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Search: Posts Made By: JRBarrett
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7th Sep 2019, 18:10
Replies: 39
Views: 31,868
Posted By JRBarrett

If a pitot tube is completely blocked on the...

If a pitot tube is completely blocked on the ground, and the barometric pressure falls substantially from what it was at the time the blockage occurred, the trapped pressure (compared to the still...
Forum: Tech Log
3rd Apr 2019, 04:18
Replies: 146
Views: 46,342
Posted By JRBarrett

As an AME, I have never had occasion to...

As an AME, I have never had occasion to disassemble an AOA vane, though I have replaced entire AOA sensors. Almost always due to a failure of the heater circuit.

I have replaced RVDT sensors of...
30th Mar 2019, 14:27
Replies: 5,127
Views: 10,324,357
Posted By JRBarrett

There is nothing in that report to indicate there...

There is nothing in that report to indicate there was an AOA problem, specifically. The symptoms sound more like a failure of the ADIRU itself. If the air data portion of the ADIRU failed, it would...
28th Mar 2019, 05:03
Replies: 5,127
Views: 10,324,357
Posted By JRBarrett

AOA sensors are standard on almost every...

AOA sensors are standard on almost every transport category aircraft. They are the primary sensor for the stall warning system (along with indicated airspeed), and may (or may not, depending on...
24th Mar 2019, 17:19
Replies: 908
Views: 951,685
Posted By JRBarrett

On the ground, the AOA vanes are likely to be in...

On the ground, the AOA vanes are likely to be in random positions, and can certainly move anywhere from full up to full down if the winds are gusty. As you point out, AOA sensor data is ignored by...
24th Mar 2019, 16:58
Replies: 5,127
Views: 10,324,357
Posted By JRBarrett

I would certainly hope so. I donít know if Boeing...

I would certainly hope so. I donít know if Boeing has been provided with any of the FDR data from the Ethiopian flight as of yet which might show a similar AOA error as experienced in the first...
24th Mar 2019, 15:15
Replies: 5,127
Views: 10,324,357
Posted By JRBarrett

It may not be a case where the Arinc 429 data...

It may not be a case where the Arinc 429 data label is being corrupted in transit (which would be detected by the CRC check). More likely that the A/D converter that receives the analog AC voltage...
23rd Mar 2019, 15:12
Replies: 5,127
Views: 10,324,357
Posted By JRBarrett

Internal sensors can measure pitch angle and...

Internal sensors can measure pitch angle and acceleration, but that would be of no use for AOA. The AOA sensor measures the angle between the relative wind and the fuselage, and that can only be...
22nd Mar 2019, 16:04
Replies: 5,127
Views: 10,324,357
Posted By JRBarrett

I am at a loss to understand how Boeing engineers...

I am at a loss to understand how Boeing engineers could not/did not foresee the dangers in their original implementation of MCAS. Any aircraft manufacturer is certainly aware that sensors can fail,...
24th Nov 2018, 00:17
Replies: 2,100
Views: 1,147,279
Posted By JRBarrett

As would mine... Which raises the question:...

As would mine...

Which raises the question: ďWhat post-replacement functional checks are called for (in the AMM), and what functional tests were actually performed after the replacement probe was...
13th Nov 2018, 14:35
Replies: 2,100
Views: 1,147,279
Posted By JRBarrett

I am an avionics maintenance engineer. I have not...

I am an avionics maintenance engineer. I have not worked on any model of the 737, but am very familiar with AOA systems on a variety of other transport category aircraft.

If the probe dropped...
30th Dec 2017, 01:45
Replies: 8
Views: 4,113
Posted By JRBarrett

If the aircraft is using an Inmarsat SATCOM...

If the aircraft is using an Inmarsat SATCOM datalink for transmitting engineering data to company maintenance operations, the IRUs need to be on and aligned. This is necessary in order for the...
Forum: North America
18th Dec 2017, 01:44
Replies: 21
Views: 6,605
Posted By JRBarrett

Airports typically have fast transfer backup...

Airports typically have fast transfer backup generation for all safety-critical functions - ATC facilities, runway lighting, navaids etc. Terminal facilities may not be on that system - especially a...
Forum: North America
18th Dec 2017, 00:04
Replies: 21
Views: 6,605
Posted By JRBarrett

International arrivals destined for ATL are...

International arrivals destined for ATL are diverting wherever they can. At 23:55 Z Turkish 31K from IST on approach to Dulles - Delta 26 from ICN appears to be descending for Detroit etc...
1st Oct 2017, 21:09
Replies: 554
Views: 530,750
Posted By JRBarrett

As does the BR710/715

As does the BR710/715
30th Sep 2017, 21:21
Replies: 7
Views: 2,352
Posted By JRBarrett

Not a pilot, but I have maintained both G200s and...

Not a pilot, but I have maintained both G200s and Legacy 600s. The G200 is not bad maintenance-wise, but there are some weaknesses. The airframe itself is easy to work on. The Fadec-equipped Pratt...
Forum: Tech Log
1st Apr 2017, 16:33
Replies: 52
Views: 17,864
Posted By JRBarrett

As others have mentioned, you should have the...

As others have mentioned, you should have the battery removed and capacity tested by a qualified shop. I assume the Meridian has a lead-acid battery. These do have a finite service life, and if it...
11th Aug 2016, 17:34
Replies: 10
Views: 6,207
Posted By JRBarrett

Several years ago, we had a Citation 550 in our...

Several years ago, we had a Citation 550 in our fleet that experienced a complete loss of COM radio functionality whenever flying in visible moisture. (Especially snow). A loud hissing noise was...
20th Apr 2016, 15:19
Replies: 5
Views: 2,999
Posted By JRBarrett

It is not a good design. The release levers are...

It is not a good design. The release levers are in the form of a "trigger", designed to be pulled upwards by the index fingers. If one were to rest one's hand on top of the throttle knobs, the index...
19th Apr 2016, 15:22
Replies: 5
Views: 2,999
Posted By JRBarrett

I am a mechanic, and maintained a Premiere for...

I am a mechanic, and maintained a Premiere for several years for a 135 operator.

The throttles have levers that must be lifted to pull them down into the cut-off position. They are in a position...
Forum: Tech Log
26th Sep 2015, 16:38
Replies: 15
Views: 5,057
Posted By JRBarrett

I do avionics maintenance for a corporate flight...

I do avionics maintenance for a corporate flight department. One of our pilots had this same issue with a Bose ANR headset. In testing, I found that the noise would vary in intensity with head...
8th Aug 2015, 23:24
Replies: 32
Views: 23,289
Posted By JRBarrett

At least some of the news reports indicated that...

At least some of the news reports indicated that the aircraft "flew through" a thunderstorm, but looking at at the Flightaware track of this flight, it appears they did not fly through any cells....
31st Oct 2014, 03:01
Replies: 17
Views: 5,652
Posted By JRBarrett

The argument could certainly be made that they...

The argument could certainly be made that they were at fault for doing an inadequate pre-flight walk around. The squat switch is mounted right on the front of the main gear legs, and the sticks...
30th Oct 2014, 22:59
Replies: 17
Views: 5,652
Posted By JRBarrett

Sticks are definitely not the proper or approved...

Sticks are definitely not the proper or approved method to put the switches in ground mode. Ever since that incident, every G2-GV Gulfstream maintenance manual carries a large caution message to the...
Forum: Tech Log
15th Jul 2014, 00:40
Replies: 23
Views: 5,230
Posted By JRBarrett

Reading the full description of the YouTube...

Reading the full description of the YouTube video, it was an L1011 belonging to an aviation museum, and they were doing engine runs in preparation for flying the aircraft to a new location.

It...
Showing results 1 to 25 of 65
 


 
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