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SVFR can only be conducted below 10,000 feet MSL in such areas. [2] [3] SVFR at night requires an IFR-equipped aircraft and an IFR-rated pilot in command ("IFR" means Instrument flight rules). In helicopters, there is no minimum flight visibility requirement, or a requirement for an IFR-equipped aircraft or an IFR-rated pilot in command. [2]
Member states are allowed to modify the low flying rule to suit their jurisdiction, for instance in the UK, the "500 ft Rule" allows pilots to fly below 500 ft as long as they are no closer than 500 ft to any person, vessel, vehicle, building or structure. The rules for flying near congested areas are the same in the UK as the rest of the EU [12]
Three different concepts of "night" are referred to in the Federal Aviation Regulations in the US. These include the periods from sunset to sunrise - used for nav lights,; the end of evening civil twilight to the beginning of morning civil twilight (this is the "standard definition of night", given in FAR Section 1.1) - used for logging night flight,
The night rating is a prerequisite for the issue of a Commercial Pilot Licence. [4] In Australia, the qualification is known as a "Night VFR rating", and requires 10 hours of flight time at night in an aircraft or simulator, including at least 5 hours of cross-country flight at night in an aircraft. [5] A night rating does not expire. [3] [5]
Claudication is most common in the calves but it can also affect the feet, thighs, hips, buttocks, or arms. [2] The word claudication comes from Latin claudicare 'to limp'. Claudication that appears after a short amount of walking may sometimes be described by US medical professionals by the number of typical city street blocks that the patient ...
Severe pain caused by claudication can lead to a person having very restricted ability to move, and pain while resting is often a sign that the condition has worsened. Claudication is also considered a symptom of peripheral artery disease. [9] Popliteal bypass surgery may be performed on people with the following symptoms and conditions: [10]
Intermittent claudication is a symptom and is by definition diagnosed by a patient reporting a history of leg pain with walking relieved by rest. However, as other conditions such as sciatica can mimic intermittent claudication, testing is often performed to confirm the diagnosis of peripheral artery disease .
False visual reference illusions may cause the pilot to orient the aircraft in relation to a false horizon; these illusions can be caused by flying over a banked cloud, night flying over featureless terrain with ground lights that are indistinguishable from a dark sky with stars, or night flying over a featureless terrain with a clearly defined ...