1Mission
Requirements:
(often
dictated by
the customer)
1.1
Performance
specifications
1.2.1
Payload-range
1.2.2
Loiter and/or
endurance
1.2.3
Speed and
altitude
1.2.4
Field length for
takeoff and
landing
1.2.5
Climb rate/or
gradient,
time-to-climb
1.2.6
Acceleration
and/or
deceleration
1.2.7
Manufacturing:
instantaneous
and/or
sustained,
specific excess
power, agility
1.2 Operational specifications
1.2.1
Payload type and
payload
arrangement
1.2.2
Survivability
(ejection,
armor)
1.2.3
Surface from
which to
operate: water,
ice, snow soft
field
1.2.4
High angle of
attack
capability
2.
Airworthiness
Requirements:
(Regulations
set by the
government)
2.1 Performance regulations
2.1.1
Minimum speed
(s)
and reference
speed
(s)
2.1.2
Minimum climb
rate/or
gradient, AEO
and OEI
2.1.3
Field
length for
takeoff and
landing
2.2 Stability and control
regulations
2.1.1
Minimum
stability and
controllability
(with and
without failures
of engines
and/or
flight-crucial
systems)
2.1.2
Minimum
maneuverability
2.1.3
Stall-spin
behavior
2.3 Structural regulations
2.3.1
Minimum design
load factor
2.3.2
Fatigue life
(gust spectra)
2.3.3
Fail safe
2.3.4
Crash
survivability
2.3.5
Flutter and
steady state
aeroelastiity
2.4 Other regulations
Examples of 'other' important
regulations are:
2.4.1
Escape and
emergency exit
regulations
2.4.2
System
regulations:
Fuel
system
Electrical
system
Hydraulic system
Etcetera
3.Environmental
Requirements :
(Set by the
government)
3.1
Airport and
community noise
3.2
Internal noise
(crew and
passengers)
3.3
Emissions
(particulates,
ozone
destruction)
4.Test
Requirements:
(Often
dictated by
the costumer)
4.1 Minimum design and
development cost
4.2 Minimum manufacturing cost
4.3 Minimum operating cost
4.4 Minimum life-cycle cost
4.5 Maximum return-on-investments
4.6 Design to new-worth
Note: There is much
statistical
evidence which
links cost
directly to
weight, to
system
complexity, to
parts count and
lack of
accessibility!
5.Manufacturing
Requirements:
(Set by the
manufacturer
and/or the
costumer)
5.1 Design to existing
manufacturing
capability
5.2 Design to future
manufacturing
capability
5.3 Design to existing or new
materials
5.4 Design to minimize parts
count and/or
minimum
through-put time
in assembly
6. Maintenance
and
accessibility
Requirements:
(Set by the
customer
and/or the
manufacturer)
6.1 Engine access and removal
requirements
6.2 Equipment access and
removal
requirements
6.3 Inspectability for crack
in primary
structure
AEO = ALL Engine operating
OEI = One Engine Inoperative
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