Newly issued airworthiness directive AD 2013-03-07 for the Hawker 400A was prompted by a report that the cockpit wiring for the 5-volt direct current (DC) system on the aircraft is undersized and does not have adequate circuit protection for the smaller gauge wire. The directive, which is effective as of March 19, requires installation of an in-line fuse in the 5-volt DC system for each of the five instrument lighting control power supplies.
The FAA plans to issue Airworthiness Directive FAA-2012-1111 to address wiring issues on the Beechjet 400A. The AD was prompted by a report that the wiring for the five-volt direct-current system is undersized and does not have adequate circuit protection for the smaller-gauge wire. This proposed AD would require installing an in-line fuse in the five-volt DC system for each of the five instrument lighting control power supplies.
The FAA issued a draft policy memorandum that would change circuit-breaker layouts in aircraft electrical systems, as well as how pilots deal with tripped circuit breakers. Comments are due by September 12. Principal changes would be for manufacturers to group and identify essential and non-essential circuit breakers in Part 23 aircraft and to publish flight manual guidance about when to reset circuit breakers.
The FAA has issued a draft policy memorandum that seeks to change attitudes about circuit breaker use in electrical systems and how pilots deal with popped circuit breakers. The policy would affect aircraft manufacturers and modification providers. Comments are due by September 12.