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Search: Posts Made By: 737AvEng
Showing results 1 to 18 of 18
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Forum: Tech Log
2nd Apr 2009, 22:47
Replies: 44
Views: 29,101
Posted By 737AvEng

The FCC's do send some discretes to the A/T...

The FCC's do send some discretes to the A/T computer, but the A/T computer is independent in regards to using radio altitude. The A/T computer has both the left and right radio altimeter buses wired...
Forum: Tech Log
20th Mar 2009, 12:10
Replies: 4
Views: 4,243
Posted By 737AvEng

Are you talking about approach disconnect height?...

Are you talking about approach disconnect height?

The 737-700 and -800 AFM's I have looked at say:

Do not engage autopilot on takeoff below 400 feet AGL.

For single channel operation during...
Forum: Tech Log
19th Mar 2009, 13:48
Replies: 44
Views: 29,101
Posted By 737AvEng

It was there the whole time. I had only one radio...

It was there the whole time. I had only one radio altimeter test box, so I could not control both radio altimeters at the same time using different altitudes.

Here is the official wording straight...
Forum: Rumours & News
18th Mar 2009, 12:52
Replies: 2,906
Views: 1,447,983
Posted By 737AvEng

I've started a thread in the Tech Log forum in...

I've started a thread in the Tech Log forum in regards to the technical aspects of the 737NG radio altimeter/autothrottle/autopilot interface. I noted my observations while performing some tests.
...
Forum: Tech Log
18th Mar 2009, 12:48
Replies: 44
Views: 29,101
Posted By 737AvEng

737NG Radio Altimeter/Autothrottle/Autopilot Interface

I've started this thread to discuss only the technical aspects of the 737NG radio altimeter, autothrottle and autopilot interaction and operation. This is due to the Turkish Crash thread and BOAC's...
Forum: Rumours & News
9th Mar 2009, 12:38
Replies: 2,906
Views: 1,447,983
Posted By 737AvEng

I've actually read the whole thread, and what a...

I've actually read the whole thread, and what a thread it has been! I believe I posted this info and others have pointed out that the right radio alitimeter feeds FCC-B and that the left radio...
Forum: Rumours & News
9th Mar 2009, 00:53
Replies: 2,906
Views: 1,447,983
Posted By 737AvEng

What will be interesting to see is how fast the...

What will be interesting to see is how fast the speed bled down from Alpha to stick shaker. I need to research alpha a bit more as this is the only info I have on it:

The autopilot (A/P), flight...
Forum: Rumours & News
9th Mar 2009, 00:17
Replies: 2,906
Views: 1,447,983
Posted By 737AvEng

That is the old (Smiths Autothrottle) install...

That is the old (Smiths Autothrottle) install which has had both radio altimeters wired to it since inception on the first NG.

On the diagrams where you see with the #2 Rad Alt going to the right...
Forum: Rumours & News
8th Mar 2009, 22:14
Replies: 2,906
Views: 1,447,983
Posted By 737AvEng

Quoting Rananim: :ugh: I haven't been able...

Quoting Rananim:

:ugh: I haven't been able to find this info yet. Can you reference the section? I've looked at the differences between the Smiths Autothrottle Computer (which is what the accident...
Forum: Rumours & News
8th Mar 2009, 21:42
Replies: 2,906
Views: 1,447,983
Posted By 737AvEng

It is an option for the 737NG to be displayed on...

It is an option for the 737NG to be displayed on the PFD. It's controlled (on or off) by your CDS OPC software.
Forum: Rumours & News
8th Mar 2009, 21:36
Replies: 2,906
Views: 1,447,983
Posted By 737AvEng

737 AMM 22-11-00-146 (DFCS Functional...

737 AMM 22-11-00-146 (DFCS Functional Description)

Engage and Disengage Functions
24. The signal from the SMYD that shows a stall condition and activates the stick shaker must not be active.
...
Forum: Rumours & News
7th Mar 2009, 01:54
Replies: 2,906
Views: 1,447,983
Posted By 737AvEng

BOAC, I created a large post earlier today about...

BOAC, I created a large post earlier today about the MEL you posted. When I went to post, it said it needed to be reviewed by the moderators. Hopefully it will be posted.

I was posting the NG MEL...
Forum: Rumours & News
7th Mar 2009, 01:50
Replies: 2,906
Views: 1,447,983
Posted By 737AvEng

bubbers44 asked: If #1 RA sensed -8 ft for a...

bubbers44 asked:

If #1 RA sensed -8 ft for a while before glide slope intercept is it possible the retard and flair would not have happened until coupled on GS?

So far, there is no indication...
Forum: Rumours & News
7th Mar 2009, 00:12
Replies: 2,906
Views: 1,447,983
Posted By 737AvEng

BOAC, I'm still digging into autothrottle...

BOAC, I'm still digging into autothrottle operation with the right rad alt. The right rad alt output bus IS wired to the autothrottle (same bus wires feel FCC B).

In regards to the MEL you posted,...
Forum: Rumours & News
5th Mar 2009, 23:40
Replies: 2,906
Views: 1,447,983
Posted By 737AvEng

Flyinheavy posted: "It appears there was...

Flyinheavy posted:

"It appears there was more than an altimeter problem on the Turkish jet. Boeing said the autopilot system is designed so that if it senses faulty data from the captain's...
Forum: Rumours & News
4th Mar 2009, 17:43
Replies: 2,906
Views: 1,447,983
Posted By 737AvEng

At 50 RA' the automatic flare is initiated. ...

At 50 RA' the automatic flare is initiated. Could this have contributed to a stall ?

If the DFCS was only in CMD B, which is what has been stated so far, then FCC B would have not gone into the...
Forum: Rumours & News
4th Mar 2009, 17:38
Replies: 2,906
Views: 1,447,983
Posted By 737AvEng

BOAC - No worries, what's a few feet between...

BOAC - No worries, what's a few feet between friends? My intention was to point out that it appears that the logic in the autothrottle computer differs between single and dual channel A/P operation....
Forum: Rumours & News
4th Mar 2009, 17:09
Replies: 2,906
Views: 1,447,983
Posted By 737AvEng

BOAC : At 27' RA normally if A/T is engaged,...

BOAC : At 27' RA normally if A/T is engaged, single or dual channel. FLARE is a separate function and nothing to do with the A/Throttles.

That's not true. In Dual Channel, Flare Retard occurs at...
Showing results 1 to 18 of 18


 
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