5-11 OBSTACLE TAKEOFF DISTANCE
(Refer to the tables on the following pages)
Conditions:
Winds
....................................................................................................Zero
Runway
..............................................................Paved, Level, Dry Runway
Flaps
........................................................................................................20°
Power
......................................................Maximum Torque (per Figure 5-2)
Propeller
...................................................................................... 2200 RPM
Inertial Air Particle Separator.............................................................Normal
NOTES:
• Obstacle takeoff technique utilized as outlined in “Section 4.”
• Rotation initiated at stall speed.
• Decrease distances 10% for each 12 knots headwind. For operation in
tailwinds up to 10 knots, increase distances by 10% for each 2 knots.
• For operation on a hard dry grass runway, increase distances by 20%
of the “ground roll” calculation.
• With takeoff power set below the torque limit, increase both ground roll
and total distances by 1%, for the inertial separator system in bypass.
• For operation in air colder than this table provides, use the coldest
data for takeoff distances.
• For operation in air warmer than this table provides, use extreme
caution.
• Dashed entries indicate atmospheric temperatures beyond the aircraft
operating limits.
• For each 1% of upsloped runway (up to 3% grade), increase the table
distances by:
22% of the ground roll distance at Sea Level to 4,999 feet
30% of the ground roll distance at 5,000 to 9,999 feet
43% of the ground roll distance at 10,000 feet or above
• For each 1% of downsloped runway, decrease the table distances by:
7% of the ground roll distance at Sea Level to 4,999 feet
10% of the ground roll distance at 5,000 feet to 9,999 feet
14 % of the ground roll distance at 10,000 feet or above
• When Air Conditioning is ON, and takeoff power is set below the
torque limit, increase ground roll by 6.1% and total distance by 6.7%.
NOTE: Red shaded areas represent data at temperatures greater than
the maximum approved operating OAT, but may be used for the purpose of
interpolating.
Example:
Outside Air Temperature ..............20°C
Weight
............................ 7255 pounds
Field Pressure Altitude
................2000
Headwind Component
........... 12 knots
Runway
.....Paved, Level, Dry Runway
Propeller
............................. 2200 RPM
Results:
Rotation Speed.....................60 KIAS
50 Foot Obstacle Speed.......73 KIAS
Takeoff Ground Roll
............1022 feet
Total Distance Over
50 Foot Obstacle
................ 1572 feet
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