· AC - alternating current
· ACP - audio control panel
· alt - alternate
· altn - alternate
· app - approach
· ARINC - Aeronautical Radio, Inc.
· BITE - built-in test equipment
· BL - buttock line
· CAPT - captain
· DC - direct current
· DEU - display electronics unit
· DME - distance measurement equipment
· EFIS - electronic flight instrument system
· F/O - first officer
· FCC - flight control computer
· FDAU - flight data acquisition unit
· FMC - flight management computer
· freq - frequency
· fwd - forward
· grd - ground
· ILS - instrument landing system
· LCD - liquid crystal display
· LED - light emitting diode
· LRU - line replaceable unit
· maint - maintenance
· MHz - megahertz
· MMR - multi-mode receiver
· MKR - marker beacon
· NAV - navigation
· NCD - no computed data
· ND - navigation display
· norm - normal
· PFD - primary flight display