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D. "Second-level" investigation
1) Locate the components) which is (are) causing the incorrect operation pointed out and remove it (them) for general overhaul. Carry out a detailed inspection of the system involved.
2) Locate and accurately assess the structural damage found during the "first-level" investigation.
3) Check the geometry of the airframe.
4) Central section of the wings
a) Carry out a dye-penetrant crack test on all attachment brackets in the central section.
b) Remove attachment bolts, inspect them by magnetic particle crack test and check for distortion (or replace them).
c) Check the bores in the brackets for alignment and ovality.
d) Open the inspection doors and the cowling under hull and carry out a detailed inspection of the front spars for distortion, cracks and slack or missing rivets.
e) Check the attachment and routing of all pipes, cables, supports and linkages.
f) With the pumps running, carry out a pressure test of the complete fuel system and an operational test on valves and selectors.
g) Check the linkages during the operation of the flaps, ailerons and stabilator, rudder and trims.
5) Wings
a) Carry out a dye-penetrant crack test on the wing end attachment brackets.
b) Remove the attachment bolts and carry out a magnetic particle crack test and inspect for distortion. Replace them if necessary.
c) Check the bores in the brackets for alignment and ovality.
d) With the pumps running, carry out a pressure test of the complete fuel circuit and an operational test on valves and selectors.
e) Inspect the control linkages when operating the flaps and ailerons.
f) Visually inspect the compensation tabs.
6) Fuselage
a) Open all inspection doors and panels on the floor and carry out detailed inspection of the fuselage belly structure and all components (supports, stringer, stiffener, etc).
b) Check that all equipment is correctly attached.
AMA
Validity : S / N 1 - 9999 05 50 02 Page 603
(BA) JUN 01
c) Examine the stringers, frames and lateral structure for distortion, cracks or any other faults.
d) Inspect the flight controls linkages during operation.
7) Empennages
a) A detailed inspection of stabilator and rudder control linkages and bellcranks must be carried out.
b) A detailed inspection of horizontal and vertical stabilizers attachment brackets must be carried out.
c) These operations must be carried out in line with the manufacturer's procedures.
d) In all cases, contact the manufacturer for additional investigations and, if necessary, definition or approval of a repair scheme.
WA
Validity : S / N 1 - 9999 05 50 02 (BA) Page
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INSPECTION AFTER LIMITATION OVERSHOOTS
INSPECTION / CHECK
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TB 20 MAINTENANCE MANUAL 05 TIME LIMITS MAINTENANCE CHECKS TB20飞机维护手册 05 时间限制维护检查 2(91)
