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Doc # DA201-C1
Rev. 13 05-20-00 Page 3
30 Apr 2008
In composite structures, small hairline cracks may occur in the surface finish, especially at
places where filler putty has been used. If the part has no foam core and the opposite face
is accessible and unpainted, you may be able to determine if there is damage to the
composite. If not, you must remove the paint and filler from the affected area by careful
hand sanding to expose the underlying composite.
The composite structure is protected by paint from exposure to damaging ultraviolet light
from the sun. It is important that the paint be in good condition. UV light can also damage
the paint. You can inspect for UV damage of the paint as follows:
(a) Clean the painted surface with solvent-based cleaner (BASF Prekleeno 900). Wipe
the cleaner off before it dries.
(b) Rub the paint surface with a dark cloth. An excess of white, chalky residue on the
cloth indicates oxidation of the paint due to UV damage. If only a small amount of
residue is found, the paint can be polished smooth. If a large amount of residue is
found, the component should be repainted.
If visual inspection of a metal component indicates possible damage, non-destructive
inspection may be used to check for cracks. Alternately, the part may be replaced.
(2) Tap Test for Composites
Each type of structure makes a distinct sound when tapped with a large coin or washer.
The thicker and more solid the structure, the higher pitch the sound. Areas of delamination,
cracks in overlapping bonds and sandwich panels with underlying damage to the core
sound dull or dead when tapped. The best technique is to tap repeatedly while moving
slowly around the area of interest, listening for changes in the sound. In this way, it is
possible to find the extent of an area of damage.
Tap testing is also useful to find the edges of an area of core, to find underlying bulkheads
or ribs and to find steps in the thickness of solid laminates.
Tap testing is done if visual inspection indicates possible damage. For example, if a
surface dent is found in a sandwich part, tap testing should be used to determine if there is
a disbond between the skin and the core.
(3) Functional or Fit Check
Wear on mating parts can be evaluated by measuring the play between the parts when they
are engaged, such as the fit of the A-Bolt and B-Bolt bushings in the spar bridge.
Time Limits and
Maintenance Checks
DA20-C1 AMM
Page 4
30 Apr 2008 05-20-00 Doc # DA201-C1
Rev. 13
B. Defect Limits for Composites
Diamond Aircraft has established defect limits for inspection of composite airframe components,
refer to Chapter 51-10 for this information.
Contact Diamond Aircraft if damages are determined which cannot be repaired in accordance
with an approved procedures manual.
DA20-C1 AMM
Time Limits and
Maintenance Checks
Doc # DA201-C1
Rev. 13 05-20-00 Page 5
30 Apr 2008
MAINTENANCE PRACTICES
MAINTENANCE CHECKLIST DA20-C1
1. General
Enter the applicable data in the blocks below:
S/N :______________________
Registration :___________________
Date :______________________
Engine hours,
TTSN/TSMOH :___________________
Check :___________________
(50,100, 200, 1000, 6000,
Annual Inspection)
Airplane
Operating Hours. :___________________
At 25 hours time since new of an aircraft, inspect the items in the 100 hour column that DO NOT
have an asterisk (*). Items that do have an asterisks beside may be initialed “N/A @ 25 hr” in the
Initials column.
2. Preparation
Do the following items before you start the applicable check:
Interval (Flight Hours)
Inspection Items 50 100 200 1000 6000 Initials.
1. Before you do the inspection:
Read the applicable Airworthiness
Directives.
x x x x x
2. For airplanes that are not U.S. Registered:
Read the applicable Service Bulletins.
x x x x x
3. Examine the Log Books.
- Do a check of the Technical Records.
Make sure that the mass and static
moment for the ailerons, flaps, elevator
and rudder are within the specified limits.
(Refer to Chapter 06-00)
x x x x x
4. Clean the airplane fully.
(Refer to Chapter 12-30).
x* x x x
* Not applicable at 25 hour inspection.
Time Limits and
Maintenance Checks
DA20-C1 AMM
Page 6
30 Apr 2008 05-20-00 Doc # DA201-C1
Rev. 13
3. Engine Ground Test
Do an engine ground test as follows (complete a copy of the Engine Ground Test Record as part of
the engine ground test (Refer to Paragraph 7).
Interval (Flight Hours)
Inspection Items 50 100 200 1000 6000 Initials.
　
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