any omission of the hold-short element defeats the safety purpose.

Question 34Radio telephony operating procedures and phraseology

An aircraft on approach is told: 'Five Yankee Kilo, go around.' What is the correct immediate action and transmission?

  1. Apply go-around power and climb, then transmit 'Going around, Five Yankee Kilo' Correct answer.
  2. Transmit 'Standby, Five Yankee Kilo' before deciding
  3. Reduce power and land, then report 'Going around' on the ground
  4. Continue the approach and ask the controller to confirm the instruction

Explanation

A go-around instruction requires immediate execution because it is issued to resolve a safety conflict on or near the runway. The pilot applies go-around power and climbs as cleared, then transmits the acknowledgement. Delaying to query the instruction defeats its purpose.

Question 35Radio telephony operating procedures and phraseology

Which transmission correctly requests a clearance to cross an active runway?

  1. Five Yankee Kilo, request cross runway 06 Correct answer.
  2. Five Yankee Kilo, proceed runway 06
  3. Five Yankee Kilo, crossing runway 06
  4. Five Yankee Kilo, roger cross runway 06

Explanation

A request for a runway crossing is phrased as a request using the word 'request' followed by the specific action and runway designator. This makes clear that no crossing is taking place until a clearance is received. The call sign precedes the request.

Question 36Radio telephony operating procedures and phraseology

A pilot's first call to an approach unit is answered by another aircraft transmitting at the same time, and neither transmission is readable. What should the pilot do?

  1. Repeat the call immediately at higher volume
  2. Assume the controller heard the call and continue
  3. Wait for a suitable interval and repeat the call in full Correct answer.
  4. Change to the emergency frequency and re-establish contact

Explanation

When simultaneous transmissions cause interference, the correct technique is to pause to let the frequency clear and then repeat the call. The pause allows the other station to finish and reduces the chance of a repeat collision. Repeating at once usually recreates the same overlap.

Question 37Radio telephony operating procedures and phraseology

A controller transmits: 'Five Yankee Kilo, descend to 4,000 feet, QNH 1013.' Which readback is correct?

  1. Descend to 4,000 feet, QNH 1013, Five Yankee Kilo Correct answer.
  2. Descending, QNH 1013, roger, Five Yankee Kilo
  3. QNH 1013, Five Yankee Kilo
  4. Descend to 4,000 feet, Five Yankee Kilo

Explanation

Level instructions and altimeter settings must both be read back, since the QNH directly affects the altitude flown. The readback repeats the cleared level and the pressure setting exactly. Omitting the QNH is a common and hazardous error.

Question 38Radio telephony operating procedures and phraseology

An aircraft is instructed: 'Five Yankee Kilo, contact Nairobi Approach 119.7.' Which reply is correct?

  1. Contact Nairobi Approach, Five Yankee Kilo
  2. 119.7, Five Yankee Kilo Correct answer.
  3. Nairobi Approach 119.7, roger, Five Yankee Kilo
  4. 119.7, wilco, Five Yankee Kilo, changing

Explanation

A frequency change instruction is acknowledged by reading back the frequency followed by the aircraft call sign. The frequency is spoken digit by digit, with the decimal point expressed as 'decimal'. The readback lets the controller confirm the correct frequency was copied.

Question 39Radio telephony operating procedures and phraseology

During a distress transmission, the pilot wishes to give the nature of the emergency, the position, and the intentions. Which phrase should introduce the distress message after the distress call?

  1. Pan Pan, Five Yankee Kilo, engine failure, position 20 miles south of Nairobi, requesting diversion
  2. Mayday, Mayday, Five Yankee Kilo, requesting priority for landing
  3. Mayday, Five Yankee Kilo, engine failure, position 20 miles south of Nairobi, intending to divert to Wilson Correct answer.
  4. Securite, Five Yankee Kilo, engine failure, position 20 miles south of Nairobi

Explanation

The distress call 'Mayday' is repeated three times, followed by the call sign; the distress message then begins with 'Mayday' and the call sign before giving the nature of the problem, position, and intentions. This structure lets any listening station understand the situation immediately. The message should be as brief and factual as possible.

Question 40Radio telephony operating procedures and phraseology

A pilot is asked: 'Five Yankee Kilo, confirm your level.' The aircraft is climbing through 6,200 feet to 8,000 feet. Which reply is correct?

  1. Five Yankee Kilo, maintaining 8,000 feet
  2. Five Yankee Kilo, climbing through 6,200 feet to 8,000 feet Correct answer.
  3. Five Yankee Kilo, 6,200 feet
  4. Five Yankee Kilo, level 8,000 feet, climbing

Explanation

A 'confirm your level' query requires the actual level at the time of the transmission, together with the cleared level if the aircraft is not yet level. The reply 'climbing through 6,200 feet to 8,000 feet' gives both facts. Stating only the cleared level would misrepresent the aircraft's position.

Question 41Aeronautical communications equipment and frequency management

In ICAO VHF aeronautical mobile communications, which frequency band is allocated specifically for air-to-ground voice communication?

  1. 118.000 to 136.975 MHz Correct answer.
  2. 960 to 1215 MHz
  3. 225.000 to 399.975 MHz
  4. 108.000 to 117.975 MHz

Explanation

The civil VHF aeronautical band used for air-ground RTF runs from 118.000 to 136.975 MHz, with 25 kHz or 8.33 kHz channel spacing. Frequencies below 118 MHz are used for navigation aids such as VOR and ILS localiser, and the UHF band is reserved for military use.

Question 42Aeronautical communications equipment and frequency management

What is the channel spacing used for VHF aeronautical communications under the 8.33 kHz channel plan?

  1. 50 kHz
  2. 100 kHz
  3. 25 kHz
  4. 8.33 kHz Correct answer.

Explanation

The 8.33 kHz plan divides the VHF band into channels spaced 8.33 kHz apart, tripling the number of available channels compared with the older 25 kHz plan. This was introduced in Europe to relieve congestion in the VHF band.

Question 43Aeronautical communications equipment and frequency management

A pilot selects 121.500 MHz on the VHF radio. What is the primary purpose of this frequency?

  1. Company operational control
  2. Aerodrome ground control
  3. Emergency and distress communications Correct answer.
  4. ATIS broadcasts

Explanation

121.500 MHz is the international aeronautical emergency frequency, monitored for distress and urgency calls. It is not used for routine aerodrome or company communications.

Question 44Aeronautical communications equipment and frequency management

Which unit of measurement is used to express the strength of a radio signal received by an aircraft?

  1. Hectopascals
  2. Readability, in numbers 1 to 5
  3. Signal strength, in numbers 1 to 5 Correct answer.
  4. Knots

Explanation

In radiotelephony signal reports, readability is graded 1 to 5 and signal strength is also graded 1 to 5. Hectopascals measure pressure and knots measure speed, so neither applies to radio signal quality.

Question 45Aeronautical communications equipment and frequency management

The term 'squelch' on a VHF transceiver refers to a circuit that:

  1. Reduces the modulation index
  2. Automatically tunes the antenna
  3. Suppresses receiver audio output when no usable signal is present Correct answer.
  4. Increases transmitter output power

Explanation

The squelch circuit mutes the receiver audio when the received signal falls below a set threshold, so the pilot hears only usable transmissions. It does not affect transmitter power, antenna tuning, or modulation.

Question 46Aeronautical communications equipment and frequency management

Which of the following is the correct ICAO phonetic alphabet word for the letter 'Q'?

  1. Queen
  2. Quincy
  3. Quebec Correct answer.
  4. Quota

Explanation

The ICAO phonetic alphabet word for Q is Quebec. Using non-standard words such as Quincy or Queen risks confusion with other letters, particularly over noisy VHF links.

Question 47Aeronautical communications equipment and frequency management

What does the abbreviation 'RTF' stand for in aeronautical communications?

  1. Radio Transmission Frequency
  2. Remote Transmitter Facility
  3. Receiver Tuning Factor
  4. Radio Telephony Correct answer.

Explanation

RTF stands for radiotelephony, the voice communication between pilots and ground stations over VHF or HF. It is distinct from data link and from navigation signals.

Question 48Aeronautical communications equipment and frequency management

Which of these is a primary function of the antenna in a VHF aircraft radio installation?

  1. Converting electrical energy into radiated electromagnetic waves Correct answer.
  2. Storing the frequency in memory
  3. Providing the DC power supply
  4. Amplifying the audio output to the speaker

Explanation

The antenna converts the transmitter's electrical signal into electromagnetic waves, and when receiving it converts incoming waves back into electrical signals. Memory storage, audio amplification, and power supply are functions of other components.

Question 49Aeronautical communications equipment and frequency management

A pilot wishes to call a ground station on VHF. Which type of propagation allows reliable line-of-sight communication at these frequencies?

  1. Sky-wave propagation
  2. Ducted propagation
  3. Ground-wave propagation
  4. Space-wave (line-of-sight) propagation Correct answer.

Explanation

VHF signals travel essentially in straight lines and are limited by the radio horizon, so communication requires line of sight between the aircraft and the ground station. Sky-wave and ground-wave propagation apply mainly to HF and lower frequencies.

Question 50Aeronautical communications equipment and frequency management

An aircraft is transmitting on 118.100 MHz while the assigned frequency is 118.125 MHz. What is the most likely consequence?

  1. Automatic retuning by the ground station
  2. Improved readability
  3. No effect on communication
  4. Interference to other users and possible loss of communication with the intended station Correct answer.

Explanation

Selecting the wrong channel means the transmission is not heard by the intended ground station and may interfere with other users. Correct frequency selection is fundamental to safe RTF communication.