Max continuous or full throttle OGE hover ceiling vs. gross weight Pressure altitude (PA x feet in thousands) A C 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 900 1,000 1,100 1,200 1,300 1,400 425 450 475 500 525 550 575 600 625 B Density altitude 12,600 feet °C °F −20 −10 0 +10 +20 +30 +40 −4 +14 +32 +50 +68 +86 +104 OAT GROSS WEIGHT (LB) OUT OF GROUND EFFECT Full throttle (or limit manifold pressure) and 104% rpm GROSS WEIGHT (KG) −20°C −10°C 0°C +10°C +20°C +30°C +40°C Standard day IGE hover ceiling vs. gross weight Pressure altitude (PA x feet in thousands) Density altitude 12,600 feet A C 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 900 1,000 1,100 1,200 1,300 1,400 425 450 475 500 525 550 575 600 625 B °C °F −20 −10 0 +10 +20 +30 +40 −4 +14 +32 +50 +68 +86 +104 OAT GROSS WEIGHT (LB) IN GROUND EFFECT AT 2-FOOT SKID CLEARANCE Full throttle and 104% rpm GROSS WEIGHT (KG) −20°C 1,370 −10°C 0°C +10°C +20°C +30°C +40°C Standard day Figure 7-5.  Out of ground effect hover ceiling versus gross weight  chart. Figure 7-4.  In ground effect hovering ceiling versus gross weight  chart. torque amounts for both engines.  Using  Figure 7-6 , determine what torque is required to hover.  Use the following conditions: weight to hover OGE is approximately 1,130 pounds (point  C). Since your gross weight is higher than this value, you will  not be able to hover in these conditions. To accomplish the  mission, you will need to remove approximately 70 pounds  before you begin the flight. These two sample problems emphasize the importance of  determining the gross weight and hover ceiling throughout  the entire flight operation. Being able to hover at the takeoff  location with a specific gross weight does not ensure the  same performance at the landing point. If the destination  point is at a higher density altitude because of higher  elevation, temperature, and/or relative humidity, more power  is required to hover there. You should be able to predict  whether hovering power will be available at the destination  by knowing the temperature and wind conditions, using  the performance charts in the helicopter flight manual, and  making certain power checks during hover and in flight prior  to commencing the approach and landing. First, enter the chart at 9,500 feet pressure altitude, then  move right to outside air temperature, 0 °C. From that point,  move down to 4,250 pounds gross weight and then move left  to 5-foot skid height. Drop down to read 66 percent torque  required to hover. For helicopters with dual engines, performance charts provide  7-6 Climb Performance Sample Hover Problem 3 A.  Pressure Altitude . . . . . . . . . . . . . . . . . . . ..9,500 feet B.  Outside Air Temperature ............... . . . 0 °C C. Gross Weight. . . . . . . . . . . . . . . . . . . . . . . . . 4,250 lb D.  Desired Skid Height . . . . . . . . . . . . . . . . . . . . . . 5 feet