Mental Math for Pilots - Weebly



Mental Math for Pilots

| Radials/NM |Drift Correction |

|60 ( DME = Radials / NM |Crosswind ( IMN = ( of Correction |

|(i.e. 20 DME Arc = 3 Radials/nm) |(i.e. 15kts ( .8 IMN ( 2( Correction) |

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|90( Turn Radius |Mach Calculation |

|10% of KCAS (Low Altitude) |KCAS ( 60 = NM/Min = IMN |

|IMN – 2 (High Altitude) |(i.e. 300 KCAS = 5 NM/Min = .5 IMN) |

|(i.e. 300 KCAS = 3nm Turn Radius at Low Altitude) | |

|(i.e. .8 IMN = 6nm Turn Radius at High Altitude) | |

| |VVI Calculation |

| |Use Groundspeed Instead of IMN for Wind Correction |

|Arc to Radial Lead Point |IMN * Pitch = VVI |

|Radials/NM x Turn Radius |(i.e. 180kts = .4 IMN * 2( Nose Low = 1,000fpm) |

|(i.e. 20 DME Arc = 3 Radials/NM * 6nm Turn Radius = 18( Radial Lead Point) | |

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| |Procedure Turns |

|Lead Point Fractions |Travel Outbound How Far to Remain Within Specified Distance: |

|60( Turn = ½ |80/260 45/180 |

|45( Turn = 1/3 |3 * Turn Radius (3 * Turn Radius) + 2 |

|30( Turn = 1/6 |(i.e. Turn Radius = 4nm, Travel 12nm Outbound Before Beginning 80/260) |

|(i.e. 6nm 90( Turn Radius = 1nm 30( Turn Radius) | |

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| |Holding Turn |

|Descent Gradient |Displacement From Inbound Course |

|Altitude to Lose ( Distance = % of 10( |Turn Radius * Radials/NM * 2 |

|(i.e. 8,000ft ( 32nm = 1/4 ( 2.5( Nose Low) |(i.e. 2.5nm Turn Radius at 30 DME = 10( Radial Displacement) |

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|Crosswind Component (Clock Method) |Hydroplaning Speed |

|15( Off = ¼ Past |Speed = 9 * (Tire Pressure |

|30( Off = ½ Past | |

|45( Off = ¾ Past | |

|(i.e. 310( Heading, Winds 265/20, Crosswind = ¾ * 20 = 15kts) | |

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