United’s brand-new “Elevated” 787-9 has been grounded again, just days after returning from Boeing, and the reported is a serious one involving the Dreamliner’s Traffic Alert and Collision Avoidance System.
United’s Brand-New Premium 787 Grounded Again After Reported TCAS Problems
United Airlines’ first premium-heavy Boeing 787-9 Dreamliner with the new Polaris Studio suites is back out of service, only days after returning from Boeing maintenance.
This is aircraft N61101, the same 787-9 I wrote about last month after United sent it back to Boeing following a very troubled operational debut. At the time, I noted that a brand-new widebody does not get pulled from service and sent back to Boeing because a seat door sticks, a galley latch is loose, or the mood lighting is off.
But I did not name the reported system involved, because I was asked not to.
Now the issue has leaked publicly, and it can be discussed: the aircraft has reportedly been plagued by TCAS problems.
TCAS stands for Traffic Alert and Collision Avoidance System. It is the onboard system that helps aircraft detect other nearby aircraft and, when necessary, provides cockpit alerts and instructions intended to avoid a midair collision. In plain English, it is a very important system, and not one that an airline can casually ignore.
JonNYC, who has been tracking this issue closely, posted:
The aircraft was flown to Boeing’s facility in Moses Lake, Washington, where Boeing reportedly replaced both antennas feeding data into the TCAS system. The aircraft returned to United on June 30, flew a domestic roundtrip between San Francisco and Houston on July 2, then operated United flight UA930 from San Francisco to London Heathrow.
The next day, the return flight, UA939 from London to San Francisco, was canceled. United told passengers:
“Your flight is canceled because we needed to take the plane out of service to address a maintenance issue. Your safety is our priority, and we’re sorry for the inconvenience.”
Is this a problem that Boeing cannot fix?
This Is Not A Story To Scare Passengers, But It Is Serious
I do not want to sensationalize this. The aircraft was proactively taken out of service, which is exactly what should happen when there is a serious unresolved maintenance issue. United is not flying around with a known broken safety system and hoping for the best.
But it is also fair to say this is not a minor nuisance.
TCAS is not part a cabin feature or other hard product component like seats or lighting. If the reports are correct, this is a repeated problem with a core safety system on a brand-new aircraft that already went back to Boeing for attention and then failed again within days of returning to service.
It matters because this aircraft is supposed to represent the future of United’s longhaul product. N61101 was the launch aircraft for United’s new premium-heavy “Elevated” configuration, with 56 new Polaris suites, eight Polaris Studio seats, Premium Plus, and a much more premium cabin layout than United’s older 787-9s.
United intends this aircraft to be a flagship. Instead, at least so far, it has become a reliability headache.
Quality Control Issues Continue To Plague Boeing
This is also not a great look for Boeing.
To be fair, every new aircraft can have issues after delivery. Airlines expect some level of teething trouble, and a new premium cabin adds another layer of complexity. But repeated problems with a system as important as TCAS, if accurately reported, go well beyond the normal annoyance of a new seat not behaving properly.
United sent the aircraft back to Boeing. Boeing reportedly attempted a fix. The aircraft returned to service. Then it was grounded again.
That sequence is the problem.
I do not know whether this is a Boeing issue, a Charleston assembly line issue, a supplier issue, an installation issue, a software issue, or something else entirely. But this is Boeing’s aircraft, recently delivered, and it is reasonable to expect Boeing to get to the bottom of it quickly.
United has enough trouble introducing a new flagship product without its launch aircraft becoming a case study in premature celebration.
CONCLUSION
United’s brand-new premium-heavy Boeing 787-9, N61101, has been grounded again after reportedly suffering continued TCAS problems even after a visit to Boeing for maintenance.
This should not scare passengers away from United or the 787. The aircraft was pulled from service, and that is what a responsible airline should do when a serious maintenance issue arises. But this is a serious problem, not a minor cabin defect. TCAS is a critical safety system, and if the reported issue keeps recurring after Boeing already attempted a fix, United and Boeing need to fully resolve it before this aircraft returns to longhaul flying again (as I am sure United will do).
United’s new Elevated 787 may still become a flagship aircraft. Right now, though, its launch aircraft is becoming famous for the wrong reason…maybe United should re-consider that A350 order that has been mothballed for a decade?
Quit buying boeing trash and buy the A-330 and A-350
So there was a potentially dangerous plane out there but you, and other industry insiders made a decision to cover it up?
May I ask what was the reasoning for that decision? Because from the outside this reeks of coverup and people not wanting to risk their relationship with Boeing and United. And who asked you to not report it?
1.) Because it was taken out of service immediately and 2.) because the source was a leak and I don’t need the leaker getting into trouble – UA was asked and would not confirm.
Nixon would have loved you!
That type of loyalty is hard to find these days.
Nah, Trump and his cronies make Nixon and his look like saints.
According to Jon NYC, both antennas were replaced. In trying to understand this, there is something called multi-path propaganda that can occur when both systems are in use. What we don’t know is the precise nature of what was being alerted ( or not) to lead to antenna replacement. I have faith that between Boeing and the supplier, they will get to bottom of this mystery soon. I would love to be a fly on the wall at Moses.
The original issue with the SIN divert was due to galley ovens overheating.
If anyone tries to bring up shady unions, DEI hiring practices and poor workmanship, or media / blogger / influencer cover-ups to protect Boeing, I will be very, very upset. Because absolutely nothing like that is going on here. Almost certainly. Maybe a little bit. Actually, hmmm.
787s are built in non-union South Carolina, now. Previously, they were built in union shops in Washington, but all production has now gone to the non-union shops. The South Carolina shops have been plagued by poor construction reports, with serious quality control issues.
It’s pretty easy to see that this issue, while unfortunate, isn’t necessarily the tip of some larger iceberg.
AA has the essentially the same new interior as UA has on their own new 789 and hasn’t had this particular problem.
That, to me, highlights that this is something specific to this airframe, not a wider issue with either the interior or even the basic aircraft design.
Every manufacturer occasionally builds a lemon. It’s just unfortunate that this particular plane is a lemon.
For those interested, the 0.6-year-old UA B787-9 Dreamliner in question (N61101) is currently en route from LHR to SFO as Flight 3940… Probably a ferry flight.
Delivered on February 27, 2026 and entered into service on March 29, 2026, the hapless flagship aircraft represents UA’s premium-heavy future but has spent more time grounded and undergoing non-minor repairs than flying paying passengers. This is undoubtedly a very bad situation for both United and Boeing.
U ok hun?
You sound like a bot.