CPL Navigation and Radio Aids 3

Question 1

What does RAIM stand for and what does it do?

Accepted Answer

Receiver Autonomous Integrity Monitoring; detects faulty GPS satellite signals using redundant satellite data

Answer

RAIM (Receiver Autonomous Integrity Monitoring) compares signals from multiple GPS satellites to detect when one is transmitting erroneous data.

Question 2

On an RNAV (GPS) approach chart, 'LNAV' minima provide:

Accepted Answer

Lateral guidance only, flown to a minimum descent altitude (MDA)

Answer

LNAV (Lateral Navigation) provides horizontal course guidance only; it is a non-precision approach flown to an MDA.

Question 3

During the en route phase of flight, GPS CDI full-scale deflection represents:

Accepted Answer

±5.0 NM

Answer

En route GPS CDI sensitivity is ±5 NM full scale, narrowing to ±1 NM in the terminal phase and ±0.3 NM on final approach.

Question 4

The primary advantage of WAAS (Wide Area Augmentation System) for GPS approaches is:

Accepted Answer

It provides glideslope-equivalent vertical guidance (LPV) without a ground-based transmitter

Answer

WAAS provides differential correction signals via geostationary satellites, enabling LPV approaches with vertical guidance comparable to ILS without a glideslope transmitter.

Question 5

A Required Navigation Performance (RNP) value of 0.3 means the navigation system must:

Accepted Answer

Keep the aircraft within 0.3 NM of the intended path for at least 95% of flight time, with onboard alerting

Answer

RNP 0.3 requires the total system error to remain within 0.3 NM of the intended track 95% of the time, with an onboard performance monitoring and alerting capability.

(CPL) Commercial Pilot Licence Practice Test

(CPL) Commercial Pilot Licence Practice Test

CPL Navigation and Radio Aids 3