Telemetry Polling Lag & Stale State Latching
Sub-Type: Asynchronous Sensor Update Freeze
Sensor acquisition thread drops update cycles but UI displays last-known good values with no freshness indicator, deceiving decision nodes into assuming steady state.
Fundamental Invariant Rules
Engineered Resilience & Mitigation Strategies
Canonical Incident Manifestations (4)
FAA Emergency Airworthiness Directive: AOA Resolver Stale State Freezes
Physical sensor state frozen due to hardware anomaly. Telemetry_Channel continued latching last-known good values to Decision_Node without state invalidation timestamp.
CISA Advisory ICSA-21-084: SCADA Modbus PLC Stale Register Latching
Network buffer congestion desynchronized PLC internal registers from physical sensors. Status telemetry reported healthy communication while physical Constraint_Boundary was breached.
Air France Flight 447: Pitot Tube High-Altitude Icing & Dual Side-Stick Cancellation
Transient physical Telemetry_Channel blockage triggered automation disconnect. Decision_Node executed continuous contradictory control inputs, which remained unobserved by supervisory node due to decoupled side-stick physical telemetry.
Boeing Starliner CFT-1: Helium Flange Leaks & Reaction Control Thruster Thermal Deselection
Thermal saturation degraded physical valve seal Buffer_Reserves. Flight control software automated health checks detected performance delta and permanently deselected thruster Decision_Nodes, trapping spacecraft in degraded operational state.