Document ID: chunk:federal_register_of_legislation:F2023C00696:body:0:p83
Version: federal_register_of_legislation:F2023C00696
Segment Type: other
Provision Reference: 
Character Range: 302638–305603

is lost, but the remaining altimetry system is functioning normally, the controller should acknowledge the situation and continue to monitor the flight's progress.
Note: RVSM separation may still be applied in this instance.

Section 13.2:   In Flight Emergency Response

13.2.1              Emergency Changes of Level

13.2.1.1         As an emergency measure, the use of flight levels separated by 500 FT (below FL290 or in RVSM airspace) or 1,000 FT (at or above FL290 in non-RVSM airspace) may be used temporarily when standard procedural separation cannot be applied provided that traffic information is issued.

13.2.1.2         If an emergency makes it necessary to clear all traffic from a particular area, ATC must broadcast the following message:

(a)         "EMERGENCY TO ALL CONCERNED. EMERGENCY CLIMB/DESCENT AT… (location)." Then as required by circumstances;

(b)         (for aircraft in holding pattern) "ALL AIRCRAFT ABOVE/BELOW ... (level) TURN RIGHT 90 DEGREES (for left hand holding pattern or left 90 degrees for right hand pattern)".

13.2.2              Fuel Dumping

13.2.2.1         Airspace affected by the fuel dumped from an aircraft in flight is known as the 'vapour zone' and is defined as that airspace at least 1,000 FT above, 2,000 FT below, 5 NM horizontally behind and ½ NM on each side of the aircraft.

13.2.2.2         In an emergency, or when fuel must be dumped without adequate warning or delay, controllers must make every effort to keep other aircraft clear of the 'vapour zone'. Additionally, ATS is responsible for:

(a)         noting the area where jettison was affected;

(b)         recording weather conditions and reporting the incident to the appropriate authority without delay.

13.2.2.3         In other than emergency circumstances ATS must specify which section of a nominated track may be used for the dumping of fuel and recommend that aircraft maintain a minimum height of 6,000 FT AGL. For safety reasons fuel is not to be dumped in a circular or race-track pattern.

13.2.2.4         For the purpose of providing separation, all the airspace containing the track specified, the selected altitude and a full allowance for the 'vapour zone' must be treated as reserved airspace from the time dumping is expected to commence until 5 MIN after it has been completed.

13.2.2.5         Known aircraft in Class G airspace likely to be affected are to be warned of the fuel dumping and the approximate location of the 'vapour zone'.

13.2.2.6         The warning must also be broadcast on the appropriate frequencies. Warnings are to continue during the period of fuel dumping and for 5 MIN after it has been completed.

Chapter 14:   Aeronautical Communications

Section 14.1:   General

14.1.1              Acknowledging Receipt of Verbal Coordination

14.1.1.1         When an ATS unit receives a verbal clearance or instruction from another ATS unit that includes any of the following, it must read back: