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This has been the cause of accidents, some of which were fatal or caused limb loss. Some luggage carts at airports and exercise treadmills have this feature. If the user falls or walks away without turning off the treadmill, the switch cuts power to the treadmill belt.

The purpose of this device, unlike other examples mentioned above, was fail-deadly rather than fail-safe. Once armed, the system would detonate the onboard nuclear weapons if the aircraft dropped below a predetermined level, [11] typically due to being shot down. There has also been a proposal to introduce a similar system to automotive cruise controls [ citation needed ].

A timer is established that is normally reset by the receipt of any valid command including one whose sole function is to reset the timer. If the timer expires, the spacecraft enters a "command loss" algorithm that cycles through a predefined sequence of hardware or software modes such as the selection of a backup command receiver until a valid command is received. The spacecraft may also enter a safe mode to protect itself while waiting for further commands.

It is generally called a watchdog timer , and is also used extensively in nuclear power control systems. Voyager 2 recovered from a command receiver failure with a command loss timer. If the driver is taken ill and releases this, the power will be shut off and an emergency brake application will be initiated to stop the train. A buzzer or bell sounds every minute or so in order to alert the motorman or engineer. Most major rail systems in the world use this equipment, both in their freight and passenger operations.

In the US, older locomotives produced before do not carry this feature, but given the modular nature of the system it is not uncommon to find them retrofitted. Some airplanes use vigilance control to minimize hypoxia , descending to lower altitude if the pilot is unresponsive.

This automation capability has been made possible by advancements in computing, control, and navigation technologies and is of particular importance in a general aviation setting since private aircraft are often flown by only a single pilot. From Wikipedia, the free encyclopedia. Equipment that activates upon the incapacitation of operator. This article is about a safety device used on vehicles and equipment.

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. See also: Sifa. Trains portal. Indianapolis Journal. Retrieved The train left Buckeye, Tenn. When Engineer A. He found Young dead and immediately stopped the train.

The train ran perhaps eight miles after Young was killed. The New York Times. Archived from the original on May 18, Retrieved May 7, Royal Yachting Association. Archived from the original on Chieftain Training. The Guardian. The Limits of Safety. Princeton University Press. ISBN Google Help. Schneiders IT. Jet Propulsion Laboratory.

Retrieved 4 March Aviation Publishing Group. Retrieved 15 April Retrieved 8 January Railway brakes. Brake van Diesel brake tender Diesel electric locomotive dynamic braking Electronically controlled pneumatic brakes Electro-pneumatic brake system on British railway trains Emergency brake train Retarder Dowty retarders.

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Then, they should paste the p2sh. After the timelock period has expired, the successor can use the following command to create a bitcoin transaction which spends the funds using the successor key:. Skip to content. Star 3.

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