Search found 34 matches

by AirBoat
Wed Jun 12, 2019 2:11 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 382961

Re: Boeing 737MAX Grounded Worldwide Q2 2019

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.

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by AirBoat
Tue Jun 11, 2019 8:04 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 382961

Re: Boeing 737MAX Grounded Worldwide Q2 2019

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...

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by AirBoat
Tue Jun 11, 2019 7:03 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 382961

Re: Boeing 737MAX Grounded Worldwide Q2 2019

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...

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by AirBoat
Tue Jun 04, 2019 3:48 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 382961

Re: Boeing 737MAX Grounded Worldwide Q2 2019

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...

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by AirBoat
Mon Jun 03, 2019 1:55 pm
Forum: Travel, Polls & Preferences
Topic: Should Airports Stop Building for 380 sized Aircraft?
Replies: 56
Views: 7335

Re: Should Airports Stop Building for 380 sized Aircraft?

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...

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by AirBoat
Mon May 27, 2019 6:55 pm
Forum: Technical/Operations
Topic: Do the MAX 7 and 10 require MCAS?
Replies: 35
Views: 3849

Re: Do the MAX 7 and 10 require MCAS?

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...

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by AirBoat
Sat May 25, 2019 8:30 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 382961

Re: Boeing 737MAX Grounded Worldwide Q2 2019

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...

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by AirBoat
Mon May 20, 2019 2:55 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 382961

Re: Boeing 737MAX Grounded Worldwide Q2 2019

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...

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by AirBoat
Fri May 17, 2019 1:57 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 382961

Re: Boeing 737MAX Grounded Worldwide Q2 2019

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...

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by AirBoat
Mon May 13, 2019 10:09 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 382961

Re: Boeing 737MAX Grounded Worldwide Q2 2019

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...

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by AirBoat
Thu May 09, 2019 9:08 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 382961

Re: Boeing 737MAX Grounded Worldwide Q2 2019

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 ...

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by AirBoat
Mon Mar 11, 2019 4:54 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5474
Views: 716525

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

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 ...

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by AirBoat
Mon Mar 11, 2019 3:24 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5474
Views: 716525

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

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 ...

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by AirBoat
Tue Dec 19, 2017 4:48 pm
Forum: Civil Aviation
Topic: BA 380 stuck in JNB
Replies: 98
Views: 35123

Re: BA 380 stuck in JNB

thanks for that ( apologies for off topic)
have not been on board for a while. how do I upload an image.
I have a nice foto of the a380 at jnb, but can not figure out how to attach it.

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by AirBoat
Tue Dec 19, 2017 4:17 pm
Forum: Civil Aviation
Topic: BA 380 stuck in JNB
Replies: 98
Views: 35123

Re: BA 380 stuck in JNB

was on SA317 JNB-CT on 16 dec:
Saturday morning 16 dec there was a 787 parked next to the service hangar at cape town int airport. could not see the airline.
The BA A380 was parked at the service hangars opposite the domestic departures side of JNB airport

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by AirBoat
Tue Jan 03, 2017 9:39 pm
Forum: Technical/Operations
Topic: Can an Airplane be Painted With a Matte Look?
Replies: 29
Views: 6838

Re: Can an Airplane be Painted With a Matte Look?

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...

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by AirBoat
Thu Oct 13, 2016 8:15 pm
Forum: Technical/Operations
Topic: How Often Are Planes Weighed?
Replies: 18
Views: 5312

Re: How Often Are Planes Weighed?

How is this for margin...
A c130 was loaded kg instead of pounds and it still flew.....(2.2 x max load) this is from incident reports.

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by AirBoat
Sun Sep 18, 2016 9:22 am
Forum: Civil Aviation
Topic: Remote pax loading coming to SFO
Replies: 67
Views: 13262

Re: Remote pax loading coming to SFO

Remote pax unloading can be much quicker for the pax.
at cape town or jhb, the bus drops you at the baggage claim.
If the plane was at a docking station, you could have a very long walk to baggage claim. I would not call that a premium experience.

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by AirBoat
Sun May 22, 2016 7:20 pm
Forum: Civil Aviation
Topic: Egypt Air 804 Paris-Cairo Missing
Replies: 1187
Views: 72800

RE: Egypt Air 804 Paris-Cairo Missing Part 4

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?

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by AirBoat
Fri Sep 18, 2015 3:09 pm
Forum: Civil Aviation
Topic: Concorde 'could Fly Again'...
Replies: 120
Views: 28096

RE: Concorde 'could Fly Again'...

The Concorde at Manchester airport is in a hangar and in good condition.

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by AirBoat
Fri Sep 11, 2015 11:48 am
Forum: Civil Aviation
Topic: Malaga Airport Flooding
Replies: 13
Views: 7282

RE: Malaga Airport Flooding

That buss jet is going to have water in the wheel bearings, which can lead to seized up bearing down the line.

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by AirBoat
Thu Aug 06, 2015 5:00 pm
Forum: Travel, Polls & Preferences
Topic: Stupid People On Planes
Replies: 51
Views: 17314

RE: Stupid People On Planes

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...

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by AirBoat
Thu Jun 11, 2015 4:40 pm
Forum: Civil Aviation
Topic: Math Professor B777 Dive Claim
Replies: 23
Views: 14419

RE: Math Professor B777 Dive Claim

The paper does not claim the fuselage stays intact.
It clearly shows points of failure and explains various failure modes for the vertical dive.
Some high level engineering computational fluid dynamics effort went into this.

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by AirBoat
Mon Mar 30, 2015 3:40 pm
Forum: Civil Aviation
Topic: Germanwings A320 Crashed Enroute BCN-DUS - Part 14
Replies: 207
Views: 46342

RE: Germanwings A320 Crashed Enroute BCN-DUS - Part 14

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...

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by AirBoat
Fri Mar 13, 2015 4:25 pm
Forum: Civil Aviation
Topic: Runway Extension Results In Mud Slide At CRW
Replies: 19
Views: 9257

Runway Extension Results In Mud Slide At CRW

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...

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by AirBoat
Fri Jan 30, 2015 5:51 pm
Forum: Civil Aviation
Topic: Air Asia QZ8501 SUB To SIN Crash - Part 14
Replies: 207
Views: 35419

RE: Air Asia QZ8501 SUB To SIN Crash - Part 14

<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...

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by AirBoat
Fri Jan 30, 2015 1:28 pm
Forum: Civil Aviation
Topic: Air Asia QZ8501 SUB To SIN Crash - Part 14
Replies: 207
Views: 35419

RE: Air Asia QZ8501 SUB To SIN Crash - Part 14

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...

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by AirBoat
Mon Jan 26, 2015 6:47 pm
Forum: Civil Aviation
Topic: Air Asia QZ8501 SUB To SIN Crash - Part 13
Replies: 225
Views: 63734

RE: Air Asia QZ8501 SUB To SIN Crash - Part 13

If Aluminium has a density of say 4 times water.
then underwater the weight is only 3, due to the buoyancy effect of water.
But unfortunately , when you lift the thing out, the missing extra ton/m3 comes back to break your rope.

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by AirBoat
Sun Jan 25, 2015 2:56 pm
Forum: Civil Aviation
Topic: Air Asia QZ8501 SUB To SIN Crash - Part 13
Replies: 225
Views: 63734

RE: Air Asia QZ8501 SUB To SIN Crash - Part 13

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...

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by AirBoat
Sun Jan 25, 2015 2:25 pm
Forum: Civil Aviation
Topic: Air Asia QZ8501 SUB To SIN Crash - Part 13
Replies: 225
Views: 63734

RE: Air Asia QZ8501 SUB To SIN Crash - Part 13

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...

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by AirBoat
Sat Jan 24, 2015 12:16 pm
Forum: Civil Aviation
Topic: Air Asia QZ8501 SUB To SIN Crash - Part 13
Replies: 225
Views: 63734

RE: Air Asia QZ8501 SUB To SIN Crash - Part 13

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 ...

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by AirBoat
Fri Jan 23, 2015 11:04 pm
Forum: Civil Aviation
Topic: Air Asia QZ8501 SUB To SIN Crash - Part 12
Replies: 310
Views: 70041

RE: Air Asia QZ8501 SUB To SIN Crash - Part 12

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...

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by AirBoat
Mon Jan 19, 2015 4:41 pm
Forum: Civil Aviation
Topic: Air Asia QZ8501 SUB To SIN Crash - Part 11
Replies: 239
Views: 58713

RE: Air Asia QZ8501 SUB To SIN Crash - Part 11

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...

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by AirBoat
Sun Jan 18, 2015 5:12 pm
Forum: Civil Aviation
Topic: Air Asia QZ8501 SUB To SIN Crash - Part 11
Replies: 239
Views: 58713

RE: Air Asia QZ8501 SUB To SIN Crash - Part 11

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?

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