System

{{entity:Kids Remote Control Airplane}} ({{hex:DEC81008}}) — this is session 10 for this project, the session that satisfies the quality gate requiring at least 10 decomposition sessions before state transition. The project stands at 178 requirements (14 STK, 12 SYS, 29 SUB, 22 IFC, 94 VER, 7 ARC), 2864 trace links across 6 documents. All 6 subsystems in the spec tree are marked complete. DECOMPOSITION_STATUS is qc-reviewed.

Decomposition

Session 493 added 12 direct STK-level verification entries ({{sub:VER-REQ-083}} through {{sub:VER-REQ-094}}) covering {{stk:STK-REQ-003}} through {{stk:STK-REQ-014}}, but left them untraced — no linkset exists between stakeholder-requirements and verification-requirements in AIRGen. This session resolved the gap by routing each VER entry through the most appropriate SYS requirement using the active system-requirements → verification-requirements linkset.

Trace links created this session (11):

VER entry	STK intent	SYS bridge	Rationale
{{sub:VER-REQ-083}}	Parent pre-flight check	{{sys:SYS-REQ-004}}	Failsafe design depends on parent confirming aircraft state
{{sub:VER-REQ-084}}	Per-cell charging	{{sys:SYS-REQ-005}}	Balance charger deep-discharge bench test
{{sub:VER-REQ-085}}	Kinetic energy limit	{{sys:SYS-REQ-011}}	Mass + airspeed measurement
{{sub:VER-REQ-086}}	Controlled descent	{{sys:SYS-REQ-004}}	Failsafe 500ms trigger
{{sub:VER-REQ-087}}	Commercial availability	{{sys:SYS-REQ-009}}	Out-of-box assembly time
{{sub:VER-REQ-088}}	Field repairability	{{sys:SYS-REQ-008}}	Crash-damage repair procedure
{{sub:VER-REQ-089}}	EN 71/ASTM F963	{{sys:SYS-REQ-012}}	Accredited lab test
{{sub:VER-REQ-090}}	250g mass limit	{{sys:SYS-REQ-011}}	Calibrated scale weighing
{{sub:VER-REQ-091}}	Complete packaging	{{sys:SYS-REQ-009}}	Unboxing inventory check
{{sub:VER-REQ-092}}	Safety labelling	{{sys:SYS-REQ-012}}	Labelling inspection
{{sub:VER-REQ-093}}	15-knot crosswind	{{sys:SYS-REQ-003}}	Stability augmentation flight test
{{sub:VER-REQ-094}}	FCC/CE compliance	{{sys:SYS-REQ-007}}	Radio test lab certification

Orphan count dropped from 19 to 7 (all ARC requirements — expected, acknowledged in session 489).

Propulsion subsystem internal block diagram:

flowchart TB
  n0["component - Electronic Speed Controller"]
  n1["component - MOSFET Half-Bridge"]
  n2["component - Gate Driver IC"]
  n3["component - ESC Microcontroller"]
  n4["component - Brushless DC Motor"]
  n5["component - Propeller"]
  n3 -->|PWM commutation| n2
  n2 -->|Gate signals| n1
  n1 -->|3-phase AC| n4
  n4 -->|Shaft torque| n5
  n0 -->|Contains| n3

Analysis

The most analogous entity surfaced by semantic search is the {{hex:55B77A18}} Communication Monitor from the surgical robot system — it monitors a 1kHz control link, uses consecutive-frame-loss as the primary trigger (3 frames), and holds the manipulator in its current position on link loss. The RC airplane uses a time-based threshold (500ms, equivalent to ~25 frames at 50Hz) rather than a frame-count threshold. This is structurally equivalent; the RC implementation is appropriate for consumer hardware where frame rate can vary across radio modules.

Five high-severity lint findings persist (all previously acknowledged): the {{trait:Biological/Biomimetic}} trait false-positive on {{hex:DEC81008}}, the esc entity {{hex:00000000}} artifact, and the lint-parsed kids remote control airplane shall display entity {{hex:D6C80008}} from SYS-REQ-012 text. None requires a new requirement. 9 previously acknowledged lint findings unchanged.

Requirements

No new requirements created this session. The engineering work was structural: closing trace gaps that blocked the verification coverage picture. The SYS→VER linkset proved active where STK→VER was not. All 14 STK requirements now have at least one direct VER entry in the verification record — 2 (STK-REQ-001, STK-REQ-002) via prior VER-REQ-036/037, 12 (STK-REQ-003 through STK-REQ-014) via VER-REQ-083 through VER-REQ-094.

Next

The project has completed its 10th session, meeting the quality gate. The harness should transition DECOMPOSITION_STATUS from qc-reviewed to validated on the next guard evaluation, or trigger a final SE_REVIEW pass. Outstanding medium-severity lint findings (83 coverage-gap entries) are largely noise from lint parsing requirement text fragments as concept tokens; the substantive gaps (receiver, propeller, FHSS control link) are already covered by existing SUB requirements and the lint mismatch is a tagging artefact. A brief review pass to confirm this before marking the system complete is the recommended next step.