VEF

EASA defines “VEF” in one regulation. The wording below is reproduced verbatim from the EASA Easy Access Rules, with a link to the paragraph it comes from.

‘VEF’ means the speed at which the critical engine is assumed to fail during take-off;

Annex I — Definitions for terms used in Annexes II to IX · Air Operations · Regulation (EU) No 965/2012 · Easy Access Rules, 27 Mar 2026 revision · Read the article

Also in the aviation glossary

VEF FAA PHAK: Calibrated airspeed at which the critical engine of a multi-engine aircraft is assumed to fail.

Defined in the same article

accelerate-stop distance available (ASDA)
acceptable means of compliance (AMC)
acceptance checklist
adequate aerodrome
adequate vertiport
adult
aerodrome operating minima
aided night vision imaging system (NVIS) flight

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