1. An AleniaAeronautica and EADS joint venture
FOR YOUR INFORMATION
Please be informed the following “Draft Advanced Copy” have the intent to cover some changes of last
revision of the MPD
Definitive AMM will be available, as usual, at your next doc. revision.
20-42-00-GVI-10000
20-42-00-GVI-10005
Advance Copy ESPM 20 52 00 EWIS
AMM 20 20 00 Standard Practices
AMM 20 42 00 Zonal Inspection EWIS
Avions de Transport Régional. 1, allée Pierre-Nadot 31712 Blagnac Cedex - France
Phone : +33 (0)5 62 21 62 21 - Fax : +33 (0)5 62 21 68 00 - www.atraircraft.com
Groupement d'intérêt économique régi par l'ordonnance numéro 67 821 du 23 septembre 1967
APE 353 B - SIRET 323 932 236 00033 - R.C. 323 932 236
2. Job Instruction Card 204200 GVI 10000
GENERAL VISUAL INSPECTION
OF ROUTE 1P
FWD FUSELAGE SECTION
UNDER FLIGHT COMP. ‘EWIS’
OP
TECHNICAL DATA
ZONING DATA
ZONE : 113;114
ACCESS: 211HF; 211GF; 212HF; 212GF
PREPARATION
WORK SKILL MEN MAN-HOURS
ELECTRIC 1
ELAPSED TIME
GSE
SPARE
EXPENDABLE
BULK MATERIAL
PUBLICATION: SPM 20-52-00
CUSTOMER EFFECTIVITY :ATR DATE 12/03/10 PAGE 1
3. Job Instruction Card 204200 GVI 10000
TASK DESCRIPTION
001 001 PREPARATION
1. IN THE FLIGHT COMPARTMENT:
OPEN THE ACCESS PANELS 211HF; 211GF; 212HF; 212GF
2. CLEAN THE AREA.
REF. TO STANDARD PRACTICE MANUAL 20-52-13.
002 WIRING INSPECTION
REF. FIG.: 204200-GVI-OO1 00
204200-GVI-O01 01
204200-GVI-001 02
WITH REFERENCE TO THE STANDARD PRATICE MANUAL 20-52-10
PERFORM A GENERAL VISUAL INSPECTION OF
THE WIRINGS INSTALLED ON FORWARD FUSELAGE
SECTION UNDER FLIGHT COMPARTMENT, FOR CONDITION
AND CORRECT INSTALLATION.
003 CLOSE-UP
INSTALL THE ACCESS PANELS PREVIOUSLY OPENED.
CUSTOMER EFFECTIVITY :ATR DATE 12/03/10 PAGE 2
7. Job Instruction Card 204200 GVI 10005
GENERAL VISUAL INSPECTION
OF ROUTE 1G/2G IN THE
INBOARD LEADING EDGE. ‘EWIS’
OP
TECHNICAL DATA
ZONING DATA
ZONE: 511; 611
ACCESS: 511;611
PREPARATION
WORK SKILL MEN 2 MAN-HOURS
MECHANIC 1
ELECTRIC 1
ELAPSED TIME
GSE
SPARE
EXPENDABLE
BULK MATERIAL
PUBLICATION: SPM 20-52-00
CUSTOMER EFFECTIVITY :ATR DATE : 12/03/10 PAGE 1
8. Job Instruction Card 204200 GVI 10005
TASK DESCRIPTION
001 001 PREPARATION
1. INSTALL THE PLATFORM TO GAIN THE ACCESS
TO THE INBOARD LEADING EDGE.
2. REMOVE THE LEADING EDGE:51 1; 611
3. CLEAN THE AREA.
REF,TO STANDARD PRATICE MANUAL 20-52-13.
002 WIRING INSPECTION
REF.FIG.: 204200-GVI-00105
WITH REFERENCE TO STANDARD PRATICE MANUAL 20-52-10
PERFORM A GENERAL VISUAL INSPECTION OF
THE WIRING INSTALLED IN THE INBOARD LEADING EDGE LH (RH)
FOR CONDITION AND CORRECT INSTALLATION.
003 CLOSE-UP
1. INSTALL THE LEADING EDGE PREVIOUSLY OPENED.
CUSTOMER : EFFECTIVITY :ATR DATE : 12/03/10 PAGE 2
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20-52-00 Zonal inspection EWIS
1 . Definition
EWIS : Electrical wiring interconnection system.
The aim of EWIS task is to minimize the accumulation of combustible material in a zone containing
wirings.
List of combustible material:
- dust, lint, fuel vapour, fuel leakage, oil mist, hydraulic mist.
- Vaporised synthetic oil and hydraulic fluids (e.g., skydrol) should be considered combustible for
EWIS purpose. In non-vaporised state where these fluids are not considered combustible, they are
a concern if they cause significant adherence of dust and lint.
The following materials should not be considered as ignitable:
- Uncontaminated insulation blanket, however blankets soaked with hydraulic fluids will become
combustible according to the flammability criteria of the hydraulic fluid. The only risk factor
introduced by the blanket is the propagation of the hydraulic contamination by capillarity.
- Structural corrosion inhibitors, i.e. Temporary Protection System, although there is a flash point
at ambient temperature.
- Moisture (though it may increase the probability of arcing)
- Wiring insulation
2 . General
This chapter gives general rules for electrical inspection/checks.
A. Whenever a wire is added, repaired, disconnected or reconnected, it is necessary:
- To make sure that the wire is correctly mechanically connected to the plug or terminal
block module (as applicable):
Example: For wires with crimp contacts, lightly pull the wire to make sure the crimping
is correct.
- To perform a continuity check and then do an operational or a functional test of the
related function.
B. Whenever a connector is disconnected/reconnected:
- Perform a visual check of the connector locking.
- Perform an operational test or a functional test of the related functions.
3 . Structure of this subchapter
A. Visual Checks (Ref. 20-52-10)
B. Manual Checks (Ref. 20-52-11)
C. Ageing Checks (Ref. 20-52-12)
D. Cleaning Procedure (Ref. 20-52-13)
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20-52-10 Visual Checks
1 . General
This chapter provides the general inspection rules applicable to the different
electrical installation components.
2 . Procedure
A. Perform a visual check of these components.
(1) Wire harnesses
Perform a check for:
- contact between the harness or between the harness and the structure,
- loose harness or badly secured harness,
- damaged cables (due to mechanical impact, overheat, chafing, etc.),
- missing cable ties and tapes,
- worn or broken cable protection sheaths,
- movement of the sheath end on the support component,
- missing or damaged grommets.
- if cables are installed in conduits, draw wires must be inserted,
- if requested, cable harness with protective conduits,
- minimum distances observed and protections against fretting provided,
- segregation between incompatible routes, especially at connector plate interfaces,
- cable bend radii not less than the minimum value required,
- cable deflections not too high and cables not causing overstressing on connecting items,
- sufficient lengths at ends available for replacement of end fittings,
- drip loops installed where required,
- conduits installed with drain holes at lowest points,
- maximum harness diameter allowed by mounts not exceeded,
- harnesses tied with required means,
- for harnesses consisting of several bundles, cable tie heads turned to face outwards,
- no over length,
- dust and lint accumulation (surface contamination by metal, contamination by liquid,
deterioration of previous repairs). Remove foreign bodies by suction.
(2) Connectors
Perform a check for:
- corrosion on shells,
- damaged grommets,
- incorrect retention of the cables at the backshells (broken tail),
- cushion missing on backshell,
- cable tie missing on backshell,
- incorrect installation of backshell,
- broken foolproofing chains,
- missing lockwire,
- adhesive markers attached to the structure,
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-missing sealing plugs in the unused contacts (in not pressurized aeras),
- loose connectors,
- unused receptacles with no protective covers.
B. Perform a visual check of connector locking
(1) Circular connectors
(a) Bayonet locking
Make sure that you can see the locking studs through the coupling nut
(b) Screw-type locking
(Possibility of wire locking)
Make sure that the connector is correctly screwed in.
Make sure that the lockwire is not broken (if installed).
(c) Screw-type locking and clicker nut
Make sure that you cannot see the color band.
(d) Screw-type locking (Self locking)
Make sure that you cannot see the color band.
(2) Rectangular connectors
(a) Locking type Bayonet
Make sure that you can see the locking studs.
(b) Locking type Slider plate
-Make sure that the slider plate is in the correct position.
-Make sure that you can see the color band (if applicable).
(c) Locking type Lever
Make sure that you can see the levers.
(3) Coaxial connectors
(a) Locking type Bayonet
Make sure that you can see the locking studs.
C. Switches
Perform a check of the rear protection cap for damage.
D. Splices and Terminals
Perform a check for Corrosion, mechanical damage (cracks,etc.), heat damage
(discoloration, burns) or chemical contamination to:
- the insulation,
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- the tongue,
- the barrel,
- the retaining sleeve.
Perform a check of the assembly on largue-gauge studs.
E. Ground Points
Make sure that:
- you can see the tightening marks and that they are aligned,
- the protective coating is not damaged,
- there is no corrosion.
Perform a check of the general conditions related to the grounding and electrical bonding
method.
F. Bonding Braids
Make sure that:
- the bonding braids are in position,
- you can see the tightening marks,
- there is no corrosion on braid wires,
- the braid wires are not broken.
G. Identifications
Make sure that:
- the identifications are in position,
- you can read the markings,
- the identifications are correctly bonded,
- you can see the tightening marks,
- harnesses are correctly identified.
H. EWIS Supports or Clamps
Perform a check of the general condition:
- presence,
- protection,
- rupture,
- corrosion,
- deformation,
- position,
- attachment (missing or incorrect),
- no cable pinched.
J. Metal Supports - Tubes or Rails
Perform a check of the general condition:
- protection (missing or damaged),
- rupture,
- deformation,
- missing attachment.
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K. Raceways
- raceways aligned, junctions and specified distances correct
- cable route, maximum filling ratio not exceeded,
cable insulations not damaged or distorted and harnesses placed in raceways without
stress and without twisting,
- retaining blocks correctly positioned (protrusions facing upwards) and specified
distanced observed,
- bearing pads in retaining blocks engaged and adjusted in corresponding raceway
cavities,
- each raceway cavity equipped with its bearing pad where required,
- no foreign objects remaining in raceways.
L. Terminal Blocks
Perform a check of the general condition:
- incorrect tightening of terminals,
- damaged dielectric protection,
- position,
- discoloration/coincidence on terminal lugs/blocks.
NOTE : If you find damage during the visual check, it is necessary to
repair the defective component(s). Refer to the applicable Repair Processes chapters.
M. Circuit Breakers, contactors or relays
Make sur that:
- they are correctly installed,
- there is no sign of overheat.
N. Backshells
Perform a check for:
- corrosion or breaks,
- incorrect retension of the cables,
- cable tie missing,
- incorrect installation.
P. Conduits
Make sure that:
- there is a drain hole at the lowest point and that it is not blocked,
- the conduit is correctly installed.
Perform a check for:
- damaged conduits (crushing, corrosion, cracks, holes, etc.),
- liquid contamination or penetration.
Q. Lugs
Make sure that:
- the terminal lugs are correctly installed on the stud,
- the installation order of the terminal lugs is correct.
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20-52-11 Visual Checks
1 . General
This chapter gives the general inspection checks applicable to the different electrical
installation components.
2 . Check
Perform a manual check of these components.
A. Dundle attachment
(1) V-supports
Make sure that the size of the support is correct
- if the support is too large, add glass tape ASNA5107 on the periphery of the harness (2
turns minimum)
- if the support is too small, add a bushing NSA5539 or a round bar (dia. 1.5 mm (0.0590
in.) or 3 mm (0.1181 in.), 20 mm (0.7874 in.)length) at the bottom part of the support.
(2) Clamps
Make sure that the harness (or the convoluted conduit) does not move in the clamp when
you apply a light force to the harness.
(a) If the harness moves:
- remove the clamp,
- install a smaller diameter clamp or add glass tape ASNA5107 on the harness.
(b) If the convoluted conduit moves:
- remove the clamp,
- add glass tape on the conduit,
- install a smaller clamp.
B. Loss of segregation
This can occur when there is extra length on the cable.
(1) EFCS (if installed) or engine parallel routes
Measure the distance between the two routes. The distance must be 25 mm (0.9842 in.) or
more at all locations; this includes areas where there is cable deflection.
If the distance is less than 25 mm (0.9842 in.):
- distribute the extra length along the harness, or
- use a sleeve ABS0596 on one of the two routes, attached with cable
ties NSA935401 at level of the non-conformity.
(Ref. Fig. 001)
(2) Parallel routes other than EFCS (if installed) or engine
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Measure the distance between the two routes. The distance must be 25 mm (0.9842 in.) or
more at all locations; this includes areas where there is cable deflection.
If the distance is less than 25 mm (0.9842 in.):
- distribute the extra length along the harness, or
- add a spacer ABS0054 attached with cable ties
(Ref. Fig. 001)
(3) EFCS (if installed) or engine perpendicular routes
Measure the distance between the two routes. The distance must be 25 mm (0.9842 in.) or
more at all locations; this includes areas where there is cable deflection.
If the distance is less than 25 mm (0.9842 in.):
- distribute the extra length along the harness, or
- use a sleeve ABS0596 on one of the two routes , attached with cable ties.
(Ref. Fig. 002)
(4) Parallel routes other than EFCS (if installed) or engine
Measure the distance between the two routes. the distance must be 25 mm (0.9842 in.) or
more at all locations; this includes areas where there is cable deflection.
If the distance is less than 25 mm (0.9842 in.):
- distribute the extra length along the harness, or
- use a spacer NSA5527 on one of the two routes, attached with a cable tie.
(Ref. Fig. 001)
(5) P Routes
The measured distance between the two routes must be more than 25 mm (0.9842 in.)
If the distance is less than 25 mm (0.9842 in.):
- add clamps NSA5516 installed head-to-tail.
(Ref. Fig. 001)
C. Mechanical Interfaces
(1) Harness routed above or below an obstacle
Measure the distance between the harness and the obstacle. The
distance must be more than:
- 10 mm (0.3937 in.) if the harness is routed above the obstacle
- 5 mm (0.1968 in.) if the harness is routed below the obstacle
If the distance is less than these values:
- Apply teflon adhesive tape on the structure.
2) Bundle at level of a fixed clamp
(Ref. Fig. 003)
Measure the distance between the bundle and the obstacle. The
distance must be more than 5 mm (0.1968 in.).
If the distance is less than 5 mm (0.1968 in.):
- Apply teflon adhesive tape on the structure.
3) Bundle routed through a structure hole
(Ref. Fig. 003)
Measure the distances D1 and D2 between the bundle and the struture.
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D1 must be more than 20 mm (0.7874 in.) and D2 must be more than 15
mm (0.5905 in.).
If the distances are less than these values, install a protection on
the edge of the hole with silicone extrusion NSA360002 or equivalent.
_N_O_T_E : If you cannot use the methods given in steps (1), (2) and (3)
for the protection of the structure, do these steps:
In the pressurized zones:
- protect the bundle with a velcro sleeve NSA0507 attached
with cable ties.
In the non-pressurized zones:
- protect the bundle with a split sleeve attached with cable
ties.
4) Bundle attached with a movable clamp
Measure the distance between the bundle and the structure. The
distance must be more than 10 mm (0.3937 in.).
If the distance is less than 10 mm (0.3937 in.):
- turn the clamp to a different direction to prevent interference
with the structure;
- distribute the extra length.
If you cannot do these steps, protect the structure with teflon
adhesive tape.
5) Loose conduits that touch the structure or another component
(Ref. Fig. 004)
Measure the distance between the conduit and the structure. The
distance must be more than or equal to 10 mm (0.3937 in.).
D. Defective length
(1) Extra length on technical and standard cabin furnishings harnesses
The cable extra length is necessary for:
- connector removal/installation
- contact locking/unlocking
- drip loop.
The extra length must be between 30 mm (1.1811 in.) and 50 mm (1.9685 in.) . If the
extra length is more than 50 mm (1.9685 in.) , distribute the length along the harness to
get the 50 mm (1.9685 in.) value.
If you cannot distribute the extra length along the harness, cut the harness to the required
length.
(2) Extra length on (version) cabin furnishings harnesses
For these harnesses, the extra length is sufficient to adapt to different versions of cabin
layout.
If the extra length is more than 50 mm (1.9685 in.) , make a loop and if necessary, install
a dual support.
E. Braided sheaths
Move a cloth along the sheath to find broken braid wires.
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A maximum number of 3 broken wires is permitted. If more, change the
sheath.
F. Connectors
(1) To prevent contact deterioration when you connect the plug connectors, push the
dummy contacts to make sure that they are engaged correctly.
(2) Make sure that the contacts are correctly locked in the cavities by lighthy pulling the
cable rearwards.
No significant movement must be felt.
(3) Make sure the connector backshell is correctly installed by lightly pulling the locking
wire (if installed)
No significant movement must be felt.
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Fig. 001
Fig. 001 - Loss of segregation
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20-52-12 Ageing Checks
1 . General
This chapter gives general inspections of the electrical installation to find (and repair)
possible deterioration because of ageing.
CAUTION: TEMPORARILY SUPPORT AND/OR INSTALL PROTECTION FOR
THE HARNESS WHEN YOU REMOVE HARNESS ATTACHMENTS TO PREVENT
DAMAGE TO THE HARNESS.
2 . Harness Sagging
A. Description of wire harness sagging
Harness sagging is an increase in the length of harness between two
adjacent attachments that causes the harness to hang down too much.
Sagging occurs when the harness gradually moves from its initial
trajectory because of slippage at its attachments.
When this movement starts, it usually gets faster with time.
Sagging can cause:
- Possible loss of segregation,
- Wire damage because of chafing between the harness and the adjacent
structure and/or equipment and/or wiring and/or EWIS,
- Drip loops to become straight,
- Too much tension in the harness between attachments or at connectors.
B. How to find harness sagging on the aircraft.
Note: Cable harness usually hang down a little between adjacent attachments.
This is not an incorrect condition and action is necessary only if the
harness moves from its initial trajectory and hangs down too much between
two adjacent attachments.
To find sagging, look for these conditions:
- A harness that hangs down too much between two adjacent attachments
(Ref.20-52-11),
- No more segregation between harness (Ref.20-52-11),
- Risk of chafing between the harness and the adjacent structure and/or
equipment and/or wiring and/or EWIS (Ref.20-52-11),
- Missing drip loops/harness pulled straight.
(Ref. Fig. 001)
Note: The increased length between the attachments can come from:
- Drip loops,
- Stowed harness,
- Play in the harness at other locations.
C. Repair Procedure
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Do a check of the harness installation upstream and downstream of the sagging to find
the location(s) where there is too much tension or reduced length.
(Ref. Fig. 001)
Remove all the harness attachments between the sagging and the location(s) of reduced
length/too much tension.
Re-distribute the sagged length to the location of the excessive tension/reduced length.
Adjust the harness and do a check for.
- Loss of segregation,
- Risk of chafing,
- Too much tension,
- Presence of drip loops,
Adjust the harness again if necessary,
Install self adhesive tape ASNA5107 (Ref. process described below) at the locations of
all removed attachments,
Install the harness attachments, (Ref. procedure below).
Note: For correct attachment, the internal diameter of the attachment, to be installed must
be slightly smaller than the diameter of the harness with its adhesive tape.
Pull lightly on the harness to make sure that it is correctly attached.
D. ASNA5107 Self Adhesive Tape Installation Procedure.
(1) General Procedure
- Remove all cable ties or lacing tape at all securing locations over a length of 50 to 60
mm on each side of the attachment.
- Insert one end of a piece of self adhesive tape ASNA5107 through the harness to
separate the harness in 2 equal parts .
(Ref. Fig. 002)
The tape must come out of the harness by 10 to 20 mm.
- Pull firmly on the tape and wrap it around the harness.
NOTE: The first wrap and the last wrap must have a 100% overlap.
The other wraps must have a 50% overlap.
- Attach the two ends of the tape with cable ties NSA935401.
(Ref. Fig. 003)
- Install all the removed cable ties.
(2) Procedure for an over-length stowage loop
(Ref. Fig. 004)
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- Remove all cable ties or lacing tape on the over-length part of the
harness.
- Make a loop to stow the harness over-length.
- At the location where the loop touches the harness, insert one end
of the adhesive tape between the two parts of the harness.
- Install two cable ties NSA935401 at each side of the location of
the adhesive tape.
- Pull firmly on the tape and wrap it around the harness.
Note: The first wrap and the last wrap must have a 100% overlap.
The other wraps must have a 50% overlap.
- Attach the two ends of the tape with cable ties NSA935401.
(Ref. Fig. 004)
- Install all the removed cable ties.
3 . Clamps Sliding on Struts
A. General
This paragraph gives the procedure for the installation of harness attachment clamps or
large or tapered struts.
Always do this procedure when you find deterioration of the initial installation (loose
clamp, deterioration at the tape and/or grommet).
Note: This process is not applicable inside fuel tanks.
B. Procedure
(Ref. Fig. 005)
- Remove the clamp assembly (the strut clamp and the harness clamp) and the existing
tape from the strut.
- Remove the remaining traces of glue on the strut with cleaning agent (Material No.11-
008A, 11-026) or equivalent).
- Install self adhesive tape ASNA5107 on the strut.
Note: Pull firmly on the tape and wrap it around the strut.
- Attach the two ends of the tape with cable ties NSA935401-08 or equivalent.
- Install a strut clamp that has an internal diameter slightly smaller than the outer
diameter of the strut + tape.
- Install the harness clamp.
4 . Clamps at the end of Convoluted Conduits.
This chapter gives the correspondence between NSA935807 and NSA5516 clamps.
We recommend the installation of NSA5516 grommet clamps as an alternative to
NSA935805 metal clamps at the end of convoluted conduits. The grommet
prevents contact between the wires and the metal part of the clamp if the
conduit moves out of the clamp.
(Ref. Fig. 006)
CAUTION: YOU MUST USE THE TYPE OF NSA5516 CLAMP THAT IS
APPLICABLE FOR THE AREA
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IN WHICH YOU INSTALL IT.
ALWAYS REFER TO CHAPTER 20-33-XX TO KNOW THE FULL PN OF THE
CLAMP
APPLICABLE FOR ITS ENVIRONMENT ON THE AIRCRAFT.
EXAMPLE:
- NSA5516C FOR HOT AND FIRE AREAS
- NSA5516XXXF FOR FUEL AREAS
- NSA5516XXXJ FOR HYDRAULIC FLUID AREAS.
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20-52-13 Cleaning Procedure
1 . General
This chapter gives the general instructions related to the contamination of electrical
components.
The contamination can be :
- natural: the contamination agent is an identified material used in the aircraft systems
(hydraulic fluid, oil, fuel, etc.),
- accidental: the contamination agent comes from an external source (cleaning agent,
etc.),
- the effect of ageing : the contamination agent is dust, lint or fluff.
2 . Procedure
A. In relation to the type of contamination :
- stop the contamination source.
- keep the area that has contamination to a minimum,
- estimate the damage in the contamined area,
- select the applicable cleaning procedure.
B. Type of Contamination
(1) Liquid contamination:
- stop the contamination source.
- make a sealed barrier, usually with cloth, to stop the liquid and prevent contamination
of the adjacent areas,
- remove the contamination with cloth or a vacuum cleaner for liquids.
(2) Dry Contamination : dus, lint, fluff, powder, and granular contamination
On wires and electrical items, dry contamination can :
- Prevent correct inspections,
- Cause fire propagation after a short-circuit or arcing.
Do these actions to clean the contaminated areas :
- make a sure that there are no draughts,
- remove the contamination with a vacuum cleaner.
C. General cleaning Principle
You must clean only the areas and items that have contamination.
In case of contamination with temporary corrosion protection (TCP) compounds:
We recommend protection of the wires from accidental contamination during application
of TCP. Dust and fluff can collect on the wire if the surface stays tacky.
However, if you accidentally apply TCP on wiring or EWIS, it is not necessary to remove
it as this material has ne effect on the integrity of the wire insulation.
If the presence of dust or fluff makes it necessary to clean the wires, you must be very
careful not to cause damage to the wires.
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