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Deterioration of the aircraft’s external surface is a normal consequence of its use. Like all modern commercial aircraft, those of the A320 Family must be maintained in accordance with the approved maintenance schedule. One objective of the maintenance schedule is to preserve aircraft’s operational efficiency by the most economic means possible. This is achieved through inspection, and subsequent repair as necessary, in specified areas at specified intervals. These intervals are the minimum allowable and the industry is constantly seeking to extend all task intervals. Carrying out any maintenance task more regularly will inevitably increase maintenance costs. However, in this section we consider tasks that can bring considerable reductions in fuel consumption when the need for repair is discovered.
3.2.5.3.1. General
In terms of overall airframe condition
Reference documents
(dents, panel gaps, under or over filled Getting Hands-on Experience with panel joints, etc…) particular attention Aerodynamic Deterioration – issue 2, October
2001
should be paid to areas of the airframe that
SRM 51-10-00 PB001
air impinges on first (e.g. forward portion of the fuselage, the nacelles, the wings, the fin, etc). These areas are defined more clearly in the document referenced in the adjacent text box. The document also contains a detailed assessment of all areas where aerodynamic deterioration
may occur.
Data - Mission A 
Annual cycles:  1800 
Annual Flight Hours:  2700 
Average sector length (Hours):  1.5 
Data - Mission B 
Annual cycles:  1500 
Annual Flight Hours:  3000 
Average sector length (Hours):  2 
Data - Mission C 
Annual cycles:  1100 
Annual Flight Hours:  3300 
Average sector length (Hours):  3 

The following sections highlight airframe problems that are both typical in-service and have a particularly negative impact on aerodynamic performance. In each case, the problem is presented in terms of additional fuel burnt per sector (for the selection of typical missions shown in the adjacent text box), and this is also expressed in terms of additional fuel cost per month (charts showing cost per year are presented earlier in this document).  Once again, in the interests of clarity two different cost axis scales are used. To highlight the
variations in cost axis scale, a fixed cost reference line has been added to each chart. Given that these charts show monthly figures the reference cost is US$5,000 ( 

US$5,000 ).

Unlike the operational issues
Percentage variation from A320 - all defects
described earlier in this
A318 A319 A320 A321
document, the effect of the
Mission A -26% -11% 0% 5% contributors to aerodynamic Mission B -19% -5% 0% 14% deterioration varies quite Mission C -27% -7% 0% 10% significantly with aircraft type.
　
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