Abbreviations and Acronyms

· A/P - autopilot

· AC - alternating current

· ACP - audio control panel

· ALT - alternate

· AMP - amplifier

· B - both

· BITE - built-in test equipment

· CDS - common display system

· DEU - display electronics unit

· DME - distance measuring equipment

· FDAU - flight data acquisition unit

· DU - display unit

· FT - functional test

· GND - ground

· Hz - hertz

· I/C - intercom

· ILS - instrument landing system

· IM - inner marker

· I/O - input/output

· LCD - liquid crystal display

· LED - light emitting diode

· LRU - line replaceable unit

· MAINT - maintenance

· MB - marker beacon

· MHz - mega hertz

· MM - middle marker

· NAV - navigation

· NC - not connected

· ND - navigation display

· NORM - normal

· NVM - non-volatile memory

· OM - outer marker

· PFD - primary flight display

· R - range

· REU - remote electronics unit

· RF - radio frequency

· R/T - receive/transmit

· RCVR - receiver

· STA - station

· TFR - transfer

· V - voice

· V - volt

· VHF - very high frequency

· VOR - vhf omnidirectional ranging