Understanding where MIL-STD-167-2A fits among related standards prevents misapplication:

| Standard | Focus | Typical Use Case | | :--- | :--- | :--- | | MIL-STD-167-2A | Shipboard environment (low freq vibration) | Pumps, motors, hull-mounted electronics | | MIL-STD-810H (Method 514.8) | General military environmental vibration | Ground vehicles, aircraft, portable gear | | MIL-STD-901D | High-impact shock (barge or lightweight test) | Combat systems, valve operators, critical switches | | NAVSEA 0908-LP-507-7000 | Test sequencing for naval ship systems | Integration of above standards |

If your equipment is destined for a submarine, additional considerations apply. Submarines often reference MIL-STD-167-2A but with tighter amplitude limits due to acoustic stealth requirements.

The standard mandates a resonance search before and after the endurance test. If natural frequencies of components (circuit boards, relays, brackets) fall within the operating range, they must withstand 30-minute resonance dwells.

The standard mandates a resonance search before, during, and after a durability run. If resonances exist within the equipment’s operating frequency range, the test must dwell at those resonant frequencies for a specified duration (typically 2 hours per resonance) to simulate fatigue life.

Many professionals confuse the two versions. While both cover vibration, MIL-STD-167-1 focuses on the vibration generated by the equipment itself (emissions). In contrast, MIL-STD-167-2A governs how equipment withstands vibration coming from the ship’s environment (immunity). Specifically, Type I of MIL-STD-167-2A addresses the low-frequency, high-amplitude vibration typical of ship hulls and propulsion systems.

A compliant test report should include the following sections:

If you are reviewing a supplier’s MIL-STD-167-2A PDF test report, ensure the report issuance date is within the last five years; older reports may reference superseded paragraphs.

When you finally open your mil-std-167-2a pdf, you will find detailed test curves. Here are the critical performance requirements you must program into your shaker table.

This is a sine sweep test. The equipment is vibrated through a frequency range to simulate hull vibration.

  • Dwell: At any resonance frequencies, dwell for 30 minutes at that frequency.