Boeing 747 - Page 29

GUIDE POSITION FOR CALIBRATION ON STEP "A"
SURFACE SIGNAL AT STEPS "B" AND "C".
FOR THE CORRECT LOCATION OF THE BACK
TRANSDUCER ON STEP "A". SEE TABLE 1
FIRST BACK SURFACE SIGNAL WITH THE
GUIDE
TRANSDUCER
INSTRUMENT SENSITIVITY CALIBRATION
C
B
USE EQUIVALENT POSITIONS FOR STEP "B" AND
STEP "C"
(VIEW ROTATED 90 DEGREES COUNTERCLOCKWISE)
A-A
A
NDT4106
REFERENCE STANDARD
TRANSDUCER
AND ADJUST THE SETSCREW SO IT IS TIGHT
MAXIMUM SIGNAL FROM THE REFERENCE NOTCH
TURN THE TRANSDUCER IN THE GUIDE TO GET A
THAN 8% FULL SCREEN WIDTH
INITIAL PULSE SIGNAL MUST NOT BE LARGER
MODE CONVERSION SIGNAL
INITIAL PULSE SIGNAL
SIGNALS FROM MODE CONVERSION
EDM NOTCH SIGNAL FROM STEP "A"
EDM
NOTCH SIGNAL FROM STEP "B"
EDM
NOTCH SIGNAL FROM STEP "C"
____
NOTE:
60%
40%
20%
100%
10 0
8
6
2
4
80%
9
A A
9
8
7
5
2
1
4
3
6
4
8
2
5
63
1
7
ON
OFF
10P
10N
0
0
20 40
60
E
D
U
A
+5
+1
2.25
5
1
OFF
P
/
4 6 8
10
20
0
2
4
6
8
10
%
2130620 S0000459156_V1
Reference Notch Sensitivity Calibration
Figure 5
747
NONDESTRUCTIVE TEST MANUAL
PART 4 54-30-05
Page 9
Nov 15/2015D6-7170
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
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