CAP 413
Radiotelephony Manual
Chapter 6 Page 29
1.17.6.6 Where primary radar is unavailable, and SSR alone is used to provide an ATS, non-
transponding aircraft will not be detected. An SSR only service may be provided only
if approved by the relevant authority.
1.17.6.7 Where the radar display is affected by clutter, the controller shall advise the pilot of
the reduction in traffic information.
1.17.7
Traffic Service – Operations below ATC Terrain Safety Levels
1.17.7.1 If a pilot receiving a Traffic Service requests a heading from the controller whilst
operating below the ATC unit terrain safe level, this may be provided as long as the
controller reminds the pilot that they remain responsible for terrain clearance.
1.17.7.2 Other than when following a notified instrument flight procedure, a pilot requesting
to descend below the ATC unit terrain safe level under a Traffic Service shall be
reminded that he remains responsible for terrain clearance.
1.17.7.3 When providing a Traffic Service, levels allocated by controllers shall be terrain safe
in accordance with ATC unit terrain safe levels, unless an agreement is reached with
the pilot or such levels form part of VFR clearances for aerodrome arrival or to enter
controlled airspace that by necessity require flight below the ATC unit terrain safe
levels. In such circumstances, the instruction shall be accompanied by a reminder that
the pilot remains responsible for terrain clearance.
G-CD, reduced traffic information,
SSR only
G-CD, reduced traffic information
from the left for the next 10 miles
due displayed clutter
G-CD, request a heading for Seaton
G-CD, taking your own terrain
clearance, suggest right heading
120 degrees
My own terrain clearance, right
heading 120 degrees, G-CD
G-CD, request descent to altitude
1000 feet
G-CD, taking your own terrain
clearance, descent approved
My own terrain clearance, descent
approved, G-CD
G-CD, for co-ordination can you
accept flight at altitude 1500 feet
Affirm, G-CD
G-CD, taking your own terrain
clearance, report level altitude 1500
feet
My own terrain clearance, report
level altitude 1500 feet, G-CD
17 November 2011
Summary of Contents for 413
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