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MIL-HDBK-338B — Electronic Reliability Design
Source: DoD MIL-HDBK-338B (US Government work, public domain; Distribution Statement A) | Chapters: 9
When to use
Reach for this pack when designing or reviewing electronic/hardware reliability programs grounded in MIL-HDBK-338B — especially reliability requirements and allocation, parts derating, prediction caveats, FMEA/FTA, testability, FRACAS, and reliability growth/demonstration strategy. Use it to brief design teams on inherent reliability levers and to structure analytical and test feedback loops.
Prerequisites: none — plain Markdown; no MCP server, API key, or licence tier needed at runtime.
How to Use This Skill
- Without arguments — load the core frameworks below.
- With a topic — ask about MTBF/availability, allocation/prediction, derating, fault tolerance, FMEA/FTA, growth testing, FRACAS, or testability.
- With a chapter — ask for
ch01 through ch09.
Supporting files: glossary.md, patterns.md, cheatsheet.md.
Guidance only. 338B states it is not to be cited as a requirement. Synthesize practices; do not paste annex reliability tables or third-party standard text.
Core Frameworks & Mental Models
Inherent reliability is a design output
Once the design (parts, stresses, architecture) is approved, inherent reliability is largely fixed. Parts, derating, circuit design, and fault tolerance set that ceiling before test.
Spec, allocate, model, predict
Quantitative requirements with environment; allocation tree; reliability model matching architecture; prediction with explicit method/assumptions; refresh when design changes.
R/M/A and system effectiveness
Reliability, maintainability, and availability metrics (including MTBF/MTTR-class measures) feed system effectiveness. Know whether you discuss inherent or operational measures.
Analysis pair: FMEA/FMECA + FTA (+ SCA when needed)
Inductive failure mode analysis for breadth; deductive fault trees for critical top events; sneak circuit analysis for latent paths without part failure.
Empirical loop: FRACAS + demonstration/growth
Data collection and closed-loop corrective action; choose growth (design still plastic) vs demonstration (frozen design decision test); accelerated tests need physics-aware reading.
Testability as a reliability property
Detection/isolation provisions and design-review gates make predicted reliability verifiable in integration and field use.
Chapter Index
| # | Section | Key content |
|---|
| ch01 | R/M/A Theory Foundations | Distributions, failure modeling, MTBF/MTTR/availability, Bayesian notes |
| ch02 | Spec, Allocation, Prediction | Requirements, apportionment, models, prediction methods |
| ch03 | Parts Management & Derating | Parts control, electronic/mechanical derating |
| ch04 | Circuit Design & Fault Tolerance | Robust circuits, redundancy, fault-tolerant design |
| ch05 | Environment & Human Reliability | Environmental design, human performance reliability |
| ch06 | FMEA/FTA/SCA | FMEA/FMECA, fault trees, sneak circuits |
| ch07 | Reviews, Testability, Safety Link | Design reviews, DFT/BIT, safety program interface |
| ch08 | Data, FRACAS, Demo & Growth | Data uses, FRACAS, demonstration, growth, accelerated test |
| ch09 | Systems Reliability Engineering | Effectiveness, system R&M parameters, COTS/NDI |
Topic Index
- Allocation / apportionment → ch02
- Availability (inherent vs operational) → ch01, ch09
- BIT / diagnostics → ch07
- COTS / NDI reliability → ch09
- Derating → ch03
- Environmental stress design → ch05
- Failure distributions / Weibull / exponential → ch01
- Fault tolerance / redundancy → ch04
- Fault tree analysis (FTA) → ch06
- FMEA / FMECA → ch06
- FRACAS → ch08
- Human performance reliability → ch05
- MTBF / MTTR → ch01, ch02
- Parts management → ch03
- Physics-of-failure / stress drivers → ch05, ch03
- Reliability demonstration → ch08
- Reliability growth testing → ch08
- Reliability prediction → ch02
- Sneak circuit analysis → ch06
- System effectiveness → ch09
- Testability / DFT → ch07
Supporting Files
Scope & Limits
This pack covers selected design-guidance material from MIL-HDBK-338B (1 Oct 1998; Notice 2 keeps active) — R/M/A theory, specification/allocation/prediction, core Section 7 design guidelines (parts through safety interface), reliability data/FRACAS/demonstration/growth, and systems reliability engineering. Extraction metadata reports 1046 PDF pages for the nde-ed.org mirror copy (DLA catalog often cites ~716 content pages; PDF page objects can differ). It does not reproduce large annex part-stress/reliability tables, full worked numerical appendices, or third-party standards quoted inside 338B. Guidance only — not contractual requirements text. US Government public domain work (Distribution Statement A). No source-material download link is published.