REUNION COMMERCIALE

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Ground Bond Testing for Production and
Maintenance
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Summary

• Why measure bonding resistance ?
• RCP2A Presentation
• RCP2APro software
• RCP2A advantages
• Customer targets

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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 -5C and 5C
• 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

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Direct effects of lightningStrikes

• 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

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Direct effects of lightning Strikes
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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

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Bonding resistance measurement with new Sefelec
Milliohmmeter RCP2A
RCP2A gt The right solution for bonding resistance
measurement according to all current aircraft
specifications
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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
  ones shoulder or chest.
• A wide back-lit LCD display combined with an
  intuitive keyboard ensure simple and easy
  operation.

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Specifications
Range Current Resolution Precision
6 mW 1A / 10A 1µW (0,1 lect0,1 PE)
60 mW 1A / 10A 10µW (0,1 lect0,1 PE)
600 mW 1A / 10A 100µW (0,1 lect0,1 PE)
6000 mW 0,1A / 1A 1mW (0,1 lect0,1 PE)

• RS232 interface
• 1000 measures with 10A
• Removable battery pack
• Remote control at distance
• Suite case
• A wide range of accessories

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Front panel
Red/Green light
LCD sreen
Joystick
Batteries
Measure
Enter key
Start/Stop
Function keys
Measure terminals
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Removable battery module
Measurement press button
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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.

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Kelvin Method

RLead
RLead
RLead
-I
RLead Lead resistance
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RCP2APro software
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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)

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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

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RCP2A Software / Sequence mode

• Through RS232 or USB interfaces, the EXCEL
  sequence is loaded into the RCP2A with the
  RCP2APro graphic interface

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RCP2A Software / Sequence mode

• The user clearly sees on the LCD Display the
  loaded sequence and the list of points he has to
  measure

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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

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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

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RCP2A advantages

• Measurement specifications
• Ergonomics gt 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)

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RCP2A typical customers
Manufacturers of civil and military aircrafts

• AIRBUS
• BOEING
• DASSAULT
• EUROCOPTER
• EMBRAER
• FOKKER
• X.A.C.,

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RCP2A typical customers
The subcontractors

• SOGERMA
• TURBOMECA
• HISPANO SUISA
• INTERTECHNIQUE, BF GOODRICH,

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RCP2A typical customers
Airlines maintenance companies

• AIR FRANCE, LUFTHANSA TECHNIK
• AIA
• LABINAL
• JAL, AIR CHINA, KOREAN, INDIAN airlines,
• ALITALIA, AUSTRIAN, THAI, TAP, SR TECHNICS,