What are your Dry/Wet margins?

[Rhinozherous 90]

Hey!

When do you guys use the water injection? Above an certain Temperature, or only on short runways, or high alt airport?

Thanks 

[Olympic260 415]

Personally high temps with short runways, or high temps with heavy loads

[downscc 1,327]

7 hours ago, Rhinozherous said:

Hey!

When do you guys use the water injection? Above an certain Temperature, or only on short runways, or high alt airport?

Thanks 

Use the POH.  Charts for dry and wet takeoff on pgs 288-289.  Judgement is important but eliminate guesswork. Wet takeoff is called for anytime GTOW is over 92,000 lbs and when lighter but facing a short runway at high altitude.  Note there is no temperature compensation on these charts because they are for standard atmospheric conditions therefore I interpret the altitude scale as density altitude to compensate.