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Search: Posts Made By: Old Ag
Showing results 1 to 35 of 40
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Forum: Accidents and Close Calls
29th Jan 2024, 22:38
Replies: 1,950
Views: 928,575
Posted By Old Ag

I don't recall stating that the plug could not be...

I don't recall stating that the plug could not be replaced with a door. I kind of remember stating that it is incorrect to state that the purpose of the plug was to allow for reconfiguration for use...
Forum: Accidents and Close Calls
29th Jan 2024, 20:02
Replies: 1,950
Views: 928,575
Posted By Old Ag

This is not correct. Boeing recommends the...

This is not correct. Boeing recommends the standard deactivated exit for customers who anticipate conversion to a configuration requiring an additional exit. In fact, as pointed out in Chris Brady’s...
Forum: Accidents and Close Calls
24th Jan 2024, 19:57
Replies: 1,950
Views: 928,575
Posted By Old Ag

I still stand by my post from the 8th:

I still stand by my post from the 8th:
Forum: Accidents and Close Calls
17th Jan 2024, 18:54
Replies: 1,950
Views: 928,575
Posted By Old Ag

Any idea what fault codes that would generate in...

Any idea what fault codes that would generate in the CPCs? I imagine that the fault codes were read out via BITE or by a download after the incident flights. Also the fault code that tripped the AUTO...
Forum: Accidents and Close Calls
16th Jan 2024, 15:07
Replies: 1,950
Views: 928,575
Posted By Old Ag

The auto pressurization system doesn't function...

The auto pressurization system doesn't function that way. If both controllers sensed an excessive cabin rate of climb (over 2000 ft/min) it would throw an auto fail without attempting to transfer to...
Forum: Accidents and Close Calls
16th Jan 2024, 10:23
Replies: 1,950
Views: 928,575
Posted By Old Ag

I haven't seen any one speak as to which...

I haven't seen any one speak as to which controller was throwing faults or even confirm it was the same controller throwing faults, although it stands to reason that it would be.
Forum: Accidents and Close Calls
16th Jan 2024, 02:08
Replies: 1,950
Views: 928,575
Posted By Old Ag

In terms of the pressure control system, the...

In terms of the pressure control system, the system that threw the warnings, that would throw an AUTO FAIL without ALTN because both automatic controllers would pick up the same issue so long as the...
Forum: Accidents and Close Calls
16th Jan 2024, 01:12
Replies: 1,950
Views: 928,575
Posted By Old Ag

So I wont be accused of overreaching and...

So I wont be accused of overreaching and parroting a parrot, here is an excerpt from NPR reporter Steve Inskeep's interview with the chair of the National Transportation Safety Board Jennifer Homendy...
Forum: Accidents and Close Calls
15th Jan 2024, 21:47
Replies: 1,950
Views: 928,575
Posted By Old Ag

The warnings were unrelated to an actual...

The warnings were unrelated to an actual pressurization problem. The warning was an "Auto Fail" warning with an "ALTN" annunciation light. This means there was an error in the primary pressurization...
Forum: Accidents and Close Calls
13th Jan 2024, 14:21
Replies: 1,950
Views: 928,575
Posted By Old Ag

Looking at the above photo, you can see the...

Looking at the above photo, you can see the handle attached to a round bar or torque tube that spans the door. On the side of the door, opposite the handle, you can see the bar pass through the door...
Forum: Accidents and Close Calls
13th Jan 2024, 10:25
Replies: 1,950
Views: 928,575
Posted By Old Ag

Does the lift assistance have to be built into...

Does the lift assistance have to be built into the hinge? Could it perhaps be built into the latching mechanism? Could the latching mechanism cam the door upwards with the help of springs integrated...
Forum: Accidents and Close Calls
13th Jan 2024, 01:43
Replies: 1,950
Views: 928,575
Posted By Old Ag

As I stated further on in the post you quoted,...

As I stated further on in the post you quoted, they probably though it a good idea that pulling the plug shut wouldn't risk the back of the stop pins being closed on the back of the stop pads. So...
Forum: Accidents and Close Calls
13th Jan 2024, 01:26
Replies: 1,950
Views: 928,575
Posted By Old Ag

Look at the hinge from the plug. Its shaped like...

Look at the hinge from the plug. Its shaped like a question mark. The end that is "C" shaped attaches to the floor of the plane. The other end has the spring and passes through the fitting in the...
Forum: Accidents and Close Calls
12th Jan 2024, 22:12
Replies: 1,950
Views: 928,575
Posted By Old Ag

Clearly the hinges differ between the plug and...

Clearly the hinges differ between the plug and the doors. The plug hinge is an intentional design not a reuse of the emergency exit door hinge design. I can’t see any spring in the hinge area of the...
Forum: Accidents and Close Calls
12th Jan 2024, 02:01
Replies: 1,950
Views: 928,575
Posted By Old Ag

What I mean under your point number 1 is: How...

What I mean under your point number 1 is: How much force is needed to hold the plug into the closed position without any stop bolts? If what you are saying is correct, if you pull the plug into the...
Forum: Accidents and Close Calls
12th Jan 2024, 01:15
Replies: 1,950
Views: 928,575
Posted By Old Ag

In an earlier post someone stated that the NTSB...

In an earlier post someone stated that the NTSB described the "Altn" light coming on during the pressurization events, this means the primary controller detected a a parameter that tripped a fault...
Forum: Accidents and Close Calls
12th Jan 2024, 00:30
Replies: 1,950
Views: 928,575
Posted By Old Ag

Unknown is how much upward force they exert on...

Unknown is how much upward force they exert on the plug when its in the closed position. Also unknown is how much of an interference fit there is between the stop pads and the adjustable pins in the...
Forum: Accidents and Close Calls
11th Jan 2024, 20:27
Replies: 1,950
Views: 928,575
Posted By Old Ag

Interesting that the bolts securing the rollers...

Interesting that the bolts securing the rollers to the frame were identified. Can that be done without opening the plug to access and see the rollers? Perhaps the act of QC ing the rollers lead to...
Forum: Accidents and Close Calls
11th Jan 2024, 07:39
Replies: 1,950
Views: 928,575
Posted By Old Ag

Haven't found anything other than the plug being...

Haven't found anything other than the plug being opened on the limiting cables. But if you look at the NTSB photos of the hinges protruding from the plane, they are both at about 90 degrees and...
Forum: Accidents and Close Calls
11th Jan 2024, 07:23
Replies: 1,950
Views: 928,575
Posted By Old Ag

Here is a 739 mid exit door in operation. I...

Here is a 739 mid exit door in operation. I imagine the Max door would be very similar. Maybe not fully 180 but close enough to have a risk of contact with the lower fuselage:
...
Forum: Accidents and Close Calls
11th Jan 2024, 06:55
Replies: 1,950
Views: 928,575
Posted By Old Ag

It does not appear to me that the plug and the...

It does not appear to me that the plug and the exit door share common hinges. The plug hinges only allow about 90 degrees of movement, while the exit door hinges allow almost 180 degrees. The plug...
Forum: Accidents and Close Calls
11th Jan 2024, 06:15
Replies: 1,950
Views: 928,575
Posted By Old Ag

It is doubtful that the springs are strong enough...

It is doubtful that the springs are strong enough to lift the plug up and out of the closed position on their own. Otherwise the plug couldn't be closed and stop bolts installed without keeping...
Forum: Accidents and Close Calls
11th Jan 2024, 05:38
Replies: 1,950
Views: 928,575
Posted By Old Ag

This may be semantics. Removing and reinstalling...

This may be semantics. Removing and reinstalling the plug may be different to Boeing than opening and closing it. Either way, QC is a Boeing responsibility.

Anyhow, I hope they get the inspection...
Forum: Accidents and Close Calls
10th Jan 2024, 13:06
Replies: 1,950
Views: 928,575
Posted By Old Ag

You are correct. My bad. It still stands that...

You are correct. My bad. It still stands that changing from a plug to any type of door is impractical according to Boeing.
Forum: Accidents and Close Calls
10th Jan 2024, 11:35
Replies: 1,950
Views: 928,575
Posted By Old Ag

Mid-Door Door Options

The plug door is one of a number of options for the mid exit on the Max9. The standard configuration is an inactivated exit door with no windows. Other options are type I, type II, type III and type...
Forum: Accidents and Close Calls
9th Jan 2024, 23:54
Replies: 1,950
Views: 928,575
Posted By Old Ag

I take it the 4 locking bolts and their hardware...

I take it the 4 locking bolts and their hardware still have not been located.

Has the NTSB checked lost and found at the Renton 737 final assembly line?
Forum: Accidents and Close Calls
9th Jan 2024, 01:08
Replies: 1,950
Views: 928,575
Posted By Old Ag

Likely it is the latter as the failure of one of...

Likely it is the latter as the failure of one of the slide assemblies by itself, would not let the door translate upwards and depart the aircraft. At worst, a failed slide would have the door pressed...
Forum: Accidents and Close Calls
8th Jan 2024, 22:38
Replies: 1,950
Views: 928,575
Posted By Old Ag

I will say this. If I were the NTSB and I were...

I will say this. If I were the NTSB and I were looking for the four bolts, I would start with the bin marked “Extra 737 Parts” at the FAL in Renton.
Forum: Accidents and Close Calls
8th Jan 2024, 22:21
Replies: 1,950
Views: 928,575
Posted By Old Ag

I don’t think the bolts, even without nuts could...

I don’t think the bolts, even without nuts could have all dropped out that quickly. They are more or less horizontal and probably a pretty tight fit. They also do not rotate or move at all. It just...
Forum: Accidents and Close Calls
8th Jan 2024, 22:13
Replies: 1,950
Views: 928,575
Posted By Old Ag

I don’t think there is too much friction from the...

I don’t think there is too much friction from the seal when there is no diff pressure. Boeing designed it to be easy to open when the four bolts were removed, thus the assist spring. I’ve heard less...
Forum: Accidents and Close Calls
8th Jan 2024, 22:06
Replies: 1,950
Views: 928,575
Posted By Old Ag

It looks like the upper guides and lower hinges...

It looks like the upper guides and lower hinges that guide it into position and hold it there once it is closed but not under pressure. Under pressure, it’s the lugs that take over holding the door...
Forum: Accidents and Close Calls
8th Jan 2024, 21:43
Replies: 1,950
Views: 928,575
Posted By Old Ag

I don’t think so. Their primary job is to hold...

I don’t think so. Their primary job is to hold the door on when it is open. When it is fully closed, it’s locked in all directions but up by the lugs that make it a plug design. When you translate it...
Forum: Accidents and Close Calls
8th Jan 2024, 21:38
Replies: 1,950
Views: 928,575
Posted By Old Ag

That is poor QC. But I believe the nut, bolt and...

That is poor QC. But I believe the nut, bolt and split pin in the middle of the photo are the issue with the accident plane. I believe it, and it’s three other friends were removed not re-installed. ...
Forum: Accidents and Close Calls
8th Jan 2024, 20:45
Replies: 1,950
Views: 928,575
Posted By Old Ag

My guess is that none of the bolts were installed...

My guess is that none of the bolts were installed sometime during or afree interior fit. If any of the bolts were installed, the door would not have been able to translate upward by the necessary 4cm...
Forum: Tech Log
29th Jan 2011, 11:22
Replies: 27
Views: 11,295
Posted By Old Ag

The breakthroughs for the large double row radial...

The breakthroughs for the large double row radial came around 1939 for P&W and 1941 for Wright. It was all slide rule and trial and error. For the R2800, P&W broke many engines on the test stands...
Showing results 1 to 35 of 40
 
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