Altimetry

Question 1

Define Pressure

Answer 1

Force per unit area

Question 2

What is a hectopascal?

Answer 2

1000 dynes per cm^2

Question 3

Define Height

Answer 3

Vertical positions of a level, a point or object measured from a specific datum, other than MSL

Question 4

Define Altitude

Answer 4

Vertical position of a level, point or object measured from MSL

Question 5

Define Elavation

Answer 5

Vertical position of an object affixed to or on the surface of the Earth, measured from MSL.

Question 6

Define QFE

Answer 6

Atmospheric pressure corrected to a specific elevation.

Question 7

Define QNH

Answer 7

Atmospheric pressure corrected to MSL, assuming ISA

Question 8

Define Aerodrome Elavation

Answer 8

Elevation of the highest point on the landing area, upon which the height of the visual manoeuvring circling is based, for each runway.

Question 9

Define Threshold Elavation

Answer 9

Elavation of the threshold of the runway. Given if lower than 7ft from the point of highest elevation

Question 10

Transition Altitude

Answer 10

Altitude at or below which the vertical position of an aircraft is controlled by reference to altitudes.

Question 11

Transition Level

Answer 11

Lowest flight level available for use above transition altitude

Question 12

What altimeter settings are used at each stage of flight?

Answer 12

Take-off - QNH/QFE
Climb - QNH until TA, then Standard Setting
En-route - Standard Setting
Descent - QNH After TL
Landing - QNH (QFH if requested)
Missed approach - QNH though may have to be passed again

Question 13

What are Regional Pressure Settings used for?

Answer 13

For terrain clearances and to establish the transition level where applicable.
Derived from the lowest QNH as reported in 1 or 2 hours periods

Question 14

Define Flight Level:

Answer 14

A surface of constant atmospheric pressure, which is related to a specific pressure datum, 1013.25hpa, and is seperated from other such surfaces by specific pressure intervals.