---
title: "PDM4 Obsolescence Recovery"
ocid: "ocds-h6vhtk-054840"
canonical_url: "https://d3tenders.com/contract/?ocid=ocds-h6vhtk-054840"
markdown_url: "https://d3tenders.com/contract/ocds-h6vhtk-054840.md"
json_url: "https://d3tenders.com/contract/ocds-h6vhtk-054840.json"
source: "Find A Tender Service"
current_stage: "Planning"
buyer: "DEFENCE EQUIPMENT AND SUPPORT"
published: "2025-06-24"
---

# PDM4 Obsolescence Recovery

Buyer: DEFENCE EQUIPMENT AND SUPPORT  
Current stage: Planning  
OCID: ocds-h6vhtk-054840

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## Summary

The Defence Equipment and Support organisation, a public authority under central government, is planning a procurement process titled "PDM4 Obsolescence Recovery." This tender addresses high-risk obsolescence issues for the Platform Data Management System 4 (PDM4) used in Vanguard Class Submarines. It falls under the industry category of navigation equipment and is located in the United Kingdom. The process is currently in the planning stage, with a scheduled contract period from 30th November 2025 to 30th November 2027. A future notice date is set for 31st July 2025. Organisations interested in supplying goods above the threshold value of GBP 2,634,000 may consider this opportunity.

This procurement offers significant business growth opportunities, especially for small and medium-sized enterprises (SMEs) equipped to address critical obsolescence issues like Power Supply Units and PEC SIOs. Companies specialising in maritime navigation equipment and obsolescence recovery services may find this tender well-suited to their capabilities. Engaging in this tender could provide substantial revenue potential and the opportunity to establish long-term relationships with Defence Equipment and Support, enhancing one's reputation in the industry.

## Notice

There is a requirement for the Maritime Command & Control, Targeting, Navigation, and Communications Team (C2TNC) within Sense, Decide and Communicate (SDC) to provide obsolescence recovery for the Platform Data Management System 4 (PDM 4) fitted to Vanguard Class Submarines. PDM In-Service Support is currently provided through contract CSA/3049. PDM4 has been in operation since the early 1990s with an expected in-service period until 2015. The original Out of Service Dates (OSD) has been extended by up to 100%, and no provision of additional stores was made when the OSDs were extended. As a result, work is now required to address the high-risk obsolescence issues, where there are low stores and items which require regular Survey and Repair. Failure to do this will adversely impact the operational capability of the CASD Vanguard Class Submarines. Currently the two main areas of concern are (1) Power Supply Units (PSUs) of which there are three variants and (2) PEC SIOs. Both items are critical to the safe operation of PDM4.

## Key Details

| Field | Value |
| --- | --- |
| Publication source | Find A Tender Service |
| Latest notice | https://www.find-tender.service.gov.uk/Notice/034705-2025 |
| Notice type | UK1 - Pipeline Notice |
| Procurement type | Standard |
| Procurement category | Goods |
| Procurement method | Not Specified |
| Procurement method details | Not specified |
| Tender suitability | SME |
| Awardee scale | Not specified |
| All stages | Planning |

## Dates

| Field | Value |
| --- | --- |
| Publication date | 24 Jun 2025 |
| Submission deadline | Not specified |
| Future notice date | 31 Jul 2025 |
| Award date | Not specified |
| Contract period | 30 Nov 2025 - 30 Nov 2027 |
| Recurrence | Not specified |

## Values

| Field | Value |
| --- | --- |
| Tender value | £2,634,000 |
| Lots value | Not specified |
| Awards value | Not specified |
| Contracts value | Not specified |

## Status

| Field | Value |
| --- | --- |
| Tender status | Planned |
| Lots status | Planned |
| Awards status | Not specified |
| Contracts status | Not specified |

## Buyer

| Field | Value |
| --- | --- |
| Main buyer | DEFENCE EQUIPMENT AND SUPPORT |
| Locality | BRISTOL |
| Post town | Bristol |
| Postcode | BS34 8JH |
| Country | England |
| ITL 1 | TLK South West (England) |
| ITL 2 | TLK5 West of England |
| ITL 3 | TLK52 Bath & North East Somerset and South Gloucestershire |
| Local authority | South Gloucestershire |
| Electoral ward | Stoke Park & Cheswick |
| Westminster constituency | Filton and Bradley Stoke |
| Delivery location | Not specified |

## CPV Codes

### Divisions

- 34 - Transport equipment and auxiliary products to transportation

### Codes

- 34933000 - Navigation equipment

## Release History

- 24 Jun 2025 at 11:33 - PlanningUpdate - UK1 - Pipeline Notice - https://www.find-tender.service.gov.uk/Notice/034705-2025
- 13 Jun 2025 at 09:39 - Planning - UK1 - Pipeline Notice - https://www.find-tender.service.gov.uk/Notice/032174-2025

## Documents

- https://www.find-tender.service.gov.uk/Notice/034705-2025
  24th June 2025 - Pipeline notice on Find a Tender
- https://www.find-tender.service.gov.uk/Notice/032174-2025
  13th June 2025 - Pipeline notice on Find a Tender

## Notice URLs

- https://www.gov.uk/government/organisations/defence-equipment-and-support
- https://www.legislation.gov.uk/ukpga/2023/54/contents

## Provenance

This Markdown file is an alternate public rendering of the D3 Tenders contract record. The canonical page is https://d3tenders.com/contract/?ocid=ocds-h6vhtk-054840. The underlying structured data is available as OCDS JSON at https://d3tenders.com/contract/ocds-h6vhtk-054840.json.