Form D Control System (DCS) Rules apply only where designated by?

Form D Control System (DCS) Rules apply only where designated by?

• A. Form D Line 6
• B. Timetable, Bulletin Order, or Form D Line 6
• C. Dispatcher verbal instruction
• D. ABS rules

Answer: (B)

Form D Control System rules aren’t universal; they only take effect where official instructions designate them. The timetable and any bulletin orders specify exactly where and under what conditions Form D applies, and a Form D Line 6 entry can designate a specific section for DCS. Because those documents are the authoritative source for where DCS is active, you follow DCS only in the areas shown there. Verbal dispatcher instructions aren’t the standard method for establishing the system, and ABS rules govern a different set of traffic-control provisions, not the designation for Form D.

Form D Control System rules aren’t universal; they only take effect where official instructions designate them. The timetable and any bulletin orders specify exactly where and under what conditions Form D applies, and a Form D Line 6 entry can designate a specific section for DCS. Because those documents are the authoritative source for where DCS is active, you follow DCS only in the areas shown there. Verbal dispatcher instructions aren’t the standard method for establishing the system, and ABS rules govern a different set of traffic-control provisions, not the designation for Form D.