Glossary hub

Aviation glossary — full A–Z index

Every published term in the Sofema knowledge base glossary, with sourced definitions and regulatory context. 18 terms and growing.

A

ACFT Aircraft Standard abbreviation used in maintenance and ops documentation

E

EFOB Estimated Fuel on Board Projected fuel quantity at a given point in the flight plan

F

FO First Officer Second-in-command pilot in a multi-crew flight deck FOT Flight Operations Training Training related to flight operational procedures and compliance FW Fixed Wing Aircraft classification distinguishing from rotary-wing types

G

GHA Ground Handling Agent Agent or representative supporting airline activity at a station

I

IAW In accordance with Standard compliance reference in maintenance documentation INOP Inoperative Marks a system or component as unavailable for normal use

O

OBRM On-Board Replaceable Module Line-replaceable electronic module in aircraft avionics systems OPS Operations Flight operations and ground operations in an EASA context

P

PAX Passenger Passenger count and operational context in flight ops PROT Protection System protection modes and flight envelope protection context

R

RAIM Receiver Autonomous Integrity Monitoring GPS self-check function used in aviation navigation systems

S

SEQS Sequences Operational sequencing in aviation planning and scheduling SW Software / Service Work Multiple aviation meanings — context determines which applies

T

TRTO Type Rating Training Organisation Approved organisation providing type-specific pilot training

V

VH Maximum speed in level flight V-speed designation for maximum velocity at maximum continuous power VOL Volume / Voluntary Context-dependent — flight manual volume or voluntary reporting