MIL-HDBK-3F Volume 3,Chapter 4 Building Block Approach for Composite Structures TABLE 4.4.1.1(a)DOD/NASA aircraft structure classification vs.PMC allowables data requirements for prototypes(Reference 4.4.1.1). PART A (From Figure 4.4.1.1) Aircraft Structure Classification Allowable Data Requirements for Prototype Design Classification Description Preliminary(Tape/Fabric) Final (Tape/Fabric) PRIMARY CARRIES PRIMARY AIR LOADS Based on ·Fracture critical Failure will cause loss of 1. Estimates using data on 1-lot materials testing:5 to 8 (F1C) vehicle similar materials and replicates per test type(static) experienc8..… Noncritical(N/C) Failure will not cause loss of 2 Vendor Data 1-lot materials testing:4 to 6 vehicle 3. Journals,magazines and replicates per test type(static) books SECONDARY CARRIES SECONDARY AIR Based on OTHER LOADS ·Fatigue critical Failure will not cause loss of 1. Estimates using data on same 1-lot materials testing:3 to 4 (FA/C)&economic vehicle but may cause cost or similar materials replicates per test type (static) life critical (EC) critical parts replacements plus fatigue testing ·Noncritical(N/C) Failure will not cause loss of 2.Vendor data Use legitimate,verified data vehicle 3. Journals,magazines and bases No cost or fatigue critical parts books NONSTRUCTURAL NON-OR MINOR LOAD Based on BEARING ·Noncritical(N/C) Failure replacement of parts 1.Estimates using data on Estimates using data on similar causing minor inconvenience, similar materials,or materials,or not cost critical 2. Vendor data,or Vendor data,or 3. Journals,magazines and Journals,magazines and books books 4-8MIL-HDBK-3F Volume 3, Chapter 4 Building Block Approach for Composite Structures 4-8 TABLE 4.4.1.1(a) DOD/NASA aircraft structure classification vs. PMC allowables data requirements for prototypes (Reference 4.4.1.1). PART A (From Figure 4.4.1.1) Aircraft Structure Classification Allowable Data Requirements for Prototype Design Classification Description Preliminary (Tape/Fabric) Final (Tape/Fabric) PRIMARY CARRIES PRIMARY AIR LOADS Based on • Fracture critical (F/C) • Failure will cause loss of vehicle 1. Estimates using data on similar materials and experience 1 - lot materials testing: 5 to 8 replicates per test type (static) • Noncritical (N/C) • Failure will not cause loss of vehicle 2. Vendor Data 3. Journals, magazines and books 1 - lot materials testing: 4 to 6 replicates per test type (static) SECONDARY CARRIES SECONDARY AIR & OTHER LOADS Based on • Fatigue critical (FA/C) & economic life critical (EL/C) • Failure will not cause loss of vehicle but may cause cost critical parts replacements 1. Estimates using data on same or similar materials 1 - lot materials testing: 3 to 4 replicates per test type (static) plus fatigue testing • Noncritical (N/C) • Failure will not cause loss of vehicle • No cost or fatigue critical parts 2. Vendor data 3. Journals, magazines and books Use legitimate, verified data bases NONSTRUCTURAL NON- OR MINOR LOAD BEARING Based on • Noncritical (N/C) • Failure replacement of parts causing minor inconvenience, 1. Estimates using data on similar materials, or Estimates using data on similar materials, or not cost critical 2. Vendor data, or Vendor data, or 3. Journals, magazines and books Journals, magazines and books