We know from the FDR data that airspeed and altitude were correct. MCAS was going off due to bad AOA data. How do you come to this conclusion? The FDR data seems to show a 20-30 knot difference between left and right airspeeds. (Its difficult to tell because the scale is small). And, the pilots ask...
Jump to postUnderstood and agree in general However in case of 737, there is speed trim system(STS). From what I gathered, in normal operation, STS would trim against the normal direction the pilot would have wanted to trim. And the system operates non-continuous similar to MCAS. It blurres line between percep...
Jump to postI am wondering if the AoA vane change was done correctly. (or if there was a procedure not included in AMM). In the report on pages 7-9 the previous discrepancies and sign-offs are listed. Notice that before the vane change the discrepancy was always speed and altitude flags and no speed and altitud...
Jump to postSo what you are saying is that even after the power to the motor is killed by the pilots, their are manual trim wheels to mechanically turn the motor ? Ok thanks . Didnt know that. Here is an image of the acuator, jackscrew, etc. https://i.imgur.com/eIPESaX.jpg You see the cable drum, those cables ...
Jump to postThe pilots have the ability to cut off the power side if needed, they sit right next to the circuit breaker panels. Granted, I doubt many procedures besides electrical fire or shorts call for using breakers. The 115V goes though a normally open contact, remove the 28V from that is opens. The primar...
Jump to postThe cut off is only on the control side. Something called power cut off in my industry, would cut off power, not control only. The pilots have the ability to cut off the power side if needed, they sit right next to the circuit breaker panels. Granted, I doubt many procedures besides electrical fire...
Jump to postIMO I believe that something could have happened here that has never happened before, let us imagine the cut out switch did not cut the power to the trim motor. I don't think so. You can see in the FDR plots that computer inputs and the opposite direction pilot inputs to the trim motor, with corres...
Jump to postHopefully the CVR is found and we can find out what the pilots thought the flight control problem was. The preliminary report shows they communicated the aircraft was having a flight control problem to ATC three times.
Jump to postKICT wrote:dragon6172 wrote:SWA is adding Sat and Sun service to BNA and Sunday nonstop to SAN next summer.
Source? First I've heard of SAN-ORF n/s.
SWA is adding Sat and Sun service to BNA and Sunday nonstop to SAN next summer.
Jump to postOne thing I don't understand here is what happens if there are multiple inputs to trim system? The way AD goes, I don't quite understand what happens with the trim if there are multiple inputs. What happens if MCAS kicks in while yoke switches are used? MCAS seems to have a lot of authority, would ...
Jump to postIt is one of big sticking point here - with MCAS you cannot make things go your way before shutting off a few things. As for extras... I for MCAS to kick in, plane has to be flown manually - not on autopilot; loss of airspeed data seems to be the reason. You don't have to shut anything off to "...
Jump to postLDRA wrote:
Is there explicit indication in cockpit that MCAS is active or not. Based on description, MCAS can kick in and out, in and out...
From some other forums, a more detailed description of the system that is installed on the MAX that is probably the culprit MCAS (Maneuvering Characteristics Augmentation System) is implemented on the 737 MAX to enhance pitch characteristics with flaps UP and at elevated angles of attack. The MCAS f...
Jump to postThe SB says to use the electric trim switch, pull back on the column, or grab the trim wheel, then use the cutout if the behavior reoccurs. There's something else going on here, possibly confusion over stick shaker/pusher, maybe even split column movements breaking away the link. There is also the ...
Jump to postI believe it is the AoA indicator that is an option. If you don't have an AoA indicator, you don't need an AoA disagree caution. Well, in this case it seems that an AoA disagree message would have been very helpful for the maintenance guys when they was trying to diagnose the airplane after the pre...
Jump to postA vehicle's cruise control no longer receives valid speed information. The system responds by opening the throttle wide open because, hey, every driver should know how to use the break. Not a good example. Let's say the system responded by accelerating normally. A driver paying attention and not bu...
Jump to postAs a reminder. The bulletin literally said follow established procedures. You know so more people don't die. It is pretty standard after a crash for reminder bulletins to be sent. It is a "hey guys.. remember this thing... seems like you may have forgotten it... so remember it" You clearl...
Jump to postPilots know runaway stab trim and the procedures... Pilots know flight with unreliable airspeed and the procedures... But how many until yesterday, know how to deal with both unreliable airspeed and runaway stab trim at the same time. And let's not assume it's day VMC at the crash location just bec...
Jump to postmaint123 wrote:Too many people concentrating on how the pilots should have recovered from a faulty plane rather than what the fault was in a new plane.
1. In manual mode why still have a feature in which the auto trimming comes into play ?
I'm curious why the system would be allowed to cause "uncommanded horizontal stabilizer trim movement" when the data are known (or suspected) by the system to be erroneous. Would it not be safer to have the system reject the data, not cause uncommanded trim movements, and raise an alert t...
Jump to postNone of this discussion of trim problems explains the dive into the ocean. The problem showed on climb-out, they leveled at 5000 and flew there for 6-7 minutes, probably dealing with the problem judging by the altitude deviations. And then they just let go of the controls and let the plane fly itsel...
Jump to post737NG -- If the stab trim starts to go nose down, the first thing a pilot will instinctively do if flying manually (which is a requirement for this to happen) is pull back on the control column which will stop the runaway. Does that even apply to STS operation ? At acceleration altitude for exemple...
Jump to postThat's if you even have 10 seconds available.. Wow. Not sure I'll be on a MAX until a real solution is implemented imo. Same system is on NG's also. Better avoid them, too. :roll: And, looks like it is on 737 Classic's also. May as well avoid the whole type. So essentially you're saying it's unique...
Jump to postAnd, looks like it is on 737 Classic's also. May as well avoid the whole type. Trim actively controlled by AoA bypassing pilot input ? It doesn't bypass pilot input. If the pilot made a trim input it would stop automatically trimming. There is also a procedure to disconnect the electrical trim func...
Jump to postreported remedy: ... if not counteracted by pilot trimming the aircraft and disconnecting the stabilizer trim system. use the 10 sec intermission period. fix trim and then cut power . voila. That's if you even have 10 seconds available.. Wow. Not sure I'll be on a MAX until a real solution is imple...
Jump to postI find it strange that conditions for such an important malfunction have not occurred earlier, in test flying or in any of the hundreds of daily 737 MAX flights. It has come up on prior flights. The flight right before the accident flight actually. Those pilots were able to follow the procedure and...
Jump to postbenjjk wrote:Wow is correct.
This is the first I've heard of automatic AoA protection on a Boeing. Is it new to the Max? And is it as comprehensive as the Airbus logic?
- Initial FDR analysis will take 1-2 weeks. - CVR pings are reported to be "in and out" through this afternoon's search dives. One thing puzzles me. This plane was produced this year 2018. Type certificate is little older. Still: The memory chips for the FDR and CVR seem to be contained i...
Jump to postI maybe wrong but I think prebennorholm is on to something here. Back in the old days, the bulky nature of the recording device meant that the FDR and CVR had to be housed in two separate boxes. With the level of miniaturization we see today using electronics and memory chips, it should be possible...
Jump to postFrom Sky News Twitter account, just now: 'Investigators say the "black box" flight recorder recovered after a plane crash in Indonesia shows four of the Lion Air jet's flights had experienced problems with the airspeed indicator' https://twitter.com/SkyNewsBreak/status/1059387680734306305...
Jump to postApparently he may have tried to open the door?
I looked through flightradar24 data on several flight tracks that used the same departure from CGK. Everyone flew the runway heading to an altitude of ~3200 feet and then began the left hand turn. The incident aircraft climbed to ~1600 feet and started its turn. Could have been an early turn instruc...
Jump to postfrmrCapCadet wrote:Eye witnesses are important in any investigation. They are often accurate.
Pardon me if this has come up in the previous posts, I haven‘t read all of them: Flightradar24 data only relies on Mode-S and ADS-B data, meaning the GS and ALT information come from within the aircraft. I don‘t know the technicals behind the 737, but I am almost certain that if the CM1 instruments...
Jump to postDid they only screw up the spelling on one side?
Jump to postIs there an actuator associated with this door? Just linkages connected to the gear leg? Or just a rub strip?
Jump to postI read that it was 11 aircraft being modified. Also, they did move from the A to the C model Hornet at some point. So this will be the 3rd Hornet type the Blues have flown
Jump to postAnd this is a surprise to no one. WN has skirted rules and had cozy realtionship with the FAA people that were supposed to safeguarding the public. It was only a matter of time. Perhaps peeling the onion will reveal a lot more. Maybe the inspectors doing the deep dive don’t like pizza? (An industry...
Jump to postSo real quick back to the smoking tires/brakes. I know this was touched on, but those with experience in this type of aircraft, do you think he was rolling with partial brakes applied and was causing the brakes to smoke? You would think it would take a little longer to get the brakes warm enough to...
Jump to postI'm not entirely up-to-date on the helo developments and such, but I thought everything from here-out would revolve around the Future Vertical Lift (FVL) aircraft. I guess the 22 is larger than the valor and no other replacement exists yet in that size/capacity. Don't get me wrong, I like the Ospre...
Jump to postI don't see a need to change. I can't seem to ever find an answer to this question: Is it going to be based off the pax (stretched upper deck) or cargo version of the 747-8? I believe they are pax versions. They are using airframes originally built for a Russian airline Transaero. They were built b...
Jump to postThey cannot, the posse comitatus act does not allow the regular Army to intervene at all domestically. The National Guard and the Air National Guard are the only ones who can operate when civilians are involved on US soil. Even during 9/11, most of the fighters launcheed were from the ANG, save a f...
Jump to postrlwynn wrote:I just watched a you tube Video of Obama flying in an Osprey in Iraq.
This aircraft had one of the most challenging introductions to service of any program I can recall. Does anyone know the reliability and in service stats for the Osprey over the past few years? I have to assume they've ironed out the major problems to get an order like this. Still a maintenance nig...
Jump to postCompared to auto tires, the tread pattern on aircraft tires seem overly simple. Why didn't aircraft tires develop with more complex tread patterns? They did back when..... https://c2.staticflickr.com/6/5253/5457566512_f5f99788b0_b.jpg https://www.worldwarphotos.info/wp-content/gallery/usa/aircrafts...
Jump to postThe page on southwest.com regarding traveling with infants and toddlers says a birth certificate is required in three or four different spots. Seems pretty clear to me. Also no mention of any other form of ID on this page. On the "Age Verification" page it says travelers on age restricted ...
Jump to postI had this on a truck and it was just and out of balance wheel. I assume the tires were balanced when you had them replaced though. Do your front tires show any signs of odd wear? Does the vehicle track straight when you let you hand off the wheel on level pavement? Also. When you say front end shak...
Jump to postI totally think players should be allowed to kneel during the anthem. The teams should also be able to fine them. What's interesting to me is that this new policy announcement from the NFL has no negative effect on the players.... yet. It says: ⋅ The policy is that team and league personn...
Jump to postIf you want to get rid of the anthem before games, that's fine with me. You weren't watching anyway. Nobody ever showed the anthem on TV because it was a good time to run some commercials (how's that for respect for the flag?). So what you're really objecting to is the knowledge that someone was kn...
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