Advisory Circulars provide explanatory information and examples of how to comply with Civil Aviation Rules.
This draft has been expanded from the initial issue in April 2018, and some sections have changed in order.
The new expanded sections have been drawn from international sources and in response to common queries to CAA. It aims to provide more operational detail for participants to help them meet requirements. In particular, sections 6.6, 6.13, 6.15, 7.9 from the initial issue have been expanded, while 6.10 has been largely moved to 6.2 in the new version.
Following feedback that changes in draft ACs can be hard to track, we are also trialling a new method of highlighting changes. In this draft, new or expanded sections have been highlighted in yellow, and deleted sections have been struckthrough. Feedback on whether this makes it easier to comment on AC content would be welcomed.
We look forward to receiving your feedback.
Comments close 18 December 2020
Please send comments to:
Comments closed 11 November 2020
Team Leader Licensing & Standards
Comments closed 10 November 2020
From feedback we received during the consultation period, it's clear that the timing of this revision may have caused some confusion. The AC was written to reflect how we currently process PBN operational requests, and was a long awaited revision of AC 91-21 Rev 0.3.
The ongoing work on the PBN Rule Framework (PBN RF) which progressed while the CAA was working on this revision (for which the AC will need an additional revision), as well as the current status of industry as a result of the COVID-19 pandemic, has put the timing of this revision into question.
As to not place an undue burden on industry, the CAA has decided not to officially publish AC91-21 Rev 1 at this time. Any provided feedback will be used in the ongoing work for the revision of AC91-21 which will align with the PBN RF and will be consulted on in due course.
Comments closed 15 May 2020
Flight Operations Inspector
Read in conjunction with NPRM 19-04 (Part 61 Private Pilot Licence Medical Review)
Comments closed 27 January 2020
Aviation Examiner - Licensing and Flight Training
Comments closed 10 January 2020
Senior Technical Specialist – Flight Test Engineering
Comments closed 13 November 2019
Airworthiness Engineer (Avionics)
Comments closed 25 July 2019
Team Leader Airworthiness General Aviation
Revision 2 updates the dangerous goods items that are acceptable to carry by passengers on board for recreational or sporting activities; list of substance by class or division and examples of items; and emergency procedure to include the appropriate ATS unit in the communication of any dangerous goods on board.
Comments closed 12 Apr 2019
Aeronautical Services Officer