Are you considering the receipt slot to be an "operable part" required to comply with 11B-309? Not agreeing or disagreeing, just trying to understand. If so, what's the actual operable part? There isn't a button, switch, lever, or any of the things I would normally consider operable. The receipt itself? Sure, okay, the that would be within the reach range of 48", but what about:
11.8-309.4 Operation. Operable parts shall be operable with
one hand and shall not require tight grasping, pinching or
twisting of the wrist. The force required to activate operable
parts shall be 5 pounds (22.2 N) maximum.
Also I'd point out that 11B-707.5.2 covers receits specifically, and there's no mention of 309 there:
11 B-707 .5.2 Receipts. Where receipts are provided,
speech output devices shall provide audible balance
inquiry information, error messages and all other information
on the printed receipt necessary to complete or verify
the transaction.
Exceptions:
1. Machine location, date and time of transaction,
customer account number, and the machine identifier
shall not be required to be audible.
2. Information on printed receipts that duplicates
information available on-screen shall not be
required to be presented in the form of an audible
receipt.
3. Printed copies of bank statements and checks
shall not be required to be audible.
It seems like the intent is that the required information be available in such a way that doesn't require grasping a receipt.