I. The damage tolerance principle takes cracking of the structure into account.

II. The safe life principle is based on the replacements of parts after a given number of cycles or flight hours.

I. In structural design, fail safe implies redundant load paths.

II. A safe life structure is based on a declared number of cycles or time period.

l. In structural design, fail safe implies the structure will never fail.

II. In structural design, safe life implies the structure will never fail during a declared time period or number of cycles.

I. In structural design, fail safe implies parallel structural parts.

II. In structural design, safe life implies the structure will never fail during a declared time period or number of cycles.

I. In structural design, fail safe implies the structure will never fail.

II. A safe life structure is based on a declared time period or number of cycles.

1-there is more than one load carrying component.

2-oneload carrying component is sufficient for a given load, provided it is strong enough.

3-the component is removed at the end of the calculated life timeor number of cycles.

4-the design is based on the principle of redundancy of components.

The combination that regroups all of the correct statements is

l. The damage tolerance principle assumes cracks in the structure will never occur.

II. The safe life principle is based on the

Replacement of parts after a given number of cycles or flight hours.

1-there is more than one load carrying component.

2-oneload carrying component is sufficient for a given load,

Provided it is strong enough.

3-the component is removed at the end of the calculated life time or number of cycles.

4-the design is based on the principle of redundancy of components.

The combination that regroups all of the correct statements is