ATSEP BASIC EXAMINATION SET 2026
ACCURATE ANSWERS ALREADY PASSED
⩥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
⩥What is the purpose of Mode S Short squitter? Answer: ACAS/TCAS
interrogations
⩥What is variation? Answer: The difference between true and magnetic
north
⩥What is meant by instrument flight rules? Answer: Flying by reference
to instruments in the flight deck, and navigation is accomplished by
reference to electronic signals
⩥What is the most common geodetic reference system with global
coverage? Answer: WGS 84
ACCURATE ANSWERS ALREADY PASSED
⩥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
⩥What is the purpose of Mode S Short squitter? Answer: ACAS/TCAS
interrogations
⩥What is variation? Answer: The difference between true and magnetic
north
⩥What is meant by instrument flight rules? Answer: Flying by reference
to instruments in the flight deck, and navigation is accomplished by
reference to electronic signals
⩥What is the most common geodetic reference system with global
coverage? Answer: WGS 84
