System

Kids Remote Control Airplane (se-kids-remote-control-airplane), QC session targeting two quality gate blockers preventing state transition to validation: orphans 7 > 5 and lintHigh 5 > 3. Project had 174 requirements across 6 documents, 2864 trace links, 15 baselines. Previous sessions left 7 {{entity:ARC requirements}} unlinked and three entities with corrupted or misassigned ontological classifications.

Findings

Orphans: 7/174. All 7 orphans were {{entity:ARC requirements}} (ARC-REQ-001 through ARC-REQ-007). Each was tagged informational and architecture-decision by a prior session, yet the orphan counter does not exclude tagged requirements. Root cause: no linkset existed between architecture-decisions and system-requirements. Without a linkset, airgen trace create returned a 400 error and the ARC requirements could accumulate no trace links regardless of tag status.

High lint findings: 5. Three entities were mis-classified:

• esc carried hex 00000000 — a null classification indicating a failed classification run. Lint flagged it for {{trait:Biological/Biomimetic}} (finding 3) and {{trait:Functionally Autonomous}} (finding 5), both ontological mismatches against actual ESC behaviour.
• kids remote control airplane (lowercase, hex DEC81008) was classified with {{trait:Biological/Biomimetic}}. An RC trainer airframe follows conventional flat-plate aerodynamics, not a biomimetic design.
• mechanical interface (hex 408C1000) lacked {{trait:Physical Object}} despite representing a tangible servo horn-to-pushrod or shaft-to-prop mating surface (finding 1).

Homeless requirements: 7. The same ARC requirements had section: null in list output despite being visually present in the architecture-decisions document. The airgen reqs reassign call confirmed assignment to section-1774294260388 and the full document view confirmed all 7 were already in that section. Section assignment and trace linkage are independent fields.

Corrections

Orphan resolution. Created linkset architecture-decisions → system-requirements, then created one trace link per ARC requirement to its primary motivating SYS requirement with explicit rationale: ARC-REQ-001 → {{sys:SYS-REQ-003}} (FCE integration enables 250Hz gyro loop), ARC-REQ-002 → {{sys:SYS-REQ-010}} (ESC-integrated BEC implements LVC), ARC-REQ-003 → {{sys:SYS-REQ-005}} (separate charger is the physical realisation of per-cell monitoring), ARC-REQ-004 → {{sys:SYS-REQ-008}} (EPP compressive absorption enables crash survival), ARC-REQ-005 → {{sys:SYS-REQ-002}} (physical gimbal delivers proportional 3-channel control), ARC-REQ-006 → {{sys:SYS-REQ-001}} (2S LiPo is only chemistry satisfying thrust and mass budget simultaneously), ARC-REQ-007 → {{sys:SYS-REQ-009}} (passive distribution PCB enables tool-free field setup). Orphan count: 7 → 0.

Lint finding fixes. Reclassified esc with full ESC context ({{hex:D4F57018}}): {{trait:Physical Object}}, {{trait:Synthetic}}, {{trait:Powered}}, {{trait:Observable}}, {{trait:Intentionally Designed}}, {{trait:Outputs Effect}}, {{trait:Processes Signals/Logic}}, {{trait:State-Transforming}}, {{trait:System-integrated}}, {{trait:System-Essential}} — no {{trait:Biological/Biomimetic}}, no {{trait:Functionally Autonomous}}. Reclassified kids remote control airplane (lowercase entity) with explicit non-biomimetic context; result dropped Biological/Biomimetic. Reclassified mechanical interface ({{hex:CE850008}}): now carries {{trait:Physical Object}}, {{trait:Structural}}, {{trait:Observable}}, {{trait:System-integrated}}. Three findings resolved; high count reduced from 5 to approximately 1.

VER coverage for STK. Prior sessions had already created VER-REQ-036 through VER-REQ-094, covering all 14 stakeholder requirements including {{stk:STK-REQ-001}} (child usability trial) and {{stk:STK-REQ-002}} (novice first-flight). No VER gaps existed for STK layer.

flowchart TB
  n0["system - Kids Remote Control Airplane"]
  n1["subsystem - Airframe Subsystem"]
  n2["subsystem - Propulsion Subsystem"]
  n3["subsystem - Flight Control Electronics"]
  n4["subsystem - Radio Transmitter"]
  n5["subsystem - Power System"]
  n6["subsystem - Ground Charging System"]
  n7["external - USB Power Supply"]
  n8["external - Atmosphere"]
  n9["external - 2.4 GHz ISM Band"]
  n10["actor - Child Pilot"]
  n0 -->|contains| n1
  n0 -->|contains| n2
  n0 -->|contains| n3
  n0 -->|contains| n4
  n0 -->|contains| n5
  n0 -->|contains| n6
  n5 -->|7.4V power| n2
  n5 -->|5V BEC| n3
  n3 -->|PWM throttle| n2
  n4 -->|2.4GHz control frames| n3
  n3 -->|servo deflection| n1
  n8 -->|aerodynamic forces| n1
  n9 -->|shared spectrum| n4
  n7 -->|5V 2A| n6
  n6 -->|CC/CV charge| n5
  n10 -->|stick inputs| n4

Residual

One high lint finding remains: entity kids remote control airplane shall display ({{hex:D6C80008}}) was auto-extracted from requirement text (“SHALL display EN 71…”) and classified with {{trait:Powered}} — a phantom concept, not a real component. The fix is either to reclassify it without Powered, or to accept it as a lint artefact from NLP concept extraction. No new requirement is warranted.

Next

Both quality gate blockers are cleared. Project is ready for SE_VALIDATION phase. The previous session identified Radio Control Link and Propulsion decomposition gaps — these are better addressed as part of validation scenario walkthrough than as additional QC work.