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STEP 6

Last Time Buys & Stockpiling

Publishing Date: 08-Oct-2025

Read Time: In-depth guide | <20 minutes

Reviewer: Christoph Horlebein, CEO Horlebein Consulting

LTBs can prevent redesigns and ensure continuity—but they come with hidden costs. This step explores how to calculate LTB quantities, weigh redesign vs. stockpiling, and apply models like Porter Refresh and MOCA. Learn how to store, monitor, and preserve LTB inventory to avoid degradation, waste, and compliance risks. 

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Author: John Wombwell (MD, CNX Technology and Innovation Group) 

Theme

Standard & Clause

LTB / Life of Need Buy Definition & Use

IEC 62402 §10.3 • SD-22 §4.4

Notification Handling (PCN, PDN, NRND)

IEC 62402 §9.2 • SD-22 §3.3

LTB Quantity Calculation & Service

Obligations

IEC 62402 §10.3 • SD-22 §4.4

Cost Analysis (NPV, Porter Model)

IEC 62402 §11.2 • SD-22 §4.4

Stockpiling & Storage Requirements

IEC 62402 §10.3; Annex C • SD-22 §4.4

Compliance Monitoring During Storage

IEC 62402 §4.1; §8.10 • SD-22 §4.3

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About the author

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John Wombwell

John Wombwell, founder of CNX Technology and Innovation Group, has over 25 years of experience in Component Engineering and Obsolescence Management. A Royal Air Force veteran, his career spans work with radar, missile, and communication systems across defense, medical, and rail industries worldwide. Now focused on advancing proactive obsolescence management, John shares his expertise through CNX as initiator of the 12 Steps framework and the International Institute of Obsolescence Management.

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