<s>
Flex	B-Device
temp	I-Device
is	O
a	O
technique	O
used	O
to	O
produce	O
cost	O
savings	O
through	O
increased	O
engine	O
life	O
and	O
reduced	O
overhaul	O
and	O
fuel	O
costs	O
for	O
airliners	O
by	O
allowing	O
them	O
to	O
take-off	O
at	O
less	O
than	O
rated	O
thrust	O
.	O
</s>
<s>
For	O
Airbus	O
and	O
Fokker	O
aircraft	O
the	O
technique	O
is	O
known	O
as	O
flex	B-Device
temp	I-Device
or	O
just	O
flex	O
.	O
</s>
<s>
Other	O
manufacturers	O
use	O
the	O
terms	O
Assumed	B-Device
temperature	I-Device
thrust	I-Device
reduction	I-Device
,	O
Reduced	B-Device
take-off	I-Device
thrust	I-Device
or	O
Factored	B-Device
take-off	I-Device
thrust	I-Device
.	O
</s>
<s>
The	O
flex	B-Device
temp	I-Device
procedure	O
recognizes	O
that	O
an	O
ambient	O
temperature	O
beyond	O
the	O
flat	O
rating	O
produces	O
less	O
thrust	O
.	O
</s>
<s>
This	O
false	O
ambient	O
temperature	O
is	O
the	O
flex	B-Device
temp	I-Device
.	O
</s>
<s>
The	O
flex	B-Device
temp	I-Device
is	O
entered	O
into	O
the	O
flight	O
management	O
system	O
(	O
FMS	O
)	O
—	O
effectively	O
telling	O
the	O
computer	O
to	O
assume	O
the	O
specified	O
air	O
temperature	O
instead	O
of	O
the	O
actual	O
temperature	O
.	O
</s>
<s>
A	O
number	O
of	O
aircraft	O
incidents	O
and	O
accidents	O
have	O
occurred	O
when	O
the	O
flex	B-Device
temp	I-Device
was	O
incorrectly	O
calculated	O
or	O
entered	O
—	O
for	O
example	O
,	O
those	O
involving	O
Emirates	O
Flight	O
407	O
,	O
US	O
Airways	O
flight	O
1702	O
and	O
Thomas	O
Cook	O
Airlines	O
G-OJMC	O
.	O
</s>
