The U.S. aircraft register, updated daily
Special conditions · electric or hybrid design · aircraft

Special Conditions: Honda Aircraft Company, Model HA-420 HondaJet, Lithium-ion Batteries

Special conditions are rules the FAA writes for one design when the standard certification rules do not cover something new about it. These were published September 22, 2015 for Honda Aircraft Company, covering the HA-420. System: electric propulsion.

What it applies to

Applicant
Honda Aircraft Company
Makes
Honda Aircraft Company
Models
HA-420
On this site
Honda Aircraft Co Llc HA-420 236 registered
Published
September 22, 2015
Effective
September 22, 2015
The FAA's document
On the FAA's site

The FAA's summary their words, unchanged

These special conditions are issued for the Honda Aircraft Company, Model HA-420 airplane. This airplane will have a novel or unusual design feature associated with the installation of lithium-ion (Li-ion) batteries. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. These special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.

Source: FAA special conditions (final) from the Dynamic Regulatory System; the Federal Register carries the same notices.