UNCLASSIFIED / FOR OFFICIAL USE ONLY / UNCLASSIFIED

Department of Defense • Military Standard

MIL-STD-810 (USAF)

Environmental Test Methods
for Aerospace and Ground Equipment

This standard establishes uniform minimum requirements for environmental test
methods applicable to aerospace vehicles and ground equipment. Supersedes
MIL-STD-810, 14 June 1962. Distribution: Approved for public release.

SUPERSEDED

Document Number MIL-STD-810 (USAF)

Date 14 JUNE 1962

Preparing Activity USAF / AFSC / AFFTC

FSC / FSG MFFP 1990-A

1. Scope

1.1 This standard establishes environmental test methods for equipment intended for use in aerospace and ground environments as defined herein. The test methods herein shall be used to determine compliance with equipment specifications and shall not be used as design specifications.

1.2 This document is applicable to all aeronautical and ground support equipment procured by or for the Department of Defense. It supersedes prior documents issued under the authority of the respective Services where such documents conflict with the requirements herein stated.

2. Referenced Documents

MIL-E-5272 — Environmental Testing, Aeronautical and Associated Equipment, General Specification For
MIL-T-5422 — Testing, Environmental, Aircraft Electronic and Associated Equipment
MIL-STD-781 — Reliability Tests: Exponential Distribution

Marine Hardware Circa 1960s Canada

W.J. Keating Blocks — Still in the Catalog

Bob Dibblee

W.J. Keating Tufnol block tackle naval marine supply Canada 1960s

W.J. Keating Tufnol block, circa 1960s. NSN 3940-00-521-2794 remains an active catalog item.

This is a W.J. Keating block — a wood shell tackle block built for naval and marine service in the admiralty pattern. The shells are ash, and the sheave is Tufnol, a phenolic laminate chosen for its resistance to saltwater and its low friction on rope. Wood is the economical choice for the shell; Tufnol is the premium material — at roughly ten times the cost of wood — specified where the application demands it.

What makes this particular block interesting is that it is still a live product. NSN 3940-00-521-2794 — BLOCK TUFNOL 2M1209 W J KEATING P/N K1990-3-1 — appears in our NATO Stock Number catalog under FSC 3940, Blocks, Tackle, Rigging & Slings. Alongside it are dozens of other WJK part numbers we have supplied over the decades: snatch blocks, double-sheave blocks, wire-rope tackle, and more. The part numbers have not changed. The demand has not gone away.