Based on the following SNOWTAMs, what is true about the runway contamination and braking action at 02:25 UTC?
11300200 04L 5/5/5 75/100/75 NR/03/03 WET/SLUSH/WET SNOW
11300225 04R 5/3/2 100/50/75 NR/06/06 WET/SLUSH/SLUSH
Refer to figure.
- 11300200 04L 5/5/5 75/100/75 NR/03/03 WET/SLUSH/WET SNOW ⇒ SNOWTAM issued 02:00 UTC
- 11300225 04R 5/3/2 100/50/75 NR/06/06 WET/SLUSH/SLUSH ⇒ SNOWTAM issued 02:25 UTC
The question asks about the conditions at 02:25 UTC, which is 11300225 04R 5/3/2 100/50/75 NR/06/06 WET/SLUSH/SLUSH. Let's analyze each element:
- 11300225 → SNOWTAM issued at 30th of the month (1130) at 02:25 UTC
- 04R → For runway 04R
- 5/3/2 → The first third of the runway has good surface friction (5), the second third of the runway has medium surface friction (3) and the last third of the runway has medium to poor surface friction (2).
- 100/50/75 → The first third of the runway has an extent of contaminant of 100%, the second third 50% and the last third of the runway 75%.
- NR/06/06 → For the first third of the runway depth of deposit is not reported (NR), at the second third of the runway it is 6mm and at the last third of the runway it is 6mm.
- WET/SLUSH/SLUSH → The first third of the runway is wet, on the second third of the runway there is slush and on the last third of the runway there is slush.
ICAO Annex 15
Appendix 2. Snowtam Format
9. Item H - Estimated surface friction on each third of the runway (single digit) in the order from the threshold having the lower runway designation number.
The values for each third of the runway are separated by an oblique stroke (/), without space between the values and the oblique stroke-, for example: 5/5/5.
| Code | Estimated Surface Friction |
| 5 | Good |
| 4 | Medium / Good |
| 3 | Medium |
| 2 | Medium / Poor |
| 1 | Poor |
| 9 | Unreliable |
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