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All faying surfaces seams and lap joints protected by sealant shall have their entire surface coated with sealant. Excess material squeezed out shall be removed so that a fillet seal remains. Joint areas which could hold water shall be filled or coated with sealant - refer to 20-00-09.
5. CORROSION TREATMENT Refer to Page 201.
AMA
Validity : S / N 1 - 9999 20-00 0 Page 4 4 (BA) OCT 97
 
 
CORROSION SOUS TENSION
STRESS CORROSION
Les zones claires correspondent a relimination des depots
apres essuyage
Light area represents deposit wiped away
 
Metal treatment and protection
Figure 1
AAAA
Validity : S / N 1 — 9999 20`00 04 (BA) Page 5 OCT 97
 

L'electrolyte penetre par les fissures
que presente la pellicule de peinture
Electrolyte enters
through cracks in paint film Pellicule de peinture
Paint film

  SfamagiratMoiliMicakAgeknillEMAIAM  10.1ilaSiNallAlatoiNC:E441
    
    

  (Anode) Placage Clad
  

 
Corrosion intergranulaire
Intergranular corrosion
 
Attache en acier Aluminium
Steel fastener
 
CORROSION INTERGRANULAIRE
INTERGRANULAR CORROSION
Produits de la corrosion Corrosion products  Electrolyte
    
    

 

 
Metal treatment and protection
Figure 2
AAAA
Validity : S / N 1 — 9999 20-00-04Page 6
(BA) OCT 97
 
Faible concentration en ions metalliques Forte concentration en oxygene
Low metal ion concentration High oxygen concentration
 

 
PILE DE CONCENTRATION EN IONS PILE DE CONCENTRATION EN OXYGENE
METALLIQUES SUR JOINT RIVE A RECOUVREMENT OXYGEN CONCENTRATION CELL
METAL ION CONCENTRATION CELL
ON RIVETED LAP JOINT
Couche passive protegeant
exposed surface
la surface nue
Passive film protecting
,
 

 
AAAA
Validity : S / N 1 - 9999 Metal treatment and protection
Figure 3
20-00 0 Page 7
4 (BA) JUN 02
 
PAGE INTENTIONALLY LEFT BLANK
AAAA
Validity : S / N 1 - 9999
20-00-04 Page 8
20
(BA) OCT 97
 
METAL TREATMENT AND PROTECTION
MAINTENANCE PRACTICES
1. PREVENTIVE MAINTENANCE
A. Cleaning
Regular aircraft cleaning will help in corrosion prevention. This includes all operations aimed at removing all detrimental soils from surfaces.
Cleaning is undoubtedly one of the most effective means to preclude corrosion risks and detect any
incipient failure. Great caution should however be exercised to select and use cleaning products; a number
　
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