QUALITY COUNTS IN TACHOGRAPH CHARTS The recent report concerning faulty
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batches of production processed charts highlights a particular problem in certain makes of charts.
The tachograph is the most essential part of the instrument and its design, configuration, dimensions, production and quality control should be clearly defined. It is apparent, however, when examining charts that there is a considerable difference in quality, in particular those from vehicles involved in accidents.
The differences relate to wax-coating adhesion, the type of paper used in respect to changes in temperature and humidity, printing concentricity and angular accuracy.
As accident evalutation has become an important source of
cannot be converted. If this the case with a new vehicle then surely the same rule will apply when the vehicle is four years old. If this is so, I believe all manufacturers should print clearly on their literatur( that this vehicle is not suitable for conversion.
This will give the operator the time of purchase some id( of the resale value of the vehi de, and the problems he may have when selling it.
C J Davis,
Managing director, Phoenix Truck & Trailer Equipment, Loughton, Essex.
objective evidence to drivers and operators the overall quail ty of the chart should be continually monitored by the approval authorities.
P L Needham Accident evaluation manager, Lucas Kienzle Instruments, 36 Gravelly Industrial Park, Birmingham.