buckeyefanflyer

I was on a 737 Max 9 Sunday FLL-CLE completely full aircraft was on the last flight of the night. It was a hot night I was sitting very last row took a while to deplane first they cut the air off which should not be done until deplaning is completed then the lights went out.
It was a great flight and crew thought this was not normal oractice

narvik

Never nice, but it happens.
Just had a MU flight into PKX arriving at a remote gate. For some reason they immediately shut the air off but made us wait for 30 minutes before opening the doors. 🥵

uanj

Was the flight late? Write in and complain nonetheless.

MU. I attempted to swear off taking them some years ago when a flight departing TAO in the summer was delayed six hours for air corridor disruption. Don't ask. We sat on the plane with no AC so the FAs opened the rear doors to get some air flow. If you got too hot they let you come back and stand next to the door for five minutes. Of course if you fell it was 8 meters to the ground. Fortunately nobody fell.

WineCountryUA

There is likely a standard time pause after landing for this to happen and a slow debaording process could lead to this. Not sure the FAs have a communication path to the ground crew, The pilots do but they have long departed many times.

LarryJ

The air must be shut off for three minutes (two minutes in the NG) before we can turn off the battery switch to secure the airplane for the night. That allows the APU to complete its cool-down cycle before shutting off.

The ground personnel should hook up PCAir but that doesn't always happen in a timely manner because they're unloading bags or some of them leave to park the next arrival and it's nice and cool on the ramp and they don't understand that it's not in the airplane.

ContinentalFan

Perhaps a pilot could comment, but I have noticed that the air circulation through the vents on the MAX8 and 9 is very weak: on the ground and even in the air. It�s also not always very cold. Is there something else going on with these MAX aircraft?

Repooc17

Did pilot and FO cut out early for the night?

No lights or air is the perfect time to get the party started I know the feeling of deplanning time from the rear of the plane, hey, those $50 in savings (BE ticket?) go on long way on party supplies and booze, or just get some from the back galley (latter) for free.

LarryJ

The volume of air entering the cabin is the same, just less of it is coming out of the overhead vents.

fumje

Interesting! Where is the rest going?

LarryJ

Most of the air enters through vents in the ceiling and along the side walls.

fumje

Hm, I think that balance is off, then. Is it adjustable at all, or it's fixed by Boeing?

ContinentalFan

Why is there such low flow? Is the system designed that way? The back of the MAX8 and MAX9 can get uncomfortable!

LarryJ

As far as I know, it is consistent across all of the airplanes with the space bins. Some have speculated that the Space Bins leave less room for the ducting to the PSU air vents but I don't know if that's true. It might also be related to the different design of the vent nozzle. Our manuals do not have any details about it. That would be in the maintenance manual. The airconditioning system itself is otherwise the same as the other airplanes.

lincolnjkc

I've noticed on the 737NG fleet (at least in rows 2-4 where I spend the majority of my time) the aircraft that have the "old style" cone gaspers are much more comfortable IMO and provide a more directed airflow than those with the newer "pancake" gaspers similar to those found on the 737MAX fleet -- part of that is I like to feel airflow and the new style seems to disperse it more broadly where the old style give more of a focused jet of air.

And clearly I'm spending way too much time on 737s to have developed strong feelings regarding the style of PSU/gaspers :-D

For the OP -- since CLE is a line maintenance station, given the APU cooldown requirements it's also possible that the Move Team was trying to get the aircraft secured and moved over to MX expediently as depending on whats on the dance card for the night they may need as much time as they can get to prepare for the mornings flights
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LarryJ

That is what I've found as well.

There are many people who don't like to feel the air movement, like we do, and they often don't understand the need to leave the air on, longer.

If the Move Team is taking the airplane, we'll generally leave the APU and air on as they use the APU to power the airplane during the tow.

At such stations, I'll check with the station before shutting it down to see if it is going to be moved soon.