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condition of the airplane and the engine. It is important for flight safety. Look in the airplane
log-book for problems before doing the pre-flight check.
WARNING: DO ALL THE STEPS OF THE PRE-FLIGHT CHECK CAREFULLY.
ACCIDENTS CAN OCCUR IF THE PRE-FLIGHT CHECK IS NOT DONE
CORRECTLY.
The schedule for the pilots pre-flight check is in the Flight Manual for the DA20-C1.
3. Post-Flight Check
Do the post-flight check after the last flight of the day. The post-flight check includes all the steps of
the pre-flight check.
You must also:
Refuel the airplane (Chapter 12-10).
Record in the log book each problem found in flight and during the post-flight check.
Park the airplane (Chapter 10-00 and 10-10).
If necessary, moor the airplane (Chapter 10-20).
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CHAPTER 05-50
UNSCHEDULED MAINTENANCE CHECKS
1. General
Unscheduled maintenance checks are necessary after any incident that could cause damage to the
airplane.
2. Hard Landing Check
Figure 1 shows the hard landing check areas. You must do a hard landing check when the pilot
makes a report of a hard landing. Or when ground handling applies unusual loads.
A. Equipment
Item Quantity Part No
Slide sheets 4 Commercial
B. Procedure
Maintenance Work References/Key Items
Examine the landing gear fittings. Look
especially for cracks.
Use a mirror and a flashlight.
Examine the fuselage structure where the
landing gear attaches. Look especially for:
− Delamination of the GFRP structure.
− Damage to the mounting brackets.
Chapter 32-10
Examine the landing gear struts. Look
especially for:
− Bending
− Cracks.
Chapter 32-10
Do a test of the wheel tracking. Chapter 32-10
Examine the tires. Look especially for cuts in
the side walls.
Chapter 32-40
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Figure 1. Hard Landing Check Areas
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Maintenance Work References/Key Items
6 Examine the brake discs. Look especially for
damage. Turn the wheel and make sure the
disc is not bent.
7 Examine the nose-gear assembly. Look
especially for deformation of the upper cross
bar of the engine mount.
8 Examine the top-hat contour in the bottom of
the fuselage for delamination. Look
especially in the area of the bearings for the
nose-gear assembly.
9 Remove the load from the nose-gear and
examine it. Look especially for more than the
usual play.
10 Examine the control surfaces. Look
especially for:
− Correct attachment of the hinges.
− Correct attachment of the mass balance
to the structure.
11 Examine the leading edge of the wing for
damage.
12 Examine the leading edge of the horizontal
and vertical stabilizers for damage.
13 Examine the area of the spar attachment.
Look especially for cracks.
14 Examine the engine mounts.
15 Examine the engine mount points on the
firewall.
16 Examine the propeller. Look especially to
see if the propeller touched the ground.
CAUTION: IF YOU THINK THE AIRPLANE HAS DAMAGE TO AN AREA
THAT TRANSMITS A LOAD. YOU MUST ASK THE AIRPLANE
MANUFACTURER FOR ADVICE.
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3. Propeller Strike
A propeller strike can be a moving propeller (engine running) which has hit a solid object. Or it can
be a moving object that hits a propeller that is not moving.
If the engine is stopped when the propeller hits a solid object:
− Remove the engine (Refer to Chapter 71-00-00).
− Do a shock-load test (Refer to the TCM Service Bulletin 96-11).
− Do an inspection of the mounting frame (Refer to Chapter 71-20).
− Do an inspection of the propeller (Refer to the Hoffmann propeller Owner’s Manual
(number E 0110.74).).
If a propeller which is not moving is hit by a moving object:
− Do an inspection of the propeller (Refer to the Hoffmann propeller Owner’s Manual
(number E 0110.74).).
− If the propeller must be removed to do a repair other than minor dressing of the blades, you
　
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