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6/17/21 

Pilot/Controller Glossary 

landing. The route of flight and altitude are shown on 
instrument approach procedure charts. A pilot 
executing a missed approach prior to the Missed 
Approach Point (MAP) must continue along the final 
approach to the MAP. 

b. 

A term used by the pilot to inform ATC that 

he/she is executing the missed approach. 

c. 

At locations where ATC radar service is 

provided, the pilot should conform to radar vectors 
when provided by ATC in lieu of the published 
missed approach procedure. 

(See MISSED APPROACH POINT.) 

(Refer to AIM.) 

MISSED APPROACH POINT (MAP)

 A point 

prescribed in each instrument approach procedure at 
which a missed approach procedure shall be executed 
if the required visual reference does not exist. 

(See MISSED APPROACH.) 

(See SEGMENTS OF AN INSTRUMENT 

APPROACH PROCEDURE.) 

MISSED APPROACH PROCEDURE [ICAO]

 The 

procedure to be followed if the approach cannot be 
continued. 

MISSED APPROACH SEGMENT

 

(See SEGMENTS OF AN INSTRUMENT 

APPROACH PROCEDURE.) 

MLDI

 

(See METER LIST DISPLAY INTERVAL.) 

MM

 

(See MIDDLE MARKER.) 

MOA

 

(See MILITARY OPERATIONS AREA.) 

MOCA

 

(See MINIMUM OBSTRUCTION CLEARANCE 

ALTITUDE.) 

MODE

 The letter or number assigned to a specific 

pulse spacing of radio signals transmitted or received 
by ground interrogator or airborne transponder 
components of the Air Traffic Control Radar Beacon 
System (ATCRBS). Mode A (military Mode 3) and 

Mode C (altitude reporting) are used in air traffic 
control. 

(See INTERROGATOR.) 
(See RADAR.) 
(See TRANSPONDER.) 
(See ICAO term MODE.) 
(Refer to AIM.) 

MODE (SSR MODE) [ICAO]

 The letter or number 

assigned to a specific pulse spacing of the 
interrogation signals transmitted by an interrogator. 
There are 4 modes, A, B, C and D specified in Annex 
10, corresponding to four different interrogation 
pulse spacings. 

MODE C INTRUDER ALERT

 A function of 

certain air traffic control automated systems designed 
to alert radar controllers to existing or pending 
situations between a tracked target (known IFR or 
VFR aircraft) and an untracked target (unknown IFR 
or VFR aircraft) that requires immediate attention/ac-
tion. 

(See CONFLICT ALERT.) 

MODEL AIRCRAFT

 An unmanned aircraft that is: 

(1) capable of sustained flight in the atmosphere; (2) 
flown within visual line of sight of the person 
operating the aircraft; and (3) flown for hobby or 
recreational purposes

MONITOR

 (When used with communication 

transfer) listen on a specific frequency and stand by 
for instructions. Under normal circumstances do not 
establish communications. 

MONITOR ALERT (MA)

 A function of the TFMS 

that provides traffic management personnel with a 
tool for predicting potential capacity problems in 
individual operational sectors. The MA is an 
indication that traffic management personnel need to 
analyze a particular sector for actual activity and to 
determine the required action(s), if any, needed to 
control the demand. 

MONITOR ALERT PARAMETER (MAP)

 The 

number designated for use in monitor alert 
processing by the TFMS. The MAP is designated for 
each operational sector for increments of 15 minutes. 

MOSAIC/MULTI

SENSOR MODE

 Accepts posi-

tional data from multiple radar or ADS

B sites. 

Targets are displayed from a single source within a 
radar sort box according to the hierarchy of the 
sources assigned. 

MOUNTAIN WAVE– Mountain waves occur when 
air is being blown over a mountain range or even the 

PCG M