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Level of Repair Analysis (LORA) Challenge

November 30, 2012

I would like to share my lesson learned from many years of Integrated Logistic Engineering in the Electronics Defense industry.

One of the main goals is to have the best LORA report before a new system is fielded. There are a few challenges when developing a new system LORA.

  1. Unknown field reliability for spare parts and consumables.
  2. 2. Unknown future cost for spares and consumables.
  3. Support Equipment (SE) for LRU & SRU may not be designed yet.

World class design objective is to develop reliable system with minimum foot print:-

  1. All fielded spares are consumables ( very high reliability, unrepairable  and low cost)
  2. No need (or minimum) for field SE or special tools
  3. Minimum Operation & Support (O&S) documentation needed.
  4. Minimum Operation & Support (O&S) Training needed.
  5. Two level maintenance, O/L and Depot.

Unfortunately these objectives are hard to achieve and may be verified only after deployment.

To verify the new design meets system requirements the supplier uses high cost sophisticated test equipments that should not be used in the field.

The developer / manufacture (supplier) shoot for high production yield and try to save time by verifying each part not separately but at system level proof of design.

At this situation the preferable way to address LORA is using COMPSS STAT tool.  During the design stage the system configuration, LRU, SRU, parts and consumables data are inputted to the COMPASS tool. Engineering estimates (reliability, parts cost, SE cost, documentation cost and training cost) are also inputted. By taking this approach we will have an idea regarding the system Life Cycle Cost (LCC) and there is still possibility to influence the system configuration to drive down the system LCC.

The next steps, as the development proceeds and after deployment will be to periodically update the COMPASS STAT with better data and refined maintenance tasks at each repair level including distribution of spares and consumables.

See below system design process with Integrated Logistics Support (ILS) Engineering roll.

ILS engineering process

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