Audit trail · what the agent proposed vs. what the engineer signed
NC-TOUR-001
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D2 — Problem description
Edited
Agent proposed
Type II sulfuric anodic coating on lot LOT-AN-42 (PN-AL-3382) measured 0.4 mil, below the SPEC-AN-7 §4.2 floor of 0.7 mil (required 0.7–1.2 mil) — ~43% under the minimum.
Engineer's final · signed H. Garza (Quality Eng.)
Type II sulfuric anodic coating on lot LOT-AN-42 (PN-AL-3382) measured 0.4 mil, below the SPEC-AN-7 §4.2 floor of 0.7 mil (required 0.7–1.2 mil) — ~43% under the minimum. Engineer note: confirmed against the calibrated reference standard; 3 of 5 points below floor.
D3 — Interim containment
As drafted
Agent proposed
Quarantine lot LOT-AN-42 and 100% eddy-current inspect at five points per SPEC-AN-7 §4.2; hold downstream lots on the same rectifier pending the voltage finding.
Engineer's final · signed H. Garza (Quality Eng.)
Quarantine lot LOT-AN-42 and 100% eddy-current inspect at five points per SPEC-AN-7 §4.2; hold downstream lots on the same rectifier pending the voltage finding.
D4 — Root cause
As drafted
Agent proposed
Bath voltage sagged from the ~15 V setpoint to ~11 V mid-run (PD-AN-42-03/04), dropping current density to 7.9 asf (PD-AN-42-07). Coating growth is charge-driven, so the sustained low current density is mechanistically consistent with the 0.4 mil result, and mirrors recurrence NC-PRIOR-101. Underlying reason for the sag is not yet established.
Engineer's final · signed H. Garza (Quality Eng.)
Bath voltage sagged from the ~15 V setpoint to ~11 V mid-run (PD-AN-42-03/04), dropping current density to 7.9 asf (PD-AN-42-07). Coating growth is charge-driven, so the sustained low current density is mechanistically consistent with the 0.4 mil result, and mirrors recurrence NC-PRIOR-101. Underlying reason for the sag is not yet established.
D5 — Permanent corrective action
As drafted
Agent proposed
Pending root-cause confirmation: retrieve rectifier output/maintenance logs for the run; if rectifier-confirmed, repair/replace the failing component (as in NC-PRIOR-101) and verify output under load before returning the line to service.
Engineer's final · signed H. Garza (Quality Eng.)
Pending root-cause confirmation: retrieve rectifier output/maintenance logs for the run; if rectifier-confirmed, repair/replace the failing component (as in NC-PRIOR-101) and verify output under load before returning the line to service.
D7 — Prevent recurrence
As drafted
Agent proposed
Add in-run SPC/interlock on bath voltage and current density with auto-alarm; verify per-run rectifier output checks; require recorded five-point thickness per SPEC-AN-7 §4.2.
Engineer's final · signed H. Garza (Quality Eng.)
Add in-run SPC/interlock on bath voltage and current density with auto-alarm; verify per-run rectifier output checks; require recorded five-point thickness per SPEC-AN-7 §4.2.
Event log
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