Typhoon1244
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- Jul 29, 2002
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No argument, just wondered what the general concensus was.Vik said:This lame brain argument again.
What's the matter, Vik? Do you have something to hide, hmm?
(Relax...kidding.)
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No argument, just wondered what the general concensus was.Vik said:This lame brain argument again.
fastandlow said:Too many large Boeings with similar fuel systems been flying for 35+ years and only one "blowing up" in flight. Don't buy it.
1. BACKGROUND: POTENTIAL EXISTS FOR HEAT BUILD-UP IN -135 AIR REFUELING/BODY PUMPS WHEN THE PUMPS ARE RUN DRY. THIS HEAT BUILD-UP MAY CAUSE CONDITIONS OF AN EXPLOSIVE NATURE IN THE BODY TANKS. DUE TO THE FUEL QUANTITY SYSTEM TOLERANCES AND DESIGN OF THE LOW PRESSURE WARNING LIGHT SYSTEM, IT MAY BE DIFFICULT TO DETERMINE WHEN A BODY TANK IS EMPTY. NORMAL SYSTEM TOLERANCES CAN RESULT IN A BODY TANK READING OF MORE THAN 500 POUNDS WHEN THE TANK IS IN FACT EMPTY.
2. PENDING ENGINEERING ANALYSIS AND INCORPORATION OF APPROPRIATE DATA INTO THE FLIGHT MANUALS, THE FOLLOWING PROCEDURES AND RESTRICTIONS WILL BE FOLLOWED. THESE PROCEDURES APPLY TO ALL -135 AIRCRAFT FLOWN BY SAC, ANG, OR AFRES AIRCREWS. ... THE PROCEDURES CONTAINED IN THIS OPS PROCEDURE TAKE PRECEDENCE OVER ANY PREVIOUS PROCEDURES.
A. FLIGHT CREWS WILL NOT ACCEPT AN AIRCRAFT FOR FLIGHT WITH LESS THAN 3000 POUNDS OF FUEL IN BOTH THE FORWARD AND AFT BODY TANKS ...
B. AIRCREWS WILL NOT ACCEPT AN AIRCRAFT FOR FLIGHT UNLESS BOTH THE FORWARD AND AFT BODY TANKS HAVE AT LEAST ONE GOOD AIR REFUELING/BODY PUMP. EACH OF THESE TANKS MAY CONTAIN ONE "SUSPECT" PUMP, ANNOTATED AS SUCH IN THE AFTO 781 ("DO NOT OPERATE PUMP OR RESET CIRCUIT BREAKER EXCEPT IN AN EMERGENCY") AND DEACTIVATED BY PULLING AND COLLARING THE 28V DC CIRCUIT BREAKER (CB) WITH A REMOVABLE COLLAR. ... IN AN EMERGENCY, CB COLLARS MAY BE REMOVED AND CIRCUIT BREAKERS RESET TO USE THOSE "SUSPECT" PUMPS. THEIR USE WILL BE LIMITED TO THAT NECESSARY TO SAFELY RECOVER THE AIRCRAFT. AIRCREWS WILL NOT ACCEPT AN AIRCRAFT FOR A PEACETIME FLIGHT WITH A REFUELING/BODY PUMP REMOVED OR AN INOPERATIVE /UNUSABLE PUMP INSTALLED WITHOUT A WRITTEN WAIVER FROM HQ SAC/LGM.
C. THE MINIMUM FUEL LEVEL IN THE FOREWARD AND AFT BODY TANKS IS 3000 POUNDS FOR ALL GROUND AND FLIGHT OPERATIONS. A NON-STANDARD FUEL LOAD WAIVER HAS BEEN GRANTED FOR ALL FUEL LOADS TO MEET THIS REQUIREMENT. THE 3000 POUND FUEL MINIMUM IN BOTH TANKS WILL BE TREATED AS TRAPPED/UNUSABLE FUEL. AS SUCH, IT WILL NOT BE CONSIDERED AVAILABLE FOR DIVERSION OR DELAY. ONLY AN ACTUAL EMERGENCY WARRANTS THE RISK OF DECREASING BODY TANK LEVELS BELOW 3000 POUNDS.
WARNING
AIR REFUELING/BODY PUMPS SHOULD NOT BE RUN DRY. IF PUMPS OPERATE DRY FOR A PERIOD EXCEEDING TWO MINUTES, DAMAGE TO PUMPS, FIRE AND EXPLOSIONS MAY RESULT.
D. FOR NORMAL OPERATIONS, AIRCREWS WILL TERMINATE OPERATION OF THE AFT PUMP IN EITHER BODY TANK WHEN THE QUANTITY IN THAT TANK REACHES 5,500 POUNDS. TERMINATE OPERATION OF THE FORWARD PUMP IN EITHER BODY TANK WHEN THE QUANTITY IN THAT TANK REACHES 3000 POUNDS. WHEN THE LIMIT IS REACHED, OPEN THE APPLICABLE 5 AMP 28V DC PUMP CONTROL CB ON THE SBCBP. ...
E. ... FLIGHT CREWS OPENING PUMP CIRCUIT BREAKERS AS PRESCRIBED BY THE MODIFIED FUEL BURN PROCEDURES WILL MAKE THE FOLLOWING ANNOTATION IN THE AFTO 781A (INFLIGHT DISCREPANCIES): "NOTE: AR/BODY PUMP CIRCUIT BREAKERS OPENED IAW HQ SAC FUEL BURN PROCEDURE." ...
Whale Pilot said:Being typed on the 747 and very familiar with the systems of the 747, I am sure that it didn't blow up on it's own. Go ahead and throw a match on a pool of jet a. The match will be extingushed. The fuel must be vaporized to attain the flashpoint for ignition.
Typhoon1244 said:No argument, just wondered what the general concensus was.
What's the matter, Vik? Do you have something to hide, hmm?
(Relax...kidding.)
atrdriver said:As far as TWA wanting to scream for further investigation, if you will remember they were just out of a bankruptsy at the time. Within 6 months of this event they announced that they would be purchasing 1 new aircraft every month for 6 years. Kinda funny sequence, considering they were still in pretty bad financial trouble on July 17, 1996. How did they suddenly get all the money for all those new airplanes?
fastandlow said:Too many large Boeings with similar fuel systems been flying for 35+ years and only one "blowing up" in flight. Don't buy it.
Vik said:I think there was an Iran Air 747 that also blew up due the center tank issue.
Typhoon1244 said:It's unorthadox in an airplane that's neither certified nor stressed for it.
Does anyone know whether or not the center tank pumps on N93119 were running as it climbed out on July 17th?US Air Force said:POTENTIAL EXISTS FOR HEAT BUILD-UP IN -135 AIR REFUELING/BODY PUMPS WHEN THE PUMPS ARE RUN DRY. THIS HEAT BUILD-UP MAY CAUSE CONDITIONS OF AN EXPLOSIVE NATURE IN THE BODY TANKS.
Lot more instances that I was aware of, but the point remains that there are an awful lot of 747 series AC that have and are still flying and this scenario is just too rare, making me suspect something else. But this is based on intuition and limited experience with this equipment.TonyC said:And if you don't wanna take my word for it, try browsing through this FAA Notice regarding Fuel Tank Ignition Prevention Measures.
Including the KC-135 I mentioned from October 1989, this document lists are 13 civilian and 13 military accounts of fuel tank explosions. All but 4 were Boeing products.
1982: Air Canada DC-9 center wing fuel tank exploded on the ground during maintenance - - Dry running of pumps is the suspected cause........
This is from Commander William Donaldson's report to the Congressional Subcommittee on Aviation two years after TWA 800 went down."...In congressional testimony and in statements repeatedly made in the media, the NTSB leadership cited the loss of an Air Force 707 and three KC-135 air to air tanker aircraft, to fuel tank explosions as examples of mishaps similar to TWA Flight 800. Col. Dougherty’s office of the Air Force’s safety center says, “there is no record of a 707 loss and all three KC135’s were fueled with JP4, a fuel as volatile as automobile gasoline”. “Since switching to the military equivalent of...Jet-A fuel the Air Force has not had a problem.”
Whale Pilot said:Just a little info from someone there!
AA Airbus flight crashed b/c the "God Pilot" F/O was trained that use of rudder to help regain the proper attitude is the proper procedure.
Whale Pilot said:He would have been trained because at the time American was training this. I know because I was a former TWA pilot who saw the video with 2300 other TWA pilots.
Whale Pilot said:Many of us were amazed that AA was teaching this "unorthadox" and dangerous procedure.
Whale Pilot said:As far as 800, I was flying back from KBOS to KJFK that evening. It didn't just blow up. I too, like many others saw the "streak" heading skyward from the ocean.
Whale Pilot said:Being typed on the 747 and very familiar with the systems of the 747, I am sure that it didn't blow up on it's own. Go ahead and throw a match on a pool of jet a. The match will be extingushed. The fuel must be vaporized to attain the flashpoint for ignition.
Typhoon1244 said:One thing I noticed in 90-1 is that the main issue they seem to have been concerned about was heat, not arcing.Does anyone know whether or not the center tank pumps on N93119 were running as it climbed out on July 17th?
In any case, it's my understanding that for a given quantity of Jet-A to ignite, it must be heated and misted. I didn't think "fumes" were enough to cause an explosion, regardless of what the ignition source is. But when you read about all those lost Stratotankers...perhaps I'm mistaken.
fastandlow said:Assuming it was a fuel tank explosion, where does the oxygen come from? I'd think, even though it's not very volitile, the jet fuel vapors would displace any oxygen in a partially or even empty fuel tank.
Typhoon1244 said:Now, back to the major problem I have with the official explanation: if TWA 800 was brought down by an accidental explosion in the center tank, then what exactly did all those witnesses see?
...
As I said, eyewitness accounts are notoriously misleading, particularly when it comes to aircraft accident investigation. But are we really supposed to believe that two hundred people--including a handful of military pilots--all got it wrong?
Dangerkitty said:That statement alone shows you have no clue what you are talking about. After TWA 800 Boeing came out with an AD for all operators of the B-747, B-767 and I think the B-757 to leave a certain amount of fuel in the center fuel tank to prevent such an explosion that happened on TWA 800.
C601 said:There is more questions then factual answers, none of us where there, all we have is info passed on from one person to another ... kinda defeats the whole purpose and most likely a complete waste of time,kinda like this thread
dash8driver said:this sounds like a job for Mythbusters!
atrdriver said:No, the FAA has NEVER issued AD's that were either unnecessary or suspect for some reason. There are a lot of inconsistancies in the TWA800 case. If you want to believe that it blew up by itself, fine. There are still a LOT of people,and will always be a lot of people, who believe otherwise.
atrdriver said:Come on...The F-117A was in sqadron service for almost 10 years before anyone outside the program knew that it existed. Don't tell me that the government can't keep a secret if they want it kept.
Typhoon1244 said:See how quickly I'm adapting to living in Tennessee?