SFK-standard procedures for professional, defensible, and efficient frozen meat examinations.

Field Survey Guide v.202407.1

Purpose & Scope

This guide equips surveyors with a clear, step-by-step method to examine frozen meat products at production, storage, or shipment. It covers definitions, timing rules, sampling plans, thermometer technique, acceptance criteria, documentation, optional ambient-monitoring pathways, and SFK enhancements that raise consistency and defensibility without altering regulatory acceptance thresholds.

Key Definitions

• Frozen end-point (ready-to-cook): ≤ 0 °F (−17.8 °C) internal.
• Frozen end-point (ready-to-eat): ≤ 10 °F (−12.2 °C) internal.
• Time reference points: End of production shift marks the start for downstream freezing timelines.
• Lot: A defined, traceable production quantity packaged under essentially the same conditions.
• Sublot: A portion of a lot defined for proportional sampling (e.g., by pallet group or bay).

Freezing Timelines & Eligibility

Use the purchaser’s specification to determine the correct option below. When in doubt, confirm in writing.

• Placed in freezer within 4 hours: Clock starts at end of production shift.
• Frozen within 24 hours: Time begins 4 hours after end of shift.
• Frozen within 72 hours: Time begins 4 hours after end of shift.
• Storage eligibility (shipment): Maintain product at ≤ 0 °F until tender/ship; evidence of thaw/refreeze is not acceptable.

Tip: Build a simple time-window worksheet (shift end → +4 h → 24/72 h endpoints) for each lot.

Establishment Freezing Capability & Verification History

Initial Verification (Full Sampling)

• Goal: Demonstrate the freezer can meet end-points within the required timeframe across consecutive lots.
• Action: Verify every lot initially (full sampling; see “Sampling & Sample Size” below).

Reduced Verification (History Achieved)

• Trigger: After a satisfactory run of consecutive lots, you may reduce frequency and sample size while maintaining proportional coverage across sublots.
• Rule of thumb: Check at least 1 of every 10 lots under the same conditions, with each reduced check still representative (≥ one-third of the standard count).
• Reversion: Any failure returns the site to full sampling unless a clearly non-recurring event is documented and approved (e.g., one-off power outage).

SFK enhancement: Warm-risk mapping: maintain a lot-to-location matrix (door adjacency, airflow shadows, high stacks) and preferentially sample from those areas.

Sampling & Sample Size

• Lot coverage: Distribute samples proportionally across sublots; never sample only from a single “easy” location.
• Consolidated shipments: When multiple lots are combined for shipment, scale sampling proportionally; one non-compliant sample rejects the entire combined lot for that shipment.
• Borderline expansion (SFK): If any measurement is within 2 °F of the limit, add two extra samples from warm-risk locations in the same lot.

Thermometers, Calibration & Probing

Instruments

• Primary thermometer: Calibrated probe thermometer suitable for frozen product.
• Secondary redundancy (SFK): Carry a backup instrument (or IR + probe pair) to resolve disputes on the spot.

Daily Calibration & Records

• Calibration method: Ice-point and/or boiling-point check; record serial numbers, date/time, method, and results.
• Stabilization: Allow readings to settle before recording; note stabilization time for the first sample.

Probing Technique

• Expose product: Open or cut film to expose product (avoid reading through packaging).
• Drill guide: Pre-drill a hole slightly larger than the probe to prevent friction heating; sanitize the bit before each use.
• Depth & placement: Center-mass where practical; for irregular items, choose the likely warmest region.
• Tolerance: Apply ± 2 °F around the acceptance threshold to account for instrument and method variability.
• Acceptance rule: Any one sample out of specification → the lot fails (see “Disposition & Corrective Actions”).

SFK enhancement: Photograph probe placement and the instrument display at the stable reading to strengthen evidentiary value.

Optional Ambient-Monitoring Pathway (Advanced)

For sites with mature controls, continuous freezer ambient monitoring (≤ 0 °F) may support shipment without repeated product probing, provided documented proof shows the freezer consistently protects product:

• Ambient recorders/loggers: Maintain continuous traces and daily sign-offs.
• Defrost management: Define permissible defrost peaks/durations via validation; exceeding the envelope triggers product checks for all lots stored in the affected freezer.
• Excursions > 0 °F: Verify product temperatures on impacted lots before shipment.
• SFK oversight: Keep a one-page validation summary (peak/time limits + initial verification data) with each monitored freezer.

Acceptance Criteria (At Time Target or Shipment)

• Ready-to-cook meat: ≤ 0 °F internal on all required samples.
• Ready-to-eat meat: ≤ 10 °F internal on all required samples.
• Evidence of thaw/refreeze: Not acceptable (e.g., crystal slump, purge inconsistent with deep-frozen state).
• Documentation completeness: Temperature worksheets + calibration logs + sample maps must be complete.

Binary rule: One non-compliant sample → the lot fails. Apply hold procedures immediately.

Disposition & Corrective Actions

• Accept: All samples in spec within the required timeframe; file complete evidence pack.
• Hold/Reject: Any out-of-spec sample or unverified timelines; segregate the lot, label, and notify QA.
• Re-freeze/re-check (if permitted by spec): Document the corrective pathway, re-start timing as applicable, and re-verify per standard sampling rules.
• Reversion of history: Any failure under a reduced-verification program returns the site to full sampling until a new satisfactory history is established.

Documentation: SFK Evidence Pack (Strongly Recommended)

• Temperature readings: Lot/sublot, item ID, exact location, time, instrument ID, stabilized value.
• Calibration: Daily checks recorded (serials + method + results).
• Photos/video: Probe site, instrument display at stable reading, carton/lot labels, location context (pallet/bay map).
• Ambient pathway (if used): Logger charts/data with daily sign-off, plus the defrost validation summary.
• Dispositions: Accept/Hold/Reject with justification, corrective actions, and approvals.

Conduct at Freezer & Dock (Cold-Chain Discipline)

Pre-exam

• Route plan: Confirm lot locations, freezer IDs, and time windows.
• Pre-cool staging: Minimize door-open time; coordinate with warehouse staff.

During checks

• Handling: Keep cartons closed except where exposure is necessary; reseal promptly.
• Door discipline: Close between moves; avoid prolonged open times during probing.

Loading/Shipment (if observed)

• Trailer readiness: Pre-cool, clean, odor-free, tight-sealing.
• Setpoint & logging: Set/verify reefer; activate continuous recording.
• Seals & paperwork: Record seal numbers and any seal change (who/when/why).

Transport & Receipt (If You Receive the Load)

• Arrival temperature: Verify representative case-level temps ≤ 0 °F (ready-to-cook) or ≤ 10 °F (ready-to-eat).
• Condition checks: No wet/damaged cartons, no thaw/refreeze indicators, no foreign odors/residues.
• Records: Collect temp logs, seal logs, BOL/waybills, and sanitation evidence if applicable.
• Disposition: Accept / Hold / Reject with clear notes and supporting evidence.

Surveyor Safety & Professionalism

• PPE: Cold-room gloves, eye protection, nonslip footwear, hearing protection if required.
• Tool safety: Secure corded tools, use low-profile drills, sanitize bits; store sharp implements safely.
• Site rules: Follow all facility SOPs (escort rules, forklift lanes, lock-out/tag-out zones).
• Respect operations: Coordinate to limit disruptions; schedule during low-traffic windows where possible.

Immersive Visual Documentation (Optional, SFK Program)

When offered as a courtesy enhancement:

• Capture approach: Stabilized 4K walkthrough using a compact 3-axis gimbal with wide-angle lens (e.g., “DJI Osmo Pocket”-class), holding 3–5 s on labels/instruments.
• Stills from video: Extract frames for labels, probe readouts, seals, and setpoints.
• Secure storage: Upload to SFK restricted workspace; mirror to private Drive.
• Indexing: Keyframes every 1–2 s, OCR/barcodes, object tags (pallets, cartons, seals, thermometers), timestamp index.
• Use: Supports the written report by speeding retrieval of specific evidence; does not replace professional judgment or specifications.

Quick Checklists

Pre-Exam

• Specs confirmed: Freezing option & time window aligned to shift end.
• Instruments: Calibrated, serials recorded; spare batteries/media.
• Lot map: Locations & warm-risk areas identified.

Sampling & Probing

• Coverage: Proportional across sublots; high-risk areas included.
• Technique: Expose product, pre-drill, sanitize, stabilize, record.
• Photos: Probe site, display, label, context.

Acceptance & Records

• Criteria: All samples in spec; any out-of-spec → Hold/Reject.
• Evidence pack: Temps + calibration + photos + maps complete.
• If ambient path used: Logger trace (≤ 0 °F) + defrost validation in range.

Records Retention (Minimum)

• Temperature worksheets: All readings with context.
• Calibration logs: Daily results tied to thermometer serials.
• Photo/video set: Probe placements, displays, labels, context.
• Ambient/defrost (if used): Charts/data + validation summary.
• Dispositions/CAPA: Accept/Hold/Reject decisions with root cause and corrective actions.

SFK Quality Notes

• Consistency: Standardized technique (exposure, drilling, stabilization) reduces variability.
• Defensibility: Objective evidence (photos/video + logs) supports findings.
• Efficiency: Clear time windows and sampling rules reduce rework and disputes.
• Scalability: Reduced verification for proven freezers minimizes disruption while maintaining assurance.

Appendix: Practical Temperature Targets (Reference)

• Ready-to-cook meat: ≤ 0 °F internal at verification point.
• Ready-to-eat meat: ≤ 10 °F internal at verification point.
• Shipment/storage: Maintain ≤ 0 °F for deep-frozen product; no thaw/refreeze evidence.