In that case, the FAA appointed a team of “experienced technical and managerial personnel . . . with no prior involvement in the Eclipse 500 type-certification program” to perform a 30-day review to determine if the aircraft was certificated “in conformance with [regulations] in four areas—cockpit displays/screen blanking, stall speeds, trim and flaps.” The SCR team followed a flow diagram that started with a review of the certification basis for the very light jet—including special conditions, policy memos and ELOS papers—and ended with an assessment of reported anomalies based on the system safety assessment prepared by Eclipse during the certification. Along with interviews, the group reviewed service difficulty reports before coming up with eight “findings” and six recommendations to improve the aircraft.
For the 787, the FAA and Boeing released few details about the specifics of their joint inquiry into the certification, production and quality control aspects of the aircraft when launching the comprehensive review of the new twinjet, prompted in large part by a series of battery problems.
FAA Administrator Michael Huerta on Jan. 11 said the emphasis would be on the widebody's electrical system, which depends on lithium-ion batteries as its primary power storage medium, as well as the power-distribution system and interaction between various mechanical and electrical systems.
The agency added key details on Jan. 16, however when it grounded the U.S. fleet of six 787s owned by United Airlines, via an emergency airworthiness directive.
The action was prompted by an inflight emergency on an All Nippon Airways (ANA) 787 after the crew received warning lights and detected an odor. Though the incident ended in a safe landing with passengers evacuating to the runway on slides, a preliminary investigation revealed a failure of the lithium-ion battery. Dots were connected between the ANA incident and a battery failure on a Japan Airlines 787 on the ground at Boston Logan International Airport on Jan. 7. Both aircraft had battery failures that “resulted in release of flammable electrolytes, heat damage and smoke,” states the FAA.
As a result, the U.S. airline safety agency is now saying the comprehensive review will also include a validation “that 787 batteries and the battery system on the aircraft are in compliance with the special condition the agency issued as part of the aircraft's certification.”
The new details more tightly couple the FAA to both the problem and the solution since the agency, by regulation, must be “directly involved” in safety and compliance decisions for special conditions, meaning the work cannot be outsourced to designated engineering representatives at Boeing.
In this case, FAA had approved “special conditions” for certifying the lithium-ion batteries, a required step as legacy type-certification rules do not cover the advanced technologies. Other companies, including Airbus and Gulfstream Aerospace have received similar approvals for lithium-ion batteries for use on the A380 and G650, respectively. Airframers will generally demonstrate that proposed new technologies will have an equivalent level of safety (ELOS) to traditional systems through analyses and “issue” papers that the FAA must approve.
The FAA has not set a timeline for its 787 review to be wrapped up. “We'll see where the data take us,” says Huerta.