Brunei DCA CPL(A) Radio Navigation study guide
Brunei DCA CPL(A) Radio Navigation · Work through your exam, one topic at a time.
Radio navigation is one of the ground-school subjects a candidate must pass to hold a Commercial Pilot Licence (Aeroplane) issued by Brunei's Department of Civil Aviation. It sits alongside air law, meteorology, navigation, human performance and the technical subjects, and it exists to prove that you understand the systems you will actually fly behind rather than merely the buttons on a panel. The Brunei DCA CPL(A) Radio Navigation study guide has 9 sections and about 3,106 words.
01Radio Wave Fundamentals and Propagation
Radio navigation depends on four linked ideas: frequency and wavelength, the modes of propagation, the behaviour of the ionosphere, and the practical consequences of power and path loss. Wavelength equals the speed of light divided by frequency, so a 300 kHz NDB signal has a wavelength of about 1000 m while a 1 GHz GNSS signal has a wavelength of about 30 cm.
348 words, about 2 min02VOR, DME and TACAN
VOR gives magnetic bearing from the station (the radial), measured as the phase difference between a rotating or electronically variable signal and a reference signal. The aircraft receiver derives the radial, and the CDI centres when the selected OBS matches the radial.
359 words, about 2 min03NDB and ADF
An NDB transmits in the LF/MF band, typically 190–1750 kHz, and the ADF receiver derives a relative bearing to the station using a directional antenna (loop or sense antenna combination). The magnetic bearing to the station equals the aircraft magnetic heading plus the relative bearing.
294 words, about 1 min04ILS and Approach Guidance
ILS comprises a localiser for azimuth, a glide path for vertical guidance, and marker beacons or DME for range. The localiser transmits on VHF (108–112 MHz) with a 90 Hz/150 Hz modulation difference that drives the deviation indicator; full-scale deflection is typically 2.5° each side, narrowing to about 0.45° at the threshold.
338 words, about 2 min05Radar Systems: Primary, Secondary and Airborne Weather Radar
Primary radar detects returns from targets using pulse timing to give range and antenna direction to give bearing; it needs no cooperation from the target. Secondary surveillance radar interrogates a transponder, which replies with identity (Mode A), pressure altitude (Mode C) or, in Mode S, a unique address and data.
301 words, about 2 min06Area Navigation
Area navigation (RNAV) allows an aircraft to fly any desired path within the coverage of navigation aids, rather than tracking directly to or from a station. The system computes position from multiple inputs (VOR/DME, DME/DME, GNSS, inertial) and then guides along a defined route of waypoints.
308 words, about 2 min07GNSS and Performance-Based Navigation
GNSS position is derived from ranging measurements to satellites; position accuracy depends on satellite geometry, expressed as dilution of precision. GPS, GLONASS, Galileo and BeiDou are constellations; augmentation improves integrity.
288 words, about 1 min08Ground-Based and Satellite-Based Augmentation Systems
Augmentation improves GNSS accuracy, integrity and availability. Ground-based augmentation (GBAS) uses a ground station to compute corrections and integrity parameters for a local area, broadcasting them to aircraft on VHF; it supports precision approach (GLS).
275 words, about 1 min09Radio Navigation Instrument Interpretation and Practical Use
A candidate must be fluent in reading the CDI, HSI, RMI, ADF card and DME display, and in converting between the various presentations. The CDI shows deviation from the selected course, with TO/FROM sensing; the HSI combines heading and course; the RMI shows magnetic bearing directly.
595 words, about 3 min