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normal outsize cargo
normal outsize cargo That having cross-section greater
than 9 ft × 10 ft, which is C-130 or C-141 size (DoD).
normal pressure drag C Dp , downwind resultant force
coefficient.
normal propeller state Usual condition for helicopter
under power, with rotor thrust in opposition to flow direction
through disc.
normal rating Maximum continuous (R).
normal shock Shockwave at 90° to fluid flow direction.
normal spin Intentional spin entered from upright attitude
and recoverable by centralizing controls or applying
opposite rudder (US usually adds ‘within two turns’).
normal turn Procedure turn through 360° in two
minutes.
normal velocity “The component velocity along the
normal axis relative to the air”, (B.S., 1940).
Normand theorem On tephigram a dry-adiabatic line
drawn through dry-bulb temperature, saturatedadiabatic
through wet-bulb temperature, and dewpoint
line through dewpoint temperature all meet at point
which represents condensation level.
NORS, Nors Not operationally ready, spare parts (or
supply, as an order).
Norse Nuclear, optical and radar [or radiation] signature
evaluation [or estimation].
Norte Pronounced ‘nortay’, cold, dry north wind over
Gulf of Mexico.
northerly turning error Transient errors in magneticcompass
reading caused by vertical component of
magnetic field, at maximum when turning off northerly or
southerly course. In N hemisphere compass is sluggish
and lags behind when turning to L or R through northerly
heading and races ahead when turning L or R through
southerly. In US usually called magnetic turning error.
north mode Display, eg Automap or moving-map, has N
at top.
nor-wester Line squalls [Bengal Assam].
NOS 1 Night observation sight, or surveillance.
2 National Ocean Service.
3 New old stock [obsolete but never used].
NOSC 1 NATO operations support cell.
2 Network operations and security center (USAF).
nose 1 Foremost part of vehicle, measured relative to
direction of travel, excluding secondary structures or
probes.
2 Leading portion of aerofoil, hence D-*, * rib.
nose art Decorative painting on aircraft forward fuselage
or nose.
nose battens Radial stiffeners around nose of airship.
nose-cap 1 Removable nose, usually body of revolution,
forming forward extremity of larger forebody.
2 Small spinner not extending further aft than front of
blade roots.
3 Bow cap.
nosecone Essentially conical nose of high-speed vehicle,
esp. fairing over re-entry vehicle.
nose-dive Dive at very steep (near-vertical) angle.
nose down 1 To push over from level flight into glide or
dive.
2 To fly with fuselage in ** attitude, though not necessarily
losing height.
nose drive Shaft drive to auxiliaries taken off front of
gas-turbine engine along axis of symmetry, eg ** generator.
notch aerial
nose entry Shape of aircraft nose evaluated from aerodynamic
and aesthetic viewpoints.
nose gear Forward unit of tricycle landing gear, no
matter how far location is from nose.
nose gearbox Gearbox mounted on front (usually on
centreline) of gas-turbine engine to drive auxiliaries, helicopter
shafting or propeller (ie, turboprop); not mounted
remotely on struts.
nose-heavy Tending to rotate nose-down when controls
released.
nose in 1 To taxi and park facing terminal building or
finger.
2 Aircraft thus parked (see Agnis, Safeway, sidemarker).
nose landing gear Nose gear.
nose leg Main leg of nose gear.
nose over To overturn (eg after landing tailwheel-type
aircraft on soft ground) by rotating tail-up to inverted
position.
noseplane Canard foreplane mounted at or ahead of
nose; not applicable to conventional modern canards.
noseplate Metal plate on centreline of hang glider
linking leading-edge tubes.
nose radar Radar whose aerials (antennas) are in nose
of aircraft pointing ahead, esp. for use against targets
ahead of aircraft.
nose radiator Piston-engine radiator immediately
behind propeller or, esp., on front of pusher nacelle.
nose ribs Ribs along leading edge extending chordwise
only as far as front spar.
nose slice Maximum-rate yaw induced by rudder.
nose slots Apertures in low-pressure region of high
velocity around nose for discharge of fluid flow, eg
cooling air.
nose tow Standard US Navy method of catapult link for
accelerated carrier takeoff by pulling on nose leg.
nose up To rotate in pitch from level flight to climb.
nosewheel Wheel(s) of nose gear.
no-show Airline passenger who has booked ticket but
fails to check in for flight.
Nosig No significant meteorological change (ICAO).
NOSS National Ocean Surveillance System (NRO).
NO STEP Stencilled warning on aircraft: do not put
weight on this area.
NOT Naczelna Organizacja Techniczna (Polish federation
of engineering associations).
Notal Not to all.
Notam, NOTAM Notice[s] to Airmen, identified as
notice or as Airmen Advisory, disseminated by all means
to give information on establishment, conditon or change
in any aeronautical facility, service, procedure or hazard;
suffix D distant [wide dissemination], L local (ICAO).
Notam code Standard code for transmitting Notams; eg
QAUED 3 MC 5813 142359 is interpreted as ‘Met com
operating frequency of 3 MHz will be changed to 5,813
kHz on 14th of this month at 23.59’.
Notar No tail rotor, torque reaction supplied by offset
thrust from air blown through slit in tail boom (Hughes,
then McDonnell Douglas, now Boeing).
notch Essentially chordwise or streamwise sawcut or
groove over nose of aerofoil.
notch aerial Formed by cutout in skin of vehicle, leaving
aperture matched to wavelength (usually in HF com.
band) and covered with dielectric skin to original profile.
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