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Search: Posts Made By: Graybeard
Showing results 1 to 35 of 36
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Forum: Tech Log
27th May 2011, 04:03
Replies: 2,546
Views: 935,413
Posted By Graybeard

Pitot Economy

We know how hard the airframes work to meet fuel economy and range guarantees they have made to their customers. Weight and power savings are paramount. It takes a lot of heat (fuel) to keep a pitot...
Forum: Tech Log
26th May 2011, 12:27
Replies: 2,546
Views: 935,413
Posted By Graybeard

Windshield Heat

OK, I apologize for the wrong way detour, comparing pitot icing to windshield icing. At some point I knew better.

Should I remove the errant posts, or just leave them?
Forum: Tech Log
26th May 2011, 05:23
Replies: 2,546
Views: 935,413
Posted By Graybeard

Machinbird: Very different devices, sure,...

Machinbird:

Very different devices, sure, but they're heated just enough to keep ice from accumulating. They're in the exact same icing, which is reportedly outside of certification...
Forum: Tech Log
26th May 2011, 04:00
Replies: 2,546
Views: 935,413
Posted By Graybeard

Hate to state the obvious, but how many...

Hate to state the obvious, but how many Boeing/Douglas/Lockheed airliners have suffered multiple pitot clogging from ice?

When the pitot get iced, I have seen no mention of windshield getting...
Forum: Tech Log
25th May 2011, 16:15
Replies: 2,546
Views: 935,413
Posted By Graybeard

Industry Activities

Arinc.com aviation has this:



For $250, you can buy your own copy of each year's report. You can bet that pitot have been discussed the last two years, especially.
Forum: Tech Log
25th May 2011, 16:06
Replies: 2,546
Views: 935,413
Posted By Graybeard

Icing Tests

Maybe one reason for not testing the pitot for icing at high altitude is the lack of an objective test. Airframe, and presumably pitot, icing testing is performed at lower altitudes by following a...
Forum: Tech Log
25th May 2011, 15:31
Replies: 2,546
Views: 935,413
Posted By Graybeard

from Aero Caraibe report: At 22:22:59, a very...

from Aero Caraibe report:
At 22:22:59, a very rapid decrease of CAS, of mach, and of altitude (correction of mach). The parameters changed respectively from 273KT to 85KT, MO.80 to MO.26 and...
Forum: Tech Log
25th May 2011, 12:53
Replies: 2,546
Views: 935,413
Posted By Graybeard

Agreed, Jig Peter. There are thousands of planes...

Agreed, Jig Peter. There are thousands of planes relying on pitot at this instant. Icing seems to be a rare event, and even more rare in non-Airbus.

Thanks to Sensor Validation for the OZ link,...
Forum: Tech Log
23rd May 2011, 15:21
Replies: 2,546
Views: 935,413
Posted By Graybeard

At the risk of taking this too far afield, I'll...

At the risk of taking this too far afield, I'll add the following about the AA DC-10.

I remember following the NTSB proceedings following the accident. A lot of discussion was on forklift...
Forum: Tech Log
23rd May 2011, 13:31
Replies: 2,546
Views: 935,413
Posted By Graybeard

Do you really know the fault logic of the ADIRU,...

Do you really know the fault logic of the ADIRU, Takata? You're saying that faulty airspeed is turns off all air data and AOA outputs from the ADR? I think you have confused ACARS report with...
Forum: Tech Log
22nd May 2011, 18:51
Replies: 2,546
Views: 935,413
Posted By Graybeard

Stall Recovery

The relevance to AF447 is toward the end:

1979 was a bad year for the DC-10, and it was almost worse.

May 25, KORD: Engine came off AA DC10-10; all fatal.

June-July: Entire DC10 fleet...
Forum: Tech Log
22nd May 2011, 16:15
Replies: 2,546
Views: 935,413
Posted By Graybeard

Yes, CB13, impact pressure at the Air Data Module...

Yes, CB13, impact pressure at the Air Data Module will drop to static level, zero airspeed, if the probe is blocked while the drain is open.

The drain hole is calibrated size with respect to...
Forum: Tech Log
22nd May 2011, 15:41
Replies: 2,546
Views: 935,413
Posted By Graybeard

Safety Concerns: Do we know how long the...

Safety Concerns:

Do we know how long the pitots were iced and in what manner before the A/P disconnected?
Forum: Tech Log
22nd May 2011, 15:18
Replies: 2,546
Views: 935,413
Posted By Graybeard

Pitot Static

Thank you, Takata for the diagrams and pages of info.

The info as presented tries to pack too much into a page, mixing pitot and static pressures together. AFAIK, all the prior events were...
Forum: Tech Log
22nd May 2011, 05:51
Replies: 2,546
Views: 935,413
Posted By Graybeard

The two TCAS antennas are above and below the...

The two TCAS antennas are above and below the forward cabin. They are about a foot long, half a foot wide, and about two inches tall.
Forum: Tech Log
22nd May 2011, 05:40
Replies: 2,546
Views: 935,413
Posted By Graybeard

TCAS Fail?

Thanks for the chart MM43.

Altitude is fed to the TCAS via the transponder. The transponder looks at only one altitude input at a time. Alternate altitude can be switched in. There is no airspeed...
Forum: Tech Log
20th May 2011, 20:06
Replies: 2,546
Views: 935,413
Posted By Graybeard

Thanks, Mods

This is to recognize and thank John Tullamarine and other Tech Mods for their patience in monitoring, and apparently culling so few posts. It was very frustrating to me in the first thread in R&N...
Forum: Tech Log
20th May 2011, 08:15
Replies: 2,546
Views: 935,413
Posted By Graybeard

Just for Comparison

I believe the 747-400 was the last new plane without FBW.

Can anybody visualize how it would have reacted with iced pitots in the approximate same coinditons as AF447?
Forum: Tech Log
19th May 2011, 05:25
Replies: 2,546
Views: 935,413
Posted By Graybeard

Once you are beyond basic handling skills, in...

Once you are beyond basic handling skills, in normal operation you find that the system in the plane that demands the most interpretive skills is the conventional Wx radar.
Forum: Tech Log
17th May 2011, 00:59
Replies: 2,546
Views: 935,413
Posted By Graybeard

Wx Radar Factor

Thanks for all the good comments.

It is not my opinion that the last generation of radars are unsafe, rather that the airlines give only lip service to radar training. UAL used to have an...
Forum: Tech Log
16th May 2011, 18:42
Replies: 2,546
Views: 935,413
Posted By Graybeard

WXR-2100

Rather than try to explain it, this is from Collins:

The Rockwell Collins MultiScanTM Hazard Detection System...
Forum: Tech Log
16th May 2011, 15:20
Replies: 2,546
Views: 935,413
Posted By Graybeard

Pitot Upgrade

I remember a post very early on here that the mechs at destination had received ACARS report of faulty airspeed on 447, and moved that plane to the front of the queue for getting the new pitot...
Forum: Tech Log
16th May 2011, 15:18
Replies: 2,546
Views: 935,413
Posted By Graybeard

Wx Radar: the tilt should have been pointed down...

Wx Radar: the tilt should have been pointed down into the wet part of the storm, moving the tilt up and down to see maximum return. The decision for avoidance route should have been made 80-100 miles...
Forum: Tech Log
5th May 2011, 12:37
Replies: 2,546
Views: 935,413
Posted By Graybeard

There sure seems a lack of urgency to transport...

There sure seems a lack of urgency to transport the recorders to where they can be read.
Forum: Tech Log
4th May 2011, 03:53
Replies: 2,546
Views: 935,413
Posted By Graybeard

Recorder Locations

1. The recorders are placed where they are least likely to be damaged in the typical crash. Of all the crashes in the jet age, only a handful have been into deep water.

2. The recorders may be...
Forum: Tech Log
1st May 2011, 17:58
Replies: 2,546
Views: 935,413
Posted By Graybeard

Great News!

Let's hope it is as intact on the inside as it appears on the outside.

http://www.bea.aero/fr/enquetes/vol.af.447/images/fdr2.reduite.jpg
GB
Forum: Tech Log
1st May 2011, 17:44
Replies: 2,546
Views: 935,413
Posted By Graybeard

Tongue Part Way in Cheek

from: Megalith Electronics
to: Mr. Pat Pendng

Dear Sir/Madam:

Thank you for your suggestion that we should buy your invention for Synchornous Anachronistic Wobbly Widget. However, we at...
Forum: Tech Log
30th Apr 2011, 00:36
Replies: 2,546
Views: 935,413
Posted By Graybeard

Black Box Locations

Just musing here. The A330 FDR is outside the pressure vessel, while on the 747 jurassic and other US planes that come to mind, both are inside. Seems from distant memory that the FDR on the BAe-146...
Forum: Tech Log
28th Apr 2011, 02:12
Replies: 2,546
Views: 935,413
Posted By Graybeard

777

Sorry, 777Fly. I meant, on the ramp, the 777 "looks like" a 737 on steroids. My post followed another along the same line.
Forum: Tech Log
27th Apr 2011, 23:15
Replies: 2,546
Views: 935,413
Posted By Graybeard

The 777 is a 737 on steroids.

The 777 is a 737 on steroids.
Forum: Tech Log
27th Apr 2011, 17:22
Replies: 2,546
Views: 935,413
Posted By Graybeard

re: HF slot antenna for the C130

Thanks for the link, RR. That same Brit ex-pat, Ben Hornby, consulted with the inventors of this antenna. It must have been his last project.

They have also built a slot antenna for the 747-1 and...
Forum: Tech Log
26th Apr 2011, 13:18
Replies: 2,546
Views: 935,413
Posted By Graybeard

HF Antennas

Modern HF antennas and couplers in commercial aircraft are quite different from those described above. By modern, I mean 1968 and newer.

All the modern airliners use current-fed notch/slot...
Forum: Tech Log
25th Apr 2011, 05:23
Replies: 2,546
Views: 935,413
Posted By Graybeard

RR_NDB: What basis do you have for that...

RR_NDB:

What basis do you have for that statement, Mac?
Forum: Tech Log
24th Apr 2011, 20:27
Replies: 2,546
Views: 935,413
Posted By Graybeard

Wx Radar Factor

RR_NDB


1 a) The Wx radar on 447 did not have auto tilt. They had the Collins WXR-700, not the newer WXR-2100.

b) As I explained in detail above, it was not possible for the major line to be...
Forum: Tech Log
24th Apr 2011, 18:39
Replies: 2,546
Views: 935,413
Posted By Graybeard

Pitot Probability

Back to the discussion of why the ACARS wasn't consulted first when the plane was overdue:

I remember reading early on that Maintenance in CDG noted the Airspeed fails reported by ACARS, and...
Showing results 1 to 35 of 36
 
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