aerial

In aviation maintenance, an aerial is an antenna mounted on an aircraft fuselage, wing, or tail that transmits and receives radio signals during flight. Unlike the ground-based definition, the term in aircraft work refers specifically to the physical device and its installation, not the medium itself. The aerial must function reliably at altitude, at speed, and across a wide range of temperatures and atmospheric pressures.

Aircraft carry multiple aerials for different purposes. VHF (Very High Frequency) communication aerials handle pilot-to-air traffic control voice traffic. UHF aerials support military or specialized frequencies. Navigation aerials include ILS (Instrument Landing System) localizer and glide slope receivers, plus VOR (VHF Omnidirectional Range) antennas. Transponder aerials transmit the aircraft's position and identification to radar systems on the ground. Each type has different impedance, frequency response, and installation requirements.

Common failures and inspection points

Aerials fail through corrosion, impact damage, cracking of the dielectric covering, and connector degradation. Salt spray and UV exposure degrade external surfaces. Impact from ground equipment, hail, or bird strikes can crack the radome (the protective cover) or bend the active element. Loose or corroded connectors cause intermittent signal loss and are among the most frequent maintenance findings. Periodic inspection includes checking for visible damage, verifying secure mounting, testing continuity of the feed line, and confirming signal strength in flight or on the ground test equipment.

The term 'aerial' derives from Latin aerius, relating to air, and remains the standard British and European aviation vocabulary. North American maintenance manuals often use 'antenna', though both terms are understood across the industry. Removal and replacement of aerials is routine maintenance work performed by licensed technicians according to manufacturer service bulletins, which specify torque values for mounting hardware, connector types, and re-test procedures to confirm proper operation post-installation.