how about this idea.
the max needs extra training, but its the same as the ng
therefore ALL 737 pilots need extra training....
I am sure Boeing does not want to go there.
maybe the FAA is thinking about this, and is trying to find the best middle ground.
if its different, then re-certify.
Ok so possibly the aero wind tunnel model testing and the computer cfd modelling showed up an anomaly and they hoped for the best. From the above effects of MCAS one item that is being ignored is: it leads to increasing control forces ,i.e. it trims nose down and forces the elevator down as well and...Jump to post
Can anyone confirm when MCAS was implemented. I got the idea the light control forces were noticed during flight testing. This is a bit late in the day. It leaves only one option. A software fix. Any structural or aero fix would have taken years to do. As for the higher mounted engine causing more p...Jump to post
Control forces in the max are not directly related to aerodynamic forces. There is a FEEL system that provides stick forces decided on by the flight computer. The magnitude of the forces are affected by the systems such as mach trim , speed trim and possibly mcas. when MCAS needs to activate, the no...Jump to post
Johannesburg has 4 gates for A380 (I think) with double boarding ways. This can be used on any aircraft, like the LH 747-8 and speeds up boarding, so will definitely be a benefit to any airport. On domestic flights at JNB they use the one jet-way for the front and the back half pacs walk down the st...Jump to post
Can someone confirm the following: MCAS only operates approaching stall. therefore for the rest of the flight envelope it does nothing. Should it not be called 'Approaching stall help system' Then if it does nothing for the rest of the flight envelope, how can it make the plane feel the same as a NG...Jump to post
Note the sentence below: The FAA is reassessing the extent of force required to manually counteract nose-down commands in extreme circumstances, by turning a wheel—known as the trim wheel—located between the pilots. This is the hidden "approaching train smash" The utube video from the Amer...Jump to post
agree with above. I was taught to fly where trim is used to enable the plane to fly hands off, not to reduce forces. The 737 has software protection to prevent overstress of the elevators, which shows itself has higher control forces. The parts of the flight envelope where this happens should be poi...Jump to post
The 737 has hydraulically powered elevators. Why should the stick force become higher at high speeds? I searched and found an article on: Elevator Feel and Centring system. my take on this: its a system that increases the required force on the control stick at high speeds ( is this to limit any exce...Jump to post
The MCAS software update does not make sense. The logic of disabling MCAS if the two sensors disagree by more than 5 deg, assumes that the faulty sensor is the high value. What if the low value is the faulty one. You are then approaching the edge of your flight envelope with no protection.(According...Jump to post
my take on this: MCAS was put in to prevent a certain AOA value being exceeded, due to more powerful engines. (does anyone know this value, and what can the NG do?) When there is an AOA disagree MCAS is deactivated. Now there is no safe way to fly this aircraft as the pilots have no idea as to what ...Jump to post
being an eyewitness is an acquired or learned skill. as a structural engineer with a degree and close to 40 years experience, when I visit a building site, I can very quickly see most big errors. this is due to the fact that I have a frame of reference. i.e. I know what to expect and any missing or ...Jump to post
Is it possible to load a 737 max to aft of aft cg limits? It should not be possible. I was on a 737 800 with a delay due to luggage being offloaded and the LCG being recalculated. is this correct? If you are loaded tail heavy, the aircraft could fly ok with flaps out when the Longitudinal centre of ...Jump to post
the reason most aircraft are painted white is to keep the temperature down. A black aircraft will see a skin temperature of more than 100 deg c where as the white one will probably be above 30 deg c. having a black aircraft is burning money, in extra fuel burned for aircon. (these temps are obviousl...Jump to post
just a question?
I assume there are vents in the passenger cabin floor so that cabin pressure can equalize with the cargo hold to prevent a floor collapse when a cargo door opens in flight.
Does the cabin air con pressurize the cabin and then bleed through to the cargo hold?
Most dangerous for me is when the plane is about 20m or so from the gate and the pilot stops for a moment, and some idiots get up and reach for their bags in the overhead bins, and then the plane move again. These bozos then grab at anyone and anything to prevent taking a fall. This can lead to seri...Jump to post
In my company in South Africa, they can ask for a doctor's examination if they notice a pattern of excessive use of sick leave. The doctor then will only say, you are fit for work or unfit. The details remain confidential. I would think that its the same in Europe. It would take quite a number of si...Jump to post
To say the runway is not affected is being optimistic. At the edge of the overrun area the soil bank is more or less vertical. This bank is on the verge of collapse. A safe distance away from the edge, would roughly be a line starting from the bottom of the bank and rising at 30 degrees to the horiz...Jump to post
<table border="0" align="CENTER" width="95%" class="quote"><tr><td><font size="2" face="ARIAL, Helvetica, Geneva" color="#9A9DA0">Quoting <a href="/profile/Trin" class="quote" target="_blank">Trin</a> (<a href="#43" class="quote">Reply 43</a>):<br/><i>However, he was asserting the fact that a less-e...Jump to post
I don't think the fact that the co-pilot had less experience has anything to do with it. Both pilots were passed as fit to fly the aircraft, therefore even with very few hours any pilot should be able to handle any control situation. The bit about both ELAC's being switched off: according to the sch...Jump to post
Pihero,: thanks for all the useful input. Just a question? As a pilot, you have to maintain altitude in your airway but to what accuracy.? what I am getting at, can you reduce the forces on the aircraft by riding up and downdrafts or do you absolutely have to stick to your required altitude. Obvious...Jump to post
Quoting Pihero: reply 63: The increase in energy you stated is correct if taken relative to ground level.(which is not moving) The increase in energy will be the updraft acting on the airplane as an external force. but if you take as your reference frame the moving updraft air mass with the aircraft...Jump to post
My take on the different debris positions. Looking at the photos of debris brought up so far. the airplane hit the water slightly nose up and a bit left wing down in a pancake landing. Looking at forces at work here: the most mass is in the middle 2/3 of the fuselage. That means that the projecting ...Jump to post
Looking at the blue illustration of the track: It would be interesting to know what happened between points 2 and 3. From what I could read up, the data on the recorder is sampled a few times per second. The constantly reducing speed , whether the plane was going up or down, seems to indicate loss o...Jump to post
Thanks all for the interesting replies on what makes data recorders work. there seems to be 2 opinions here, break up when hitting sea, or in flight break up. the first has now been more or less confirmed. I would add the possibility of control surface damage when encountering bad weather , followed...Jump to post
First post here.
I have a question: do the data recorders stop working when power is lost or do they have on board batteries to keep them going?
the reason I ask is because if the aircraft lost power at some altitude, will the recorders keep going down to sea level?