Pilot/Controller Glossary 

4/20/23 

procedures for pilots to follow in the event of lost communications during a radar approach when weather reports 

indicate that an aircraft will likely encounter IFR weather conditions during the approach. 

(Refer to 14 CFR Part 91.) 
(Refer to AIM.) 

LOST LINK (LL)

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 An interruption or loss of the control link, or when the pilot is unable to effect control of 

the aircraft and, as a result, the UA will perform a predictable or planned maneuver.  Loss of command and control 

link between the Control Station and the aircraft.  There are two types of links: 

a. 

An uplink which transmits command instructions to the aircraft, and 

b. 

A downlink which transmits the status of the aircraft and provides situational awareness to the pilot. 

LOST LINK PROCEDURE

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 Preprogrammed or predetermined mitigations to ensure the continued safe 

operation of the UA in the event of a lost link (LL). In the event positive link cannot be established, flight 

termination must be implemented. 
LOW ALTITUDE AIRWAY STRUCTURE

−

 The network of airways serving aircraft operations up to but not 

including 18,000 feet MSL. 

(See AIRWAY.) 
(Refer to AIM.) 

LOW ALTITUDE ALERT, CHECK YOUR ALTITUDE IMMEDIATELY

−

 

(See SAFETY ALERT.) 

LOW ALTITUDE AUTHORIZATION AND NOTIFICATION CAPABILITY (LAANC)

−

 FAA and industry 

collaboration which automates the process of obtaining a required authorization for operations in controlled 

airspace. 
LOW APPROACH

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 An approach over an airport or runway following an instrument approach or a VFR 

approach including the go-around maneuver where the pilot intentionally does not make contact with the runway. 

(Refer to AIM.) 

LOW FREQUENCY (LF)

−

 The frequency band between 30 and 300 kHz. 

(Refer to AIM.) 

LOCALIZER PERFORMANCE WITH VERTICAL GUIDANCE (LPV)

−

 A type of approach with vertical 

guidance (APV) based on WAAS, published on RNAV (GPS) approach charts. This procedure takes advantage 

of the precise lateral guidance available from WAAS. The minima is published as a decision altitude (DA). 
LUAW

−

 

(See LINE UP AND WAIT.) 

PCG L

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