FullDescription:Safety Nets

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Adequate warning time

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Term adequate warning time
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Safety Net (SNET)

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Abbreviation

Definition

The desired warning time for particular alerts given by a particular Safety Net in a particular region (SNET) type. The value is determined externally, based on human factors and aircraft performance considerations.

Definition Source

EUROCONTROL EATMP Glossary, June 2001

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Alert

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Term alert
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Definition

1. (EUROCONTROL) Indication of an actual or potential hazardous situation that requires particular attention or action.

2. (ICAO) An indication provided to other aircraft systems or annunciation to the pilot to identify that an operating parameter of a navigation system is out of tolerance.

Definition Source

1. EUROCONTROL (2009) "Safety Nets, Ensuring Effectiveness, Guide", Terms and definitions used in the EUROCONTROL Specifications

2. ICAO, Official definition added to An 10/I by Amdt 76 (01/11/2001)

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Alert limit

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Term alert limit
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alert

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Abbreviation

Definition

For a given parameter measurement, the error tolerance not to be exceeded without issuing an alert.

Definition Source

ICAO, Official definition, ANNEX 10/I Aeronautical Telecommunications — Radio Navigation Aids

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Approach Path Monitor

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Term Approach Path Monitor
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Controlled flight into terrain

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Ground-based safety net

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Abbreviation

APM

Definition

A ground-based safety net intended to warn the controller about increased risk of controlled flight into terrain accidents by generating, in a timely manner, an alert of aircraft proximity to terrain or obstacles during final approach.

Definition Source

EUROCONTROL (2009), "Safety Nets, Ensuring Effectiveness, Guide", Terms and definitions used in the EUROCONTROL Specifications, Change proposal for ICAO Doc 4444, §15.7.4 Note 1

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Area proximity warning

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Term Area proximity warning
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Ground-based safety net

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Abbreviation

APW

Definition

A ground-based safety net intended to warn the controller about unauthorised penetration of an airspace volume by generating, in a timely manner, an alert of a potential or actual infringement of the required spacing to that airspace volume.

Definition Source

EUROCONTROL (2009), "Safety Nets, Ensuring Effectiveness, Guide", Terms and definitions used in the EUROCONTROL Specifications

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False alert

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Term false alert
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Abbreviation

Definition

Alert which does not correspond to a situation requiring particular attention or action (e.g. caused by split tracks and radar reflections).

Definition Source

EUROCONTROL, (2009), "Safety Nets, Ensuring Effectiveness, Guide", Terms and definitions used in the EUROCONTROL Specifications

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Ground proximity warning system

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Term Ground proximity warning system
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Abbreviation

GPWS

Definition

A system which provides automatically a timely and distinctive warning to the flight crew when the aeroplane is in potentially hazardous proximity to the earth's surface.

Definition Source

ICAO Annex 6 (Para 6.15.4) to the Chicago Convention

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Ground-based safety net

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Term Ground-based safety net
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Approach Path Monitor

Area proximity warning

Minimum Safe Altitude Warning

Abbreviation

Definition

A ground-based safety net is a functionality within the ATM system that is assigned by the ANSP with the sole purpose of monitoring the environment of operations in order to provide timely alerts of an increased risk to flight safety which may include resolution advice.

Definition Source

EUROCONTROL (2009), "Safety Nets, Ensuring Effectiveness, Guide", Terms and definitions used in the EUROCONTROL Specifications

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Minimum Safe Altitude Warning

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Term Minimum Safe Altitude Warning
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Controlled flight into terrain

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Ground-based safety net

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Abbreviation

MSAW

Definition

A ground-based safety net intended to warn the controller about increased risk of controlled flight into terrain accidents by generating, in a timely manner, an alert of aircraft proximity to terrain or obstacles.

Definition Source

EUROCONTROL (2009), "Safety Nets, Ensuring Effectiveness, Guide", Terms and definitions used in the EUROCONTROL Specifications, Change proposal for Doc 4444 §15.7.4 Note 1

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Nuisance alert

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Term nuisance alert
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Abbreviation

Definition

Alert which is correctly generated according to the rule set but is considered operationally inappropriate.

Definition Source

EUROCONTROL, (2009), "Safety Nets, Ensuring Effectiveness, Guide", Terms and definitions used in the EUROCONTROL Specifications

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Safety Net

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Term Safety Net
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Short Term Conflict Alert

Minimum Safe Altitude Warning

Area proximity warning

Abbreviation

SNET

Definition

"...an airborne and/or ground based function within the ATM System whose sole purpose is to alert aircrew/ATCO of the imminence of a hazardous situation (e.g., risk of aircraft collision, terrain collision, or airspace penetration) so that it can be resolved in a timely manner."

Definition Source

EUROCONTROL, "Review of the Draft Updated ATM2000+ Strategy" (Provisional Council working paper)

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Separation

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Term separation
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Lateral separation

Vertical separation

Longitudinal separation

Abbreviation

Definition

Spacing between aircraft, levels or tracks.

Definition Source

ICAO, doc. 9426, 1984, p. V-1-1-11

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Separation minima

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Term separation minima
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separation

separation minima infringement

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Definition

The minimum displacements between an aircraft and a hazard which maintain the risk of collision at an acceptable level of safety.

Definition Source

ICAO (2008), doc. 9882, Manual on Air Traffic Management System Requirements

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Separation mode

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Term separation mode
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Definition

An approved set of rules, procedures and conditions of application associated with separation minima.

Definition Source

ICAO (2008), doc. 9882, Manual on Air Traffic Management System Requirements

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Separation provision

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Term separation provision
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Definition

The tactical process of keeping aircraft away from hazards by at least the appropriate separation minima.

Definition Source

ICAO (2008), doc. 9882, Manual on Air Traffic Management System Requirements

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Short Term Conflict Alert

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Term Short Term Conflict Alert
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Abbreviation

STCA

Definition

A ground-based safety net intended to assist the controller in preventing collision between aircraft by generating, in a timely manner, an alert of a potential or actual infringement of separation minima.

Definition Source

EUROCONTROL, (2009), "Safety Nets, Ensuring Effectiveness, Guide", Terms and definitions used in the EUROCONTROL Specifications,

Derived from ICAO Doc 4444, §15.7.2 Note 1

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Spacing

Link Semantic Value
Term spacing
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Abbreviation

Definition

Any application of a distance or time between an aircraft and a hazard at or above separation minima in order to maintain an orderly flow of traffic.

Definition Source

ICAO (2008), doc. 9882, Manual on Air Traffic Management System Requirements

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Terrain Awareness and Warning System

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Term Terrain Awareness and Warning System
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Abbreviation

TAWS

Definition

A timed-based system that provides information concerning potential hazards with fixed objects by using GPS positioning and a database of terrain and obstructions to provide true predictability of the upcoming terrain and obstacles.

Definition Source

FAA, Pilot's Handbook of Aeronautical Knowledge (2008), Glossary

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Traffic Alert and Collision Avoidance System

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Term Traffic Alert and Collision Avoidance System
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Airborne collision avoidance system

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TCAS

Definition

A type of airborne collision avoidance system (ACAS) based on a family of airborne equipment that functions independently of the ground-based ATC system to detect potential conflicting aircraft that are equipped with secondary surveillance radar (SSR) transponders.

Definition Source

Transport Canada, Glossary for Pilots and Air Traffic Services Personnel, URL: http://www.tc.gc.ca/eng/civilaviation/secretariat-terminology-glossary-205.htm

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There are three different versions: TCAS I provides traffic advisories; TCAS II provides traffic advisories and vertical resolution advisories (RA); and TCAS IV, when developed, will provide traffic advisories and vertical and horizontal RAs.

Warning time

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Term warning time
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Abbreviation

Definition

1) The time interval between potential threat or threat detection and closest approach when neither aircraft accelerates.

2) The amount of time between the first indication of an alert to the controller and the predicted hazardous situation.

Definition Source

1) ICAO, Official definition added to An 10/IV by Amdt 70 (9/11/1995)

2) EUROCONTROL, (2009), "Safety Nets, Ensuring Effectiveness, Guide", Terms and definitions used in the EUROCONTROL Specifications

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