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  2. Fixed ladder - Wikipedia

    en.wikipedia.org/wiki/Fixed_ladder

    Fixed ladders consist of the following components: Rungs: all fixed ladders have rungs, dictated by OSHA Standard 1910.27(b)(1) of no more than 12" (300 mm) on center (measured as the distance from the centerline of a rung to the center line of the next rung), and at 16" (410 mm) clear width.

  3. Height restriction laws - Wikipedia

    en.wikipedia.org/wiki/Height_restriction_laws

    Height restriction laws are laws that restrict the maximum height of structures. There are a variety of reasons for these measures. There are a variety of reasons for these measures. Some restrictions serve aesthetic values, such as blending in with other housing and not obscuring important landmarks.

  4. Pilot ladder - Wikipedia

    en.wikipedia.org/wiki/Pilot_ladder

    At a maximum interval of eight steps, the standard step is replaced by a spreader, which is an elongated version of the standard machined step, with a minimum length of 1.8 m (5 ft 11 in). The spreader's function is to prevent the ladder from twisting in the prevailing weather conditions when in use.

  5. Visual flight rules - Wikipedia

    en.wikipedia.org/wiki/Visual_flight_rules

    Though specific altitudes are called as noted below - there is an overreaching general requirement to maintain sufficient altitude that if a power unit fails, an emergency landing without undue hazard to persons or property on the surface can be made. This may be significantly higher than 500 feet or 1,000 feet. 500 ft rule

  6. Low-altitude parachute-extraction system - Wikipedia

    en.wikipedia.org/wiki/Low-altitude_parachute...

    The aircraft approaches the extraction zone in a manner similar to landing. On command of the pilot, the drogue chute is released and allowed to trail behind the aircraft on a tether. As the pilot flares and achieves a wheel height of 1-2 meters above ground, the drogue chute is allowed to pull the extraction chutes out into the airstream.

  7. Escalator - Wikipedia

    en.wikipedia.org/wiki/Escalator

    Similarly, the root word "scala" does not mean "a flight of steps", but is the singular form of the plural noun "scalae", which can denote any of: "a flight of steps or stairs, a staircase; a ladder, [or] a scaling-ladder." [21] The alleged intended capitalization of "escalator" is likewise a topic of debate. Seeberger's trademark application ...

  8. Kennedy Space Center Launch Complex 39 - Wikipedia

    en.wikipedia.org/wiki/Kennedy_Space_Center...

    The system included seven baskets suspended from seven slidewires that extended from the fixed service structure to a landing zone 370 meters (1,200 ft) to the west. Each basket could hold up to three people, which slid down the wire reaching up to 80 kilometers per hour (50 mph), eventually reaching a gentle stop by means of a braking system ...

  9. Interstate Highway standards - Wikipedia

    en.wikipedia.org/wiki/Interstate_Highway_standards

    Slopes in the clear zone should be at most 1:4, and should typically be 1:6. Curbs: No curb is to be placed nearer to the roadway than the outside edge of the paved shoulder. Any curb is to have a sloping, and not a vertical face, and be no more than 4 inches (10 cm) in height. Special care should be taken when curbs are combined with barriers.

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