Lesson 2 of 4, 7 min
Route clearance আর Kolkata-য় handover
Clearance-এর ভাষা
- “(Unit) clears (callsign) to (clearance limit) via (route)”; বা “cleared to …”, “recleared (নতুন অংশ) to (পুরনো route-এর point)”।
- “Via flight planned route”, “via (route বা reporting points)”, “direct”, “via 20 miles arc north of (DME)”।
- “Enter control area via (point) at (level) at (time)”, “leave control area at (level) / climbing / descending”, “join (airway) at (point) at (level)”।
- “(Level বা route) not available due (কারণ), alternative(s) is/are … advise”।
- Clearance দেওয়া না গেলে: “expect clearance at (time)”।
Level ধরে রাখা আর cross করা
- “Maintain (level) until passing (point) / until (time) / until further advised”।
- “Cross (point) at (বা above, below) (level)”; “cross (point) at (time) or later (বা before) at (level)”; “cross 25 DME (station) at or above …”।
- “Cruise climb between (levels)”; separation-এর জন্য “maintain Mach .82”, “advise if able to cross (point) at (time)”।
- Terminal delay en route-এ শুষে নিতে: “at (time বা position) descend to (level) for en route delay of 10 minutes”।
Emergency descent
Pressurisation হারিয়ে নামতে হলে pilot বলে “emergency descent” আর তার intention। ATC বাকিদের জানায়: “emergency descent at (জায়গা), all aircraft below (level) within (distance) of (point) leave immediately”, সাথে দিক বা heading।
Dhaka থেকে London: Dhaka Control থেকে Kolkata Control
Dhaka Delivery
“Bangladesh 3, cleared to London Heathrow via flight planned route, initial climb flight level 150, squawk 4521”
Clearance limit, route, level, SSR code: সবই readback।
Pilot
“Cleared to London Heathrow via flight planned route, initial climb flight level 150, squawk 4521, Bangladesh 3”
Dhaka Delivery
“Bangladesh 3, readback correct”
Dhaka Control
“Bangladesh 3, maintain flight level 330, cross the FIR boundary at flight level 330 or above, contact Kolkata Control 127.3 at the boundary”
পরে, cruise-এ। FIR boundary-তে handover।
Pilot
“Maintain flight level 330, cross the boundary at flight level 330 or above, Kolkata 127.3 at the boundary, Bangladesh 3”
Pilot
“Kolkata Control, Bangladesh 3, flight level 330”
নতুন station: পুরো callsign আর level।
