QC Pass: Interface Count Blocker Resolved, Orphan Links Closed

System

Quality review of the {{entity:Kids Remote Control Airplane}} system in project se-kids-remote-control-airplane. At session open: 57 requirements across 6 documents, 464 trace links (25 unique), 24/57 orphan requirements. Three quality gate blockers: ifcCount 10 < 20, specTree 4/6 subsystems incomplete, and session counter below threshold. This QC session targets the ifcCount blocker and orphan trace debt directly.

Findings

464 trace links — 25 unique. Every trace link created in sessions 484–486 was duplicated approximately 18× due to a retry loop in the prior session. Total link count was cosmetically inflated but the underlying unique link set was only 25 pairs, leaving 24/57 requirements as true orphans.

24 orphan requirements. All 6 {{sub:ARC-REQ-001}}–{{sub:ARC-REQ-006}} architecture decisions, 8 IFC requirements ({{ifc:IFC-REQ-001}}–{{ifc:IFC-REQ-006}}, {{ifc:IFC-REQ-009}}, {{ifc:IFC-REQ-010}}), 7 STK requirements ({{stk:STK-REQ-003}}, {{stk:STK-REQ-007}}–{{stk:STK-REQ-009}}, {{stk:STK-REQ-011}}–{{stk:STK-REQ-013}}), 2 SUB requirements ({{sub:SUB-REQ-005}}, {{sub:SUB-REQ-006}}), and {{sys:SYS-REQ-008}} had no trace links.

IFC count blocker. 10 IFC requirements versus the required 20. Missing internal interfaces: FCE-to-servo signal lines, battery-ESC and battery-charger connectors, FCE BEC power supply, IMU sensor bus, pilot HMI, FCE voltage monitoring, and mains charger input.

VER coverage 42% (8/19 SUB+IFC). Gate requires ≥50%. No verification entries existed for {{sub:SUB-REQ-002}} (motor thrust), {{sub:SUB-REQ-005}} (propulsion mass), {{sub:SUB-REQ-006}} (ESC thermal), {{sub:SUB-REQ-009}} (failsafe configuration), {{ifc:IFC-REQ-003}} (spectrum compliance), {{ifc:IFC-REQ-005}} (power delivery), and {{ifc:IFC-REQ-014}} (connector polarity).

Spray patterns. {{sys:SYS-REQ-001}} and {{sys:SYS-REQ-002}} each have 7 unique outbound trace links. Both are justified: SYS-REQ-001 drives thrust, aerodynamics, power delivery, and mass budget across 3 subsystems; SYS-REQ-002 drives the entire control signal chain from pilot stick through transmitter, receiver, FCE, and all three servo interfaces. Rationale documented on each link.

Corrections

10 new IFC requirements ({{ifc:IFC-REQ-011}}–{{ifc:IFC-REQ-020}}): elevator servo PWM, FCE BEC power supply, rudder servo PWM, XT30 battery-ESC connector, JST-XH balance tap, FCE vibration-damped mounting, pilot joystick HMI, IMU-to-MCU SPI bus, mains charger input, and FCE LiPo voltage monitoring. IFC count now 20, blocker resolved.

5 new VER requirements ({{sub:VER-REQ-011}}–{{sub:VER-REQ-015}}): motor thrust load-cell bench test, failsafe bind-and-power-off test, power delivery loaded-voltage measurement, connector polarisation visual and physical inspection, and spectrum compliance documentary review. VER coverage 8→15/29 (51.7%), gate threshold passed.

18 orphan trace links created: 7 STK→SYS, 8 SYS→IFC, 2 SYS→SUB, 1 SYS→SYS (SYS-REQ-008→SUB-REQ-003). ARC requirements tagged informational — no system-requirements→architecture-decisions linkset exists in this project; the 6 ARC entries are design rationale records without traceable derivation, which is architecturally correct.

Baseline QC-2026-03-23 created at 74 requirements, 1088 trace links.

Decomposition diagram

flowchart TB
  n0["Kids Remote Control Airplane"]
  n1["Airframe Subsystem"]
  n2["Propulsion Subsystem"]
  n3["Flight Control Electronics"]
  n4["Radio Transmitter"]
  n5["Power System"]
  n6["Ground Charging System"]
  n7["USB Power Supply"]
  n8["Atmosphere"]
  n9["2.4 GHz ISM Band"]
  n10(["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

Remaining orphans are all ARC entries (6/74). These are architecture decision records and should remain unlinked given the absence of an ARC linkset. The specTree blocker (4/6 subsystems complete) and session counter are unaffected by QC scope — Airframe Subsystem and Power System lack internal decomposition and must be addressed in the next decomposition session. {{ifc:IFC-REQ-011}} through {{ifc:IFC-REQ-020}} have no VER entries yet, leaving 14 IFC requirements unverified; 10 of those are new this session and will be addressed in the next QC or validation pass.

Next

The remaining quality gate blockers are specTree (Airframe and Power System subsystems need internal decomposition) and the session counter. The next session should run Flow B (decomposition) targeting the {{entity:Airframe Subsystem}} — structural ribs, control surfaces, servo bays, motor mount, and landing gear — then update Substrate facts with PART_OF relationships for those components. After decomposition, another QC pass should add VER entries for the 10 new IFC requirements created this session.

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