Avionics MCQs – Satellite Landing System
1 - Question
Which of the following is not a reason for not using the basic GPS for landing systems?
c) Availability of satellites
d) Number of users
Explanation: The primary reason for not using basic GPS for landing systems is because does not provide the accuracy that is required for landing, it lacks a monitoring system and the availability of a sufficient number of satellites to provide location information.
2 - Question
Which of the following is supplemented with GPS to provide non-precision and Category I approaches?
a) Primary radar
Explanation: For non-precision and Category I precision approaches, the limitations by the GPS is mitigated by the FAA’s Wide Area Augmentation System. It may be supplemented with local differential GPS stations located near runways.
3 - Question
Which of the following is not true with respect to WAAS?
a) Provides WADGPS corrections
b) Uses ground integrity broadcast
c) Provide precision approaches for Category III C
d) Provide GPS ranging function
Explanation: WAAS addresses the limitations by providing Wide area differential GPS error correction, a ground integrity broadcast, and a GPS ranging function from three or four geostationary satellites providing additional availability.
4 - Question
Which of the following is required to support Category II and III with DGPS?
a) High- integrity ground to air data link
b) ILS system
d) DME station
Explanation: To support Category II and III landing operations, the additional requirement for accuracy and monitor-response times can be achieved with a differential GPD reference station and a high-integrity ground to air data link located near the runway.
5 - Question
Which of the following errors are not rectified by LDGPS?
a) Satellite ephemerides
b) Ionosphere propagation effects
c) Multi-path signal interference
d) Clock offset
Explanation: LDGPS operation leads to the nearly complete cancellation of errors due to satellite ephemerides, clock offset, selective availability, and ionospheric propagation, leaving mainly those errors due to multipath signal interference and receiver noise.
6 - Question
The DME station can supply integrity warnings.
Explanation: The runway reference station can supply integrity warnings within the required response time of 1 to 2 sec. These are located near the runway.
7 - Question
The accuracy of the SPS code solution is satisfactory for precision approaches.
Explanation: GPS receivers were capable of about ten solutions per second, which is sufficient for coupled flight. The accuracy of the SPS code solution without augmentation is satisfactory for nonprecision approaches.
8 - Question
The pilot has no other option than to use FLOLS to land the aircraft.
Explanation: The pilot has the option of coupling the autopilot to the ACLS, flying the aircraft from “needles” controlled by ACLS data, or being talked down by a shipboard controller. A manual carrier landing with ACLS resembles a land based ground controlled approach.