onetrack
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Posts posted by onetrack
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I'm going out on a limb here, and hazarding a mildly educated guess. The pilot is an ex-IAF fighter pilot. Not a real good choice to convert to an ATPL holder.
He's been taught to respond fast, and with maximum control deflections, to throw his fighter out of harms way from incoming missiles and ground fire. These blokes are noted for their heavy-handed inputs on aircraft controls.
I see a similarity to the American Airlines 587 crash here, where heavy-footed rudder inputs by the co-pilot, tore the vertical stabiliser off the Airbus. The pilots claimed they weren't taught to go easy on the rudder inputs.
This B737-500 is nearly 27 yrs old. It's been through several owners. It's done a huge amount of short trips in Indonesia, from island to island, resulting in high cycle times. The airframe total hrs would be pretty high.
I see a situation where a fighter-trained pilot at the controls, got pretty heavy-handed with the control inputs, in a high-hour, high-cycle-time B737, trying to avoid a storm cell, or lightning - at a speed that was possibly over maximum Va or Vb.
The result was catastrophic airframe failure, or major control component failure, that led to an immediate, uncontrollable dive into the Java Sea. This is pure conjecture, I await the examination of the CVR and FDR with interest.
The uncontained engine failure is also a potential event causing the crash. But these turbines are exceptionally reliable, and unless the last engine repair was done by the Indonesians, I'd have to opine it's a low possibility.
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The passenger and crew list have been released. They all appear to be Indonesians.
The Captain, who goes by only one name, as in the common Indonesian custom, is Captain Afwan. He is a former IAF pilot. There appears to be no public record available of his career.
Captain Afwan appears in photos regularly as a very devout Muslim. He does not appear to have any LinkedIn account - but there's a news media report, with photos of him.
His co-pilot was named as Senior F.O. Diego Mamahit. His LinkedIn account lists his total flying hours as 4800.
https://id.linkedin.com/in/diego-mamahit-75a39748?challengeId=AQEU6ZT9mCMwhwAAAXbr2TV-rk-Cgufpqby4m7H1dEnztgXFjbFLzTRdvczjQuzBkEU0WTQ7wQlJ2YTjTWoKIWreTgda8s_zTA&submissionId=5469b90d-43d8-5816-17fa-a8b4369ebb1d (click the spiral galaxy photo to get past the verification)
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It's drawing a bit of a long bow to try and link the mad muzzie cleric, to this aircraft falling out of the sky.
It's not like it was full of God-bothering Westerners on a pilgrimage to convert 220 million Indonesians to Christianity.
The likelihood is high, that pilot error, or a maintenance stuff-up, will be behind the crash.
The main section of the wreckage has been located in 23M of water, the water is clear and visibility is good, and they have reportedly picked up pings from the aircrafts ELT.
The Indonesians have recovered quite a bit of wreckage - shattered panels, a shattered but reasonably complete wheel, luggage, wiring, an emergency slide, clothing, and 5 bags of body parts.
Everyone is hanging out to see and hear what's on the FDR and CVR.
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Pretty classic gung-ho American aviator style of flying. I wonder where the, "hold my beer guys, and watch this!" part of the video went to? I wonder what his record of writing off aircraft is?
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Juan Browne (blancolirio) has a nearly 10 min YouTube video on this incident - but he only goes over the details already known, and doesn't contribute anything major to the discussion - apart from the three following facts;
1. Explosive decompression as an initiator of the crash was unlikely to be a factor, due to the relatively low altitude of 10,000 ft.
2. He opines that the turbulent thunderstormy weather in the region of the crash, does not appear to be severe enough, to be a major factor in the crash.
3. The speed trim would be inoperative at the altitude the aircraft reached.
I'm surprised that he failed to mention turbulent air penetration maximum speed (Vb - 280kts KIAS), or manoeuvering speed (Va - 230 KIAS) for the B737-500.
The aircraft reached 284 Kts TAS and 287 Kts Ground Speed just before the initiation of the rapid track changes and altitude change.
While these are only indicative, they do give a clue that it's possible that either Va or Vb were exceeded, as the aircraft entered a patch of severe turbulence - or if it had banked to avoid a storm cell.
It is entirely possible that an excessive control input reaction by the PIC, in reaction to say, sudden, severe turbulence, or a lightning strike, right as Va or Vb were reached, may have caused excessive airframe stresses and catastrophic airframe failure.
However, as Juan Browne correctly points out, information from the CVR and the FDR will be the critical information required as to exactly what happened.
The Sriwijaya Air B737-500 has seating for 136 in economy, plus 3 in 1st Class. With a total of 62 POB, it would appear this aircraft wouldn't be anywhere near MTOW - unless some heavy freight was being carried.
Interestingly, of the 1988 Classic B737's built (with 389 B737-500's built), the crash rate for the Classic series, was a hull loss rate of 0.71 per million departures, versus 0.17 for the NG series. A total of 63 Classic B737's have now been lost.
The pickle fork cracking problems are not relevant to the Classic B737, the problem only appeared on the later B737 NG.
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....it jammed. This is a common problem with Chinese-made zips, and one of the reasons one needs to steer clear of them, to save oneself from extreme embarrassment.
"Oh God, no!", whispered Turbo. "Don't tell me - you failed to check if the zips were YKK when you bought that item?!"
"I can't get it undone!" cried Lisette. "I know how to fix it!", said Turbo, dropping to his knees, and fumbling with the zip. But despite his consummate zipper skills, Turbo was unable to get the zip to move.
"It's utterly and completely jammed!" cried Turbo. "It can't be moved without totally destroying the entire zipper!"
"Oh, NO!!", cried Lisette in despair. "This now means I'll have to buy another suitcase! I can't believe this! I have to throw away a perfectly good suitcase, simply because one zipper has jammed!"
"We've all been there and done that", said Turbo soothingly. "However, if you like, I can offer my services to........
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Reports are in that a Boeing 737-500, belonging to Sriwijaya Air, has disappeared off the radar, around 5 mins after taking off from Jakarta, bound for Pontianak in West Kalimantan. There were 56 pax on board, plus 6 crew.
FlightRadar24 is reporting the aircraft lost 10,000 ft in altitude in less than a minute, over the Java Sea. There are unconfirmed reports that fisherman in the area have found wreckage, but it is not clear at this point if the wreckage belongs to this aircraft.
Aircraft registration is PK-CLC (MSN 27323), and it was built in May 1994, making it well over 26 yrs old. The exceptionally rapid descent seems to indicate major catastrophic failure, an explosive device going off, or even possible pilot suicide.
Local fisherman and witnesses on the nearby Lancang Island reported hearing two loud explosions. The surface weather was stormy and raining intermittently at the time.
Water depth in the area where the wreckage was located, is reported as being around 15-16M deep.
https://twitter.com/flightradar24/status/1347850078644563969
https://aviation-safety.net/database/record.php?id=20210109-0
http://avherald.com/h?article=4e18553c&opt=0
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....the teenage Turbo as one of the main instigators of the false roll call - and he requested that Turbo attend the Headmasters office forthwith.
Turbo was appalled, apprehensive, anxious, agitated, alarmed and astounded, at the sudden and inexplicable turn of events.
The Chairman rarely visited - and what was he doing here, right at this moment? It could only mean that trouble was in store for the school - not just the teenage Turboy - and he'd have to think fast to.....
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Accountants have ruined a lot of good airlines, too.
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Just like soldiers know when to wheel on the parade ground, when the marker issues the order to wheel. I reckon the flanking marker bird or fish probably makes the call.
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It's an interesting fact that during WW2, and well into the 1960's, both the U.S. military, and Caterpillar, used "comic-book" style training booklets, with colourful picture images, to assist in troop training, and in plant operator training.
It was proven that these comic-book style booklets improved students learning rapidly, particularly where large classes were being taught, and where it was impossible to target individual students who needed learning assistance.
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....her washing machine agitator, which stretched the condom so much it read, "MAAAAAKE THEEEEE AAAAUUUUFF GGGGRRRRREAT AAAAAGGGAIN", which she read as "Maaate, Three August Nights Are Here Again" - because she wasn't wearing her glasses.
As a Neil Diamond fan, she was suddenly both excited and overwhelmed by the memory of Hot August Nights with her lovers, and memories of Neil Diamond concerts, where she got her........
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All cooling systems that encounter a wide range of temperatures need some form of airflow control or oil flow control. A simple oil thermostat is a wise investment.
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Shades of the B737MAX!
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.....harangue the assembled crowd to pursue a major search for all the lost and ignored votes for Turbo in the U.S. Presidential election just gone.
"There were millions of votes cast for me!, he cried. "It's your democratic duty to go find them! People love me, as a top-flight businessman with my business operations touching everyone in every corner of the globe - and with the number of friends I've got in high places, I should be President by now!
This election of Biden is a fraud, the vote counters threw out all my votes! I know that for sure, because I can produce rubbish bins full of votes for me, that were obviously discarded as having no value, simply because I'm an Australian businessman! This is outrageous! I could turn America around, overnight!!"
"Touching everyone is about right," muttered Onetrack. "I've been touched up by some con-artists, but Turbo takes the cake for......
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...n aXXhole as has been regularly leported? The word is out, that he won't stand for any clompetition, and wants to take over every business that stands in his way?!"
"Oh yes," said The Rat. "He's the biggest aXXhole since Trump, and he's got plans to run for President of the USA, too!"
"The only thing that's stopping him is......
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....consumed, for the benefit of the Gods". There was a studied silence as Xi digested this information and pondered over the ramifications for the Party - and his own position.
Finally, he spoke. "Who is this Lainbow Serpent guy, and is he amenable to coming on board the Belt and Road 50 year Plan? I can allange for him to have seat at Plarty table, and maybe even allow for him to say a few words, if you can plove he has substantial number of followers".
"Mate", said Cappy, "The Rainbow Serpent rules in Australia. We acknowledge him on every occasion, even at the opening of a dunny door".
"O.K.", said Xi. "You've convinced me this guy is some major powerbloker. I gotta meet him, and soon. He sounds like my kinda guy, and we sure could use someone who has a following like that".
"Geez, I dunno", said Cappy, looking perplexed, now. "This Rainbow Serpent guy is seen in public about as often as Kim Jong-un, and he's.........
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Jabiru7252 - I personally believe you're comparing oranges to apples by trying to introduce intestines operations into a discussion about engine oil cooling. For a start, the intestines are made of organic, living materials, and engines are built from inorganic, non-living materials.
The former are constantly growing and changing and interact internally with possibly up to 200 other organic chemicals to carry out their mission.
The latter do not grow, and interact only on a limited basis, externally, with other inorganic chemicals. The chemistry and physics applicable to each, are very different.
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Motion sickness pills seem to work for a lot of people.
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I can recall a certain model of Komatsu front end loader that was introduced in the late 1980's with a smaller capacity engine than the previous model, with the new engine turbocharged, and a lot more highly stressed than the previous model.
The oil capacity of the new engine was also considerably less than the previous engine, and the HP/Kw output was substantially more.
Within a relatively short space of time, this new engine was blowing up all too often, at relatively low hours.
Komatsu engineers were called in, and the result was the fitting of a much larger sump, with substantially increased oil capacity.
The premature engine failures stopped at that point, and the engine regained a reputation for reliability.
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You cannot use a spirit level in an aircraft because of acceleration
QuoteThat's a statement that cries out for an explanation
OME - When a spirit level is used on the ground, gravity is pulling the liquid in the bubble in one direction - directly downwards.
This ensures the bubble stays centred between the lines when the spirit level is level.
But in an aircraft, acceleration may be getting applied to the liquid in the level (G-forces), in directions other than directly downwards.
This will make the bubble travel to a different position, relative to the markings, than where it would be normally, when on the ground.
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......the washing on the line was very effectively hidden in the future. This would put a stop to all the scurrilous gossip and innuendo that was incriminating many innocent parties.
Meanwhile, back in the murky swamps of Kapookistan, there were rumblings that a certain Rat had made some major New Year Resolutions, and these cunning resolutions involved more than just zoom meetings, washing on lines, or intimate meetings. However, the resolutions did involve deep pockets - preferably someone else's deep pockets.
The entire gamut of the Rats Resolutions revolved around how he could get back into the air again, whilst someone else footed the bill for his cunning scheme.
What made his scheme even more clever, was the fact that, even though it was 2021, it was still the Year of the Rat, until Feb 11.
What more auspicious start could he get to his cunning Rat scheming, than starting it in the Year of the Rat!? And the fact that the Chinese were the ones most interested in getting their aviation industry off the ground, to take advantage of Boeing being on its knees? To that end, he picked up the phone, and made a call to Xi Jinping........
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A little late, Phil, but a belated HNY to you, too. Glad to hear you're still alive and kicking and haven't picked up that dreadful U.K. virus.
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Skippy - But cooling fins inside an engine are only releasing heat into the engine - which is where it's coming from in the first place. The radiated heat is not getting carried clear of the engine. You're only recirculating the heat.
It's the same with liquid cooling systems, where you have poor fan shrouding. The heat being radiated from the radiator core is recirculated into the radiator with inadequate fan shrouding, and you end up with cooling problems.
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Indonesian B737-500 goes missing, 5 mins after takeoff from Jakarta.
in Aircraft Incidents and Accidents
Posted
An Asian aviation analyst has brought up a good point. With COVID-19 dramatically affecting airlines, the likes of Sriwijaya Air, in line with all airlines, have downsized dramatically - cut the number of staff in every dept - from pilots to technicians to ground staff - and tried to save money in every possible manner.
The investigation will need to examine whether these desperate cost-saving measures might have impacted on the airworthiness of this particular aircraft.
It's entirely possible it flew with some inoperative instruments, maybe secondhand parts were used, perhaps even manufacturers operational time limits were being ignored, in the drive to not spend money.
I can recall one aviation analyst saying there will be an increase in aviation accidents as stored aircraft are returned to service, after months or even years of storage.
However, he failed to mention the impact of current desperate money-saving measures, that might impact on air safety and airworthiness, as airlines desperately try to stay afloat in these troubling times.