<s>
The	O
Multi-role	B-Device
Electronically	I-Device
Scanned	I-Device
Array	I-Device
(	O
MESA	O
)	O
is	O
an	O
active	B-Architecture
electronically	I-Architecture
scanned	I-Architecture
array	I-Architecture
surveillance	O
radar	O
system	O
for	O
the	O
Boeing	O
737	O
AEW&C	O
airborne	O
early	O
warning	O
and	O
control	O
aircraft	O
.	O
</s>
<s>
The	O
L	B-Algorithm
band	I-Algorithm
(	O
1	O
to	O
2GHz	O
)	O
electronically	O
scanned	O
AEW	O
and	O
surveillance	O
radar	O
is	O
located	O
on	O
a	O
dorsal	O
fin	O
on	O
top	O
of	O
the	O
fuselage	O
,	O
dubbed	O
the	O
"	O
top	O
hat	O
"	O
,	O
and	O
is	O
designed	O
for	O
minimal	O
aerodynamic	O
effect	O
.	O
</s>
