Regulatory references
Portuguese aerodromes are either subject to European regulation and in this case hold a European aerodrome safety certificate (see section AD 1.5) or to national regulation.
Organization of the runway surface condition reporting and the winter service
Aerodrome operators shall fill a runway condition report (RCR), which is a comprehensive standardized report relating to the conditions of the runway surface and their effects on the aircraft landing and take-off performance, described by means of runway conditions code, and report the results to the Air Traffic Services and Aeronautical Information Services when applicable.
At Portuguese aerodromes, only the provisions relating to the presence of water apply, no winter services are available.
GRF is applicable to the following aerodromes:
Surveillance of movement areas
Aerodrome Maintenance and Operational Services are responsible for inspecting, reporting and measuring, as well as maintaining the movement area in satisfactory conditions at the respective airports, according to Aerodrome Manual and Certification Specifications.
Surface condition assessment methods used; operations on specially prepared winter runways
Aerodrome Operators:
To comply with the above procedure, operators should use the Runway Condition Assessment Matrix (simplified).
Runway Condition Assessment Matrix | |||
Assessment Criteria | Downgrade Assessment Criteria | ||
RWYCC | Runway surface description | Aeroplane deceleration or directional control observation | Special air report of Runway braking action |
RWYCC 4, 1 and 0 are not applicable in case of water. | |||
6 | DRY | - | - |
5 | FROST WET (The runway surface is covered by any visible dampness or water upto and including 3 mm depth) | Braking deceleration is normal for the wheel braking effort AND directional control is normal. | GOOD |
4 | - | Braking deceleration OR directional control is between good and medium. | GOOD |
3 | SLIPPERY WET | Braking deceleration is noticeably reduced for the wheel braking effort applied OR directional control is noticeably reduced. | MEDIUM |
2 | More than 3 mm: STANDING WATER | Braking deceleration OR directional control is between medium and poor. | MEDIUM TO POOR |
1 | - | Braking deceleration is significantly reduced for the wheel braking effort applied OR directional control is significantly reduced. | POOR |
0 | - | Braking deceleration is minimal to non-existent for the wheel braking effort applied OR directional control is uncertain. | LESS THAN POOR |
Actions taken to maintain the usability of movement areas
System and means of reporting
The aerodrome operator should disseminate an RCR through the aeronautical information services and air traffic services, when the runway is wholly or partly contaminated by standing water or frost. When the runway is wet, not associated with the presence of standing water, the assessed information should be disseminated using the RCR through the air traffic service.
The cases of runway closure
Whenever the runway is contaminated by snow, slush or ice the runway is closed to operation.
Distribution of information about runway surface conditions
SNOWTAM format
Instructions for the completion of the SNOWTAM format
General
Aeroplane performance calculation section
Item A – Aerodrome location indicator (four-letter location indicator).
Item B – Date and time of assessment (eight-figure date/time group giving time of observation as month, day, hour and minute in UTC).
Item C – Lower runway designator number (nn[L] or nn[C] or nn[R]).
Only one runway designator shall be inserted for each runway and always the lower number.
Item D – Runway condition code for each runway third. Only one digit (0, 1, 2, 3, 4, 5 or 6) is inserted for each runway third, separated by an oblique stroke (n/n/n).
Item E – Per cent coverage for each runway third. When provided, insert 25, 50, 75 or 100 for each runway third, separated by an oblique stroke ([n]nn/[n]nn/[n]nn).
This information shall be provided only when the runway condition for each runway third (Item D) has been reported as other than 6 and there is a condition description for each runway third (Item G) that has been reported other than ‘DRY’. When the conditions are not reported, this shall be signified by the insertion of ‘NR’ for the appropriate runway third(s).
Item F – Depth of loose contaminant for each runway third. When provided, insert in millimetres for each runway third, separated by an oblique stroke (nn/nn/nn or nnn/nnn/nnn).
This information shall only be provided for the following contamination types:
When the conditions are not reported, this shall be signified by the insertion of ‘NR’ for the appropriate runway third(s).
Item G – Condition description for each runway third. Any of the following condition descriptions for each runway third, separated by an oblique stroke, shall be inserted.COMPACTED SNOW
DRY SNOW
DRY SNOW ON TOP OF COMPACTED SNOW
DRY SNOW ON TOP OF ICE
FROST
ICE
SLUSH
STANDING WATER
WATER ON TOP OF COMPACTED SNOW
WET
WET ICE
WET SNOW
WET SNOW ON TOP OF COMPACTED SNOW
WET SNOW ON TOP OF ICE
DRY (only reported when there is no contaminant)
When the conditions are not reported, this shall be signified by the insertion of ‘NR’ for the appropriate runway third(s).
Item H – Width of runway to which the runway condition codes apply. The width in metres if less than the published runway width shall be inserted.
Situational awareness section
Elements in the situational awareness section shall end with a full stop. Elements in the situational awareness section for which no information exists, or where the conditional circumstances for publication are not fulfilled, shall be left out completely.
Item I – Reduced runway length. The applicable runway designator and available length in meters shall be inserted (e.g. RWY nn [L] or nn [C] or nn [R] REDUCED TO [n]nnn). This information is conditional when a NOTAM has been published with a new set of declared distances.
Item J – Drifting snow on the runway. When reported, ‘DRIFTING SNOW’ shall be inserted.
Item K – Loose sand on the runway. When loose sand is reported on the runway, the lower runway designator shall be inserted with a space ‘LOOSE SAND’ (RWY nn or RWY nn[L] or nn[C] or nn[R] LOOSE SAND).
Item L – Chemical treatment on the runway. When chemical treatment has been reported applied, the lower runway designator shall be inserted with a space ‘CHEMICALLY TREATED’ (RWY nn or RWY nn[L] or nn[C] or nn[R] CHEMICALLY TREATED).
Item M – Snow banks on the runway. When snow banks are reported present on the runway, the lower runway designator shall be inserted with a space ‘SNOWBANK’ and with a space left ‘L’ or right ‘R’ or both sides ‘LR’, followed by the distance in metres from centre line separated by a space ‘FM CL’ (RWY nn or RWY nn[L] or nn[C] or nn[R] SNOWBANK Lnn or Rnn or LRnn FM CL).
Item N – Snow banks on a taxiway. When snow banks are present on a taxiway, the taxiway designator shall be inserted with a space ‘SNOWBANK’ and with a space left ‘L’ or right ‘R’ or both sides ‘LR’, followed by the distance in metres from centre line separated by a space FM CL (TWY [nn]n SNOWBANK Lnn or Rnn or LRnn FM CL).
Item O – Snow banks adjacent to the runway. When snow banks are reported present, penetrating the height profile in the aerodrome snow plan, the lower runway designator and ‘ADJ SNOWBANKS’ shall be inserted (RWY nn or RWY nn[L] or nn[C] or nn[R] ADJ SNOWBANKS).
Item P – Taxiway conditions. When taxiway conditions are reported slippery or poor, the taxiway designator followed by a space ‘POOR’ shall be inserted (TWY [n or nn] POOR or ALL TWYS POOR).
Item R – Apron conditions. When apron conditions are reported slippery or poor, the apron designator followed by a space ‘POOR’ shall be inserted (APRON [nnnn] POOR or ALL APRONS POOR).
Item S – (NR) Not reported. This shall only be reported for Member States that have an established programme of runway friction measurement using a Member-State-approved friction measuring device.
Item T – Plain language remarks.