Re: Double-hinged flap explained or shown??

Dear Convair, I am not entirely sure if the author may not have meant "double slotted flaps", as the DC10's flaps were single slotted. If it was indeed about double hinged flaps, the idea could have been an implementation of a NASA patent from 1967: https://ntrs.nasa.gov/citations/19700032...

Re: CFM Engine High Oil Consumption

Just a practical question: In the case of tri-jets, in particular the DC-10 and MD-11, the engine nr. 2 is mounted some 10m above ground. How is the oil level control and top-up performed? Logically, a cherry picker or similar device would be required to access the engine. Or is there a possibility ...

Re: Six arrests after brawl on board KLM flight

Aircraft was parked at the gate when this brawl broke out. So at not time was there any risk inflight. Call was made to the military police at Schiphol who arrived quickly and removed the party. This from a internal klm memo. Dear Flanker7, Thank you for this important clarification! In this case t...

Re: Six arrests after brawl on board KLM flight

One thing that I find disturbing (apart from the recurrence of such events in general) is that in this case the captain entered the passenger cabin attempting to calm the fighters. In my view as someone not familiar with the relevant procedures in place, isn't this a significant risk for this situat...

Re: BEA : EgyptAir MS804 crash caused by pilot smoking

Dear all, Regarding flammability of materials, there is a significant property called the Limit Oxygen Index (LOI). This index, expressed in %, defines the concentration of oxygen required to allow the material in question to sustain combustion at room temperature. Typical insulation materials have ...

Re: Augmented crew - logging flight hours

Dear all, Thank you for the interesting insights so far! Let me formulate a bonus question: How are pilots logging flight hours in practice? Have you got a classic booklet where you had write your hours? Is it an online tool or a program on your PC? Would you take these records with you in case of c...

Re: Airbus A321XLR Development / Testing / Production Thread - 2022

By the way, will the XLR get a separate ICAO designator?

Augmented crew - logging flight hours

Dear all, Just a short, stupid question: How are flight hours logged for pilots in an augmented crew setting? Let's assume a 12h flight with a crew of 3 (CA, FO, Cruise pilot). Would all 3 get the full 12h flight time credited to their logbook, or only these hours they are actually on duty? Thanks! ...

Re: Can Singapore Airlines 253 seats A350 do SIN-NYC mission if they are 280T variant?

5% contingency is normally not required for this type of flight. Some sort of variable contingency depending on route and conditions is carried. Often several tonnes less than 5%. 0.5 hours of reserve fuel is carried, and typically diversion fuel is also no less than 0.5 hours even if the nearest a...

Re: Can Singapore Airlines 253 seats A350 do SIN-NYC mission if they are 280T variant?

Dear SQ32,

0,6 hours of reserve fuel is just a little on the low side.
A contingency of 5% (5,6t) must be accounted for, plus diversion (a few tons), plus final reserve (3t).

Maybe your assumptions for OEW and flight time are a little on the high side.

Best regards,
hendric

Re: China Eastern 737-800 crashes in Guangxi, southern China

Malaysia Airlines' incident a few weeks ago, also a 738. Similarities? https://www.straitstimes.com/asia/se-asia/malfunction-of-pitot-static-system-affected-tawau-bound-malaysia-airlines-flight "Based on initial reports extracted from the flight data recorder (FDR), it was determined that a te...

Re: Location of data plate on Airbus aircraft

There are at least two of them: one in the door frame of L1, one in the rearmost door on the left side.

Re: DHL 757 off runway at SJO

Why do they refer to 'two souls on board' rather than two people?. This seemingly bizarre terminology is used to avoid any confusion. "Passengers" would not account for flight and cabin crew, "people" would not account for lap children, as they are treated differently on the pas...

Re: AF 011 go around

Can someone with knowledge in the 777 systems please give us a hint what is the signification of the alarm sounds in the flight deck which can be heard in the video? Autopilot disconnect wailer. Dear allnippon767, The sound at 0:43 is similar to a configuration warning sound. Could you confirm this...

Re: AF 011 go around

Can someone with knowledge in the 777 systems please give us a hint what is the signification of the alarm sounds in the flight deck which can be heard in the video?

Re: Condor launch new livery

Honestly, I am amused!
I would say that this livery does indeed fulfill the main purpose: make the airline recognisable while transporting the image of the carrier.

I'd say: "mission accomplished!"

Re: China Eastern 737 "Missing Contact"

High altitude stall ? While it's too early to speculate about the cause(s) of this accident, a stall looks rather unlikely. Based on FR24 data, the speed remains very constant, as the rate of descent. A stall would require a drop in airspeed, followed by a rapid onset of a descent, followed by sign...

Re: Sahara dust over Europe

Quick answer: most likely not at all. This phenomenon happens every now and then, typically several times a year. While the chemical composition _might_ be somewhat similar to volcanic ash, the concentration is a lot lower. Also, Aircraft are regularly operating in desertic places, where flying sand...

Re: Russian Invasion of Ukraine - Civil Aviation Related *Discussion* Thread

Dear all, Someone in the area of Kyev seems to have fun with an ADS-B transponder: https://www.flightradar24.com/FCKPUTIN/2b196bf0 We can observe the (in fact destroyed) An-225 flying circles around the capital and displaying an identification code in the form of an insult against the Russian leader...

Re: Flying a G-II with full reverse thrust? (Shuttle Training Aircraft)

Dear ehbowen, Highly interesting, thank you. And this is how it actually looked like flying the brick simulator aircraft: https://www.youtube.com/watch?v=z44bEm9MO6w There was also an episode of "Flying heavy metal" documentary series about this aircraft, but I could not find it. Kind rega...

Re: Lufthansa Group Fleet Thread - 2022

My guess is that OS will either get some older A330 from Swiss or LH or 787, depending on how good they perform. I don't know if it's "worth" it to invest expensive 787 in a low yield market like VIE. While the capacity and economics (capital and operating costs) of a used A330 from Swiss...

Re: Lufthansa Group Fleet Thread - 2022

B77W might be too big for Austrian. I can't think of any OS long haul destination can absorb the B77W capacity. Hello, I really can't see where else these 777W could go inside the LH group. Perhaps as P2F conversion to LH Cargo in a few years? I am still puzzled why LX did not take over a dozen of ...

Re: What Is the Minimum Runway Width for Airline Service?

According to Airbus, the 320 series can operate from runways as narrow as 30m / 98,4ft.
So yes, 100ft is possible.

Re: Airbus cancels two A350-1000 for Qatar Airways

At least these two parked NTU QR 350-1000s will get a fresh coat of paint...

Re: Third and fourth freedoms of air

Ziyulu wrote:

I don't understand the difference between third and fourth.

Re: A380 Reverse Thrust On Landing

Never knew the KC-46 has no reverse thrust, do you know why? My guess would be about mission profile: The KC-46 being a tanker aircraft, it will usually come back very light after the mission, since it did not only consume most of its trip fuel, but also its payload. Less landing weight means less ...

Re: SAS flying an A321LR CPH-IAD

From a regulatory standpoint, would they need an augmented crew for that flight?

Re: A380 Reverse Thrust On Landing

Interesting, the military connection. I was amazed seeing Canada's RCAF C-17's, up close and personal, to see not only the fan thrust was "reversed" but the core thrust was blocked during landing ops. Given the ratio of 75/25 for fan/core thrust production on landing, that extra 25% block...

Re: Uncommanded thrust reversal deployment

Hello, This is a rather challenging scenario that - at least as far as I recall - has never happened in reality. If an engine running at takeoff thrust suffers an uncommanded TR deployment (there are effective safeguards to prevent this, but let's assume this still happens), this will cause a very s...

Night Curfew vs. Emergency Landing

Dear a.netters, I am living not too far away from Vienna airport (VIE / LOWW) in Austria. This airport observes a night curfew between 23:00 and 6:00 local time every night. However to my knowledge, the curfew does not apply for emergency landings. I wonder what kind of preparations the airport (or ...

Re: Status of electric pushback tugs at MAD (Madrid)?

Dear all,

Electric drive would be great for tugs. Max. torque at 0rpm, heavy batteries provide grip, braking energy fed back into the batteries.
The environmental benefit comes on top.

Hendric

Re: aerospatiale A200 from the 1980'?

Dear all, I once tried to find out if there was any "Dassault Mercure genes" to be found in the A320 genealogy. I researched the fuselage diameter and found different values for the A320 (3,95m / 13ft) and the Mercure (3,89m / 12ft10in), which is an indication of unrelated designs. With re...

Re: A321LR flight level?

Obviously I am not a pilot. Nevertheless, I have analyzed some A321LR flights, specially the long range flights Air Portugal operates, and I have noticed that the flight level is usually below FL340. Is it possible to say that the A321 LR or the future XLR is not able to climb to a higher altitude ...

Re: Airbus A350 Production/Delivery Thread - 2022

283t is 3 tons more than the highest MTOW I was aware of until now.
This can be a significant upgrade for ULH operations, with roughly half an hour of additional endurance.

Re: Should passengers report possible maintenance issues to crew

Dear all, I would also agree with the consensus that as a PAX we should report any relevant observations to the FA as appropriate. Once on a flight with Austrian on a F100, I looked out of the window during a night time approach to VIE and observed an object - likely a bird - hitting or almost hitti...

Re: Altimeters, static pressure, and lift

Dear all, This thread is a highly interesting read for me, thanks to all contributors. I have the impression that the debate over the origin of lift generation through pressure differential or flow deflection is somehow similar to the debate over the the particle or wave nature of light. It's a dual...

Re: EL AL Johannesburg route 720B 1968

Dear dennys, TLV-JNB is shy of 3'500nm according to gcmap. http://www.gcmap.com/mapui?P=tlv-jnb&MS=wls&DU=nm Wikipedia states the range of the 720B at 3'200nm. https://en.wikipedia.org/wiki/Boeing_720#Specifications This would make me believe that a 720B would struggle a lot to cover this di...

Re: Airbus A321XLR Development Production Testing Thread - 2021

https://twitter.com/Tobias_Gudat/status/1472970559189397507?t=tYACw9-Y_4GPhQnciBN7mg&s=19 If I am not mistaken, I see a double slotted inboard flap on the picture. Wasn't it told publicly that the XLR would receive a flap upgrade in the form of an evolved single-slot design? Kind regards, Hendric

Re: 787 Cruise Mach at Cost Index 300

gloom wrote:

I know both LH and LO do (or did) that sort of cruise speed calculation. Go on 280/.74/300 profile, and it's done. Would you care to guess the plane by numbers?

Re: Last scheduled passenger transatlantic crossing in a prop aircraft?

The DC-8-63 entered service in July 1967. KLM was the initial operator. Not sure what their initial passenger capacity was, but it was more than 189. The CL-44D has entered service at Loftleiðir in may 1964, so it may indeed have been the biggest airliner over the Atlantic Ocean for just over 3 yea...

Re: Last scheduled passenger transatlantic crossing in a prop aircraft?

Fun fact: at one time shortly before the arrival of the 747, the Canadair CL-44 was the highest capacity aircraft flying over the Atlantic ocean. These had 189 seats.

Re: Procedures if a sick/incapicated pilot or co-pilot in flight ?

Dear ltbewr.

Most likely, cabin crew would evacuate the incapacitated pilot towards the forward galley.
It's much more convenient to start the treatment there, instead of inside the cramped cockpit, where an additional person might inadvertently touch a control or a switch.

Hendric

Re: 121.5 now a political forum in US

(Edit: initial post asking about the possibility to use 123.45 for off-topic chat replaced by additional info) I wondered whether VHF 123.45 could be used for "off-topic" conversations between pilots. The answer is NO, except - with reservations - in oceanic space far from VHF ground stati...

Re: Restrictions on #2 Thrust Reverse L1011/DC10/MD11

Talking about thrust reversers on a DC-10 or MD-11, would nr. 2 also be subject for retraction below 80/60kn like on most wing-engined aircraft?
I understand that the speed limit is there to avoid FOD ingestion, but this should not be an issue on the engine some 10m (?) above ground?

Re: Use of rudder in commercial aircraft

Oh yeah, engine out seems logical.
Isn't Airbus FBW trained to compensate asymmetric thrust automatically, though?

Use of rudder in commercial aircraft

Dear a.netters, I wonder how much pilots of commercial aircraft will use the rudder at all. My assumption is that manual input on the pedals is required only during takeoff in crosswind, during flare or just at touchdown to align the aircraft to the runway (x-wind scenario again), and finally to kee...

Re: Is innovation declining?

It really isn't all engine. The A350 wing is much more efficient than the A330/A340. The cruising altitude and speed of the A350 are quite different compared to the A340. Several thousand feet higher initial altitude. M0.85 compared to M0.81-0.82 doesn't sound like much but over medium and long hau...

Re: Is innovation declining?

I'd be curious how much of the efficiency of the A350 over the A330 (and over the B747) comes from a lighter structure. The A350-900 has an OEW of 115,7t, whereas the A330-300 has 122t (Wikipedia). However, the A350 carries about 10% more people at similar layout. The OEW difference itself will res...

Re: A couple of battery electric aircraft questions. 1 noise, and 1 cost.

Let's look at the cost: Jet A1 fuel currently costs approx 0,64€/kg and contains about 12kWh/kg. The cost per kWh is therefore about 5,34ct/kWh Electricity for industrial scale users currently sells around 6-7ct/kWh. Now assuming an overall efficiency of a modern turbofan engine of 40% and the one o...