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Consider the following statements about instrument operations on parallel runways. What is correct for departing and arriving aircraft?

1. Independent operations means both runways are used exclusively for departures
2. Independent operations means one runway is used exclusively for departures while the other runway is used for a mixture of arrivals and departures
3. Mixed operations means both runways are used for mixed arrivals and departures
4. Dependent parallel approaches are simultaneous instrument operations
5. Independent parallel approaches are simultaneous instrument operations
6. Semi mixed independent parallel approaches are simultaneous instrument operations

  • A

    Departure: 2 and 3; Arrival: 2 and 4

  • B

    Departure: 1 and 3; Arrival: 4 and 5

  • C

    Departure: 1 and 3; Arrival: 5 and 6

  • D
    Departure: 2 and 3; Arrival: 4 and 6

"1. Independent operations means both runways are used exclusively for departures" Correct ⇒ This refers to Independent parallel departures: In this mode, aircraft are departing in the same direction from parallel runways simultaneously.

"2. Independent operations means one runway is used exclusively for departures while the other runway is used for a mixture of arrivals and departures" Incorrect ⇒ As you can see above, independent operations means that aircraft are departing/approaching in the same direction. This statement is instead the definition of semi-mixed operations.

"3. Mixed operations means both runways are used for mixed arrivals and departures" Correct ⇒ Mixed operations: All modes of operation are possible.

"4. Dependent parallel approaches are simultaneous instrument operations" and "5. Independent parallel approaches are simultaneous instrument operations" Correct ⇒ Dependent parallel approaches and Independent parallel approaches are simultaneous parallel instrument approaches.

"6. Semi mixed independent parallel approaches are simultaneous instrument operations" Incorrect ⇒ Dependent parallel approaches and Independent parallel approaches are simultaneous parallel instrument approaches.

Now, we just need to find the option which includes "1, 3, 4 and 5".


MODES OF OPERATION
There can be a variety of modes of operation associated with the use of parallel or near-parallel instrument runways.

Modes One and Two — Simultaneous parallel instrument approaches
There are two basic modes of operation for approaches made to parallel runways:

  • Mode 1, Independent parallel approaches: In this mode, radar separation minima between aircraft using adjacent ILS and/or MLS are not prescribed.
  • Mode 2, Dependent parallel approaches: In this mode, radar separation minima between aircraft using adjacent ILS and/or MLS are prescribed.

Mode 3 — Simultaneous instrument departures

  • Mode 3, Independent parallel departures: In this mode, aircraft are departing in the same direction from parallel runways simultaneously.

Mode 4 — Segregated parallel approaches/departures

  • Mode 4, Segregated parallel operations: In this mode, one runway is used for approaches and one runway is used for departures.

Mixed operations: All modes of operation are possible.

Semi-mixed operations: one runway is used exclusively for departures while the other runway accepts a mixture of approaches and departures; or one runway is used exclusively for approaches while the other runway accepts a mixture of approaches and departures.


"2. Independent operations means one runway is used exclusively for departures while the other runway is used for a mixture of arrivals and departures" Incorrect ⇒ This statement is the definition of semi-mixed operations.

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