Section 24 of 83
23. Locking and Release
Stable section ID: S05-CON-005-SECTION-24 · 27 content blocks
Locking preserves the required relationship between connected interfaces after alignment and seating. Release intentionally removes that restraint through a controlled procedure.
A System05 interface may contain:
Primary Lock: carries the principal retention or structural action;
Secondary Retention: prevents separation if the primary lock becomes incomplete or unintentionally releases;
Preload Mechanism: removes clearance or establishes clamping force;
Tamper Control: prevents unauthorized operation;
State Indicator: shows the actual lock condition;
Release Mechanism: permits controlled disassembly.
Acceptable locking technologies may include bolts, pins, wedges, cams, latches, threaded collars, bayonet locks, clamps, captive fasteners, interference mechanisms, or other validated devices. Selection shall depend upon load, reversibility, access, cycle count, environmental exposure, fire behavior, manufacturing capability, and robotic operation.
The Locking Interface Specification shall define:
locking direction and sequence;
required force, displacement, torque, rotation, or tension;
final lock position;
permitted residual clearance;
preload requirements;
locking-tool requirements;
verification method;
secondary-retention requirements;
authorized release method;
expected cycle life;
inspection and replacement criteria.
Torque alone shall not be assumed to prove bolt preload where friction variability makes the relationship unreliable. Critical connections may require direct-tension indicators, controlled-turn procedures, load-sensing fasteners, calibrated tools, or physical testing.
The actual lock state shall be distinguishable from the commanded lock state. A control system indicating “lock” shall not establish compliance unless physical completion is verified.
Release shall require deliberate action. Safety-critical interfaces shall not be releasable by vibration, ordinary occupant contact, software error, loss of power, or a single unintended command.
Where the interface remains loaded or energized, release shall be mechanically or logically inhibited until safe preconditions are satisfied.
The preferred System05 principle is that frequently replaced components use non-destructive, captive, and reusable locking elements. Single-use locking components shall be identified, recorded, and replaced after every release.
Standard lock families and their capacity ranges remain TBD pending reference-design evaluation.