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What is the "Design Speed"? (Agusta)
What is the "Design Speed"? (Agusta 139)
TIA |
OK Now pop the clutch!
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Vie,
The criteria for the allowable winch cable angle is set out in AC 29-2C (the more relevant part underlined): "In all approved cases, appropriate winch system placards and flight manual restrictions should be provided. Also, for Class D load combinations, the winch or hoist should have a demonstrated, acceptable level of reliability (for the phases of flight in which it is operable and in which the Class D load is carried externally). The winch should be disabled (or utilize an overriding mechanical safety device such as a flagged removable shear pin) to prevent inadvertent load unspooling or release during the phases of flight that the load is carried externally and operation is not intended. The maximum allowable winch cable angle should be determined and approved. This is primarily a structural requirement but should also be reviewed from an interference and flight handling criteria standpoint." Jim |
JimL Surely none of that actually ensures the angle is practical for operational HHO (though the cable may be strong enough, stay clear of obstructions and the aircraft may still handle adequately).
The idea of a dual hoist is to give redundancy when winching not lower people down to the back of the cabin:ok: Is the long nose / short nose feature a good indication of who knows about winching and who doesn't? Is the 5º forward angle to cut drag airframe in crusie? |
Mast angle
Is the 5º forward angle to cut drag airframe in crusie |
Long Nose not making any real difference to CG.
Try doing a calculation with 40kg located at the nose wheel station of your short nose ........... |
Good times...
:ok: http://www.verticalmag.com/control/n...es/?a=5894&z=6 CHC Helicopter Corporation Signs A Contract For Thirteen AW139 Helicopters Monday, November 05, 2007 / AgustaWestland AgustaWestland is pleased to announce that CHC Helicopter Corporation through its global helicopter support division, Heli-One, has signed a contract for thirteen AW139 medium twin helicopters. The order value is worth approximately 140 million dollar. This new order, which adds to the previous one for twenty AW139s, will further expand CHC's AW139 fleet dedicated to offshore and emergency medical service missions. CHC, as the world's largest provider of helicopter services to the global offshore oil and gas industry, started incorporating the AW139 helicopter into its fleet in 2005 as part of its fleet renewal and expansion plans. Renzo Lunardi, Senior Vice President Commercial Business Unit, AgustaWestland said "We are proud and delighted that a leading operator such as CHC, by executing this contract, has committed to add additional AW139s to its fleet of aircraft. The AW139 is the best selling medium twin engine helicopter in the world and will enable CHC to deliver improved levels of performance, safety, capacity and comfort to its customers." The AW139 has quickly become the twin engine helicopter of choice for offshore oil and gas support operations with sales of over 100 aircraft for this market. The AW139 is ideally suited for the offshore role, with its large cabin and baggage compartments allowing it to transport 12 to 15 passengers while offering ease of access and egress by way of its large sliding cabin doors. The AW139's excellent characteristics including its roomy and unobstructed cabin make this helicopter an ideal choice for EMS and SAR applications as well. CHC is progressively expanding and strengthening its capabilities in emergency medical services and search and rescue markets, offering increased capabilities and improved services. CHC was awarded a contract in March 2007 to operate three AW139s in Australia providing improved emergency medical and rescue services 24 hours a day, seven days a week. Almost 300 orders have been placed by more than 80 customers from over 30 countries to date, making it the benchmark helicopter in the medium twin category. Designed with inherent multi-role capability and flexibility of operation, the AW139 can perform many roles including offshore transport, search and rescue, emergency medical service, VIP/corporate transport, law enforcement and utility missions. Gulf Helicopters Order 10 AW139 Helicopters Tuesday, November 13, 2007 / AgustaWestland AgustaWestland is pleased to announce the signing of a contract with Gulf Helicopters of Qatar for 10 AW139 helicopters. The aircraft will be equipped for offshore passenger transportation operations. The agreement also includes the establishment of an AgustaWestland Service Station in Qatar for the AW139. The overall contract value is approximately 130 million dollar. This order further consolidates the AW139 as the best selling medium twin engine helicopter both in the Middle East region and in the worldwide offshore transport market. Giuseppe Orsi, CEO, AgustaWestland said "We are delighted Gulf Helicopters has chosen the AW139 as part of its fleet renewal programme. Gulf Helicopters is the latest operator who will able to take maximum advantage of the operational advantages of the AW139, the best medium twin for offshore transport operations. This order is further evidence that AgustaWestland has also become the helicopter company of choice for competitive and complete offshore transport helicopter solutions." This latest order means AW139 sales have now broken the 300 mark with orders from more than 80 customers in over 30 countries. The only new generation helicopter in its weight class, the AW139 has become the benchmark helicopter in the medium twin market. Over 100 aircraft are now in service performing offshore transport, VIP transport, law enforcement, utility, SAR and emergency medical service missions. Gulf Helicopters is a wholly owned subsidiary of Qatar Petroleum, a company wholly owned by the government of the State of Qatar. Gulf Helicopters have been providing helicopter services since 1970 working with companies throughout the Middle East, India and North Africa. Gulf Helicopters has its own in-house maintenance facility with a team of highly qualified and experienced engineers undertaking fleet maintenance and modification work. |
I flew the 139 this year.
I did some SAR style sorties in a short nose. We averaged 6 degrees nose up but what surprised me was that you hardly noticed. In particular the rear crew said this was a non event for them and they had no issues with the angle of dangle created by the hoist - although it was a single installation. We are expecting the long nose to reduce the amount of nose up to about 4-5 degrees for a SAR cab in the configuration we want it in. Overall, very very impressed with the cab. |
Spoke with a friend today who did some hoisting in a 139 as well... said the nose was up about 15 degrees usually in the hover, and this created quite an issue during overwater evolutions. Rotorwash was somehow sucked down in the front and along the belly of the chopper, which went straight down and created a very strong and odd current in the water. If the aircraft hovered over the swimmer for more than a few seconds, he would always end up getting pushed about 30 deg left off the tail, for a ways. The only way they could do it was come in and quickly drop the hook to the swimmer, then slide the ship away and stand off while he hooked up and/or got the victim ready to be winched. He's winched off a lot of platforms and said the 139 was by far his least favorite.
Nice chopper tho! Mike |
Hover controllability
Folks
I have no operational experience but I have a considerable test experience and I'd like to offer some data to take into consideration. 139 pitch attitude in hover varies from +6 to +10° depending of CG. Considering that the 139 has an excellent hover controllability performance, even up to new 6800 kg Gross Weight, that allows 45 kts wind from any direction with planty of margins, you could easily lower your pitch attitude leaving the relative wind at your right side (90° Az). With wind from right you can lower your pitch attitude from +7° to +4° at 20 kts and +3° at 30 kts with forward CG. Similar figure at Aft CG. This could look odd but you can do it with the 139 easily and safely with a lot of margins. Remember that head wind will not lower your pitch attitude. I hope this can help |
increase to 6.8t
Hi bpaggi,
Interesting news especially the increase in MGW to 6.8t. Is this official now and if so to what serial numbers does this apply. |
It is not official yet.
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bpaggi
Is 6800kgs expected by mid-2008? The sooner, the better in any case. Other than a performance limitation at around 8000ft, any other effects anticipated? |
Too early to say officially but the aircraft flys perfectly also at the new increased weight.
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TwinHueyMan
My experience of flying the 139 was not how your friend described it at all. I fly the 412 and my crewman thought the downwas was pretty identical to the 412 on the 139. With about 5 kts of wind the downwash was just aft of the baggage bay giving a clear area for the winchman. I have heard some of the early machines - probably set up as 15 seaters - can hover like that but I haven't flown one of them so I am only repeating 3rd hand info. What I can say first hand is what I already have. bpaggi Interesting idea. As said though I found the forward visibility to not be a problem at the higher nose up. The only other thing I did notice was just how fast the ship is and how much you have to anticipate to slow it down. Now then I did get the nose up in my quick stop! I really am very smitten with it! |
Main Transmission Oil Changes
Hi Gents
We have a new AW139 arriving soon. The Main transmission is full of preserving fluid. Question? Is it possible to drain the oil from the transmission without the electric pump the IETP recommends? We have the drain adaptor, can we use a hand pump and gravity method? or is it better to get the electric pump? Thank you. |
Draining AW139 MGB and Engines
I purchased a hand powered vacuum type oil removal pump / tank from a local marine supply and it works real well. Depending on what brand you get you can adapt it to the MGB drain hose using cheap plastic hose adapters. It came with some small tubes so you can also pull the oil cap adapter on the PT6 and drain the engines also. No more messing around with the drain plugs that are so close to the horizontial firewall there is no room for a drain pan. Total cost $60 dollars.
Agusta Electric Pump $$$$$$$$$$$ |
We got the electric pump from Agusta. No mess, no fuss, drains the main gearbox in less than a minute. Make sure you hold onto the hose in the bucket, that oil fair flies out of the gearbox! You might as well get the pump, you'll be doing oil changes every 300hours when you change the filter
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Main Tx Oil Draining
OK, so we can get away with draining via the hand pump method. Might be easier in the long run to get the electric pump though by the sounds of things. Thanks for that.
Next question? main wheel tyres, the part listed in the IETP, is this a Dunlop tyre? Besides Augusta, where can we purchase these tyres from and are there other makes out there the same size? Cheers. |
only agusta
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