WASHINGTON, Sept 19 (Reuters) - SpaceX said Thursday it

"forcefully rejects" the Federal Aviation Administration's

conclusion that Elon Musk's company failed to follow U.S.

regulations during two rocket launches, alleged violations

carrying $633,000 in fines.

The FAA on Tuesday faulted SpaceX's actions ahead of

launches in June and July of 2023 in Cape Canaveral, Florida,

prompting Musk to call the fines politically motivated and

threaten to sue to contest them.

Musk has chafed for years at what he sees as government

inefficiency and has battled with federal regulators. SpaceX

must obtain FAA signoffs for rocket launches and new technology.

Late Thursday Musk asserted FAA leaders attacked SpaceX "for

petty matters that have nothing to do with safety, while

neglecting real safety issues at Boeing ( BA ). This is deeply wrong

and puts human lives at risk."

Musk cited the NASA decision not to have astronauts return

to earth in Boeing's ( BA ) Starliner spacecraft after a

three-month test mission hobbled by technical issues. "Instead

of fining Boeing ( BA ) for putting astronauts at risk, the FAA is

fining SpaceX for trivia!" Musk wrote on X.

Neither the FAA nor Boeing ( BA ) responded to requests for comment

about Musk's X post.

David Harris, SpaceX vice president for legal, sent a letter

on Wednesday to the leaders of two congressional committees that

oversee the FAA, expanding on the company's objections and

asserting its commitment to safety.

"SpaceX forcefully rejects the FAA's assertion that it

violated any regulations," Harris wrote.

The FAA, Harris wrote, was failing to "keep pace with the

commercial spaceflight industry" and suggested the fine may be

the agency's response to increased congressional scrutiny of the

FAA's oversight of the commercial space industry.

SpaceX said it has been clear for some time the FAA's

commercial space office "lacks the resources to timely review

licensing materials" and "mistakenly focuses its limited

resources on areas unrelated to its public safety regulatory

scope."

Asked about the letter, the FAA said it "does not comment on

active enforcement issues."

In proposing the fines, the FAA said SpaceX failed to obtain

approval to revise the communications plan related to its

license for the June 2023 launch of a rocket carrying an

Indonesian telecommunication satellite. The agency said SpaceX

added a new launch control room without approval and removed a

mandatory phone call between the company, FAA and other launch

staff concerning pre-launch readiness procedures.

SpaceX said the FAA failed to review changes in a timely

manner before the launch even though the agency had advance

notice of six weeks, and added that the changes it made were

ones that did not require regulatory approval.

The FAA also said SpaceX used an unapproved network of

propellant tanks that send fuel to the rocket before the July

2023 launch of a communications satellite for the company

Echostar. SpaceX said the FAA subsequently approved the use of

this network of tanks for a subsequent launch and decided it

would not impact safety.

SpaceX has 30 days to formally respond to the FAA.

In February 2023, the FAA proposed a $175,000 civil penalty

against SpaceX for failing to submit some safety data to the

agency prior to an August 2022 launch of Starlink satellites.

The company paid that fine, according to the FAA.

In September 2023, the FAA completed an investigation into

SpaceX's April 2023 test launch of its giant Starship rocket,

requiring the company to implement dozens of corrective

measures.

Republican presidential candidate Donald Trump has said he

would establish a government efficiency commission headed by

Musk if he wins the Nov. 5 election. Musk has endorsed Trump.