Joining Controlled — Page 133, Lesson 118

I want to walk you through the procedures for joining controlled airspace under IFR — that's Instrument Flight Rules. This is a structured dialogue between a pilot and Air Traffic Control, and I'll explain each part as we go. Let's start with the IFR joining procedure. The example shows a call from "London Control Speedbird 123 maintaining FL150." Here, "Speedbird" is the airline callsign, and the pilot reports they are maintaining Flight Level 150 — that's 15,000 feet on the standard pressure setting of 1013.2 hectopascals. ATC then issues a clearance: "Speedbird 123 is cleared to enter controlled airspace at Brecon FL150 route to Oxford via Golf 1. Leave controlled airspace at Malby." This is the full airways clearance. "Brecon" is a reporting point or a fix where the aircraft will enter the controlled airspace. "Golf 1" is an airway — a designated route through controlled airspace. "Malby" is the exit point where the aircraft will leave controlled airspace. The pilot acknowledges with "Wilco" — that means "will comply" — and then reads back the clearance: "Speedbird 123 is cleared to enter controlled airspace at Brecon FL150 route to Oxford via Golf 1. Leave controlled airspace at Malby." This readback is mandatory; ATC must confirm it's correct. ATC then says "Speedbird 123 readback correct. Report at Alvin." So the pilot must report when reaching Alvin, the next reporting point along the route. Now, the pilot is also given a transponder code: "Squawk 2156." "Squawk" means set the transponder to code 2156. And the frequency: "Contact London Control 123.125 for airways clearance." So the pilot changes to that VHF frequency to receive the full clearance. Next, we see the format for position reports. The standard format is: "Call sign, Position, time, Flight Level, Next position, time." In the example: "Speedbird 123 Alvin 25 FL150 Wotan 30." That means: Speedbird 123 is at Alvin at time 25 past the hour, at Flight Level 150, estimating Wotan at time 30 past the hour. ATC simply acknowledges with "Roger" — meaning the message is received. Now we move to descent. The pilot requests: "Speedbird 123 Request leave controlled airspace by descent." ATC responds: "Descend FL120. Expect further descent when clear of controlled airspace. Speedbird 123." So the pilot is cleared to descend to Flight Level 120, but cannot descend further until actually outside controlled airspace. The pilot acknowledges with "Negative" — wait, let me re-read that carefully. Actually, the pilot says "Negative" then ATC says "Speedbird 123 Descend now to FL120. Expect further descent when clear of controlled airspace." So the initial request was denied, then ATC issues a revised clearance to descend to FL120 now, with further descent expected once clear. Now we move to the IFR arrival phase. The pilot calls "Oxford Approach Speedbird 123 FL80 Estimate Chalo 45 Information Delta." This means: the aircraft is at Flight Level 80, estimating Chalo at time 45 past the hour, and has received ATIS Information Delta — the current aerodrome weather information. ATC responds: "Speedbird 123 QNH 1001. Descend to altitude 2500 ft." QNH is the pressure setting that, when set on the altimeter, shows altitude above mean sea level. So the pilot sets 1001 hectopascals and descends to 2500 feet altitude. The pilot acknowledges: "QNH 1001 Descending 2500 ft Speedbird 123." Then ATC gives a heading: "Speedbird 123 turn right 020 degrees for separation." This is a radar vector to maintain separation from other traffic. The pilot acknowledges "Wilco." Next: "Speedbird 123 self position for ILS runway 19. Report at Hey." "Self position" means the pilot must navigate to position the aircraft for the ILS — Instrument Landing System — approach to runway 19. "Report at Hey" means call ATC when reaching the fix named Hey. The pilot reports: "Speedbird 123 Heavy 2500 ft." "Heavy" indicates a large aircraft type that requires extra wake turbulence separation. ATC says "Right 180" — meaning turn right to heading 180 degrees. The pilot acknowledges "Wilco." ATC then says: "Speedbird 123 turn right heading 180 closing localiser from the right. Report established." The localiser is the lateral guidance component of the ILS. The pilot turns to intercept the localiser from the right side. The pilot reports: "Speedbird 123 Localiser established." ATC clears the approach: "Cleared ILS runway 19. Wilco." The pilot acknowledges. The pilot then reports: "Speedbird 123 Outer marker." The outer marker is a radio beacon at a fixed distance from the runway threshold. ATC says: "Speedbird 123 Roger. Cleared ILS approach runway 19. Report outer marker." Wait — the pilot already reported outer marker, so ATC acknowledges and then says "Contact tower 118.875." That means switch to the tower frequency. The pilot confirms: "On tower 118.875." Then calls: "Oxford tower Speedbird 123 outer marker." Tower responds: "Cleared to land Speedbird 123." The pilot acknowledges: "Speedbird 123 Oxford tower Cleared to land runway 19." Now let's look at the NDB approach profile. NDB stands for Non-Directional Beacon — a ground-based radio navigation aid. The callsign here is "GBODA" — a different aircraft. The pilot calls: "Oxford Approach GBODA Chalo 45 FL80 Estimate OX at 50." That means: at Chalo at time 45, Flight Level 80, estimating OX at time 50. ATC says: "Hold at OX FL45. GBODA." The pilot must enter a holding pattern at the fix OX at Flight Level 45. The pilot acknowledges: "GBODA OX FL45 Entering the hold." ATC says "Roger GBODA." Then the pilot calls again: "GBODA Oxford Approach hold OX at FL45. Expect NDB approach runway 19." ATC responds: "GBODA expected approach time 55." That means the approach is expected to begin at time 55 past the hour. ATC then issues the clearance: "Cleared for NDB approach runway 19. Wilco GBODA." The pilot acknowledges. The pilot reports: "GBODA beacon outbound." That means the aircraft has passed the NDB beacon and is now flying outbound on the procedure. ATC says: "Wilco GBODA. GBODA report base turn complete." The base turn is the turn from the outbound leg onto the final approach course. The pilot reports: "GBODA base turn complete." ATC says: "Tower 118.875 GBODA." So the pilot switches to tower frequency. The pilot calls: "Oxford Tower GBODA long final runway 19." "Long final" means the aircraft is on final approach but still some distance from the runway. Tower responds: "Cleared to land GBODA." The pilot acknowledges: "GBODA Oxford tower Cleared to land." That figure shows pressure setting examples, which relate to the QNH setting we discussed during the ILS arrival. So to summarise: you've seen the full sequence for joining controlled airspace — the initial clearance, position reports, descent clearance, arrival with QNH setting, radar vectors, ILS approach, and the NDB approach with holding, beacon outbound, base turn, and final landing clearance. Each step has a specific phraseology that must be used precisely.