CESSNA®
MODEL 525 (SERIALS -0001 THRU -0684 AND -0686 THRU -0799)
MAINTENANCE MANUAL
DISCRETIONARY MAINTENANCE
1. Scope
A. This section provides reference to discretionary maintenance tasks that may be applicable and/or
effective for individual operators.
NOTE: During the MSG-3 Maintenance Review Board Process, not all tasks recommended
in Supplier reference documents are determined applicable and/or effective for all
operators. As a result, some tasks given in the Supplier Information reference documents
are not included in the scheduled maintenance set-up of a maintenance tracking system.
However, if an operator desires discretionary maintenance tracking for any inspection
task listed in Table 1, or associated Supplier Information documents, contact your
maintenance tracking system provider to have your reports customized.
Table 1. Discretionary Maintenance
DISCRETIONARY MAINTENANCE
Maintenance Manual Task
Task Title Reference
Number
Refer to the Introduction, Supplier
Supplier Publication List Supplier Information
Publication List
15 Day High Exposure Areas -
Airplane Zone 1 Wash
(NOTE 1)
12-22-01-601
(NOTE 2)
(NOTE 3)
(NOTE 4) Citation Standard Practices
45 Day Medium Exposure Areas - Manual, Chapter 20, Exterior
Airplane Zone 2 Wash - Cleaning/Washing/Rinse -
Servicing
(NOTE 1) Citation Standard Practices
12-22-01-602 Manual, Chapter 51, Corrosion -
(NOTE 2)
Description and Operation
(NOTE 3) Citation Standard Practices
Manual, Chapter 51, Corrosion
(NOTE 4) Severity Maps - Description and
90 Day Low Exposure Areas - Operation
Airplane Zone 3 Wash
(NOTE 1)
12-22-01-603
(NOTE 2)
(NOTE 3)
(NOTE 4)
Microbiological Contamination
Inspection (Airplanes Not Using the
Biocidal Preventative Treatment) Chapter 28, Fuel Contamination -
28-00-02-220
Inspection/Check
(3 Months)
(NOTE 5)
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© TEXTRON AVIATION INC. Nov 1/2020
CESSNA®
MODEL 525 (SERIALS -0001 THRU -0684 AND -0686 THRU -0799)
MAINTENANCE MANUAL
Table 1. Discretionary Maintenance (continued)
DISCRETIONARY MAINTENANCE
Maintenance Manual Task
Task Title Reference
Number
Microbiological Contamination
Inspection (Airplanes Using the
Biocidal Preventative Treatment) Chapter 28, Fuel Contamination -
28-00-02-221
Inspection/Check
(12 Months)
(NOTE 5)
NOTE 1: Aircraft washes are a key component of any CPCP. Airplane washes remove corrosive agents from
the surface of the airplane.
NOTE 2: These wash intervals are a baseline aircraft wash schedule. If an aircraft flies into any Severe
Corrosion Areas during its operation route, it may be necessary to increase the frequency of the
wash schedule.
NOTE 3: Cessna strongly recommends washing or rinsing the airplane as soon as possible, no later than three
days, after any operation that exposes the airplane to Runway De-Icing (RDI) fluids or airplane deice/
anti-ice fluids. Any delay can result in the greater likelihood of corrosion.
NOTE 4: Operators can refer to the Exterior Cleaning procedures in the Citation Standard Practices Manual,
Chapter 20, Exterior - Cleaning/Washing/Rinse - Servicing. The description and operation of corrosion
can also be found in the Citation Standard Practices Manual, Chapter 51, Corrosion - Description and
Operation. Corrosion severity maps can be found in the Citation Standard Practices Manual, Chapter
51, Corrosion Severity Maps - Description and Operation.
NOTE 5: The recommended test interval is considered a baseline interval. Based on the history of the airplane
and other risk factors, it may be necessary to increase the frequency of the treatment. Refer to Chapter
28, Fuel Contamination - Description and Operation for a list of risk factors.
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© TEXTRON AVIATION INC. Nov 1/2020
