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aerodrome to which the SNOWTAM refers (see
Location Indicators (Doc 7910));
MMYYGGgg = dateltime of obsewation/measurement,
whereby:
MA4 = month, e.g. January = 01,
December = 12
YY = day of the month
GGgg = time in hours (GG) and
minutes (gg) UTC;
(BBB) = optional group for:
Correction to SNOWTAM message previousIy
disseminated with the same serial number =
COR.
Note.- Brackets in (BBB) are used to indicate
that this group is optional.
Example: Abbreviated heading of SNOWTAM No. 149
from Zurich, measurementlobservation of 7 November at
0620 UTC:
SWLS0149 LSZH 11070620
3) a change in the available length or width of a 2. item A - Aerodrome location indicator (four-letter
runway of 10 per cent or more; location indicator).
4) any change in the type of deposit or extent of 3. Item B - Eight-figure datdtime group - giving time of
coverage which requires reclassification in observation as month, day, hour and minute in UTC; this
Items F or T of the SNOWTAM; item must always be completed.
5) when critical snow banks exist on one or both
sides of the runway, any change in the height or
distance from centre line;
6) any change in the conspicuity of runway lighting
caused by obscuring of the lights;
7) any other conditions known to be significant
according to experience or local circumstances.
e) The abbreviated heading "TTAAiiii CCCC
MMYYGGgg (BBB)" is included to facilitate the
automatic processing of SNOWTAM messages in
computer data banks. The explanation of these
symbols is:
TT = data designator for SNOWTAM = SW;
AA = geographical designator for States, e.g. LF =
FRANCE, EG = United Kingdom (see Location
Indicators (Doc 7910), Part 2, Index to
Nationality Letters for Location Indicators);
iiii = SNOWTAM serial number in a four-figure
group;
4. ltem C - Lower runway designator number.
5. Item D - Cleared runway length in metres, if less than
published length (see Item T on reporting on part of
runway not cleared).
6. ltem E - Cleared runway width in metres, if less than
published width; if offset left or right of centre line, add
"L" or "R", as viewed from the threshold having the
lower runway designation number.
7. Item F - Deposit over total runway length as explained
in SNOWTAM Format. Suitable combinations of these
numbers may be used to indicate varying conditions over
runway segments. If more than one deposit is present on
the same portion of the runway, they should be reported
in sequence from the top to the bottom. Drifts, depths of
deposit appreciably greater than the average values or
other significant characteristics of the deposits may be
reported under Item T in plain language.
Note.- Definitions for the various types of snow are
given at the end of this Appendix.
2511 1/04 APP 2-2
Appendix 2 Annex 15 - Aeronautical Information Services
8. ltem G - Mean depth in millimetres deposit for each
third of total runway length, or "XX if not measurable or
operationally not significant; the assessment to be made to
an accuracy of 20 mm for dry snow, 10 mm for wet snow
and 3 mm for slush.
9. ltem H - Friction measurements on each third of the runway
and friction measuring device. Measured or calculated
coefficient (two digits) or, if not available, estimated
surface friction (single digit) in the order from the threshold
having the lower runway designation number. Insert a
code9 when surface conditions or available friction
measuring device do not permit a reliable surface friction
measurement to be made. Use the following abbreviations
to indicate the type of friction measuring device used:
BRD
GRTMUM
RFT
SFH
SFL
SKH
SKL
TAP
Brakemeter-Dynometer
Grip tester
Mu-meter
Runway friction tester
Surface friction tester (high-pressure tire)
Surface friction tester (low-pressure tire)
Skiddometer (high-pressure tire)
Skiddometer (low-pressure tire)
Tapley meter
If other equipment is used, specify in plain language.
10. ltem J - Critical snowbanks. If present insert height in
centimetres and distance from edge of runway in metres,
followed by left ("L") or right ("R) side or both sides
("LR), as viewed from the threshold having the lower.
runway designation number.
11. ltem K - If runway lights are obscured, insert "YES"
followed by "L", " R or both "LR, as viewed from the
threshold having the lower runway designation number.
12. ltem L - When further clearance will be undertaken,
　
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