(b)
leaves the aerodrome traffic circuit but will be returning to land.

Fr: aéronef itinérant
IWP Abbreviation for: intermediate approach waypoint Fr: IWP
J

J
(1) The letter used on aeronautical charts to indicate a high level airway (e.g. J500).
Fr: J
(2) U.S.: Abbreviation for: jet route
. see: high level airway
James Brake Index An index that is used at Canadian military aerodromes to report the runway coefficient of friction. It is determined via a vehicle-mounted decelerometer with a scale that is graduated in increments from 0 to 1. Small numbers represent low braking coefficients of friction while numbers on the order of 0.8 and above indicate the braking coefficients to be expected on bare and dry runways. JBI charts may be found in the Military Flight Data and Procedures section of the Canada Flight Supplement (CFS).
.
abbreviation: JBI

.
see also: Canadian Runway Friction Index (CRFI)

Fr: indice de décélération James
jamming Electronic or mechanical interference that may disrupt the display of aircraft on radar or the transmission or reception of radio communication or radio navigation signals. Fr: brouillage
JBI Abbreviation for: James Brake Index Fr: JBI
jet blast
Jet-engine exhaust.
Fr: souffle de réacteur
jet route U.S.: Expression for: high level airway
. abbreviation: J
jet stream Flat tubular, quasi-horizontal, current of air generally near the tropopause, whose axis is along a line of maximum speed and which is characterized by great speeds and strong vertical and horizontal wind shears (WS). Fr: courant-jet
jettisoning of external stores
The airborne release of external stores, e.g. tip tanks, ordnance.
. see also: fuel dumping
Fr: largage d’équipement externe
joint use restricted area U.S.: Expression for: restricted area
K

known aircraft
An aircraft of whose movements ATS has been informed.
. also called: known traffic
Fr: aéronef connu
known traffic Other expression for: known aircraft
L

LAAS
(1) U.S. and Canada: Abbreviation for: local area augmentation system