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- Q991206 subject Q6913774.
- Q991206 subject Q7583981.
- Q991206 subject Q8281165.
- Q991206 abstract "In aviation, a brownout (or brown-out) is an in-flight visibility restriction due to dust or sand in the air.In a brownout, the pilot cannot see nearby objects which provide the outside visual references necessary to control the aircraft near the ground. This can cause spatial disorientation and loss of situational awareness leading to an accident. Pilots have compared landing during brownouts to parallel parking an automobile with one's eyes closed.The brownout phenomenon causes accidents during helicopter landing and take-off operations in arid desert terrain. Intense, blinding dust clouds stirred up by the helicopter rotor downwash during near-ground flight causes significant flight safety risks from aircraft and ground obstacle collisions, and dynamic rollover due to sloped and uneven terrain. Brownouts have claimed more helicopters in recent military operations than all other threats combined.There are several factors which affect the probability and severity of brownout:rotor disk loadingrotor configurationsoil compositionwindapproach speed and angleCountermeasures to prevent brownout-related accidents include:Site preparationPilot techniqueSynthetic vision systems also known as "see and remember"Upgraded horizontal situation indicator with improved symbologyAerodynamics such as the "winged rotor" on the AgustaWestland EH101Non-visual displays of position and orientation data derived from suitable sensors, such as Tactile Situational Awareness Systems (TSAS) providing information to the pilot through the sense of touch using tactors.↑ ↑ ↑ ↑ ↑ ↑ 6.0 6.1 ↑ ↑ ↑".
- Q991206 thumbnail USAF_HC-130_Hercules_aircraft_gets_a_brownout_from_the_rotor_wash_of_an_HH-60_Pave_Hawk_helicopter.jpg?width=300.
- Q991206 wikiPageExternalLink the-kopp-etchells-effect.htm.
- Q991206 wikiPageExternalLink Battling-Brownouts.
- Q991206 wikiPageWikiLink Q1050858.
- Q991206 wikiPageWikiLink Q1088655.
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- Q991206 wikiPageWikiLink Q7583981.
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- Q991206 wikiPageWikiLink Q8281165.
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- Q991206 wikiPageWikiLink Q99.
- Q991206 comment "In aviation, a brownout (or brown-out) is an in-flight visibility restriction due to dust or sand in the air.In a brownout, the pilot cannot see nearby objects which provide the outside visual references necessary to control the aircraft near the ground. This can cause spatial disorientation and loss of situational awareness leading to an accident.".
- Q991206 label "Brownout (aeronautics)".
- Q991206 depiction USAF_HC-130_Hercules_aircraft_gets_a_brownout_from_the_rotor_wash_of_an_HH-60_Pave_Hawk_helicopter.jpg.