An aircraft following the VLC 2N STAR procedure performs an emergency descent, due to cabin depressurization, 20 NM before reaching at BESOR IAF. What is the minimum permitted altitude or FL along the STAR procedure which provides the required obstacle and terrain clearance immediately after the beginning of the emergency descent?
Refer to figure.
The chart 10-2B depicts four STAR procedures: CALLES 1L (CLS1L), CALLES 2N (CLS2N), VALENCIA 2L (VLC2L) and VALENCIA 2N (VLC2N) for Rwy 10/28 of the Alicante airport.
The VLC2N STAR procedure starts from the VLC VOR/DME and ends at BESOR Initial Approach Fix (IAF), after which an approach procedure will commence.
When performing an emergency descent, without delay, the pilots must descend to the lowest safe altitude or 10 000 ft, whichever is higher.
The Minimum Sector Altitude (MSA) is the lowest altitude which may be used which will provide a minimum clearance of 300 m (1 000 ft) above all objects located in the area contained within a sector of a circle of 46 km (25 NM) radius centred on a radio aid to navigation.
The highest obstacle along VLC2N is 5 110 ft high, outside the MSA and it is above 5 000 ft, so we need 2 000 ft clearance. Therefore the minimum altitude the aircraft may descend to is 7 110 ft.
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