Corrosion Found

 If Level 1 corrosion is found on the second or subsequent CPCP inspection:

(1) Do the corrosion program inspection, which includes the repair of the structure. Contact Cessna Aircraft Company for an approved repair procedure.

(2) Continue with the Baseline Program.

(3) No adjustment of the existing program is required.

(4) It is recommended that you record the corrosion inspection number and the results of the inspection to show that the program was complied with.

 If Level 2 corrosion is found on the second or subsequent CPCP inspection:

(1) Repair the structure. Contact Cessna Aircraft Company for an approved repair procedure.

(2) Do a report that shows the information about the corrosion and send it to Cessna Aircraft Company and the FAA (or applicable regulatory authority).

(3) If corrosion damage required the removal of material just beyond the allowable limits (within 10 percent), complete a check of the other airplanes in the fleet before you change your aircraft's maintenance program.

(a) If the corrosion is typical of Level 2, use the fleet data to find what changes are required to control corrosion to Level 1 or better.

(b) If fleet damage is typically Level 1, examine the corroded area during subsequent inspections on all affected airplanes.

(c) Make changes to your aircraft's maintenance program if the typical corrosion becomes Level 2.

(4) Further evaluation by Cessna Aircraft Company is recommended for Level 2 corrosion findings that are well beyond the allowable limits and there is an airworthiness concern in which prompt action is required.

NOTE: The airworthiness concern is because of the possibility to have similar but more severe corrosion on any other airplane in the operator's fleet prior to the next scheduled inspection of that area.

 (5) Find the action required to control the corrosion to a Level 1 or better, between future successive inspections. These can include the items that follow:

(a) A structural modification, such as additional drainage.

(b) Improvements to the corrosion prevention and control inspections, such as more care and attention to corrosion removal, reapplication of protective finish, drainage path clearance.

(c) Decrease the inspection interval for additional airplanes that go into the program.

(6) Send a plan of corrective action to the FAA (or applicable regulatory authority) for approval and to Cessna Aircraft Company as needed.

(7) Use the approved plan of action.

H. If Level 3 corrosion is found on the second or subsequent CPCP inspection:

(1) Contact Cessna Aircraft Company and the FAA (or applicable regulatory authority) about the corrosion that was found.

(2) Send a plan to examine the same area on other affected airplanes in the operator's fleet.

(3) Apply the corrosion program inspection, which includes the repair of the structure. Contact Cessna Aircraft Company for an approved repair procedure.

I. Find the action needed to control the corrosion finding to Level 1 or better, between future successive inspections. These can include any or all of the following:

(1) A structural modification, such as additional drainage.

(2) Improvements to the corrosion prevention and control inspections, such as more care and attention to corrosion removal, reapplication of protective finish, drainage path clearance.

(3) A decrease in the inspection interval for additional airplanes entering the program.

J. Send a plan of corrective action to the FAA (or applicable regulator authority) for approval and Cessna Aircraft Company as needed.

K. Use the approved plan of action.

L. It is recommended that you give the details of the findings to Cessna Aircraft Company