Night check ride study Flashcards
somotogyral
Leans: most common. pilot fails to perceive angular motion. May roll from a bank and perceptions disagree with attitude indicator
Graveyard spins: common w/ fixed wing. pilot enters a spin and remains in it for several seconds. Semi circular canals reach equilibrium and when pilot recovers, pilot feels spinning in opposite direction.
Coriolis: most dangerous/can cause overwhelming disorientation. Occurs during prolonged turn and pilot makes a head motion in a different geometric plane.
somatogravic
Oculogravic: a/c accel/decel. Inertial from linear accel/decel cause otolith organ to sense nose high or low. (accel=high, decel=low)
Oculoagravic: opposite elevator illusion. result of downward movement of a/c. (eyes track up)
Elevator: caused by upward accel/updraft. because of this, eyes will track down when nose rising.
proprioceptive illusions
feeds into other illusions. w/out vis ref, pilot may feel like he is climbing while in a turn due to G forces.
NVG considerations
“Calmwadsos”
Color: no colors in NVG, (monochromatic)
Airpseed limits: don’t outfly the vis. from A/C
Lights:Be aware of whiteout, halo, tunnel vis, ABC
Magnification: no mag
Weather: may accidentally fly into IMC, fog/drizzle
Aircraft lighting: no red lights but blue/gr. ok.
Distance estimation and depth perception: difficult
Scanning techniques: turn head and eyes.
Obstruction Detection: wires/towers hard to see,
affected by ambient light/moon angle.
Spatial D: Avoid excessive or abrupt attitude changes, 30deg max recommended.
NVG characteristics
“DIALVP”
definition: helmet mounted, binocular, light intensification device that allows aircrews to conduct ops at terrain flight altitudes during low levels of light.
Intensification: 2000-3500times.
Acuity: best NVG acuity under ideal conditions and correct OSAP is 20/40; however, this is when looking at center of tubes.
Limited field of view: 40degree.
Voltage low indicator: Red LED on helmet mount will come on when v drops 2.4. Appx 30min of operation remain.
Power supply:
Lithium battery (3vdc)
AA alkaline (1.5vdc)
handheld pwr supply
Spatial D: 3 kinds of illusions:
vis: most reliable/80%. some illusions misinterpret and what is perceived is not always accurate.
vestibular: accurate info as long as not on the ground
proprioceptive: input to the brain may be inaccurate (during turns, banks, climbs, and descending maneuvers).
types of stress?
Physiological: self imposed “DEATH”
Environmental: “ASHAAI” alt, speed, hot/cold, a/c
design, airframe characteristics
Psychosocial: “JIF” Job stress, illness, family issues
Cognitive: “MCF” must/shoulds, choice or no choice,
failure to focus on here and now (overemphasizing
past).
Types of hypoxia
Stages
Hypoxic
Hypemic
Stagnet
Histotoxic
Indefferent (0-10k) Decr. night vis
Compensatory: (10-15) Drowsiness, judgment
coordination impaired efficiency.
Disturbance (15-20) impaired flight controls,
handwriting, speech, fintellectual function,
judgement, vision, decr. coord., sensation to pain,
memory.
Critical (20-25) Circulatory failure, CNS failure,
Convulsions, Cardiovascular, Collapse
Death.
