3) A 10 MHz, 0.125 inch diameter (3.2 mm), 0 degree transducer. Case dimensions: 0.14
inch diameter (3.6 mm) by 0.6 inch long (15 mm). Part number: 389-003-810.
Manufacturer: Krautkramer Branson.
NOTE: Transducers of frequencies between 5 MHz and 12 MHz can be used if they
can be calibrated with the instrument as specified in Paragraph 4.
(3) Reference Standards - Make Reference Standards NDT4107 and NDT4108 as specified in
Figure 2 and Figure 3.
(4) Transducer Guides NDT4108/9-G3, NDT4108/9-G4 & NDT4107-G5. See Figure 4.
(5) Couplant - All ultrasonic couplants that will not cause damage to the airplane structure can be
used. Commercial grease or oil can be used if the sensitivity requirements of Paragraph 4. are
satisfactory.
3. Prepare for the Inspection
A. Access the aft end of the outboard diagonal brace through the fairing access doors. Remove the fairing
that is aft of the fairing access doors to access the aft end of the inboard diagonal brace. See Figure 1.
B. Remove the fuse pin secondary and primary retention caps to get access to the inspection surfaces of
the fuse pins. See Figure 1.
C. Remove all paint and sealant from the ends of the fuse pins and clean fully. Use a non-abrasive
scraper to remove the paint. The part number is etched on the end of the fuse pin and can cause the
surface to be rough. If necessary, lightly sand this area by approved methods to permit the transducer
to fully touch the part.
NOTE: Make sure that the part number is not removed when you sand the fuse pin.
D. Identify the part number of the pin to be examined.
4. Instrument Calibration
NOTE: A transducer guide is used during this inspection because of the small transducer size.
A. Find the part number of the fuse pin to be examined in Table 1 and use Table 1 to see what reference
standard, transducer and transducer guide to use.
B. Connect the transducer to the instrument and do the initial adjustments of the instrument.
NOTE: Do not use reject unless the instrument has certified linear reject. Do not use more than 10%
reject.
C. Set the instrument frequency to 10 MHz. See Paragraph 2.A.(1).
D. Put the transducer into the transducer guide so that the bottom of the transducer is equal with the
bottom of the hole. Tighten the setscrew lightly. See Figure 5 or Figure 6 as applicable.
E. Put couplant on the reference standard at position A and then put the transducer at this position. See
Figure 5 or Figure 6 as applicable.
F. Adjust the instrument controls to get the first two back surface signals at 40% and 80% of full screen
width. The instrument's screen range is now calibrated. See Figure 5 or Figure 6 as applicable.
G. Put couplant on the reference standard. Put the transducer on the reference standard above the
reference notch at the position shown in Table 1. See Figure 7 or Figure 8 as applicable.
H. Move the transducer guide above the reference notch to get a maximum signal from the reference
notch. The signal from the notch will be shown on the screen at the position shown in Table 1. See
Figure 7 or Figure 8 as applicable.
747
NONDESTRUCTIVE TEST MANUAL
PART 4 54-30-06
Page 2
Nov 15/2015D6-7170
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
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