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Search: Posts Made By: NSEU
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5th Apr 2019, 03:29
Replies: 5,129
Views: 10,225,563
Posted By NSEU

Wouldn't the accelerative forces apply to the...

Wouldn't the accelerative forces apply to the vane and the counter balance about the pivot point? So possibly no rotation due to equal forces up/down around the pivot point. I also recall the vanes...
5th Apr 2019, 03:13
Replies: 5,129
Views: 10,225,563
Posted By NSEU

The Maintenance Manual has upper and lower limits...

The Maintenance Manual has upper and lower limits when there are no airloads:

The torque required to turn the wheel is somewhere between 22 and 62pound-inches (2.5 and 7 newton-meters).

What's...
2nd Apr 2019, 01:23
Replies: 921
Views: 2,126,009
Posted By NSEU

Repeating theories does not make it so. I read...

Repeating theories does not make it so. I read your first post and I doubt you are familiar with the stabiliser ballscrew actuator assembly attachment points on a Boeing 767, the limits of travel of...
Forum: Tech Log
29th Mar 2019, 03:32
Replies: 6
Views: 1,575
Posted By NSEU

The stab trim electric motor is a 270 volt DC...

The stab trim electric motor is a 270 volt DC motor. However, the aircraft supplies 3 phase 115 volt AC power to the actuator assembly in the tail. Power is converted from AC to DC. The autopilot and...
27th Mar 2019, 22:45
Replies: 921
Views: 2,126,009
Posted By NSEU

There are also FSPM's (Flap/Slat Position...

There are also FSPM's (Flap/Slat Position Modules) providing data directly to the AFDS & TMS, including position, not just (flaps out of up, etc) discretes. The leading edge flap position indication...
27th Mar 2019, 00:31
Replies: 921
Views: 2,126,009
Posted By NSEU

The maintenance manual and my 767 engineering...

The maintenance manual and my 767 engineering training notes show no reference to the radio altimeters. Also, the logic for flaps and G/S capture is "or", not "and".

Most references show "flaps...
23rd Mar 2019, 04:44
Replies: 921
Views: 2,126,009
Posted By NSEU

Note that the split elevator system on the...

Note that the split elevator system on the 767-300 has a limit of 20 degrees between each side. There is a torque tube in the tail tying the two sides together, but there is an override mechanism on...
Forum: Tech Log
21st Mar 2019, 05:12
Replies: 9
Views: 1,529
Posted By NSEU

Where did you get -2.7PSI from? If the cabin is...

Where did you get -2.7PSI from? If the cabin is at 18000 feet and the airplane is at FL200, the differential pressure will be about 0.6~-0.7psi (cabin pressure greater than ambient).
(I have a...
Forum: Tech Log
20th Mar 2019, 01:04
Replies: 9
Views: 1,529
Posted By NSEU

The negative pressure relief valve was designed...

The negative pressure relief valve was designed for rapid descents, but Boeing words the manual carefully:



I assume they are designed for full gear/spoilers extended max airspeed rapid...
Forum: Tech Log
18th Mar 2019, 23:25
Replies: 9
Views: 1,529
Posted By NSEU

So you understand that the negative pressure...

So you understand that the negative pressure relief valves will not assist depressurisation in a pack off descent?



Pack leakage? I guess you could say it leaks 100% into the...
18th Mar 2019, 06:21
Replies: 16
Views: 9,335
Posted By NSEU

Or just load/unload the aircraft in the right...

Or just load/unload the aircraft in the right sequence. We used to use tailstands on 744 freighters for years until someone high up decided it was cheaper not to use them. Having seen an MD11 sit on...
13th Mar 2019, 00:49
Replies: 921
Views: 2,126,009
Posted By NSEU

Column deflection is an input into the B767 DFDR...

Column deflection is an input into the B767 DFDR (as well as control wheel and rudder pedal position).There are two position transducers on the ends of the torque tube (which runs between the control...
11th Mar 2019, 21:08
Replies: 921
Views: 2,126,009
Posted By NSEU

Seems a little low. I've revised my earlier...

Seems a little low. I've revised my earlier estimate downwards:

From 767-300 Maintenance Manual scale diagrams and the known maximum of dimension "A" (26.41 inches), ref AMM 27-41-18, the...
10th Mar 2019, 01:25
Replies: 921
Views: 2,126,009
Posted By NSEU

Let me add a little more information from the...

Let me add a little more information from the manual here:

0.00 units: ballnut is 0.5 inches from the top = stab leading edge up +2 degrees (full nose down trim with Alternate Trim?)
0.25 units:...
9th Mar 2019, 13:28
Replies: 921
Views: 2,126,009
Posted By NSEU

Are you overestimating the amount of travel the...

Are you overestimating the amount of travel the ballnut moves? I see about 6~8 inches of chrome above the ballnut (wild guess, not knowing the diameter of the screw). Subtract 1 inch to get the start...
9th Mar 2019, 05:21
Replies: 921
Views: 2,126,009
Posted By NSEU

I haven't spent much time in the forward...

I haven't spent much time in the forward stabilizer compartment, but your image seems to match the maintenance manual.

...
8th Mar 2019, 22:12
Replies: 921
Views: 2,126,009
Posted By NSEU

It depends on the individual aircraft. On some of...

It depends on the individual aircraft. On some of our old 767's, we used to have the Left ATC powered only by the 115Vac Left Main Bus and on the rest of the 767 fleet, it was powered by the 115Vac...
3rd Mar 2019, 23:19
Replies: 921
Views: 2,126,009
Posted By NSEU

It stops after it has been pulled from the water....

It stops after it has been pulled from the water. Even when I was young, I couldn't hear the ultrasonic pinging. We (maintenance engineers) had a special test box which converted the sound to audible...
25th Feb 2019, 23:19
Replies: 921
Views: 2,126,009
Posted By NSEU

Correct. The 767 only has one ballscrew. However,...

Correct. The 767 only has one ballscrew. However, it does use two hydraulic motors which drive the single ballscrew through a differential gearbox.
7th Nov 2018, 10:02
Replies: 2,098
Views: 1,098,084
Posted By NSEU

Seriously? Make an aircraft which defies the laws...

Seriously? Make an aircraft which defies the laws of physics and never breaks down? 3 independent pitot-static systems isn't enough?
Forum: Tech Log
15th Oct 2018, 22:30
Replies: 15
Views: 2,362
Posted By NSEU

Pilots don't disconnect the IDG for an engine...

Pilots don't disconnect the IDG for an engine fire. They only trip the generator fields (by pulling the fire handles).
Forum: Tech Log
5th Aug 2018, 14:46
Replies: 11
Views: 2,054
Posted By NSEU

The wing anti-ice should only operate in the air....

The wing anti-ice should only operate in the air.



Probably best not to use the term "modulate".... It only has two basic positions. Open or closed. Well, not including "in transit". No...
Forum: Tech Log
5th Aug 2018, 12:58
Replies: 11
Views: 2,054
Posted By NSEU

Since the APU Bleed Valve is motorised, it can...

Since the APU Bleed Valve is motorised, it can only close because of a loss of DC control power to the Isolation Valve relay R7745 ("AIR SUPPLY APU VALVE CONTROL).

DC control power goes through...
Forum: Tech Log
29th Jul 2018, 08:22
Replies: 21
Views: 3,589
Posted By NSEU

The AID delay compensates for length of antenna...

The AID delay compensates for length of antenna cables, antenna position, gear geometry and (typical) flare angle to ensure that the RA reads zero at the moment of touchdown.



Look at any...
Forum: Tech Log
27th Jun 2018, 10:19
Replies: 33
Views: 6,240
Posted By NSEU

I must be missing something here. How can you not...

I must be missing something here. How can you not mount a GoPro on a window without impeding vision of some part of the sky/aircraft?
Just how strong are these suction cups? Are they affected by...
Showing results 1 to 25 of 1000
 


 
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