The Missing Record

Demonstration purpose

Show how Delta Arc can reconstruct a safety-critical event from manufacturing work, missing documentation, physical evidence, regulatory response, recommendations, and later oversight decisions without making an airworthiness determination.

Question

How can public evidence be organized into a traceable chain from nonroutine factory work to an in-flight structural failure, regulatory action, systemic findings, and unresolved control questions?

Decision context

A quality, oversight, or executive team could use this structure to determine:

• which controls failed;
• which findings are directly established;
• which corrective actions were ordered or recommended;
• which later regulatory actions occurred;
• which recommendation statuses still require a current check;
• where the public record cannot support a conclusion.

This is informational evidence architecture. It is not an inspection, certification, maintenance, or flight-safety decision.

Entity model

• Aircraft: Boeing 737-9, registration N704AL
• Flight: Alaska Airlines Flight 1282
• Operator: Alaska Airlines
• Manufacturer: Boeing Commercial Airplanes
• Regulator: Federal Aviation Administration
• Investigator: National Transportation Safety Board
• Physical assembly: left mid-exit door plug
• Critical hardware: four vertical-movement securing bolts and related hardware
• Manufacturing work: fuselage rivet rework
• Control record: parts-removal record
• Control system: Boeing Common Manufacturing Execution System
• Assurance activity: quality inspection and final signoff
• Oversight artifacts: audit records, surveillance records, certificate-management plans
• Recommendation set: NTSB A-25-15 through A-25-33

Event chronology

1. September 18, 2023 The left mid-exit door plug was opened during production to permit rivet rework. NTSB found no removal record documenting that the accepted installation had been disturbed. [A1][A2]

1. September 19, 2023 The plug was closed. NTSB found that no permitted door-team personnel were on duty when it was closed and that the missing removal record meant no quality-assurance inspection of the closure occurred. [A2]

1. Before delivery NTSB physical-evidence analysis concluded that the four bolts intended to prevent upward plug movement were missing before delivery. [A1][A2]

1. January 5, 2024 The plug separated while Flight 1282 climbed through approximately 14,830 feet. The aircraft rapidly depressurized, eight people sustained minor injuries, and the crew returned safely to Portland. [A1]

1. January 6, 2024 FAA ordered the temporary grounding of affected Boeing 737-9 aircraft. FAA's record says it grounded 171 Boeing 737-9 MAX aircraft operated by U.S. airlines or in U.S. territory. [A3]

1. January 24, 2024 FAA approved an inspection and maintenance process for grounded aircraft and halted production expansion of the 737 MAX. [A3]

1. March 2024 FAA reported that its production audit identified noncompliance involving manufacturing process control, parts handling and storage, and product control. [A3]

1. May 30, 2024 FAA reviewed Boeing's corrective-action roadmap while continuing increased onsite oversight and production restrictions. [A4]

1. June 24, 2025 NTSB determined that Boeing's inadequate training, guidance, and oversight caused the accident. NTSB identified ineffective FAA oversight as a contributing factor and issued 19 new recommendations. [A1][A2]

1. July 20, 2026 After a staged return beginning in September 2025 and eight months of comparative production-quality data, FAA's decision, announced July 17 and effective July 20, allowed Boeing to resume issuing airworthiness certificates for all 737 MAX and 787 aircraft under continuing FAA oversight. [A5]

Claim register

Observed

AVI-O-001 The aircraft experienced an in-flight separation of its left mid-exit door plug and rapid depressurization on January 5, 2024. Evidence: NTSB investigation record. [A1]

AVI-O-002 NTSB found physical evidence indicating that the four securing bolts were absent before the plug moved off its stop pads. Evidence: NTSB final report. [A2]

AVI-O-003 No required removal record for opening the plug was identified. Evidence: NTSB final report. [A2]

AVI-O-004 The missing removal record meant that no quality-assurance inspection of the plug closure occurred. Evidence: NTSB final report. [A2]

AVI-O-005 FAA grounded affected aircraft, required inspections, increased manufacturing oversight, and halted production expansion. Evidence: FAA chronology and enforcement updates. [A3][A4]

AVI-O-006 NTSB issued 19 new recommendations covering design, manufacturing records, training, regulatory oversight, safety management, oxygen systems, and record retention. Evidence: NTSB investigation and final report. [A1][A2]

AVI-O-007 FAA returned airworthiness-certificate issuance authority to Boeing in July 2026 after a phased process and stated that inspections, audits, and monitoring would continue. Evidence: FAA July 2026 announcement. [A5]

Corroborated

AVI-C-001 The event was not adequately described as a single missing-hardware event. NTSB identified connected failures in documentation, training, process usability, quality assurance, corrective action, and regulatory oversight. Evidence: NTSB findings and FAA audit response. [A2][A3][A4]

AVI-C-002 Both NTSB and FAA records support treating manufacturing-process control and oversight as central parts of the event chronology. Evidence: NTSB probable-cause record and FAA production-oversight actions. [A1][A3]

Derived

AVI-D-001 The control chain can be modeled as:

Accepted installation
→ nonroutine disturbance
→ required removal record
→ required reinstallation steps
→ quality signoff
→ production history
→ regulator surveillance

The public record indicates breaks at the removal-record and quality-inspection points. [A2]

AVI-D-002 Operational return, production oversight, recommendation closure, and systemic remediation occur on different timelines. A chronology that shows only the aircraft's return to service would omit later systemic findings and recommendations.

Inferred

AVI-I-001 A safety-control intelligence system should preserve links among the disturbed component, work authorization, worker qualification, removal record, restoration steps, inspection, recurring nonconformance history, and regulatory response.

This is a Delta Arc systems inference, not an NTSB or FAA instruction.

Contradictions, gaps, and unknowns

• NTSB could not determine who opened the plug, why no removal record was created, or who performed the final closure. [A2]
• Later FAA authorization for Boeing to issue airworthiness certificates does not by itself prove that every NTSB recommendation is closed.
• This page does not state the current status of any A-25 recommendation. Check the NTSB recommendation database for it.
• The public record does not establish the present condition of any individual aircraft.
• The demonstration cannot assign legal liability. NTSB explicitly distinguishes its safety mission from assigning fault or liability. [A2]
• Regulatory statements issued at different dates describe different stages of remediation and should not be flattened into a single status.

Safe Delta Arc outputs

• Source-linked event chronology
• Manufacturing-control relationship graph
• Documentary-gap map
• Recommendation and response tracker
• Evidence-classified executive brief
• Versioned “what changed since the last review” update
• Public-source systems-learning demonstration

Prohibited outputs

• Airworthiness determination
• Maintenance or repair instruction
• Flight-operation recommendation
• Certification decision
• Supplier approval
• Regulatory-compliance conclusion
• Legal-liability allocation
• Claim that an FAA authorization closed every NTSB recommendation
• Claim that the demonstration establishes Delta Arc as an aviation authority

Official source register

[A1] NTSB investigation DCA24MA063, completed investigation page Accessed November 1, 2026 https://www.ntsb.gov/investigations/Pages/DCA24MA063.aspx

[A2] NTSB Aviation Investigation Report AIR-25-04, final report https://www.ntsb.gov/investigations/AccidentReports/Reports/AIR2504.pdf

[A3] FAA updates on Boeing 737-9 MAX aircraft https://www.faa.gov/newsroom/updates-boeing-737-9-max-aircraft

[A4] FAA, “FAA Continues to Hold Boeing Accountable for Implementing Safety and Production Quality Fixes,” May 30, 2024 https://www.faa.gov/newsroom/faa-continues-hold-boeing-accountable-implementing-safety-and-production-quality-fixes

[A5] FAA, “After Months of Safety Review, FAA Allows Boeing to Resume Issuing Certificates for New Airplanes,” July 17, 2026 https://www.faa.gov/newsroom/after-months-safety-review-faa-allows-boeing-resume-issuing-certificates-new-airplanes

Changes made at release

• Corrected the scope of the 171 aircraft to match FAA's record.
• The current recommendation status could not be confirmed at release, so this page makes no claim about it.
• Stated both the announcement date and the effective date.