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Search: Posts Made By: JRBarrett
Showing results 1 to 35 of 71
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Forum: Accidents and Close Calls
12th Mar 2024, 21:25
Replies: 57
Views: 18,235
Posted By JRBarrett

No it did not. Pictures have been published of...

No it did not. Pictures have been published of the axel of the incident aircraft after it landed at KLAX. See post number 47 just above.The axel nut and its locking bolts are still intact and...
Forum: Accidents and Close Calls
15th Feb 2024, 13:18
Replies: 195
Views: 85,380
Posted By JRBarrett

That is likely. SOP for a Challenger is to start...

That is likely. SOP for a Challenger is to start the APU during descent (usually below 10,000 feet), and transfer the bleed air for the packs from the engine 10th stage to the APU bleed air. The APU...
Forum: Accidents and Close Calls
8th Feb 2024, 13:51
Replies: 1,950
Views: 927,935
Posted By JRBarrett

The springs may exactly counterbalance the weight...

The springs may exactly counterbalance the weight of the door so that they exert no relative “lift” force - but would make it easy for one person to move the door upwards by applying a relatively low...
Forum: Accidents and Close Calls
24th Jan 2024, 12:20
Replies: 1,950
Views: 927,935
Posted By JRBarrett

I work in maintenance at a corporate flight...

I work in maintenance at a corporate flight department, and this is exactly how we do it. A 24-month inspection requires removing multiple panels on the wing and fuselage, and the fasteners (screws)...
Forum: Rumours & News
11th Jun 2023, 21:09
Replies: 117
Views: 45,986
Posted By JRBarrett

Not much at altitude. Even so, with a full ACM...

Not much at altitude. Even so, with a full ACM that can cool the air using a compressor driving an expansion turbine, there can be a significant amount of water that condenses at the outlet of the...
Forum: Rumours & News
10th Jun 2023, 22:38
Replies: 117
Views: 45,986
Posted By JRBarrett

I think Dan Gryder is off the mark on this. “He...

I think Dan Gryder is off the mark on this. “He doesn’t know what he doesn’t know.”

I’m not a pilot, but am a mechanic, with many year’s experience working on air conditioning and pressurization...
Forum: Rumours & News
7th Sep 2019, 17:10
Replies: 46
Views: 55,336
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, 03:18
Replies: 146
Views: 70,248
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...
Forum: Rumours & News
30th Mar 2019, 13:27
Replies: 5,109
Views: 13,099,485
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...
Forum: Rumours & News
28th Mar 2019, 04:03
Replies: 5,109
Views: 13,099,485
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...
Forum: Rumours & News
24th Mar 2019, 16:19
Replies: 908
Views: 1,093,585
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...
Forum: Rumours & News
24th Mar 2019, 15:58
Replies: 5,109
Views: 13,099,485
Posted By JRBarrett

I would certainly hope so. I don’t know if Boeing...

I would certainly hope so. I don’t 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...
Forum: Rumours & News
24th Mar 2019, 14:15
Replies: 5,109
Views: 13,099,485
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...
Forum: Rumours & News
23rd Mar 2019, 14:12
Replies: 5,109
Views: 13,099,485
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...
Forum: Rumours & News
22nd Mar 2019, 15:04
Replies: 5,109
Views: 13,099,485
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,...
Forum: Rumours & News
23rd Nov 2018, 23:17
Replies: 2,099
Views: 1,465,904
Posted By JRBarrett

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

As would mine...

Which raises the question: “What post-replacement functional checks are called for (in the AMM), and what functional tests were actually performed after the replacement probe was...
Forum: Rumours & News
13th Nov 2018, 13:35
Replies: 2,099
Views: 1,465,904
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...
Forum: Engineers & Technicians
30th Dec 2017, 00:45
Replies: 8
Views: 5,147
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, 00:44
Replies: 21
Views: 7,920
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
17th Dec 2017, 23:04
Replies: 21
Views: 7,920
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...
Forum: Spectators Balcony (Spotters Corner)
1st Oct 2017, 20:09
Replies: 559
Views: 590,079
Posted By JRBarrett

As does the BR710/715

As does the BR710/715
Forum: Biz Jets, Ag Flying, GA etc.
30th Sep 2017, 20:21
Replies: 7
Views: 3,420
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, 15:33
Replies: 52
Views: 30,784
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...
Forum: Engineers & Technicians
11th Aug 2016, 16:34
Replies: 10
Views: 8,812
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...
Forum: Biz Jets, Ag Flying, GA etc.
20th Apr 2016, 14:19
Replies: 5
Views: 3,574
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...
Forum: Biz Jets, Ag Flying, GA etc.
19th Apr 2016, 14:22
Replies: 5
Views: 3,574
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, 15:38
Replies: 15
Views: 5,445
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...
Forum: Rumours & News
8th Aug 2015, 22:24
Replies: 32
Views: 28,790
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....
Forum: Biz Jets, Ag Flying, GA etc.
31st Oct 2014, 02:01
Replies: 17
Views: 5,988
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...
Forum: Biz Jets, Ag Flying, GA etc.
30th Oct 2014, 21:59
Replies: 17
Views: 5,988
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
14th Jul 2014, 23:40
Replies: 23
Views: 7,478
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...
Forum: Biz Jets, Ag Flying, GA etc.
25th Jun 2014, 01:42
Replies: 248
Views: 117,996
Posted By JRBarrett

The GIV only has a single electrically-driven...

The GIV only has a single electrically-driven hydraulic pump - the "aux pump". On the ground, it is not capable of supplying hydraulic pressure to any of the primary flight controls affected by the...
Forum: Biz Jets, Ag Flying, GA etc.
16th Jun 2014, 02:57
Replies: 248
Views: 117,996
Posted By JRBarrett

That possibility has crossed my mind. However,...

That possibility has crossed my mind. However, during my initial maintenance training on the G-IV many years ago, we were told that the hydraulic actuators are capable of producing more than enough...
Forum: Biz Jets, Ag Flying, GA etc.
16th Jun 2014, 02:29
Replies: 248
Views: 117,996
Posted By JRBarrett

Although the cockpit section of the airframe...

Although the cockpit section of the airframe appeared relatively intact in the post-crash photos, hard to say how much structural damage occurred inside, or how severe the deceleration forces were....
Forum: Biz Jets, Ag Flying, GA etc.
14th Jun 2014, 17:59
Replies: 248
Views: 117,996
Posted By JRBarrett

It's not quite as complicated as that, there is...

It's not quite as complicated as that, there is no mechanical or hydraulic "separation" of the yoke from the elevator. Pulling the control lock lever upward merely causes a latching pin to slide into...
Showing results 1 to 35 of 71
 
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