1Dk4eXg

eingestion stall
reingestion stall Gas-turbine compressor stall induced
by reingestion of hot gas during reverse-thrust mode.
Reins Radar-equipped inertial navigation system
(Autonetics 1956).
Rejac Receiver/jammer capability.
reject To dump heat out of system into supposed sink,
eg atmosphere.
rejected take-off One aborted after it has begun, ie
between brakes-release and decision point.
rejector Inductance/capacitance in parallel to reject one
resonant frequency.
Rejex Soil-barrier protection for painted surfaces.
rejoining aircraft One returned to service after [for whatever
reason] having been parked for long period.
REK Radio-equipped keypad.
REL 1 Relative direction.
2 Runway edge light[s], lighting.
rel Relative.
relateral tell Relay of air-defence information between
facilities via third; appropriate between automated
centres in degraded communications environment.
relative altitude See vertical separation.
relative bearing Normally means bearing of surface
feature or other aircraft relative to current heading.
relative-bearing indicator, RBI Shows bearing of tuned
fixed station related to aircraft longitudinal axis; unlike
RMI, does not show heading.
relative density 1 Density at height in atmosphere
related to that at S/L, ρ/ρ o , symbol σ.
2 Specific gravity.
relative efficiency of biplane Ratio of wing loadings of
upper and lower wings.
relative humidity Water content of unit volume of
atmosphere expressed as percentage of saturation water
content at same temperature.
relative inclinometer Flight instrument indicating attitude
with respect to apparent gravity (resultant of gravity
and applied acceleration).
relative permittivity See permittivity.
relative scatter intensity Ratio of radiant intensity scattered
in given direction to that in direction of incident
beam; symbol F(ø), relative scattering function.
relative target altitude Vertical difference between altitudes
of interceptor and target.
relative wind Velocity of free-stream air measured with
respect to body in flight, in case of aircraft normally same
as true airspeed but seldom exactly aligned with longitudinal
axis.
relaxation time 1 Elapsed time between removal of
disturbance and restoration of equilibrium conditions
among molecules of fluid (eg air), operative parts of
system or other dynamic components of system.
2 Time for exponentially decaying quantity to decrease
in amplitude by 1/e = 0.36788.
relaxed static stability CCV-derived manoeuvre
enhancement for air-combat fighter, involving rear c.g.,
longer nose, smaller fin etc, with artificial stability
imparted by AFCS.
relay Device in which small control signal, usually electrical,
is made not only to operate at a distance but also to
control large and possibly high-power devices; most serve
switching functions or to protect devices against supply
faults.
relay time Elapsed time between instant message is
remanufactured
completely received and that when it is completely transmitted.
release Clearance of aircraft for line service, eg after
original development or overhaul.
release altitude Altitude of aircraft AGL at actual time
of release of ordnance, tow target etc (DoD).
release blade That selected in FBO test.
released 1 Of aircraft to unit, clearance for inventory
service.
2 Of drawing, approval for transmission to manufacturing
or production department.
3 Of air-defence unit, crews and/or weapons no longer
needed at readiness; when * they will be informed when
state of readiness will be resumed (NESN).
released, available Ready at 20 min. notice (FAA).
release point Point on ground directly above which first
paratroop or cargo item is air-dropped (NATO).
release time Departure time issued by ATC to avoid
conflicts.
reliability Probability that hardware will operate
without failure for specified time; in practice also a result
of operations already accomplished (see despatch *,
MTBF).
reliability coefficient Percentage probability that
aircraft can fly route on particular day with x% load factor
and y% likelihood of diversion. Note: not a measure of
hardware reliability.
relief hole Drilled in metal sheet to allow intersecting
bends to be made to that point without buckling.
relief on station Two UAVs simultaneously worked by
same ground control station.
relief tube Personal urinal pipe normally discharging
overboard.
relief valve Fluid system valve which releases pressure at
preset value.
relight 1 To restart combustion in gas turbine after midair
flameout.
2 To use ridge lift to prolong glide of sailplane.
relight envelope Published diagram of permissible limits
of TAS and height outside which engine relight should be
attempted only in emergency. ** forms part of flight
manual of civil gas turbine aircraft, and for military
aircraft is given for main combustion and afterburner.
relighting altitude That up to which safe and reliable
restarting of power unit (gas turbine is implied) is possible
(CAA).
reluctance Opposition to magnetic flux, property of
magnetic circuit akin to resistance in electric circuit which
limits value of flux for given MMF; symbol R or S, numerically
= l/μ A where 1 is length of magnetic path, μ is
permeability and A cross-sectional area.
Relvel Relative velocity.
REM 1 Rocket engine module.
2 Remaining.
rem Quantity of ionizing radiation which, when
absorbed by body, produces same physiological effect as
1 roentgen of X-ray or gamma radiation; from roentgenequivalent
man.
remanence Flux density remaining (residual) in material
after removal of magnetizing force. Also called
retentivity.
remanufactured Aircraft completely stripped and
inspected, usually by original builder, and with new structure
added where necessary before reassembly and
557