737-300/400/500 补充结构检查文件 SUPPLEMENTAL STRUCTURAL INSPECTION DOCUMENT 1(18)

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d)     Input the effective inspection interval N = 100 F/Ro in Block 16. 
STEP 4  Enter the 'DTR vs. N chart in Block 6, with the value of N computed in STEP 3. 
Read the 'DTR value for the line corresponding to the inspection direction and method in Block 11 and Block 13, respectively.  Enter the DTR value in the appropriate row of Block 18. 
STEP 5  Add the 'DTR values in Block 18 to the Fuel Leak DTR given in Block 19, and enter the value in Block 20, Total DTR. 
STEP 6  If the Total DTR equals or exceeds the Required DTR given in Block 21, no further action is necessary until the normal maintenance program for the SSI is changed.  (See Example 1 in Section 7.4). 
STEP 7  If the Total DTR is less than the Required DTR, the inspection program must be modified and/or supplemented.  Typical inspection options that can be used to increase the Total DTR are shown in Section 5.1.6.  The procedure for using each of these options is as follows: 
Option a)  More Intensive Visual Inspection (See Example 2 in Section 7.4) 
For each inspection to be intensified, proceed as follows: 
Enter the horizontal scale of Block 6 with the effective inspection interval N from Block 16. 
Read the 'DTR value for the line corresponding to the intensified visual inspection and the same direction. 
Enter the 'DTR value in the appropriate row of Block 18. 

7.0  DOCUMENT USAGE D6-82669 Original

Option b)
Option c)
Option d)
Option e)
Delete the ΔDTR value and interval for the prior, less intensive, inspection.
When all required changes have been made, repeat STEPS 5, 6, and 7.
Inspection Interval Reduction (See Example 2 in Section 7.4)
For each inspection to have the reduced interval proceed as follows:
Enter the vertical scale of Block 6 with the desired level of ΔDTR.
Read the inspection interval N for the line corresponding to the appropriate

inspection method and direction.
Enter the N value in Block 16 and the corresponding ΔDTR in Block 18.
Delete the ΔDTR for the prior, less frequent, inspection.
When all required changes have been made, repeat STEPS 5 and 6.
Additional Inspections from Other Zones or Directions
Inspection methods, currently not being used from a direction or zone shown

on the DTR Check Form, may be applied to the SSI.  Consequently, these inspections will contribute their corresponding DTR value to the Total DTR (Block 20).
Use of Appropriate NDT Procedures (See Example 2 in Section 7.4) Approved NDT procedures are provided for SSIs that are difficult to inspect visually due to obstructions or poor access.  A line showing the variation of
ΔDTR with N for 100 percent of the eligible airplanes is provided in Block 6 for each NDT procedure. To determine the ΔDTR for an NDT inspection of all eligible airplanes with a
　
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