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to reach 85† C (185† F) as corresponds to an ambient temperature
between 30† C (86† F) and 10† C (50† F).
NOTE: At slow or fast increasing temperature rate, keep 85 ‡3† C
(185 ‡5.4† F) during the last 13 minutes or more of the heating
period.
(8) Remove blankets from the heated area/s.
G. For METHOD C only (refrigerator):
(1) Make sure that the Elevator is removed from the Horizontal Stabilizer
(Refer to AMM, Chapter 27-34-41, Page Block 401).
(2) Use a support tool to put the elevator in a vertical position, with
trailing edge down, so that the two panels are positioned at the same
angle to the floor (Refer to Figure 1004).
(3) Make sure that the ambient temperature inside the refrigerator is
maintained stable at -5º C (23º F) or below.
(4) Put the elevator inside the refrigerator.
(5) Keep the elevator inside the refrigerator during a minimum of 2 hours.
(6) Move the elevator out of the refrigerator to a place away from cold/hot
airflow.
6. INSTRUMENT CALIBRATION
CAUTION: IT IS EXTREMELY IMPORTANT NOT TO TOUCH THE INSPECTION AREA DURING THE
CALIBRATION, INSPECTION OR MARKING PROCESSES.
A. Operate the instrument in accordance with the manufacturer's instructions.
B. Set the power to on and wait approximately 30 seconds.
C. Select Image menu and make sure that temperature range -20† to 120† C (-4† F
to 248† F) is selected.
A318/A319/A320/A321
NONDESTRUCTIVE TESTING MANUAL
PART 10 - THERMOGRAPHIC
ALI NO. 55-20-07
EFFECTIVITY: A318,A319,A320,A321 55-20-07 Page 1015
Nov 01/07
Printed in Germany
D. Select in Set up - Image menu the following parameters:
Auto Adjust : Level and Span
Continuous adjust. : None
Colour scale : METHOD A and METHOD B - Grey inverted
METHOD C - Grey
E. Adjust the monitor controls such that images are shown same shape, grey color,
contrast and brightness on both the thermocamera and monitor screens.
NOTE: No adjustment is needed when the remote control monitor is used.
F. Calibrate the thermocamera as follows:
- For methods A and C during the waiting time
- For method B immediately before the end of the heating period on the lower
panel of the area of inspection
- Also, do this calibration again immediately before the start of the
thermographic inspection.
(1) Point the camera, as perpendicular as possible, to a part of the
inspection area so that:
- Only inspection area is in the viewfinder, so no other items (floor,
walls, etc) are seen in the viewer during calibration
- The trailing edge aligns with the bottom edge of the viewer (Refer to
Figure 1007).
(2) Press button “A” (auto-adjust) to pre-adjust the camera.
(3) Adjust the focus to clearly define any discontinuity in the area
(fasteners, hoisting point, rib, or other discontinuity).
(4) Do the automatic contrast and brightness calibration by pressing
button ”A”.
(5) If necessary, move the camera away to a distance between 1000 mm and
2000 mm (39.37 in. and 78.74 in.), from the inspection area and re-focus
the thermocamera.
A318/A319/A320/A321
NONDESTRUCTIVE TESTING MANUAL
PART 10 - THERMOGRAPHIC
ALI NO. 55-20-07
Calibration-Correct / Incorrect area in the viewer
Figure 1007
EFFECTIVITY: A318,A319,A320,A321 55-20-07 Page 1016
Nov 01/07
Printed in Germany
A318/A319/A320/A321
NONDESTRUCTIVE TESTING MANUAL
PART 10 - THERMOGRAPHIC
ALI NO. 55-20-07
EFFECTIVITY: A318,A319,A320,A321 55-20-07 Page 1017
Nov 01/07
Printed in Germany
7. INSPECTION PROCEDURE
CAUTION: PERFORMANCE OF THE INSPECTION CAN ONLY BE ENSURED IF ALL CALIBRATION AND
HEATING/COOLING PARAMETERS ARE CAREFULLY FOLLOWED.
CAUTION: IT IS EXTREMELY IMPORTANT NOT TO TOUCH INSPECTION AREA DURING THE
CALIBRATION, INSPECTION OR MARKING PROCESSES.
CAUTION: IT IS ESSENTIAL THAT THE INSPECTOR IS MADE AWARE OF THE ELEVATOR
STRUCTURE LAYOUT BEFORE PERFORMING THIS INSPECTION.
NOTE: Two people are necessary to perform this procedure: one inspector and one
assistant. The assistant will scan the inspection areas and the inspector
will mark out the panel trapped water areas.
A. Calibrate the equipment in accordance with paragraph 6.
B. Repeat paragraph 6.F. adjustment just before starting the inspection.
C. For METHOD A only (oven)
CAUTION: START THE THERMOGRAPHIC INSPECTION 8 MINUTES AFTER THE END OF THE
THERMAL EXCITATION (HEAT/COLD) APPLICATION.
CAUTION: CHECK THAT GREY INVERTED POLARITY (HOT/BLACK) HAS BEEN SELECTED IN
THE COLOUR SCALE BY LOOKING AT HOISTING POINTS, FASTENERS OR RIB IN
　
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