Desviaciones De Altitud

-1Grupo de Trabajo de Scrutinio (GTE) Large Height Deviation (LHD)
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Description of Criteria
Note: The following terms, expressions and definitions are not approved by the ICAO’sCouncil and should be used for analysis of Large Height Deviation purpose only.
Cleared Flight Level – the flight level at which the pilot was cleared or currently
operating (eg, Aircrew accepts aclearance intended for another aircraft and ATC fails to
capture the read back error or aircrew conforms to a flawed clearance delivered by ATC)
Reference Flight Level – The altitude that would haveprovided at least the minimum
separation (vertical or horizontal) required
That flight level from which the Height Deviation is calculated; this level may be
different from the Cleared Flight Level andmust often be determined by the Scrutiny
Group operational experts from the data in the Large Height Deviation report
Event Flight Level – the flight level of error, the incorrect altitude ofoperation for an
identifiable period of time without having received an ATC clearance
Height Deviation – any altitude variation of 300ft or greater from the assigned altitude,
these variations can be theresult of turbulence, equipment malfunction, ATC loop errors,
etc.
ATC Loop Errors – any incident where there is a misunderstanding between the pilot
and the controller, failure to properlycoordinate altitude information or unable to
maintain situational awareness
Total Deviation – the total amount of feet between the altitudes of current operation
prior to the deviation and the point atwhich the aircraft is once again under ATC
supervision, a deviation that resulted in an increase of altitude will be recorded as a
positive number, a deviation that resulted in a decrease of altitudewill be recorded as a
negative number
Hazard Zone – 300ft buffer zone above and below each flight level (Diagram 1-A)
Duration - length of time that an aircraft was level at an altitude that was...