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The unit is then checked, but no anomaly is detected by the maintainer. Consequently, the unit is returned to service with no repair performed. [1] [2] [3] If there is an underlying fault that has not been detected the unit may be returned for repair several times with no fault identified. Alternative descriptors include: [4] No fault found (NFF)
Clamshell type thrust reversers deployed on the CFM56 engine of an Airbus A321. Thrust reversal, also called reverse thrust, is the temporary diversion of an aircraft engine's thrust for it to act against the forward travel of the aircraft, providing deceleration.
Two approaches can be distinguished: A direct pattern recognition of sensor readings that indicate a fault and an analysis of the discrepancy between the sensor readings and expected values, derived from some model. In the latter case, it is typical that a fault is said to be detected if the discrepancy or residual goes above a certain ...
In telecommunications and computing, backward compatibility (or backwards compatibility) is a property of an operating system, software, real-world product, or technology that allows for interoperability with an older legacy system, or with input designed for such a system.
The Tupolev Tu-4, a Soviet bomber built by reverse engineering captured Boeing B-29 Superfortresses. Reverse engineering (also known as backwards engineering or back engineering) is a process or method through which one attempts to understand through deductive reasoning how a previously made device, process, system, or piece of software accomplishes a task with very little (if any) insight ...
However, if the spring is too weak to always move the rooster comb to the bottom of the trough between the teeth, the vehicle can be left between gears. On certain U.S. car manufacturers' vehicles, the problem is made worse as there is a flat spot between "Park" and "Reverse" detents where the ball can rest, also resulting in a "false park".
Forward compatibility or upward compatibility is a design characteristic that allows a system to accept input intended for a later version of itself. The concept can be applied to entire systems, electrical interfaces, telecommunication signals, data communication protocols, file formats, and programming languages.
Whereas the fail-stop failure mode simply means that the only way to fail is a node crash, detected by other nodes, Byzantine failures imply no restrictions on what errors can be created, which means that a failed node can generate arbitrary data, including data that makes it appear like a functioning node to a subset of other nodes. Thus ...