Leaders of a subcommittee in the U.S. House of Representatives have called for a government review of the Federal Aviation Administration's oversight of the Boeing plane.
Lawmakers noted numerous production issues that have halted deliveries for lengthy periods over the last 13 months.
Leaders of the U.S. House Transportation and Infrastructure Committee want answers on how the FAA is overseeing the process.
Word of stepped-up scrutiny further pushed shares of Boeing lower.
The stock was already under pressure after the Wall Street Journal reported Friday that Boeing had once again cut back on production.
Boeing said that it is "completing comprehensive inspections across 787 production and within the supply chain, while holding detailed, transparent discussions with the FAA, suppliers and our customers."
It also said production is ongoing but inspections and rework efforts are impacting deliveries.
Boeing admitted last month that some titanium parts on the 787 were made incorrectly over the past three years.
That was just one of many problems that have caused it to cut production and halt deliveries since May.
The FAA stepped in in July and ordered Boeing to fix a manufacturing quality issue near the nose of the plane before making customer deliveries.
Shares of Boeing were down nearly 6 percent in late-Friday trading.
