12.100.16(h) . power available; 

12.100.16(g) . use/misuse of flaps; 

12.100.16(f) . headwind/tailwind component; 

A Headwind decreases TODR since it takes less time and therefore distance to reach flying speed
LDR is decreased

A Tailwind increases TODR as a onger time and ground distance are required to reach flying speed
LDR increases

12.100.16(e) . runway surface condition; 

Anything that increases the drag between the wheels and the runway surface will increase TODR
A slippery or wet runway will reduce braking action so the LDR increases

12.100.16(d) . runway slope; 

Upsloping runway
More distance required due to more difficult acceleration
More power required
LDR decreases

Downsloping runway
TODR is decreased – acceleration is etter and less power required
LDR increases

12.100.16(c) . humidity; 

In high humidity takeoff performance is poor and TODR is longer
– reduced air density
High humidity also means longer LDR

12.100.16(b) . temperature and pressure (i.e. density altitude); 

Low air density results in a greater TODR becuase of poorer performance of the engine and airframe
The hotter the temperature the longer the LDR
The lower the pressure the longer the LDR

12.100.16(a) . aircraft weight; 

The heavier the weight the longer the TODR and LDR

12.100.16. Explain the effect of the following factors on TODR (Take Off DistanceRequired) and LDR (Landing Distance Required): 

12.100.14(b) . density altitude. 

Density altitude = pressure altitude plus or minus 120 ft for each 1 degree C deviation from ISA