In view of the requirements the Czech Republic must meet so as to comply
with Navigation Strategies of ECAC countries, and in view of the obligation to
provide as of the agreed dates for area navigation (RNAV) in the Czech
Republic’s airspace the number of digital distance measuring equipment (DME)
must be supplemented by new localities, which will provide for necessary
coverage at airports and Terminal Control Area (TMA), and for route navigation
in the Central Terminal Area (CTA).
Generally we can state that for the route
navigation in the CTA the requirement for full coverage of B-RNAV (basic area
of navigation) above the minimum flight level is a general objective, which
should be fulfilled as soon as possible. For P-RNAV (specific area) in TMA with
heavy traffic the requirement for DME coverage is expected already beginning
2005, for RNP-RNAV (prescribed area) the full coverage is expected after the
However, the respective navigation infrastructure cannot be built in a short
time interval and its preparation must be divided into the next few years.
Supplementing of DME must be preceded by careful assessment.
For the application of P-RNAV and later RNP-RNAV for TMA needs the
number of DMA must be also supplemented, however, their positions have not yet
been specified. Besides calculations and flight verifications this process will
also require mobile DME sets.
Specification of necessary number of DME to secure the required level of
RNAV in TMA at airports and for route navigation shall be carried out by the
Flight Verification Department of the Civil Aviation Authority. For the
verification of accuracy of recommended positions it will use the so-called
mobile DME prepared by ANS CR, s.e. The respective localities will be selected
based on the combination of mathematical calculations and flight measurements
and a schedule of their furnishing with new DME will be stipulated. After the
stipulation of necessary number of DME their building will be included in
updated Medium-Term Development Plan of Air Navigation Services of ANS CR,
s.e., and allocation of respective new frequencies shall be applied for.
The so-called mobile DME, which will serve the above-mentioned purpose,
consists of the following components:
DME 435 Thales,
FAN 96 Thales antennae system,
Antennae pole with attachment to FORD automobile,
Standby supply HONDA electric centre.