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Refer to figure or ALICANTE - Chart 10-3A from Jeppesen GSPRM 2017.
Your departure is via CATON 3A and you are cleared to FL80. Due to a restriction you have to remain at 2000 ft until passing VOR/DME ALT. QNH is 1040 hPa, ROC is 800 ft/min and GS is 133 kts. When are you going to reach the top of climb (ToC)?

  • A

    4 NM after VILNA

  • B
    1 NM after VILNA
  • C

    4 NM before VILNA

  • D

    1 NM before VILNA

Refer to figure. 
The aircraft is are cleared to FL80. However, the pilot must maintain 2000 ft (QNH set) until passing ALT VOR.

Altitude Correction = 1040 - 1013 = 27 hpa = 27 x 30 = 810 ft 
Pressure altitude = 2000 - 810 = 1190 ft

  • The aircraft must climb from approx. 1200 ft to 8000 ft = 6800 ft at a ROC of 800 ft/min. 
    Climb time = 6800 / 800 = 8.5 minutes. 
    Ground distance = (8.5 / 60) x 133 = 18.8 NM (approx. 19 NM
  • The aircraft will reach its Cruising altitude 19 NM after starting the climb at ALT VOR. 
    Distance from VOR to VILNA = 20 NM 
    Airplane will reach Cruising altitude 1 NM before VILNA.

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