A typical sequence for inspection of all 10 eligible airplanes within successive 20,000 flight cycle intervals (N) is shown on Page 7.0.29.
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7.4.3 EXAMPLE 3
SSI - HORIZONTAL STABILIZER REAR SPAR UPPER CHORD
EXISTING MAINTENANCE ON 36 AIRPLANES (10 ELIGIBLE AIRPLANES):
EXTERNAL GENERAL VISUAL AT C-CHECKS EVERY 2,000 FLIGHT CYCLES.
INTERNAL GENERAL VISUAL AT 4C-CHECKS EVERY 8,000 FLIGHT CYCLES.
REQUIRED DTR = 6
ITEM EX-3 IS SUBDIVIDED TO COVER TWO CRACKING PATTERNS:
EX-3A COVERS A LEAD CRACK IN EITHER HORIZONTAL FLANGE OF THE REAR SPAR CHORD.
EX-3B COVERS A LEAD CRACK IN THE HORIZONTAL FLANGE OF EITHER THE FORE OR AFT FAIL-SAFE ANGLE.
(The inspection program must give a DTR equal to or greater than required for both EX-3A and EX-3B).
7.4.3.1 Existing Maintenance The completed DTR Check Forms are shown on Pages 7.0.33 (EX-3A(I)) and 7.0.34 (EX-3B(I)). In both cases, the total DTR is less than the Required DTR; therefore, the existing maintenance
program must be changed or supplemented.
The easiest change for the operator is to intensify the visual inspections.
7.4.3.2 Inspection Intensity Changed to Detailed Instead of General Visual The completed DTR Check Forms are shown on Pages 7.0.35 (EX-3A(II)) and 7.0.36 (EX-3B(II)). For EX-3A, the total DTR of 1.2 is insufficient to meet the Required DTR of 6. For EX-3B, the total DTR of 12 exceeds the Required DTR of 6; Therefore, this program change is
acceptable for this cracking pattern.
Two NDI procedures have been developed for this SSI; high frequency eddy current (HFEC) of the
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