Use of Portable Electronic Devices Aboard Aircraft
Use of portable electronic devices aboard aircraft — which devices are allowed and how to guard against interference.
About this document
AC 91.21-1, Use of Portable Electronic Devices Aboard Aircraft, explains the rule (14 CFR 91.21) governing passenger and crew use of portable electronic devices. It describes how such devices can interfere with aircraft navigation and communication systems, which devices are generally permitted, and how operators determine that a device will not cause interference.
Read it online
Read the full document below, or download it from the FAA using the button above. Large documents open the first page immediately — you don’t wait for the whole file.
Loading document…
Ready to test what you’ve read?
Drill ACS-aligned practice questions with instant explanations — free, no account needed.
Take a free practice test →AC-91.21-1 is an official FAA publication in the public domain. We host a copy so you can read it in-browser; always confirm you are reading the current edition on faa.gov. The description above is an original summary and is a study aid, not a substitute for the document or the regulations.