Budgets - E-8

Budgets are a status report of the physical and operational characteristics of the product at a given moment in time. They are living documents that are updated almost in real time. This permanent updating means that it possible to check, at any time, that the budgets assigned to the product are being observed.

According to the project progress phases, product budgets shall be estimated (phase A), calculated (phases B/C) or measured (phases C/D).

They shall be established for the following areas:

• performance,
• mass, balance, inertia,
• power ratings,
• thermal,
• telemetry / telecommand,
• computer load,
• dating,
• fluids / consumables.

They shall be prepared according to the following three phases.

1. Inventory of components

All the known components of the product, that have an effect on the budget, shall be listed from the product tree (see M 5).

2. Data collection

For each component in the inventory, the data necessary for preparing the budget shall be collected from the available technical documentation:

• the Definition File (DD) (see E 4) for the intrinsic characteristics of the component;
• the Technical Specification (STB) see E 2) for the specified characteristics;
• the Interface Verification File (DCI) (see E 5).

3. Summary

The budget is the result of a summary of the data collected for all the components.

The power budget shall be established for each of the components (equipment items / subsystems / subassemblies) of the product concerned, according to the various operating modes identified for the equipment concerned.

It shall be unambiguously stated whether the budget concerns mean power or maximum power.

Mass budget - EF-3

Power budget - EF-4