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MABES
MABES Manufacturing agent-based emulation
system.
MAC 1 Mean aeroydynamic chord, = c .
2 Military Airlift Command (USAF).
3 Maintenance Analysis Center (FAA).
4 Maintenance allocation chart.
5 Master air control (UK, CAA).
6 Medium-access controller.
7 Multi-activity contract.
8 Air defence command (Spain).
9 Message act cancelled, or cancellation.
10 Multiple all-up round canister, converts SSBN to
fire cruise missiles.
11 Mid-air collision.
12 Mediterranean Air Command (US/UK, WW2).
13 Metal augmented charge (warhead).
14 Media access control [protocol].
Mac Pitching moment of aircraft about aerodynamic
centre.
MACA Military assistance to civil authorities (US).
Macas Mid-air collision-avoidance system.
MACC 1 Military area control centre.
2 Multi-application control computer.
3 Modified Air Control Center.
4 Modular air command and control.
MACCS Marine air command and control system
(DoD).
Mace, MACE 1 Minimum-area crutchless ejector.
2 Multinational alliance for criminal emergencies.
3 Multiple adaptive combat environment [for BVR
training].
4 Multistatic ASW capability enhancement.
MACF Missed-approach control failure.
Mach Mach number.
Mach angle Angle between weak (ie point-source)
shockwave and freestream flow; theoretically 90° at
Mach 1, thereafter α = sin –1 ––
1
M .
Mach-buster Anyone who has flown faster than sound,
esp. in pre-Concorde era when accomplishment had
element of exclusivity.
Mach cone Conical shock front from point source
moving at supersonic speed relative to surrounding fluid;
locus of Mach lines. Semi-vertex angle θ is given by cosec
θ = M, where M is free-stream Mach number.
Mach disc Visible disc at point of minimum diameter
between jet shock and tail shock in supersonic jet, ie
between adjacent shock diamonds.
Mach front Mach stem.
Mach hold Autopilot of AFCS mode holding Mach
number at preset value.
machine Flying machine, normally aeroplane (colloq.,
arch.).
machine gun Magazine-fed automatic weapon using
rifle ammunition.
machine language Normally compatible with particular
computer but unintelligible to humans.
machine screw For pre-threaded holes and/or nuts,
loosely = bolt.
machine to machine Basis of future tactical air operations
for netcentric warfare, supported by MAAP
[machine means those that provide information and take
decisions] (USAF).
machining centre Major group of (usually NC) machine
tools performing large number of operations on work-
MACS
piece held either stationary or under positive control
throughout.
Mach intersection Junction of two or more shockwaves.
Mach-limited Boundaries of flight performance set by
restriction on permissible Mach number, not by thrust or
other limitation, esp. * ceiling.
Mach line 1 Weak (infinitesimal amplitude) shockwave.
2 Line on surface of body (ignoring boundary layer) at
which accelerating free-stream flow reaches relative
Mach 1.
3 Some authorities are confusingly using this term to
mean weak shockwaves in supersonic flight.
Mach lock See Mach hold.
Machmeter Instrument giving near-instantaneous
readout of Mach number.
Mach NO/YES Air-intercept code: ‘I have reached
maximum speed and am not/am closing on target’.
Mach number Ratio of true airspeed to speed of sound
in surrounding fluid (which varies as square root of
absolute temperature). Synbol M=V/a.
Mach-number factor 1–M 2 ; in supersonic flight M 2 –1.
Mach reflection Attenuated shockwave reflected from
solid surface, eg walls of tunnel or Earth’s surface.
Reflection and some other effects approximate laws of
optics.
Mach stem Shock front (Mach front) formed by fusion
of incident and ground-reflected blast waves from explosion,
esp. from NW.
Mach trim coupler Electronic subsystem of Mach trim
system, which through analog (to 1970) or digital computational
chain controls aircraft pitch-trim servo as
function of Mach number; also contains switching, logic,
monitoring and Bite.
Mach trimmer Electronic/mechanical system for
relieving pilot of task of correcting progressive deficiency
in aircraft pitch trim and longitudinal stability at high
Mach numbers; sensitive to Mach number and vertical
acceleration and automatically feeds primary pitch-trim
demand to keep aircraft level or in desired attitude while
leaving pilot authority to feed manual trim. In US called
pitch trim compensator.
Mach tuck Uncommanded, and possibly violent, nosedown
pitching moment at high [usually just subsonic]
Mach numbers.
MAC I Model Aeronautics Council of Ireland.
MACIMS Military Airlift Command integrated
management system.
Mack Future AFSOC multirole proposal: MX Combat
Talon replacement, AX gunship, CX airlifter, KX tanker
(USAF).
mackerel sky Large area of high cloud giving dappled or
banded effect (alto-cu or cirro-cu).
Maclaurin series Special case of Taylor series where f(x)
and all derivatives remain finite at x=0.
Macman McDonnell anthropometric computerized
man.
Macom, MACOM Air-combat command (Spanish air
force, EdeA).
MACR Missing Air Crew Report[s] (USAAF, USAF).
Macro Block of software capable of repeated use.
macro level Preliminary design of software.
macroscopic Generally, large enough to be visible to
naked eye.
MACS 1 Marine air control squadron (DoD).
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