Introduction / Context:
Runway numbers are derived from the magnetic bearing of the runway centerline, rounded to the nearest 10 degrees and expressed as a two-digit number (with a leading zero for 01–09). Understanding this convention is essential for aerodrome operations and navigation.
Given Data / Assumptions:
- Magnetic bearing at threshold = 290°.
- Runway designation uses bearing/10, rounded to nearest integer.
- Compass headings are magnetic, not true, unless otherwise stated.
Concept / Approach:
The rule is: runway number N = round(bearing / 10). The result is written as a two-digit integer without the degree symbol. The reciprocal runway differs by 18 (180°), e.g., 29 ↔ 11.
Step-by-Step Solution:
Compute N = round(290 / 10) = round(29.0) = 29.Express as two digits with no degree sign: “Runway 29”.The opposite end would be 110° → “Runway 11”.
Verification / Alternative check:
Check standard ICAO/FAA runway numbering examples: 074° → 07; 226° → 23; thus 290° → 29 is consistent.
Why Other Options Are Wrong:
b: “290” is not a valid runway number; only two digits are used.c: The degree symbol is not used in runway designators.d: Cardinal/quarter-wind notation is not how runways are labeled.e: 290° does not round to 30; that would require ≥ 295°.
Common Pitfalls:
Forgetting to round to the nearest 10°; adding the degree symbol; using true instead of magnetic bearing.
Final Answer:
Runway 29
Discussion & Comments