Navigation and Route Planning Flashcards
7 cards from real ADX practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Navigation and Route Planning flashcards as text
What is a 'Great Circle Route' and why is it preferred for long-distance flight planning?
Answer: The shortest path between two points on the Earth's surface, which reduces distance and fuel burn on long overwater or transcontinental flights
Great circle routes represent the shortest distance on a sphere and are used in long-haul planning to minimize fuel and flight time.
A dispatcher is planning an ETOPS flight. One purpose of the ETOPS planning process is to identify adequate airports within what parameter?
Answer: Within the authorized diversion time threshold (e.g., 120, 180 minutes) based on the aircraft's one-engine-inoperative speed and ETOPS rating
ETOPS planning requires identifying suitable airports within the operator's authorized diversion time (e.g., 120 or 180 minutes) at approved single-engine speed.
What navigation system relies on the time difference of radio signal reception from multiple ground stations to determine aircraft position?
Answer: LORAN-C
LORAN-C (Long Range Navigation) uses hyperbolic positioning based on the time difference of signals received from a chain of ground transmitters.
When a dispatcher reviews a Preferred IFR Route, what primary benefit does using that route provide?
Answer: It reduces coordination workload for ATC and increases the likelihood of receiving the filed routing without amendment
Preferred IFR routes are established by ATC to manage traffic flow efficiently; filing them increases clearance conformity and reduces ATC reroutes.
Which of the following best describes the function of Area Navigation (RNAV) in modern route planning?
Answer: It allows aircraft to fly any desired path within the coverage of referenced navigation aids or onboard self-contained systems, without flying directly over ground stations
RNAV allows flexible routing by computing positions from multiple nav sources, freeing aircraft from the constraint of flying directly over ground-based stations.
A dispatcher reviews the route and finds a segment with a published Minimum Reception Altitude (MRA). What does this mean operationally?
Answer: The aircraft must be at or above the MRA to receive navigational signals from the fix that defines that route segment
An MRA is the lowest altitude at which an aircraft can receive an adequate signal from an off-route NAVAID used to identify a fix on the airway.
What does the 'T' symbol (or 'T' route) designate in the US NAS, and at what altitudes do these routes typically apply?
Answer: RNAV routes (T-routes) within the low enroute structure, generally from 1,200 ft AGL up to but not including 18,000 ft MSL
T-routes are RNAV routes in the low-altitude enroute structure (below 18,000 ft MSL), providing additional routing options for RNAV-equipped aircraft.