CAP 413, Manual

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CAP 413 Radiotelephony Manual
Chapter 4 Page 44
7.3.7 Where instrumented runway visual range (IRVR) observations are available, more
than one reading may be transmitted.
7.3.8 Controllers shall append 'check your minima' to the first provision of RVR values at or
below 1,000 m to pilots of inbound aircraft making an instrument approach, except:
a) for precision approaches to runways that are capable of Cat II/III operations;
b) when aircraft are already established on final approach.
NOTE 1: Where IRVR systems are employed, the touchdown value is used to trigger
the above procedure. Transmissometer unserviceability and the impact on
ATC procedures are detailed in CAP 493 Manual of Air Traffic Services
Part 1, Section 3, Chapter 3, paragraph 3.5.
NOTE 2: When considered appropriate, ATC units may specify higher RVR values in
their local Manual of Air Traffic Services Part 2 for the initiation of this
procedure.
7.4 Runway Surface Conditions
7.4.1 When conditions of standing water, with or without reports of braking action, are
brought to the attention of ATS, the available information will be passed to aircraft
likely to be affected.
7.4.2 When reports are based on inspections of the runway surface made by the
aerodrome authority, the presence or otherwise of surface water on a runway will be
assessed over the most significant portion of the runway (i.e., the area most likely to
be used by aircraft taking off and landing).
NOTE: This area may differ slightly from one runway to another but will approximate
to the central two-thirds of the width of the runway extending longitudinally
from a point 100 m before the aiming point to 100 m beyond the aiming point
for the reciprocal runway.
7.4.3 The presence or otherwise of surface water on a runway is reported in RTF and ATIS
broadcasts using the following descriptions:
BIGJET 347, RVR runway 27, 650
600 600 metres
BIGJET 347
BIGJET 347, RVR runway 27,
touchdown not available, mid point
650, stop end 550 metres
BIGJET 347
BIGJET 347, RVR runway 27, 650
600 600 metres, check your minima
BIGJET 347 wilco
Table 5
Reporting Term Surface conditions
DRY The surface is not affected by water, slush, snow, or ice.
NOTE: Reports that the runway is dry are not normally to be passed
to pilots. If no runway surface report is passed, pilots should assume
the surface to be dry.
17 November 2011