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The isad: ( )
288 0.5 0.00198
elev ltpelev ISA
isad
ISA elev
Δ
Δ
− ⋅
=
+ − ⋅ ⋅
8260.52 6/3/05
Appendix 1
Page 2
The bg bias:Straight segments fixed values: narrow body bg = 15
wide body 25
RF segments: narrow body bg = semispan⋅ sinφ
wide body bg = semispan⋅ sinφ
Sample Calculations:
Design Variables
Applicable facility temperature minimum is 20° C below standard: (ΔISA = −20)
Required navigational performance (RNP) is .14 NM: (rnp = 0.14)
Wing semispan of 68 ft: (semispan = 68)
Special Aircraft and Aircrew Authorization Required (SAAAR) Fixed Values
Vertical flight technical error (FTE) of two standard deviations
is assumed to be 75 ft: (fte = 75)
Automatic terminal information service (ATIS) two standard deviation altimeter setting
vertical error is assumed to be 20 ft: (atis = 20)
The maximum assumed bank angle is 18°: (φ = 18°)
Glidepath Variables
Precision Final Approach Fix Altitude (PFAF) is 4,500 ft: (4,500ft)
Landing Threshold Point Elevation (ltpelev): (ltpelev = 1200)
Threshold Crossing Height (tch): (tch = 55)
Glide Path Angle ( θ ): θ = 3
Calculations:
4 2 2 2 2 2 2
3
roc=bg−isad+ anpe +wpr +fte +ase +vae +atis
The anpe:
1225 1852
03048
1225 014 1852 3
03048
546117
. tan
.
. . tan
.
.
anpe= ⋅rnp⋅ ⋅ θ
= ⋅ ⋅ ⋅ °
The wpr:
60
60 3
31445
tan
tan
.
wpr = ⋅ θ
= ⋅ °
=
6/3/05 8260.52
Appendix 1
Page 3
The fte: fte = 75
The ase: ase = −8.8 ⋅10−8⋅(elev)2 + 6.5 ⋅10−3⋅(elev)+ 50
( ) ( )
( ) ( )
8 2 3
8 2 3
250 88 10 250 65 10 250 50
88 10 1200 250 65 10 1200 250 50
59 2400
. .
. .
.
ASE − ltpelev − ltpelev
− −
=− ⋅ ⋅ + + ⋅ ⋅ + +
= − ⋅ ⋅ + + ⋅ ⋅ + +
=
( ) ( )
( ) ( )
8 2 3
8 2 3
88 10 65 10 50
88 10 4500 65 10 4500 50
77 4680
. .
. .
.
ASEpfaf − PFAF − PFAF
− −
= − ⋅ ⋅ + ⋅ ⋅ +
= − ⋅ ⋅ + ⋅ ⋅ +
=
The vae: (tan tan( 0.01 ))
tan
vae elev ltpelev θ θ
θ
= −  − − °
 
( ( ))
( ( ))
001
4500 1200 3 3 001
3
110200
tan tan .
tan
tan tan .
tan
.
pfaf
VAE PFAF ltpelev θ θ
θ
= −  − − °
 
= − °  °− ° − °
=
( ( ))
( ( ))
250
250 001
250 3 3 001
3
8349
tan tan .
tan
tan tan .
tan
.
VAE θ θ
θ
=  − − °
 
= ° °− ° − °
=
The isad: ( )
288 0.5 0.00198
elev ltpelev ISA
isad
ISA elev
Δ
Δ
− ⋅
=
+ − ⋅ ⋅
( )
( )
( ) ( )
( )
288 05 000198
4500 1200 20
288 20 05 000198 4500
1745432
. .
. .
.
pfaf
PFAF ltpelev ISA
ISAD
ISA PFAF
Δ
Δ
− ⋅
=
+ − ⋅ ⋅
− ⋅ −
=
− − ⋅ ⋅
= −
( )
( )
( )
250
250
288 05 000198 250
250 20
288 20 05 000198 1200 250
187572
. .
. .
.
ISAD ISA
ISA ltpelev
Δ
Δ
⋅
=
+ − ⋅ ⋅ +
⋅ −
=
− − ⋅ ⋅ +
= −
The bg: 68 18
210132
sin
sin
.
bg=semispan⋅ φ
= ⋅ °
=
8260.52 6/3/05
Appendix 1
Page 4
2 2 2 2 2 2
250
2 2 2 2 2 2
250 4 250 250
3
210132 187572 4 54 6117 31445 75 592400 08349 20
3
1890049
. . . . . .
.
ROC = bg − ISAD + anpe + wpr + fte +ASE +VAE +atis
　
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