Avionics Questions and Answers – Satellite Landing System

This set of Avionics Multiple Choice Questions & Answers (MCQs) focuses on “Satellite Landing System”.

1. Which of the following is not a reason for not using the basic GPS for landing systems?
a) Accuracy
b) Integrity
c) Availability of satellites
d) Number of users
View Answer

Answer: d
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. Which of the following is supplemented with GPS to provide non-precision and Category I approaches?
a) Primary radar
b) WAAS
c) ILS
d) MLS
View Answer

Answer: b
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. 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
View Answer

Answer: c
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.
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4. 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
c) Transponder
d) DME station
View Answer

Answer: a
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. 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
View Answer

Answer: c
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.
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6. The DME station can supply integrity warnings.
a) True
b) False
View Answer

Answer: b
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. The accuracy of the SPS code solution is satisfactory for precision approaches.
a) True
b) False
View Answer

Answer: b
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.
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8. The pilot has no other option than to use FLOLS to land the aircraft.
a) True
b) False
View Answer

Answer: b
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.

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To practice all areas of Avionics, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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