H

Question 1

Hazardous altitudes

Answer 1

An inherent quality of rotating
bodies, which causes an applied force to be manifested 90°
in the direction of rotation from the point where the force
is applied.

Question 2

Hazardous Inflight Weather Advisory Service (HIWAS)

Answer 2

Service providing recorded weather forecasts broadcast to

airborne pilots over selected VORs.

Question 3

Head-up Display (HUD)

Answer 3

A special type of flight viewing
screen that allows the pilot to watch the flight instruments
and other data while looking through the windshield of the
aircraft for other traffic, the approach lights, or the runway

Question 4

Heading

Answer 4

The direction in which the nose of the aircraft is pointing during flight.

Question 5

Heading indicator

Answer 5

An instrument which senses airplane
movement and displays heading based on a 360° azimuth,
with the final zero omitted. The heading indicator, also called
a directional gyro (DG), is fundamentally a mechanical
instrument designed to facilitate the use of the magnetic
compass. The heading indicator is not affected by the forces
that make the magnetic compass difficult to interpret.

Question 6

Headwork

Answer 6

Required to accomplish a conscious, rational process when making decision. Good decision-making involves risk identification and assessment, information processing, and problem solving.

Question 7

Height Above Airport (HAA)

Answer 7

The height of the MDA above the published airport elevation

Question 8

Height Above Landing (HAL)

Answer 8

The height above a designated helicopter landing area used for helicopter instrument approach procedures.

Question 9

Height Above Touchdown elevation (HAT)

Answer 9

The DA/DH or MDA above the highest runway elevation in the touchdown zone (First 3000 feet of the runway)

Question 10

HF

Answer 10

High frequency

Question 11

Hg

Answer 11

Abbreviation for mercury, from the Latin hydrargyrum

Question 12

High performance aircraft

Answer 12

An aircraft with an engine of more than 200 horsepower.

Question 13

Histotoxic hypoxia

Answer 13

The inability of cells to effectively use oxygen. Plenty of oxygen is being transported to the cells that need it, but they are unable to use it.

Question 14

Holding

Answer 14

A predetermined maneuver that keeps aircraft
within a specified airspace while awaiting further clearance
from ATC.

Question 15

Holding pattern

Answer 15

A racetrack pattern, involving two turns
and two legs, used to keep an aircraft within a prescribed
airspace with respect to a geographic fix. A standard pattern
uses right turns; nonstandard patterns use left turns.

Question 16

Homing

Answer 16

Flying the aircraft on any heading required to keep

the needle pointing to the 0° relative bearing position.

Question 17

Horizontal Situation Indicator (HSI)

Answer 17

A flight navigation
instrument that combines the heading indicator with a CDI,
in order to provide the pilot with better situational awareness
of location with respect to the courseline.

Question 18

Horsepower

Answer 18

The term, originated by inventor James Watt,
means the amount of work a horse could do in one second.
One horsepower equals 550 foot-pounds per second, or
33,000 foot-pounds per minute.

Question 19

Hot start

Answer 19

In gas turbine engines, a start which occurs with
normal engine rotation, but exhaust temperature exceeds
prescribed limits. This is usually caused by an excessively
rich mixture in the combustor. The fuel to the engine must
be terminated immediately to prevent engine damage.

Question 20

Human factors

Answer 20

A multidisciplinary field encompassing the
behavioral and social sciences, engineering, and physiology,
to consider the variables that influence individual and
crew performance for the purpose of optimizing human
performance and reducing errors.

Question 21

Hung start

Answer 21

In gas turbine engines, a condition of normal
light off but with rpm remaining at some low value rather than
increasing to the normal idle rpm. This is often the result of
insufficient power to the engine from the starter. In the event
of a hung start, the engine should be shut down.

Question 22

Hydroplaning

Answer 22

A condition that exists when landing on a
surface with standing water deeper than the tread depth of
the tires. When the brakes are applied, there is a possibility
that the brake will lock up and the tire will ride on the
surface of the water, much like a water ski. When the tires
are hydroplaning, directional control and braking action
are virtually impossible. An effective anti-skid system can
minimize the effects of hydroplaning.

Question 23

Hypemic hypoxia

Answer 23

A type of hypoxia that is a result of
oxygen deficiency in the blood, rather than a lack of inhaled
oxygen. It can be caused by a variety of factors. Hypemic
means “not enough blood.”

Question 24

Hyperventilation

Answer 24

Occurs when an individual is experiencing
emotional stress, fright, or pain, and the breathing rate and
depth increase, although the carbon dioxide level in the
blood is already at a reduced level. The result is an excessive
loss of carbon dioxide from the body, which can lead to
unconsciousness due to the respiratory system’s overriding
mechanism to regain control of breathing.

Question 25

Hypoxia

Answer 25

A state of oxygen deficiency in the body sufficient

to impair functions of the brain and other organs.

Question 26

Hypoxic hypoxia

Answer 26

This type of hypoxia is a result of
insufficient oxygen available to the lungs. A decrease of
oxygen molecules at sufficient pressure can lead to hypoxic
hypoxia.