The FAA library and the cover-date trap
The bookstore copy printed this year may be six years stale - and the copy that looks old may be current. The cover date is marketing; the reference letter is truth.
The library: P-HAK (Pilot's Handbook of Aeronautical Knowledge) as THE primary reference and the one book to buy on paper; the Airplane Flying Handbook (technique, not ground knowledge); the Risk Management Handbook; the Aviation Weather Handbook ('massive'); the ACS - which lists every testable topic but 'contains no instructional content'; Advisory Circulars (non-regulatory guidance, numbered like AC 60-22); and the FAR-AIM, two documents bound as one. Digitally he prefers ecfr.gov for the regulations.
The versioning rule that protects you: publishers reprint covers yearly, but FAA content updates 'every four to six years if that.' The real currency indicator is the last letter of the FAA reference number - no letter is the first edition, then A, B, C. 'If I tell you to download the C then you're gonna be looking for that number.'
Every later chapter cites these documents by section; studying a superseded edition means studying superseded answers.
Go deeper
In one line: FAA study set = P-HAK (primary) + ACS (topic list, no content) + FAR-AIM + handbooks + ACs; currency read from the reference-number letter suffix, never the cover date; all free on the FAA site.
Paper covers reprint yearly; content updates every 4-6 years at most (l9058 0:01)
Version letter: blank -> A -> B -> C = newest (l9058 0:01)
P-HAK is the one book to own; ACS lists testable topics but teaches nothing (l9058 0:03-0:04)
Advisory Circulars = non-regulatory guidance, e.g. AC 60-22 on decision-making (l9058 0:05)
ecfr.gov preferred for regulations digitally (l9058 0:06)
Check any FAA handbook you own: find its reference number and last letter, then compare against the FAA's free download page before trusting it.
▶ Watch this taught:
Answer from memory first — the recall attempt is what makes it stick. Then reveal.
Two copies of the P-HAK: one printed 2024 with no version letter, one printed 2021 marked 'B'. Which is current?
The 'B' - the letter suffix marks the edition. A letterless copy is the FIRST edition regardless of how recently its cover was printed.