I know it’s been 7 years since the grounding of 737 max but why was all variant grounded (I believe all variants was grounded) and not just the Max 8 which is on the accident flight?
Isn’t it rather obvious? 
They all had the same software flaw.
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So far I think only the MAX 7 has been certified.
Yes I understand that. But I mean if the flaw was the reason for the crash of the two Max 8, why didn’t any Max 7 crash as a result of MCAS unlike Max 8?
That means MAX8’s and MAX9’s are flying illegaly. Doesn’t seem so
The max 7 just got certified and they fixed the flaw some time ago, plus the max 9 (if it existed back then) just happened to not crash I guess
The 737-7, -8, and -9 all hold an FAA type certification—with the 737-10 being the last remaining uncertified variant.
As for OP’s question, the MCAS system is present on all 737 Max variants. Only the 737-8 and -9 were in service at the time of the crashes and subsequent grounding. The delay to the 737-7 and -10 is due to the engine anti-ice issue which has now been approved, and will be retrofitted to already produced and new build 737 Max.
Did FAA really ground Max 7 because of MCAS?
The FAA did not ground the 737-7 as it was not approved for commercial service at the time of the grounding. The 737-7 was a key tool in the recertification of the updated flight software, though.
Look at the number of 737 MAX 8 in the air at the time, compared to the MAX 9 which was in service at the time.
There were 350+ 737 MAX 8 flying at the time, in comparison to the 737 MAX 9.
Funny I always thought Max 7 was in service back in 2019. I didn’t know Max 7 was delayed, wonder why Max 8 enter service before Max 7?
Quick google search always helps..
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The 737 MAX 7 was certified literally hours ago
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