Document ID: chunk:federal_register_of_legislation:F2025C00187:reg:1
Version: federal_register_of_legislation:F2025C00187
Segment Type: reg
Provision Reference: reg 1
Character Range: 256266–258767

1     When the pilot in command considers it reasonably necessary to broadcast to avoid the risk of a collision with another aircraft  Broadcast

21.05 Controlled aerodromes and controlled airspace — prescribed reports
       (1) The pilot in command of 1 of the following:
(a) an aircraft on the ground at a controlled aerodrome;
(b) an aircraft in Class A, B, C or D airspace;
(c) an IFR aircraft in Class E airspace;
        must:
(d) subject to subsections (1A), (1B) and (1C), ensure that reports to the ATC service are made in accordance with Table 21.05 (1); and
(e) ensure that reports and broadcasts are made in accordance with the other applicable provisions of this Chapter.
       (1A) Despite paragraph (1) (d), for item 10 of Table 21.05 (1), to ensure that separation with any aircraft operating near the base of controlled airspace is not compromised, the required report is to be made to the air traffic service for the Class G airspace volume that the aircraft will descend into after leaving controlled airspace.
       (1B) Despite paragraph (1) (d), for item 5 of Table 21.05 (1), a report to correct a previously reported incorrect position estimate (a previous estimate) is not required if an aircraft's position is being automatically reported by an ADS-C system, unless the previous estimate was:
(a) from a flight crew member and not the ADS-C; or
(b) due to a flight crew member initiated action.
Note   An example of a flight crew member initiated action is a manually initiated speed change.
       (1C) Despite paragraph (1) (d), for item 11 of Table 21.05 (1), a report to cancel SARWATCH is not required if an aircraft has arrived at a controlled aerodrome during tower hours.
Note   SARWATCH is automatically cancelled by ATC without the need to report to ATC.
       (2) For Table 21.05 (1), for an item in the Table, the pilot in command in the situation mentioned for the item in column 1 must ensure that the report mentioned for the item in column 2 is made.

Table 21.05 (1) – An aircraft at a controlled aerodrome, or in Class A, B, C or D airspace, or an IFR aircraft in Class E airspace – reports

      Column 1                                                                                                                                                              Column 2
Item  Situation                                                                                                                                                             Report