Stability in storage comes from restraining how loads are arranged. When containers are stacked, blocked to prevent movement, interlocked with neighboring units, and kept to a limited height, the whole stack behaves as a single, solid unit. This minimizes the chance of sliding, shifting, or toppling under vibration, braking, or handling. Storing on open shelves without constraints allows horizontal movement; piling loosely offers little friction or structural support; and hanging from overhead hooks introduces dynamic loads and requires special rigging—neither approach reliably prevents collapse. Therefore, stacking, blocking, interlocking, and limiting height is the best practice to prevent sliding, falling, or collapse.

State changes that happen without a clock are called asynchronous. In asynchronous circuits, outputs respond directly to input changes or events, not to a clock edge. This is in contrast to synchronous (clocked) designs, where all updates occur at defined clock transitions, ensuring timing coordination. A latch is a storage element that can be level-sensitive, often used in various timing schemes, but the question’s focus is on clock governance, which is captured by the term asynchronous.

The main current path in a transistor is between the collector and emitter, while the base provides the small control current. In normal operation, the collector current is the larger, output-serving current because it is amplified by the transistor (I_C is roughly β times I_B). The emitter current is the sum of base and collector currents (I_E = I_B + I_C), so it isn’t the primary output in typical configurations. The base is just the control input, and the gate is a control terminal in MOSFETs, not the main load-carrying path. Therefore, the terminal that carries the main output current is the collector.

The main idea is the Minimum Equipment List. This is an FAA-approved document that lists which installed instruments or equipment may be inoperative and still allow the aircraft to continue flight, with specific limitations and conditions. The MEL is crafted to reflect safe operation with certain systems failed, outlining what must be repaired by when, and what alternate procedures or limits apply for dispatch. That FAA approval is essential, so phrasing it as an FAA-approved Minimum Equipment List precisely matches the description. The other concepts don’t fit because a standard equipment list doesn’t address allowable inoperative items, and while an MEL is often referred to simply as the MEL, the key point is that it’s FAA-approved and specifically governs inoperative equipment during flight.