14 CFR Part 382 Nondiscrimination on the Basis of Disability in Air Travel (Air Carrier Access Act) (with amendments issued through May 2016)

(c) Any other aircraft model determined by the Department of Transportation to be unsuitable for boarding and deplaning assistance by lift, ramp, or other suitable device.

The Department will make such a determination if it concludes that—

(1) No existing boarding and deplaning assistance device on the market will accommodate the aircraft without a significant risk of serious damage to the aircraft or injury to passengers or employees, or

(2) Internal barriers are present in the aircraft that would preclude passengers who use a boarding or aisle chair from reaching a non-exit row seat.