Saturday, September 15, 2012

Aged Aircraft Program II Cessna 152

1. Cessna 152 Manual is revised by (TEMPORARY REVISION NUMBER 5)                    
                         REASON FOR TEMPORARY REVISION
                           1. To add the Supplemental Inspection Documents (SIDs) Information.
                           2. To add the Corrosion Prevention and Control Program (CPCP) 
                           3. To add Control Cable Inspection Information.
                        As the airplane ages, corrosion occurs more often, while, at the same time, other types of damage such as fatigue cracks occur. Corrosion can cause damage to the airplane's structural integrity and if it is not controlled, the airframe will carry less load than what is necessary for continued airworthiness.
                     To help prevent this, Cessna started a Corrosion Prevention and Control Program (CPCP). A CPCP is a system to control the corrosion in the airplane's primary structure. It is not the function of the CPCP to stop all of the corrosion conditions, but to control the corrosion to a level that the airplane's continued airworthiness is not put in risk.
3. Control Prevention and Control Program Application
             The CPCP gives the information required for each corrosion inspection. Maintenance personnel must fully know about corrosion control. The regulatory agency will give approval and monitor the CPCP for each airplane. The CPCP procedures apply to all airplanes that have exceeded the inspection interval for each location on the airplane.
4. Baseline Program : is part of the CPCP. It is divided into Basic Task and Inspection Interval.  Basic Tasks are referred to as the Corrosion Program Inspection. This program is to be used on all airplanes without an approved CPCP. 
5.Zone Corrosion Program Inspection Procedures.
6.CPCP Function : to give the minimum procedures necessary to control the corrosion so that the continued airworthiness is not put in risk. The CPCP consists of a Corrosion Program Inspection number, the area where the inspection will be done, specified corrosion levels and the compliance time. The CPCP also includes procedures to let Cessna  and the regulatory authorities know of the findings and the data associated with Level 2 and Level 3 corrosion.
This includes the actions that were done to decrease possible corrosion in the future to Level 1.
7.CPCP ReportingThe minimum requirements to prevent or control the corrosion CPCP were made on the best information, knowledge and experience available at the time. As this experience and knowledge increases, the CPCP's intervals will be changed as necessary.
8. Corrosion Found
9.Actions Follow Corrosion : If corrosion is found, find the corrosion level, then do the necessary steps for a specific inspection.
10..Determination of the Corrosion Levels : Find the Corrosion Levels. Corrosion found on a structure when you use the Corrosion Program and Corrosion Prevention.
11.Level 2 Corrosion Findings : All Level 2 corrosion that is more than the rework limits of the approved repair procedures must be reported to Cessna. Cessna will do an analysis to make sure the corrosion is not an urgent airworthiness concern.
12. Types of Corrosion 
13.Corrosion CharacteristicsCorrosion is the deterioration of a metal by reaction to its environment. Corrosion occurs because most metals have a tendency to return to their natural state.

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