Transcript REUNION COMMERCIALE

Ground Bond Testing for
Production and Maintenance
Summary
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Why measure bonding resistance ?
RCP2A Presentation
RCP2APro software
RCP2A advantages
Customer targets
The effects of lightning
strikes ?
 Lightning : a danger for planes!
 On average every civil transport aircraft is struck by
lightning in flight once a year
 The risk of strikes by lightning is increased in rainy
zones, at approximately 4000 meters and between 5°C and +5°C
 During a strike by lightning, the lightning does not
stop on the plane but sweeps it to continue its way in
the atmosphere with a point of initial entrance and a
point of final exit
Direct effects of lightning
Strikes
 They are caused by the effect of the discharge or by the
conduction of the lightening strike current (up to 200 kA!)
 Types of the damage:
 Thermic with perforation of walls by fusion
 Dynamic with rise of pressure which generates a
destructive shock wave for the cabling and the
dissimilar and composite materials.
 Electromagnetic which perturbs the on board
equipment
Direct effects of lightning
Strikes
Why measure the
bonding resistance ?
 A plane with a structure and a metal envelope
(aluminium) constitutes an excellent protection against
lightning strikes provided electric continuity is insured
 Connection of dissimilar materials can cause a
weakness in the electric conductivity and prevent the
effective discharge of electric loads received by the
plane
 The bonding of these surfaces becomes indispensable
and thus the control of this bonding and the continuity
Bonding resistance measurement with new
Sefelec Milliohmmeter RCP2A
RCP2A > The right solution for bonding resistance measurement
according to all current aircraft specifications
RCP2A
The milliohm meter RCP2A is a measuring device of
resistances from 100 µ to 6  with currents of 0.1 A, 1
A or 10 A.
Presented in a fibreglass and resin polyester box of
small dimensions (340x120x220 mm) with a weight of 4
kg, its ergonomics allows the user to use it either placed
on the ground or across one’s shoulder or chest.
A wide back-lit LCD display combined with an intuitive
keyboard ensure simple and easy operation.
Specifications
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Range
Current
Resolution
Precision
6 m
1A / 10A
1µ
(0,1% lect+0,1% PE)
60 m
1A / 10A
10µ
(0,1% lect+0,1% PE)
600 m
1A / 10A
100µ
(0,1% lect+0,1% PE)
6000 m
0,1A / 1A
1m
(0,1% lect+0,1% PE)
RS232 interface
1000 measures with 10A
Removable battery pack
Remote control at distance
Suite case
A wide range of accessories
Front panel
Red/Green light
Start/Stop
LCD sreen
Function keys
Joystick
Batteries
Enter key Measure Measure terminals
Removable battery module
Extraction handle
Charger socket
Locking screw
RS232 socket
Locking screw
Measurement
press button
Measurement method
In order to make low resistance measurement with a
high precision, the RCP2A uses the 4 wire Kelvin
method.
 2 wires are used to connect a constant current
source to the resistance to be measured
 2 additional wires are used to measure the difference
of potential directly to the terminals of the device
under test.
 With this method, the resistance of the measuring
leads does not introduce any error.
Kelvin Method
RCP2A
Accessories
(leads etc.)
+I
+U
Ic
RLead
RLead
Ux
Rx
-U
-I
Rx = Ux / Ic
Bonding
resistance
RLead
RLead
RLead = Lead resistance
RCP2APro software
RCP2A Software / Sequence mode
 RCP2APro is a powerfull, easy-to-use and user-friendly software
that creates the interface between RCP2A and PC
 It allows to program test sequences using EXCEL™, according to
Ground Test Instructions. A sequence describes the points of
bonding to be tested, along with test parameters (current and
maximum resistance)
RCP2A Software / Sequence mode
• In this modele example, Mr DUPONT has been programing 15
points for 4 different sections of an A380, with the below
specifications
RCP2A Software / Sequence mode
 Through RS232 or USB interfaces, the EXCEL™ sequence is
loaded into the RCP2A with the RCP2APro graphic interface
RCP2A Software / Sequence mode
 The user clearly sees on the LCD Display the loaded sequence and
the list of points he has to measure
BAT. : 80%
RCP2A
MANUEL
SEQU
TEST
CONF
BAT. : 80%
RANGES:
NOZE
LEFT WING
RIGHT WING
TAIL
END
LEFT WING
S : 150.0 mΩ
020:
POINT
ABSENT
I : 10A
---VALID
CONF
BAT. : 80%
m
END
RCP2A Software / Sequence mode
 Once the points have been measured and stored in the RPC2A, the
PC can upload all the measurements, for direct saving, and results
traceability
LEFT WING
S : 150.0 mΩ
I : 10A
032: 98.3
POINT
ABSENT
VALID
CONF
BAT. : 80%
m
END
RCP2A Software / Sequence mode
• In this result example, Mr DUPONT has been testing 15 points
from 4 different sections of an A380, with the below results
RCP2A advantages
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Measurement specifications
Ergonomics > small weight and volume
User friendly interfaces
Replaceable batteries of big capacity
Measurement traceability through the SEQUENCE mode
Remote control with LCD display
RS232 interface with PC download/upload facility
Wide accessory range
Measurement up to 100 meters
Approval of the equipment by Airbus
Partial testing (possibility to upload started results to the PC, and
then download them again to the RCP2A to finish the tests)
RCP2A typical customers
Manufacturers of civil and military aircrafts
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AIRBUS
BOEING
DASSAULT
EUROCOPTER
EMBRAER
FOKKER
X.A.C., …
RCP2A typical customers
The subcontractors
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SOGERMA
TURBOMECA
HISPANO SUISA
INTERTECHNIQUE, BF GOODRICH, …
RCP2A typical customers
Airlines & maintenance companies
 AIR FRANCE, LUFTHANSA TECHNIK
 AIA
 LABINAL
 JAL, AIR CHINA, KOREAN, INDIAN airlines,
ALITALIA, AUSTRIAN, THAI, TAP, SR TECHNICS, …