--- title: "Part-145 Parts Storage, Shelf Life and ESD · Avioverse" description: "Inspect aircraft stores for access, segregation, shelf life, environmental conditions and electrostatic protection, with a form and recorded follow-up." url: "https://avioverse.aero/guides/part-145-parts-storage-shelf-life-esd" --- # Part-145 Parts Storage: Conditions, Shelf Life and ESD Inspect aircraft stores for access, segregation, shelf life, environmental conditions and electrostatic protection, with a form and recorded follow-up. [Dionysis Kefalas](https://avioverse.aero/articles/author/dennis-kefalas) 21 Oct 2026 6 min read For Part-145, CAMO and Air Ops staff Part 9 of 9 in EASA Part-145 Maintenance Organisation Show parts Hide parts 1. 1 [Part-145: The Approved Maintenance Organisation](https://avioverse.aero/guides/easa-part-145-approved-maintenance-organisation) 2. 2 [Part-145 Certifying and Support Staff](https://avioverse.aero/guides/easa-part-145-certifying-staff-personnel) 3. 3 [Part-145 Maintenance Data and Performance](https://avioverse.aero/guides/easa-part-145-maintenance-data-performance) 4. 4 [Part-145 Maintenance Certification and Records](https://avioverse.aero/guides/easa-part-145-certification-of-maintenance-records) 5. 5 [The Maintenance Organisation Exposition (MOE)](https://avioverse.aero/guides/easa-part-145-maintenance-organisation-exposition) 6. 6 [Part-145 Tool Control and Calibration (145.A.40)](https://avioverse.aero/guides/part-145-tool-control-calibration-145-a-40) 7. 7 [Receiving Inspection of Aircraft Parts: 145.A.42](https://avioverse.aero/guides/receiving-inspection-aircraft-parts-145-a-42) 8. 8 [Part-145 Approved Supplier List and Evaluation](https://avioverse.aero/guides/part-145-supplier-evaluation-approved-supplier-list) 9. 9 Part-145 Parts Storage, Shelf Life and ESD Quotes checked on 21 Oct 2026 against EASA Easy Access Rules for Continuing Airworthiness (Regulation (EU) No 1321/2014) — 2 Sep 2025 revision. On this page ## Preserve the condition accepted at receipt A receiving inspection records the condition of an item when it arrives. Storage can change it: packaging opens, an expiry date passes or environmental conditions move outside the item's limits. Use the Avioverse Monthly stores inspection form to examine the store and record discrepancies needing action. The monthly frequency in its title is a proposed scheduling choice; set the actual frequency through the applicable instructions and your procedure. Arrival checks belong in the [receiving inspection guide](https://avioverse.aero/guides/receiving-inspection-aircraft-parts-145-a-42). This guide covers the period between receipt and issue. ## Secure storage and the applicable instructions [145.A.25(d) (full rule text)](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-145/section-a-technical-and-organisation-requirements/145-a-25) Storage facilities > (d) Secure storage facilities are provided for components, equipment, tools and material. Storage conditions ensure segregation of serviceable components and material from unserviceable aircraft components, material, equipment and tools. The conditions of storage are in accordance with the manufacturer's instructions to prevent deterioration and damage of stored items. Access to storage facilities is restricted to authorised personnel. Quoted word for word from Regulation (EU) No 1321/2014, Easy Access Rules for Continuing Airworthiness, 2 Sep 2025 revision. The rule joins access, segregation and preservation of condition. A locked room can still hold an expired item in usable stock. A tidy shelf can still mix an uncertain receipt with items available for issue. Check the controls together. | Control | What the inspection establishes | Basis | | ----------------------------------- | ---------------------------------------------------------------------------------------- | ----------------------------------------------------------------------- | | Access and security | Who can enter and how access is restricted | 145.A.25(d) | | Segregation | Whether serviceable stock remains separate from unserviceable and unsalvageable items | 145.A.25(d) and 145.A.42(c)(i) | | Storage conditions | Whether the actual conditions follow the applicable manufacturer's instructions | 145.A.25(d) | | Shelf life and protective packaging | Whether protection remains effective and items approaching or past expiry are controlled | Practical monitoring building on GM1 145.A.42(b)(i)(c)'s receipt checks | | Controlled tools | Whether relevant tools remain within their calibration control | 145.A.40(b); see the tool-control guide | Quarantine is a practical means of keeping uncertain items identifiable and unavailable for unintended issue. It needs a recorded reason and a route to a decision. 145.A.42(c)(i) requires unserviceable and unsalvageable components to be segregated from serviceable components, standard parts and materials. Point (c)(ii) restricts unsalvageable components returning to the supply system, subject to its stated life-extension or repair exceptions. ## Record environmental conditions and investigate excursions Identify the storage instructions for the stock held, including any specified temperature, humidity or other environmental conditions. 145.A.25(d) requires conditions following the manufacturer's instructions; it does not supply one temperature or humidity range for every item. A practical readings register can record location, date and time, reading and unit, the applicable limit and instruction reference, and any action taken. Use the recording frequency needed by those instructions and the local procedure. Daily readings may suit a particular arrangement, but a daily entry alone does not demonstrate that conditions stayed within limits between entries. For example, ExampleMRO finds evidence of a humidity excursion in one storage area. The storekeeper identifies the potentially affected stock and records containment. The responsible technical person assesses the evidence against the applicable storage instructions before deciding its disposition. ExampleAir's CAMO can obtain the resulting stock decision for a planned maintenance input, while the operations team receives an availability update. A return to normal readings is useful evidence, but it does not by itself settle the condition of previously exposed stock. ## Protect shelf life, packaging and sensitive items GM1 145.A.42(b)(i)(c)(2)–(3) describes checks for unexpired shelf life and appropriate packaging at receipt, including electrostatic sensitive devices where necessary. Ongoing review of expiry dates and packaging is a practical way to preserve those controls in stores. Make approaching expiry visible and keep expired items out of usable stock pending a supported disposition. Do not automatically equate shelf-life expiry with the unsalvageable classification in 145.A.42(a)(iii), which concerns mandatory life limitations or non-repairable defects. Any proposed restoration or extension needs its own applicable basis before the item returns to use. Electrostatic discharge (ESD) protection is relevant where the stored items and their handling instructions call for it. Examine protective packaging and, where used, the serviceability and test evidence for wrist straps, mats and other protection equipment. Follow the applicable instructions and local procedure for the method and frequency; the quoted storage rule does not establish a universal wrist-strap test interval. The form also prompts a check of gas-cylinder security, identification and test dates. Treat this as a practical store check against the cylinder instructions and local procedure. This guide does not set cylinder test intervals or specialised technical limits. ## Why the form asks what it asks **Location and date** make the inspection traceable to a particular store and visit. They let a reviewer distinguish a check at the main store from one at a line station, and locate the relevant readings and stock records. **Access, segregation and quarantine** test whether the controls in 145.A.25(d) and 145.A.42(c) work at the shelf. Identification and restricted access help prevent an uncertain or unserviceable item being mistaken for available stock. A quarantine label needs to remain connected to the reason for the hold and the person handling it. **Housekeeping, item condition and protection** look for evidence of damage or deterioration that a stock list cannot show. Packaging, ESD protection, cylinder checks and shelf-life control are practical ways to examine the storage conditions relevant to the items held. Their detailed criteria come from the applicable instructions; the wider storage duty is 145.A.25(d). **Environmental records** allow the inspector to review conditions over the period, including excursions and the response, rather than relying only on the reading taken during the visit. Reference the underlying log and instruction limits in the inspection evidence. **Calibration currency** connects tools held in stores to 145.A.40(b)'s control, calibration and record duties. It helps identify a tool that has remained on the shelf past its permitted interval. Use the [tool-control and calibration guide](https://avioverse.aero/guides/part-145-tool-control-calibration-145-a-40) for interval decisions and the tool register. **The overall result and discrepancies** tell the maintenance manager what needs attention. Record what was found, the affected location or stock, immediate containment and supporting evidence. Explain Not applicable answers so the next reader can distinguish a genuine scope exclusion from a missed check. ## Turn the inspection into completed action The storekeeper or station engineer who is a workspace member records the inspection. Assign the written corrective and preventive action follow-up to a maintenance manager in the workspace. Record the action, responsibility and completion evidence, distinguishing a proposed action from work that has actually been completed. In Avioverse, that assignee records Approve or Request changes with a comment, or Not required with a reason when no further action is needed. People outside the workspace do not fill in the form or its assigned section. The [root-cause and corrective-action guide](https://avioverse.aero/guides/root-cause-corrective-action-easa-findings) explains how to investigate a recurring problem. Keep repeated readings in a register and use the form for the inspection and follow-up. Registers retain row history, file attachments and reminders before a due date. A monthly inspection and a daily readings log are possible local arrangements; the source text does not impose either frequency on every store. ## Where to read it yourself Read 145.A.25(d), 145.A.42(a)(iii) and (c), GM1 145.A.42(b)(i)(c), and 145.A.40(b) in the EASA **Easy Access Rules for Continuing Airworthiness**, **2025-09-02 revision**. The [supplier evaluation guide](https://avioverse.aero/guides/part-145-supplier-evaluation-approved-supplier-list) follows these preservation questions back through the supply chain. ## Forms in this guide ### Maintenance - Monthly stores inspection Monthly check of a store: ESD protection, gas cylinders, cleanliness, condition of stored items, shelf life and the environmental log. | Question | Answer type | Required | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------- | -------- | | Store location | Short answer | Yes | | Inspection date | Date | Yes | | Access restricted to authorised people | Choice: Yes, No, N/A | Yes | | Segregation of serviceable and unserviceable items | Choice: Yes, No, N/A | Yes | | Quarantine identification and segregation | Choice: Yes, No, N/A | Yes | | Serviceability of electrostatic protection equipment Check the protection and test evidence required by the applicable handling instructions and local procedure. | Choice: Yes, No, N/A | Yes | | Security, identification and test dates of gas cylinders Check the applicable cylinder instructions and local procedure; record any expiry or condition concern. | Choice: Yes, No, N/A | Yes | | Store cleanliness and housekeeping | Choice: Yes, No, N/A | Yes | | Condition of stored parts, tools and equipment | Choice: Yes, No, N/A | Yes | | Shelf-life control and removal of expired items from usable stock | Choice: Yes, No, N/A | Yes | | Calibration currency of controlled tools | Choice: Yes, No, N/A | Yes | | Environmental records and compliance with storage limits Use the limits and recording frequency set by applicable storage instructions and the organisation's procedure. | Choice: Yes, No, N/A | Yes | | Result | Choice: Satisfactory, Discrepancies found | Yes | | Discrepancies and immediate action Record discrepancies, immediate containment and evidence references. Explain any N/A answer; the follow-up step records further action or why it is not required. | Long answer | No | Once a response is submitted, the form opens these follow-up steps: - Corrective/preventive actions Educational content, not regulatory compliance advice. Verify against the current regulation text before relying on it. ## In this series ## Frequently asked questions ### What does Part-145 require for parts storage? 145.A.25(d) requires secure storage, segregation of serviceable stock from unserviceable items, storage conditions following the manufacturer's instructions to prevent deterioration and damage, and access restricted to authorised personnel. ### What temperature and humidity limits should an aircraft store use? Use the applicable storage instructions for the items held. 145.A.25(d) does not give a single temperature or humidity limit for every store. Record the limits, evidence of conditions and action on any excursion under the organisation's procedure. ### Is a monthly stores inspection a fixed Part-145 requirement? Monthly is the scheduling choice reflected in the Avioverse form's title. The cited storage rules do not prescribe that frequency. Set inspection and monitoring frequencies using the applicable instructions and the organisation's procedure. ### Does an expired shelf life automatically make a part unsalvageable? No. Keep the item out of usable stock pending a supported disposition. 145.A.42(a)(iii) identifies unsalvageable components by mandatory life limitation or a non-repairable defect; a shelf-life date alone does not establish that classification. ### Can the inspection form replace an environmental readings log? Use the form to record the inspection and its discrepancies, and a separate register for repeated readings. Daily readings and monthly inspections are possible local arrangements, not universal frequencies set by the cited rules. ## Related - [Receiving inspection of aircraft parts: 145.A.42 Guide · 7 min](https://avioverse.aero/guides/receiving-inspection-aircraft-parts-145-a-42) - [Part-145 supplier evaluation and the approved supplier list Guide · 8 min](https://avioverse.aero/guides/part-145-supplier-evaluation-approved-supplier-list) - [Tool control and calibration under Part-145 Guide · 17 min](https://avioverse.aero/guides/part-145-tool-control-calibration-145-a-40) - [Maintenance data, components and performing the work Guide · 8 min](https://avioverse.aero/guides/easa-part-145-maintenance-data-performance) - [Root cause and corrective action for EASA findings Guide · 16 min](https://avioverse.aero/guides/root-cause-corrective-action-easa-findings) Written by Dionysis Kefalas. Retired Hellenic Air Force Captain and founder of Avioverse. [About the author](https://avioverse.aero/articles/author/dennis-kefalas) [Or request early access →](https://avioverse.aero/register?redirect=https%3A%2F%2Fapp.avioverse.aero%2Fforms) Share [LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Favioverse.aero%2Fguides%2Fpart-145-parts-storage-shelf-life-esd)[X](https://twitter.com/intent/tweet?url=https%3A%2F%2Favioverse.aero%2Fguides%2Fpart-145-parts-storage-shelf-life-esd\&text=Part-145%20Parts%20Storage%2C%20Shelf%20Life%20and%20ESD)