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knowledge gained from experience, the
accomplishment of special actions should be normal or
be prescribed.
Conclusions
The investigation has revealed thata ll airspeed
indication systems had failed for a short time due to
an occlusion of the pressure ports as a result of ice
formation on the pitot tubes. The result of the
investigation confirms the assumption based on past
reports by several operators on varying/failed airspeed
indications that the design of the pitot tubes does not
allow unrestricted flight operations with the aeroplane
type in heavy rain and under severe icing
conditions.Since the AOM and other documents for the
aeroplane type A 320 do not define restrictions for
flights under severe icing conditions, the incident is
finally due to a type design problem.
Safety Recommendations
The result of the investigation has prompted the BFU to
issue the following safety recommendations:
01/99 The specification for the pitot tubes should
be changed so as to allow unrestricted
flight operations in heavy rain and under
severe icing conditions. The installation of
the improved pitot tubes already designed
should subsequently be prescribed for all
types concerned by the SIL no. 34-0147 (A
320, A 321, A 330, A 340).
02/99 In case of a synchronous failure or
malfunction of systems of the same kind
(loss of redundancy, total failure) the
accomplishment of special actions (e.g. an
assessment of the finding) prior to release
of the aeroplane to service should be
prescribed in the Air Operators’ Licences
or in the instructions for maintenance and
inspection of the aeroplane types.
A draft investigation report had been submitted to the
operator concerned and the JAR 145 organisation
charged with the maintenance of the aeroplane for
comments. As has been stated by the operator, the
maintenance organisation will retrofit the aeroplanes
concerned with the technically improved pitot tubes, and
also the internal procedures will be examined.
Investigator-in-charge K. Büttner
field investigation K. Büttner
Flight Data Recorder D. Ritschel
LK COORDINATE MEASURING MACHINES
BRIDGE
CMM
CAMIO CMM
SOFTWARE
HORIZONTAL
ARM CMM
RResouFrcesM For Manufacturing, Inc.
2
Now part of the Metris family of metrology solutions, LK CMMs are leading the way, blending
CMM expertise with new sensor technologies and providing new technologies for the market.
p. 3 METRIS’ LK FAMILY
p. 4 THE BRIDGE CMM RANGE
p. 5 LK ASCENTTM
p. 6 LK INTEGRATM
p. 7 LK EVOLUTIONTM
p. 8 LK LIBEROTM
p. 9 LK ULTIMATM
p. 10 HORIZONTAL ARM CMM RANGE
p. 11 LK LY90STM
p. 12 LK HC90TM
p. 13 CAMIOTM SOFTWARE
p. 14 CMM UPGRADES AND RETROFITS
p. 15 CUSTOMER SERVICE AND SUPPORT
p. 16 THE METRIS COMPANY
Reliable and Innovative Metrology Solutions
3
Metris’ LK CMM Family
CUSTOMER REFERENCES
ABB, Airbus, Boeing, BAE, Bosch, Bridgeport, Budd, Caterpillar, Cincinnati Milacron, Cummins,
DaimlerChrysler, Dunlop, Ford, GEC, General Electric, General Motors, Harley Davidson Motor
Co, Jaguar, JCB, John Deere, Land Rover, Lockheed, Lucas, Magna Group, Marconi, Mazda,
Messier-Dowty, Michelin, Perkins Plessey, Peugeot, Pratt & Whitney, Rolls-Royce,
Shanghai General Motors, Snecma, Toyota, Volvo, etc.
INTRODUCTION
Prior to the acquisition of LK by Metris in 2006, the company
was established over a 40 year period as a premium supplier
of Coordinate Measuring Machines (CMMs) to the global
automotive and aerospace sectors, as well as to numerous
engineering companies across a wide variety of industries.
From the early days, LK pioneered innovative technologies
in the metrology market and was credited with a long list of
new technology introductions, including the fi rst bridgestyle
Coordinate Measuring Machine, the fi rst high accuracy
horizontal spindle CMM and the fi rst software developed
specifi cally for CMMs.
Now part of the Metris family of metrology solutions, LK CMMs
are once again leading the way, blending CMM expertise with
new sensor technologies and providing new technologies to
the market.
MULTI-SENSOR FLEXIBILITY
LK CMMs are designed as multi-sensor platforms.
Touch Probe Non-Scanning applications are all fully supported
for basic point-to- point inspection requirements.
Digital Touch-Trigger Probe scanning is the cost-effective
alternative to analog probe scanning when scanning
functionality is required on an infrequent basis. Using unique
Metris controller algorithms, up to 10 points per second of data
　
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