PH.IX.A.R5

From the FAA library

• Helicopter Flying Handbookp. 12-4
  Chapter 12: Night Operations › Night Vision › Night Scanning

  Night Vision Diet and general physical health have an impact on how well a person can see in the dark. Deficiencies in vitamins A and C have been shown to reduce night acuity. Other factors, such as carbon monoxide poisoning ... smoking, alcohol, and certain drugs can greatly decrease night vision. Lack of oxygen can also decrease night vision as the eye requires more oxygen per unit weight than any other part of the body. Night Scanning Good night visual acuity…

• Pilot's Handbook of Aeronautical Knowledgep. 17-22
  Chapter 17: Aeromedical Factors › Vision in Flight › Night Blind Spot

  Night Vision There are many good reasons to fly at night, but pilots must keep in mind that the risks of night flying are different than during the day and often times higher. [Figure 17-16] Pilots who are cautious ... educated on night-flying techniques can mitigate those risks and become very comfortable and proficient in the task. Night Blind Spot It is estimated that once fully adapted to darkness, the rods are 10,000 times more sensitive to light…

• Helicopter Flying Handbookp. 12-8
  Chapter 12: Night Operations › Night Flight › Takeoff

  Night Traffic Patterns Traffic patterns are covered in Chapter 9, Basic Flight Maneuvers, but the following additional considerations should be taken into account when flying a helicopter in a night traffic pattern: 1. The minimum recommended pattern height at night ... feet when able. 2. If possible, consider taking the right hand night pattern with fixed wing in the left hand pattern for extra separation, but if needed, conform and integrate with the fixed wing using the same pattern height…

• Helicopter Flying Handbookp. 12-5
  Chapter 12: Night Operations › Night Vision › Aircraft Lighting

  looking for the support structures. However, pilots should review the most current hazard maps with known wire locations before night flights. Aircraft Lighting In order to see other aircraft more clearly, regulations require that all aircraft operating during the night ... hours have special lights and equipment. The requirements for operating at night are found in Title 14 of the Code of Federal Regulations (14 CFR) part 91. In addition to aircraft lighting, the regulations also provide a definition of night…

• Helicopter Flying Handbookp. 12-2
  Chapter 12: Night Operations › Visual Deficiencies › Night Myopia

  Visual Deficiencies Night Myopia At night, blue wavelengths of light prevail in the visible portion of the spectrum. Therefore, slightly nearsighted (myopic) individuals viewing blue-green light at night may experience blurred vision. Even pilots with perfect vision find that ... position and make the eye more myopic. These factors become important when pilots rely on terrain features during unaided night flights. Practicing good light discipline is very important and helps pilots to retain their night adaptation. Keeping the cockpit lighting…

• Helicopter Flying Handbookp. 12-10
  Chapter 12: Night Operations › Helicopter Night VFR Operations

  have enough reflectivity or cultural lighting to ever be characterized as a high lighting area. Through the accumulation of night flying experience in a particular area, the pilot develops the ability to determine, prior to departure, which areas ... lighting conditions are observed or determined to be regularly available. Even if the aircraft is certified for day and night VFR conditions, night flight should only be conducted if adequate celestial illumination is assured during the entirety of the flight…