What is line clearance, and what do GMP regulations require for it?

1What line clearance is.

Line clearance is the check, made before an operation starts, that the work area, line and equipment are clean and hold nothing from the previous operation that the next one doesn’t need. EU GMP defines it in Chapter 4: packaging instructions should include “checks that the equipment and work station are clear of previous products, documents or materials not required for the planned packaging operations (line clearance), and that equipment is clean and suitable for use.”¹ Chapter 5 adds that the line clearance “should be performed according to an appropriate check-list.”²

The controls it belongs to are aimed at mix-ups and cross-contamination. EU GMP asks packaging programmes to give particular attention to “minimising the risk of cross-contamination, mix-ups or substitutions” (5.49).² 21 CFR 211.130 requires written procedures “designed to assure that correct labels, labeling, and packaging materials are used for drug products”.³

21 CFR Part 211 doesn’t use the words “line clearance”. It asks for the same check in its own terms: an inspection of the packaging and labelling facilities “immediately before use”, recorded in the batch record.³ FDA’s 2004 aseptic processing guidance does use the term, for example where it says a media fill’s ability to detect contamination “should not be compromised by a large-scale line clearance”.⁴

2What 21 CFR Part 211 requires.

These are the sections of 21 CFR Part 211 a line clearance procedure answers to.³⁵⁶⁷

The end of one run and the start of the next meet here. Section 211.188(b)(6) asks for the area inspection after use as well as before, and the labelling reconciliation accounts for what was issued, used and returned.⁵⁷ Any unexplained discrepancy found in review “shall be thoroughly investigated”, and the investigation extends to other batches that may be associated with it.⁸

3What EU GMP requires.

EU GMP sets the check for processing as well as for packaging. Chapter 5, in operation since 1 March 2015, says this:²

• Before any processing operation starts, the work area and equipment should be “clean and free from any starting materials, products, product residues or documents not required for the current operation” (5.40).
• Before packaging starts, the work area, packaging lines, printing machines and other equipment should be clean and free from any products, materials or documents previously used, if they aren’t required for the current operation, and the line clearance follows a check-list (5.50).
• The name and batch number of the product should be displayed at each packaging station or line (5.51).
• Operations on different products should not run simultaneously or consecutively in the same room unless there is no risk of mix-up or cross-contamination (5.9).
• When packaging is complete, unused batch-coded packaging materials should be destroyed and the destruction recorded (5.62).

Chapter 4, in operation since 30 June 2011, puts the check into the instructions. Processing instructions include checks that the equipment and work station are clear of previous products, documents or materials and that equipment is clean (4.18(c)). Packaging instructions include the line clearance checks and “a careful examination of the area and equipment in order to ascertain the line clearance before operations begin” (4.19(f) and (g)).¹

4Active substances, ATMPs and sterile rooms.

ICH Q7, the GMP guide for active pharmaceutical ingredients, says packaging and labelling facilities “should be inspected immediately before use to ensure that all materials not needed for the next packaging operation have been removed.” The examination is documented “in the batch production records, the facility log, or other documentation system” (9.44). Its cleaning procedures include inspection of equipment for cleanliness immediately before use, “if practical” (5.21).⁹

The European Commission’s GMP guidelines for advanced therapy medicinal products, which ATMP manufacturers were to comply with by 22 May 2018, list “confirmation that line-clearance has been performed prior to starting manufacturing operations” among the contents of the batch processing record (6.26).¹⁰

In sterile manufacturing, Annex 1 ties line clearance to room classification. The “at rest” particle limits should be reached after a “clean up” period on completion of operations and line clearance or cleaning, with a guidance value of less than 20 minutes, set during room qualification and written into procedures (4.29).¹¹

5What a line clearance record shows.

Taken together, the rules ask a clearance record to show:

• which area, line, equipment and printing devices were checked, against which product and batch is about to start;
• that previous products, materials, labels and documents were removed and that equipment is clean;
• that the materials issued for the new batch were examined for identity and correctness;
• the result, who performed the check and who verified it where the procedure requires it;
• where it is recorded: the batch production record in the US, or for APIs the batch record, facility log or another documentation system.³⁵¹⁹

The quality unit reviews these records, packaging and labelling included, before the batch is released.⁸

6How it runs in Seal.

In Seal, a packaging line clearance defines the zones, equipment, conveyors, printers, vision systems, bins, documents, materials and electronic print queues that must be free of the previous order or set up for this one. Each observation records the location, expected state, person, time, evidence, exceptions and independent verification where it is required, and clearing a bench while the previous market’s print file is still queued is not a complete clearance. The clearance, components, label events and reconciliation are recorded against the packaging order, so the quality unit reviews them together before release.

Neil can draft a line-clearance workflow from your SOP: proposed capture fields, an independent second-person check and the cases that should fail, such as the same person in both roles. Your process and quality owners verify the configuration and release it under change control.