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RADIO NAV — CH.17

EFISRadio Navigation — DGCA CPL practice questions

Question 1 of 9

The orientation of the PLAN mode of an EHSI display is:

A.magnetic north-up
B.track-up
C.true north-up
D.heading-up

All 9 questions — EFIS

Radio Navigation · DGCA CPL. The correct option is marked on each.

  1. Q1. The orientation of the PLAN mode of an EHSI display is:

    • A.magnetic north-up
    • B.track-up
    • C.true north-up✓
    • D.heading-up

    Why: PLAN mode is oriented to true north-up . All other EHSI modes (VOR, ILS, MAP) are heading-up.

  2. Q2. Weather radar information can only be displayed in:

    • A.MAP mode only
    • B.expanded VOR/ILS and MAP modes✓
    • C.all modes
    • D.full rose and MAP modes

    Why: WXR (weather) and TCAS can only be displayed in Expanded VOR/ILS and MAP modes.

  3. Q3. The colour used for the active FMS flight plan path on an EHSI is:

    • A.green
    • B.white
    • C.magenta✓
    • D.cyan

    Why: The active FMS flight plan path is shown in magenta . Green = normal/active modes. White = scales/present values. Cyan = sky/selected altitude/heading bug.

  4. Q4. The EHSI symbol generator receives inputs from:

    • A.VOR, ILS, DME only
    • B.VOR, ILS, DME, ADF, FMS, AWR, TCAS✓
    • C.FMS only
    • D.ILS and VOR only

    Why: Symbol generators process inputs from: VOR, DME, ILS, ADF, FMS, AWR, and TCAS .

  5. Q5. According to EASA CS-25, which colour is used exclusively for warnings:

    • A.amber
    • B.green
    • C.white
    • D.red✓

    Why: Red is used exclusively for warnings requiring immediate action. Amber/yellow for cautions. Green for normal operations. White for scales.

  6. Q6. Range arcs on the EHSI are displayed in:

    • A.MAP mode only
    • B.all modes at all times
    • C.expanded VOR/ILS when WXR selected, and MAP mode always✓
    • D.full rose modes only

    Why: Range arcs (white) displayed in expanded VOR and ILS modes when WXR is ON , and in MAP mode at all times .

  7. Q7. On the EHSI Expanded VOR display, the aircraft is shown 7.5° to the right of track 165°. The course deviation bar will appear:

    • A.7.5° to the left of the aircraft symbol✓
    • B.7.5° to the right
    • C.directly ahead
    • D.behind the aircraft

    Why: If the aircraft is to the RIGHT of track, the course bar (track) is displaced to the LEFT of the aircraft symbol — same as a CDI where the needle deflects toward the selected course.

  8. Q8. The TCAS switch on the EHSI controller, when pressed with TCAS already displayed:

    • A.increases TCAS range
    • B.removes TCAS from display
    • C.changes TCAS mode✓
    • D.has no effect

    Why: Pressing TCAS when displayed removes TCAS information . When TCAS FAIL is displayed, pressing it removes the message.

  9. Q9. Selectable overlays available in MAP mode include:

    • A.VOR/ADF, airports, waypoints, weather
    • B.ILS only
    • C.weather only✓
    • D.waypoints and ILS only

    Why: In MAP mode, the selectable overlays are: VOR/ADF radials, NAVAIDs, airports, waypoints, route data, weather (WXR), and TCAS .