panAero is an Australian company which was established
to provide runway friction testing services to airports
in order to satisfy regulatory requirements contained
MOS 139 and ICAO
Equipment used is a specialist friction trailer
(CASA approved self wetting
CFME) with control computers integrated into
a modified SAAB 9-5 SportEstate. The trailer is
Master Calibrated to ASTM
E2100-04 standard to ensure accuracy and
repeatability and is capable of being used as a
friction reference device. Dual water tanks are
installed in the control vehicle which enables the
testing of runways in excess of 6,000 metres.
Testing is done to MOS 139 criteria using the
guidelines outlined in FAA
AC 150/5320-12C. More comprehensive testing
to UK CAA
CAP 683 is also available if required.
panAero consists of two principles with over
60 years combined experience in the aviation industry.
Both are qualified aircraft performance engineers
with heavy jet flying experience which provides
a unique operational perspective to delivered services.
1. Computer system
The computer system
includes the measurement computer, main computer
with printer and an operator's panel with only six
keys to simplify the handling of the system.
The computer is pre-programmed for measurement
and presentation in accordance with ICAO, FAA, and
UK CAA CAP 683. The computer system controls the
measuring procedure and presents the results on
the computer display and/or on a paper printout.
2. Self-watering system
The FAA and ICAO
clearly state that a CFME must have a self-watering
system. The self-watering system sprays a water
layer on the runway surface in front of the measuring
wheel. The tank volume is sufficient for measuring
more then 10,000 meters of runway with a water layer
depth of 1 mm (0.04").
3. Measurement computer
4. Torque sensor
receives analogue signals from sensors and the pulse
transmitter (speed) and converts the signals into
digital signals that are fed into the computer for
calculations and presentation.
When the measuring wheel
slips on the runway surface, the friction creates
a torque which is transferred to the chain system
and measured by a load sensor.
5. Vertical load sensor
6. Measuring wheel
the vertical down pressure created by the hydraulic
system, and makes any necessary adjustments to it.
It ensures that an absolute constant ground contact
pressure is kept.
A special high pressure
tyre, the Friction Tester "Aero" tyre
has been developed for operational measurement purposes.
Measuring results with this tire have been shown
to correlate well with aircraft braking characteristics.
For calibration purposes a low pressure tyre can
be used. The slip ratio of the measuring wheel is
about 13%, the exact value depending on the wear
of the measuring tire and trailer tyres.
7. Hydraulic system
This system provides
constant pressure for the wheel retraction mechanism
and for the vertical load on the measuring wheel.