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mobile satellite system
helicopter-capable ship, for receiving special cargo, eg
lunar rock.
mobile satellite system One designed to serve mobile (eg
aeronautical) subscribers.
MOBSS Mobility support squadron.
MOC 1 Maintenance operational check.
2 Minimum operational characteristics.
3 Minimum obstacle clearance.
4 Mars orbiter [or orbital] camera.
5 Modular [or mission, or multifunction] operations
centre [or console].
MOCA Minimum obstruction- [or obstacle-] clearance
altitude.
mock-up Quickly built replica of aircraft or other
product, usually full-scale, to solve various problems (see
customer *, engineering *, exhibition *, furnishing *, hard
*).
MOCM Multispectral ocean colour monitor.
MOCN NC machine tool (F).
MOCVD Metal organic chemical vapour deposition.
MOD 1 Magneto-optical drive.
2 Meteoroids and orbital debris.
MoD Ministry of Defence [London SW1A 2HB] (UK).
mod 1 Modification, or modified.
2 Modulation, or modulator.
3 Moderate.
Modar Modular aviation radar.
Modas 1 Modular data-acquisition system.
2 Modular defensive-aids suite (UK, RAF).
MOD-DIG, Mod-Dig Modular digital imagegenerator.
mode 1 The five classical * of aeroplane motion; see
motion.
2 Any of selectable methods of operation of device or
system.
3 Number or letter referring to specific pulse spacing
of signal transmitted by interrogator (IFF, SIR, SSR).
4 Each possible configuration of spatial variable, eg
EM wave, flutter or aerodynamic phenomena.
Mode A Pulse format for interrogation of ATCRBS,
displaying aircraft identity, range and bearing on SSR.
Mode B Optional for ATCRBS transponder.
Mode C Pulse format which also adds aircraft altitude.
Modec Automatic reporting of altitude.
mode-coupled oscillation PIOs, assumed linear, which
interact with flexible modes of structure [in complex and
usually unique ways].
Mode D Optional or unassigned transponder mode.
model Ambiguously used in aviation:
1 Small-scale replica for testing characteristics of fullsize
aircraft.
2 In general aviation, improved version marketed at
(often annual) intervals.
3 To reproduce a functioning system synthetically, eg in
EDP program.
model atmosphere Mathematically exact numerical
values closely approximating to an idealized real atmosphere.
model basin See towing tank.
model cart Often large and elaborate wheeled truck on
which are mounted a balance or sting and aircraft model,
the whole then installed in tunnel working section with
large number of electrical and manometric connections.
modulated augmentation
model qualification test US military clearance of new
item, esp. engine, for production.
model tank 1 See towing tank.
2 Tank filled with fluid for flow exploration round
model by electrical potential analogy.
model tunnel Ambiguous, term best reserved for any
small-scale model of a future large wind tunnel.
modem Telecommunications or EDP (1) device: modulator
+ demodulator.
moderator In nuclear reactor, substance specifically
present to slow down neutrons by collisions with nuclei.
Mode S Selective interrogation of SSR offering Mode C
plus mode-select for discrete interrogation and data-link
between nearby aircraft and ATC.
modex Three-numeral designator for quick identification
of individual aircraft within CAG or other unit
(USN).
modification Temporary or permanent change to either
single aircraft (for particular purpose) or all aircraft of
type (to rectify fault or shortcoming or offer improved
capability); can be unique, to owner’s requirement, or one
of planned and controlled series throughout life of
aircraft.
modified close control Interceptor is told only targetposition
information (USAF).
modified mission MDS(4) letter added to left of basic
mission letter to indicate a permanent alteration to basic
mission (DoD).
modified PAR Precision approach guidance for highperformance
aircraft to flare point instead of to
touchdown point (USAF).
Modils Modular ILS.
Modir Modulated IR jammer.
Modis Moderate-resolution imaging spectroradiometer,
or spectrometer.
Modmor Commercially produced (Morgan Crucible)
family of carbon/graphite fibres.
Modos Mobile Doppler Sodar.
MoD(PE) MoD Procurement Executive (UK).
modular Designed in discrete series of major components
for ease of inspection, overhaul or repair by
module replacement without greatly disturbing neighbours;
engine may comprise fan, LP compressor, HP
compressor, combustor, turbine and accessories modules,
while major avionic system may be series of * boxes [see
next].
Modular Concept Unit Standardised sizes for boxes
[e.g., for avionics], developed in conjunction with Arinc
600 to replace ATR sizes. An MCU has a height of 7.64
in (194 mm) and depth of 12.76 in (324 mm). The width is
equal to 1.3N–0.032in, where N is the MCU size number;
thus an 8 MCU box has a width of 10.368 in.
modular insertion stage A low-cost expendable upper
stage to the MSP that would be used to deploy mission
payloads for rapid replenishment and other critical-time
missions (USAF).
modular licence One obtained by studying and passing
successive stages or chapters, common in obtaining CPL.
modular lounge Airport lounge built as unit capable of
(1) being moved from place to place to add capacity
where required or (2) being driven to/from aircraft
(mobile lounge).
modulated augmentation Afterburner (reheat) with fuel
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