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Pilot/Controller Glossary 

12/2/21 

transfer of an aircraft under instrument flight 
conditions from the beginning of the initial approach 
to a landing or to a point from which a landing may 
be made visually. It is prescribed and approved for a 
specific airport by competent authority. 

(See SEGMENTS OF AN INSTRUMENT 

APPROACH PROCEDURE.) 

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

a. 

U.S. civil standard instrument approach 

procedures are approved by the FAA as prescribed 
under 14 CFR Part 97 and are available for public 
use. 

b. 

U.S. military standard instrument approach 

procedures are approved and published by the 
Department of Defense. 

c. 

Special instrument approach procedures are 

approved by the FAA for individual operators but are 
not published in 14 CFR Part 97 for public use. 

(See ICAO term INSTRUMENT APPROACH 

PROCEDURE.) 

INSTRUMENT APPROACH PROCEDURE 
[ICAO]

 A series of predetermined maneuvers by 

reference to flight instruments with specified 
protection from obstacles from the initial approach 
fix, or where applicable, from the beginning of a 
defined arrival route to a point from which a landing 
can be completed and thereafter, if a landing is not 
completed, to a position at which holding or en route 
obstacle clearance criteria apply. 

(See ICAO term INSTRUMENT APPROACH 

OPERATIONS) 

INSTRUMENT APPROACH PROCEDURE 
CHARTS

 

(See AERONAUTICAL CHART.) 

INSTRUMENT DEPARTURE PROCEDURE 
(DP)

 A preplanned instrument flight rule (IFR) 

departure procedure published for pilot use, in 
graphic or textual format, that provides obstruction 
clearance from the terminal area to the appropriate en 
route structure. There are two types of DP, Obstacle 
Departure Procedure (ODP), printed either textually 
or graphically, and, Standard Instrument Departure 
(SID), which is always printed graphically. 

(See IFR TAKEOFF MINIMUMS AND 

DEPARTURE PROCEDURES.) 

(See OBSTACLE DEPARTURE PROCEDURES.) 
(See STANDARD INSTRUMENT DEPARTURES.) 
(Refer to AIM.) 

INSTRUMENT DEPARTURE PROCEDURE (DP) 
CHARTS

 

(See AERONAUTICAL CHART.) 

INSTRUMENT FLIGHT RULES (IFR)

 Rules 

governing the procedures for conducting instrument 
flight. Also a term used by pilots and controllers to 
indicate type of flight plan. 

(See INSTRUMENT METEOROLOGICAL 

CONDITIONS.) 

(See VISUAL FLIGHT RULES.) 
(See VISUAL METEOROLOGICAL 

CONDITIONS.) 

(See ICAO term INSTRUMENT FLIGHT 

RULES.) 

(Refer to AIM.) 

INSTRUMENT FLIGHT RULES [ICAO]

 A set of 

rules governing the conduct of flight under 
instrument meteorological conditions. 

INSTRUMENT LANDING SYSTEM (ILS)

 A 

precision instrument approach system which normal­
ly consists of the following electronic components 
and visual aids: 

a. 

Localizer. 

(See LOCALIZER.) 

b. 

Glideslope. 

(See GLIDESLOPE.) 

c. 

Outer Marker. 

(See OUTER MARKER.) 

d. 

Middle Marker. 

(See MIDDLE MARKER.) 

e. 

Approach Lights. 

(See AIRPORT LIGHTING.) 
(Refer to 14 CFR Part 91.) 
(Refer to AIM.) 

INSTRUMENT METEOROLOGICAL CONDI­
TIONS (IMC)

 Meteorological conditions expressed 

in terms of visibility, distance from cloud, and ceiling 
less than the minima specified for visual meteorolog­
ical conditions. 

(See INSTRUMENT FLIGHT RULES.) 
(See VISUAL FLIGHT RULES.) 
(See VISUAL METEOROLOGICAL 

CONDITIONS.) 

INSTRUMENT RUNWAY

 A runway equipped 

with electronic and visual navigation aids for which 
a precision or nonprecision approach procedure 
having straight­in landing minimums has been 
approved. 

(See ICAO term INSTRUMENT RUNWAY.) 

PCG I