The Boeing Standard (STD) numbering system is the reference framework that Boeing uses to identify and specify maintenance tooling across its entire commercial aircraft product line. For MRO engineers and procurement professionals, understanding how the system works is a prerequisite for using it efficiently.
Each Boeing STD tool is assigned a unique STD number — a sequential integer prefixed with "STD". STD-1, STD-77, STD-1309 — the number itself carries no encoded information about the tool's function, category, or applicable platform. It is simply a unique identifier that, when looked up in Boeing's maintenance documentation, resolves to a precise description of the tool and its intended use.
The description associated with each STD number is the critical element. It specifies the tool's function, its key technical parameters, and any relevant standards or specifications it must meet. For example, STD-77 is described as "Air Source, Regulated — Dry Filtered, 0–50 psig" — a description that defines both the tool's function (regulated dry filtered air source) and its operating range (0 to 50 psig). An engineer searching for this tool needs to match both the STD number and the description to ensure they have the correct item.
STD tools are referenced in Boeing's Aircraft Maintenance Manuals (AMM) by their STD number. When a maintenance task requires a specific tool, the AMM will specify the STD number, and the engineer must obtain the exact item. The STD number is the link between the maintenance procedure and the physical tool.
One important characteristic of the STD system is its platform applicability. A single STD tool may be applicable to multiple Boeing aircraft types. STD-77, for example, is used across the 737 Classic, 737NG, 737 MAX, 747, and several other platforms. This cross-platform applicability reflects the commonality in Boeing's maintenance tooling philosophy — where the same tool can serve the same function across different aircraft generations.
For procurement purposes, the STD number is the primary search parameter. Jazari Aerospace's catalogue is organised by STD number, allowing engineers and procurement teams to search directly for the tool they need. Each catalogue entry includes the full STD description and the list of applicable Boeing platforms, providing the information needed to confirm the correct item before submitting a request for quote.