Precision Computations

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Precision Computations

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  • 1Pans-Ops PD Initial Course Circling

    PRECISION APPROACH

    GUIDANCE

    ICAO FPP

    Beijing, China

  • Pans-Ops PD Initial Course Circling 2

    OAS Computation

    Collection of all required data and maps

    Computation of OAS template coordinates and surface equations.

    W z= 0.0285 x 9.01

    X z= 0.027681 x + 0.1825y 18.18

    Y z= 0.023948 x + 0.210054 y 23.18

    Z z= 0.025 x -22.5

    Plotting of OAS surfaces upto 300m.

  • Pans-Ops PD Initial Course Circling 3

    Selection of FAP Altitude

    Selection of desired segment length

    (say 5NM)

    (5*6076*Tan 3)+50+26 = 1668 ft

    ~ 1700 ft

    FAP Height above THR

    1700/3.2808 8 = 510.2 m

  • Pans-Ops PD Initial Course Circling 4

    Computation of of FAP Distance

    (510.2-15) / Tan 3 = 9448.97 m

    ~ 9450 m

    Width at FAP

    X z= 0.027681 x + 0.1825 y 18.18

    510.2 = 0.027681*9450+0.1825 y 18.18

    y = (510.2+18.18-261.59)/0.1825

    y = 1461.86 ~ 1462 m

  • Pans-Ops PD Initial Course Circling 5

    Extension of Precision

    FAP Height 510.2

    Extension required = 510.2-150 = 360.2

    (360.2-15) / Tan 3 = 6586.8 m ~ 6587 m Width at 6587

    360.2= 0.027681 x + 0.1825 y 18.18

    360.2=0.027681*6587+0.1825y 18.18

    y = (360.2+18.18-182.34)/0.1825

    y ~ 1074 m

  • Pans-Ops PD Initial Course Circling 6

    Extension of Precision

    W z=0.0285 x -9.01

    360.2= 0.0285 x 9.01

    x = (360.2+9.01)/0.0285

    x ~ 12955 m

    z= 0.027681 x + 0.1825 y 18.18

    360.2= 0.027681*12955+0.1825y 18.18

    Y ~ 108

  • Pans-Ops PD Initial Course Circling 7

    Extension of Precision

    C(316,51), C (10842,98)

    D(-286,142), D(5438,918)

    New C x = ((10842-316)*360.2/300)+316

    = 12954.22

    New C y = ((9851)*360.2/300)+51

    = 107.43

    New D x = ((5438+286)*360.2/300) 286

    = 6586.6

    New D y = ((918142)*360.2/300)+142

    = 1073.7

  • Pans-Ops PD Initial Course Circling 8

    Extension of Precision

    New Limits

    D (6587, 1074), C (12955,108)

    Precision Surfaces may also be extended graphically just by computation of percentage increased required.

    % Increase = 360.2*100/300 = 120.07%

    Existing length 6 cm, New 7.2042

    (Plotting Errors ?)

  • Pans-Ops PD Initial Course Circling 9

    Assessment of OAS

    Penetration Yes

    Approach or Missed approach

    Computation of equivalent for Missed App

    Computation of OCHps

    Determination of SOC position.

    Is assessment of Basic ILS required ?

  • Pans-Ops PD Initial Course Circling 10

    Missed Approach

    Same as conventional

    OCH adjustment computation, if required.

  • Pans-Ops PD Initial Course Circling 11

    Questions