In a risk-based inspection (RBI), Schedule M (Oral Solid Dosage Forms) – Point 1.6 is assessed as a cross-contamination and foreign-matter prevention control. The requirement is clear: the manufacturer must guard against any material lodging and remaining undetected in processing or packaging equipment, ensure vacuum/compressed air/air-extraction nozzles are kept clean, and ensure there is no evidence of lubricants leaking into the product.
How inspectors evaluate Point 1.6 (risk-based depth)
1) “Hidden residue” risk (material lodging):
Inspectors target equipment with product traps—transfer chutes, hopper corners, vacuum lines, dedusters, sifter spouts, tablet press feed frames, capsule-filler dosing parts, metal detector rejects, and packaging dust extraction points. They verify design (drainability/cleanability), cleaning SOP coverage, and whether operators can reliably detect residues during changeover.
2) Vacuum / compressed air nozzle control:
Because these nozzles can blow back dust, spread contaminants, or carry residues, RBI checks include: defined cleaning frequency, dismantling/brush-through where needed, pre-use inspection, and records showing the nozzle set used is “clean/ready.”
3) Lubricant contamination prevention:
Inspectors review the lubrication program (approved lubricants, quantities, application points), maintenance records, and evidence of leak checks. Any oil mist, grease stains, or recurring black spots in product/contact areas is treated as high risk.
4) Line clearance and documented checks:
RBI expects proof that before processing or packaging starts, the line is clear of previous product/materials and equipment is clean and suitable, and that this is recorded (often linked to batch records and QA review).
Common RBI red flags
Powder found inside vacuum hoses, “quick change” nozzles without cleaning records, oil leakage near product zones, and repeated deviations/complaints suggesting residues are not being reliably detected or removed.