Section 220.127.116.11.8. Analysis of Remaining Structure Subsequent to Load Path Failure
The fail safe characteristics of this structure, i.e., the
ability to fail panel and fly safely until
the failed panel is detected, depends upon the residual strength capability at
the time of and subsequent to load path failure and the capability of and
frequency of in-service inspections.
The remaining structure guidelines are specified in JSSG-2006 paragraph
As stated earlier, the fail safety will be supported by walk-around-visual
inspections for damage sizes on the order of a failed load path. Generally, the walk-around-visual inspection
can be aided by detectable signs such as fuel leakage. At any rate, the minimum inspection
capability for this example will be considered to be a failed load path.
The damage as illustrated in Figure 1.3.17 shall not grow to a
size such as to cause loss of the wing due to the application of PVW in 5 times the inspection
interval (10 flights), i.e. in 50 flights.
This is illustrated in Figure 1.3.20. The load Pxx
= Pyy will generally be less than the design limit condition and
Pyy (as discussed in
Section 2.5) will always be equal to or greater than that associated with the
design limit condition.
1.3.20. Illustration of
Damage-Growth Limits and Strength Guidelines; Remaining Structure Subsequent to