Articles by Hasan Guclukaya

No Picture

Mayday / Panpan

What is a Mayday call, and when is it used? The radiotelephony (RT) spoken word Mayday indicates that an aircraft is threatened by grave and immediate danger and requests immediate assistance. A typical Mayday call…



No Picture

What are VASI lights?

Visual approach slope indicator (VASI) lights are a system used to provide slope guidance during the visual stage of the approach. They will assist pilots to maintain a stable descent path down to the runway…


No Picture

What is RVR?

Runway visual range (RVR) is a highly accurate instrument-derived visibility measurement that represents the range at which the runway’s high-intensity lights can be seen in the direction of landing along the runway. Its readings are…


No Picture

What is the definition of CAVOK?

When the following conditions occur simultaneously: 1. Visibility equal or greater than 10 km 2. No clouds below 5000 ft or below the highest minimum sector safe altitude (MSA), whichever is the greater, and no…


No Picture

OCA DA DH MEA MSA

What is OCH(A)? OCH is the obstacle clearance height above the aerodrome level (and so has relevance when using QFE). OCA is the obstacle clearance altitude above mean sea level (and so has relevance when…


No Picture

Weather Forecasts and Reports

The primary method of preflight meteorologic briefing for aircrew in most parts of the aviation world is self-briefing. This is done in one of two ways: 1. Using facilities, information, and documentation routinely available or…


No Picture

Temperature

Temperature is a measure of molecule agitation in a substance, which is represented as the hotness of a body. Therefore, temperature can be thought of as a measure of the hotness of a body. Factors…


No Picture

Latent Heat

Latent heat is the heat energy, measured in calories, absorbed or released when water changes from one state to another. There are three states of water: 1. Water vapor (gas) 2. Water liquid (cloud, mist,…


Icing

What is a deicing system? A deicing system is one in which ice is allowed to build up on a surface and is then removed, e.g., with pneumatic leading-edge boots. What is an anti-icing system?…