ILS Descent Rates

Steve Sconfienza, Ph.D.

Airline Transport Pilot

Flight Instructor: Airplane Single and Multiengine; Instrument Airplane

cell: 518.366.3957

e-mail: docsteve@localnet.com

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Key Angles

Most glideslopes that are components of an ILS in the United States are the standard three degrees. However, there are exceptions, and VASI glideslopes may differ as well, even when colocated with a three-degree ILS. For any given glide slope angle, multiply the groundspeed by the conversion factor to determine descent rate.

Descent Rate Conversions for Key Angles
Glideslope Angle Descent Rate Conversion
2.50 4.42
3.00 5.31
3.10 5.48
3.50 6.19
3.60 6.37
4.00 7.08
4.20 7.44
4.50 7.97
5.00 8.86
5.50 9.75
5.70 10.11
6.00 10.62
6.40 11.36
6.50 11.54

All Angles, 2.0 through 7.0 degrees

With detail for angles 2.00 through 4.00 degrees

For any given glide slope angle, multiply groundspeed by conversion to determine descent rate

All Angles: 2.0 to 7.0
[3.0 deg.] [4.0 deg.] [5.0 deg.] [6.0 deg.] [7.0 deg.] [2.00 to 4.00 detail]
Glideslope Angle Descent Rate Conversion
2.0 3.54
2.1 3.71
2.2 3.89
2.3 4.07
2.4 4.24
2.5 4.42
2.6 4.60
2.7 4.78
2.8 4.95
2.9 5.13
3.0 5.31
3.1 5.48
3.2 5.66
3.3 5.84
3.4 6.02
3.5 6.19
3.6 6.37
3.7 6.55
3.8 6.73
3.9 6.90
4.0 7.08
4.1 7.26
4.2 7.44
4.3 7.61
4.4 7.79
4.5 7.97
4.6 8.15
4.7 8.33
4.8 8.50
4.9 8.68
5.0 8.86
5.1 9.04
5.2 9.22
5.3 9.39
5.4 9.57
5.5 9.75
5.6 9.93
5.7 10.11
5.8 10.29
5.9 10.47
6.0 10.64
6.1 10.82
6.2 11.00
6.3 11.18
6.4 11.36
6.5 11.54
6.6 11.72
6.7 11.90
6.8 12.08
6.9 12.25
7.0 12.43

All Angles, 2.00 through 4.00

For any given glide slope angle, multiply groundspeed by conversion to determine descent rate

Detail: All Angles 2.00 to 4.00 degrees
[2.50 deg.] [3.00 deg.] [3.50 deg.] [4.00 deg.]
Glideslope Angle Descent Rate Conversion
2.00 3.54
2.01 3.55
2.02 3.57
2.03 3.59
2.04 3.61
2.05 3.62
2.06 3.64
2.07 3.66
2.08 3.68
2.09 3.70
2.10 3.71
2.11 3.73
2.12 3.75
2.13 3.77
2.14 3.78
2.15 3.80
2.16 3.82
2.17 3.84
2.18 3.85
2.19 3.87
2.20 3.89
2.21 3.91
2.22 3.93
2.23 3.94
2.24 3.96
2.25 3.98
2.26 4.00
2.27 4.01
2.28 4.03
2.29 4.05
2.30 4.07
2.31 4.09
2.32 4.10
2.33 4.12
2.34 4.14
2.35 4.16
2.36 4.17
2.37 4.19
2.38 4.21
2.39 4.23
2.40 4.24
2.41 4.26
2.42 4.28
2.43 4.30
2.44 4.32
2.45 4.33
2.46 4.35
2.47 4.37
2.48 4.39
2.49 4.40
2.50 4.42
2.51 4.44
2.52 4.46
2.53 4.47
2.54 4.49
2.55 4.51
2.56 4.53
2.57 4.55
2.58 4.56
2.59 4.58
2.60 4.60
2.61 4.62
2.62 4.63
2.63 4.65
2.64 4.67
2.65 4.69
2.66 4.70
2.67 4.72
2.68 4.74
2.69 4.76
2.70 4.78
2.71 4.79
2.72 4.81
2.73 4.83
2.74 4.85
2.75 4.86
2.76 4.88
2.77 4.90
2.78 4.92
2.79 4.94
2.80 4.95
2.81 4.97
2.82 4.99
2.83 5.01
2.84 5.02
2.85 5.04
2.86 5.06
2.87 5.08
2.88 5.09
2.89 5.11
2.90 5.13
2.91 5.15
2.92 5.17
2.93 5.18
2.94 5.20
2.95 5.22
2.96 5.24
2.97 5.25
2.98 5.27
2.99 5.29
3.00 5.31
3.01 5.32
3.02 5.34
3.03 5.36
3.04 5.38
3.05 5.40
3.06 5.41
3.07 5.43
3.08 5.45
3.09 5.47
3.10 5.48
3.11 5.50
3.12 5.52
3.13 5.54
3.14 5.56
3.15 5.57
3.16 5.59
3.17 5.61
3.18 5.63
3.19 5.64
3.20 5.66
3.21 5.68
3.22 5.70
3.23 5.71
3.24 5.73
3.25 5.75
3.26 5.77
3.27 5.79
3.28 5.80
3.29 5.82
3.30 5.84
3.31 5.86
3.32 5.87
3.33 5.89
3.34 5.91
3.35 5.93
3.36 5.95
3.37 5.96
3.38 5.98
3.39 6.00
3.40 6.02
3.41 6.03
3.42 6.05
3.43 6.07
3.44 6.09
3.45 6.11
3.46 6.12
3.47 6.14
3.48 6.16
3.49 6.18
3.50 6.19
3.51 6.21
3.52 6.23
3.53 6.25
3.54 6.26
3.55 6.28
3.56 6.30
3.57 6.32
3.58 6.34
3.59 6.35
3.60 6.37
3.61 6.39
3.62 6.41
3.63 6.42
3.64 6.44
3.65 6.46
3.66 6.48
3.67 6.50
3.68 6.51
3.69 6.53
3.70 6.55
3.71 6.57
3.72 6.58
3.73 6.60
3.74 6.62
3.75 6.64
3.76 6.66
3.77 6.67
3.78 6.69
3.79 6.71
3.80 6.73
3.81 6.74
3.82 6.76
3.83 6.78
3.84 6.80
3.85 6.82
3.86 6.83
3.87 6.85
3.88 6.87
3.89 6.89
3.90 6.90
3.91 6.92
3.92 6.94
3.93 6.96
3.94 6.97
3.95 6.99
3.96 7.01
3.97 7.03
3.98 7.05
3.99 7.06
4.00 7.08

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rev. 7 December 2012

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Steve Sconfienza, Ph.D.

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