ATSEP BASIC ATC FINAL SCRIPT PAPER
2026 VERIFIED SOLUTIONS FULL CONTENT
◉ What surveillance technique is ADS-B?
Answer: Cooperative, dependent surveillance
◉ What is an example of Cooperative, Independent surveillance?
Answer: SSR radar
◉ How is an aircraft detected by the PSR?
Answer: By reflected electromagnetic energy transmitted from the
radar
◉ What is radar clutter on an ATM radar?
Answer: Unwanted targets
◉ What is a limitation to the PSR radar?
Answer: No identification of received echoes
◉ What is meant by PRI?
,Answer: Pulse repetition interval
◉ What is the purpose of the duplexer?
Answer: To alternately switch the antenna between receiving and
transmitting
◉ What is the operating principle of the aircraft transponder?
Answer: To code a reply on the 1090MHz frequency in response to a
SSR radar interrogation
◉ What is transmitted on a Mode C reply from a transponder?
Answer: Pressure altitude
◉ What is it called when replies from 2 aircraft overlap causing
errors in extracting the included data?
Answer: Garbling
◉ What is a disadvantage of the classical SSR radar?
Answer: Garbling can occur if 2 aircraft are close in slant range and
on the same bearing
◉ What is a feature of Mode S?
Answer: Selective interrogations to reduce FRUIT
, ◉ What is provided with Mode S enhanced surveillance?
Answer: Downlinked aircraft parameters
◉ What is a feature of the Monopulse SSR radar?
Answer: Improved azimuth resolution and fewer pulses needed to
determine position
◉ ADS (automatic dependent surveillance) is a surveillance
technique for use by ATS in which:
Answer: Aircraft automatically provide, via data link, data from on-
board navigation systems
◉ What is a feature of ADS-B?
Answer: High update rate and simple, omnidirectional receivers
◉ Which airborne equipment supports the 1090ES messages?
Answer: The Mode S transponder
◉ What is the dominant ADS-B data link technology in Europe?
Answer: 1090 extended squitter
2026 VERIFIED SOLUTIONS FULL CONTENT
◉ What surveillance technique is ADS-B?
Answer: Cooperative, dependent surveillance
◉ What is an example of Cooperative, Independent surveillance?
Answer: SSR radar
◉ How is an aircraft detected by the PSR?
Answer: By reflected electromagnetic energy transmitted from the
radar
◉ What is radar clutter on an ATM radar?
Answer: Unwanted targets
◉ What is a limitation to the PSR radar?
Answer: No identification of received echoes
◉ What is meant by PRI?
,Answer: Pulse repetition interval
◉ What is the purpose of the duplexer?
Answer: To alternately switch the antenna between receiving and
transmitting
◉ What is the operating principle of the aircraft transponder?
Answer: To code a reply on the 1090MHz frequency in response to a
SSR radar interrogation
◉ What is transmitted on a Mode C reply from a transponder?
Answer: Pressure altitude
◉ What is it called when replies from 2 aircraft overlap causing
errors in extracting the included data?
Answer: Garbling
◉ What is a disadvantage of the classical SSR radar?
Answer: Garbling can occur if 2 aircraft are close in slant range and
on the same bearing
◉ What is a feature of Mode S?
Answer: Selective interrogations to reduce FRUIT
, ◉ What is provided with Mode S enhanced surveillance?
Answer: Downlinked aircraft parameters
◉ What is a feature of the Monopulse SSR radar?
Answer: Improved azimuth resolution and fewer pulses needed to
determine position
◉ ADS (automatic dependent surveillance) is a surveillance
technique for use by ATS in which:
Answer: Aircraft automatically provide, via data link, data from on-
board navigation systems
◉ What is a feature of ADS-B?
Answer: High update rate and simple, omnidirectional receivers
◉ Which airborne equipment supports the 1090ES messages?
Answer: The Mode S transponder
◉ What is the dominant ADS-B data link technology in Europe?
Answer: 1090 extended squitter
