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series burn
3 Mathematical expression with sequence of terms
having form a 1 + a 2 + ...a n .
4 Connected in succession on same line, wire or channel
and thus all carrying same signal, current or flow. Thus a
turbine bearing, rotor disc and OGV may be cooled by a
single airflow in *.
series burn Consecutive burns of single or multiple
rocket motors, eg on Space Shuttle Orbiter.
series loading Addition of inductance in series to
increase electrical length of aerial and reduce natural
frequency of system.
series modulation Connection of modulator in series
with amplifier.
series/parallel redundancy Connection of fluid pipes or
other lines to give particular item (eg control valves of
LMAE) choice of series or parallel redundancy, either on
command or automatic and switched by sensed failure.
series production Manufacture of successive identical
(or near-identical) articles.
series redundancy Connection of two or more similar
items, eg control valves, in series so that failure of one does
not imperil functioning system.
series resonant circuit One in which inductances and
capacitances are connected in series.
series servo Servo located in control sytem so that its
output adds to that of a major input. Commonly used
with SAS actuators to superimpose controls on primary
commands without motion at major input.
series yaw damper One connected into rudder circuit at
PFCU, driving surface only but having no effect upstream
and thus not felt at pedals; may be operative at all times,
including takeoff and landing.
SERL Services Electronics Research Laboratory (UK,
MoD PE, Baldock).
SermeTel Coating systems [notably Process 2000]
comprising aluminium-filled ceramic basecoat [sacrificial]
and inert glossy-ceramic top-coat.
SERN, Sern Single-expansion ramp nozzle.
Serno Serial number.
serpentine inlet Shaped to prevent hostile radars from
‘seeing’ the engine.
Serrate Family of similar passive receivers carried by
night intruders and giving bearing of hostile night-fighter
radars (RAF, WW2).
serrated skin joint Having a sawtooth edge to minimize
radar cross-section.
SERT Space electric (or electrostatic) rocket test.
SERV Safety enhanced re-entry vehicle.
Service See service (2).
service 1 Use, employment for design function; thus
squadron *, line * (civil airline) etc.
2 Major branch of national armed forces.
3 To carry out routine maintenance and replenishment.
4 Facility offered to aviators, eg radar *, ATC *.
service area 1 Geographical extent of coverage of radio
navaid or other surface-based electronic system.
2 Part of airfield assigned to routine servicing.
3 Part of airfield dedicated to support services, eg
crash/fire/rescue, transport vehicles, trolley and stairway
parking, etc.
Service Bulletin Advisory notice issued by manufacturer
of aircraft, engine or equipment alerting operators to
actual or predicted faults which require rectification,
remedial maintenance or design modification. Some are
servo-assisted altimeter
prefaced mandatory, but, unlike ADs, SBs cannot be
legally enforced.
service ceiling Basic performance parameter for (usually
military) aircraft; height which maximum rate of climb
has fallen to lowest value practical for military operations,
in UK and US traditionally equal to 100 ft/min.
Service Deviation Temporary permitted deviation from
MAR to meet urgent OR covering a modification which
should eventually be subject to MAR procedures. Aircraft
airworthiness under SD is responsibility of the user
Service (UK forces).
service door Door in aircraft outer skin covering a maintenance
or control panel, eg for cargo loading.
service engineering Function of determining integrity of
materiel and services to measure and maintain operational
reliability, approve design changes and assure
conformance with approved specifications and standards
(USAF).
service load “The total weight of crew, removable armaments
and equipment normally carried” (UK usage,
1920–40).
service loads Structural loads actually met in service.
Serviceman Member of the armed forces (UK origin);
need for Servicewoman is suggested.
service module Major element of spacecraft supplying
secondary power and consumables.
service stand Place assigned to a particular flight (7); can
be gate position or marshalled location on distant apron.
Some servicing is normally performed here before departure.
service tank Fuel tank located near engine to which fuel
from other tanks is pumped and from which fuel is
supplied to engine (arch.).
Service Technique See STAé.
service test Test of hardware or technique under simulated
or actual operational conditions to confirm
satisfaction of military requirements.
service-test model Model (full-scale item is implied) used
to determine characteristics, capabilities and limitations
under simulated or actual service operational conditions
(ASCC).
service tower Tower used to afford access to whole
length of tall (eg ballistic or Shuttle) vehicle before liftoff;
generally synonymous with gantry.
service transport unit Installation conveying electric and
hydraulic (in some cases pneumatic) power and a wide
range of liquids across apron-drive bridges to aircraft.
servicing To carry out service (3).
servicing appraisal exercise Formal study of servicing of
particular hardware item (eg combat aircraft) in simulated
combat conditions, to yield job times, difficulties,
conflicts and shortcomings and make recommendations
(UK usage).
servicing instruction Issued to remedy or prevent defect
in military hardware item when action required may be
urgent and recurrent (UK usage). May be issued when
defect is suspected but not confirmed; roughly equivalent
to Airworthiness Directive.
serving cord Usually seven-strand machine cord, used
for wrapping control-cable splices.
servo Servomechanism, but now word in own right.
servoactuator The actuator in a servomechanism.
servo-assisted altimeter Pressure altimeter in which
capsule movement is measured by sensitive EM pick-off
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