Search found 580 matches

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by Horstroad
Mon Oct 19, 2020 1:28 pm
Forum: Technical/Operations
Topic: When and why did parallel parking jetways die out?
Replies: 7
Views: 2398

Re: When and why did parallel parking jetways die out?

do any airports still use this parallel boarding arrangement today? FRA still has 3 such gates. The aircraft taxi in, turn about 90° to the right and stop parallel to the terminal. They then can taxi out on their own power. They only use one jetway though. https://i.postimg.cc/ZZ6Xhtwm/Screenshot-2...

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by Horstroad
Sun Oct 18, 2020 10:30 am
Forum: Technical/Operations
Topic: How can turboprops like C-130 and A400M cruise at the same height and speed as jets?
Replies: 34
Views: 5200

Re: How can turboprops like C-130 and A400M cruise at the same height and speed as jets?

It might be possible on a low bypass engine, but not probable. In a typical jet engine, the fan is not directly connected to the core engine. You can spin the fan all you want, the core will not turn. In fact, there was a procedure on the old JT9D-7XX where you could tie the fan down and run the en...

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by Horstroad
Sat Oct 17, 2020 7:23 pm
Forum: Technical/Operations
Topic: Qatar Airways threatens Pilots for taxiing with both engines
Replies: 46
Views: 9409

Re: Qatar Airways threatens Pilots for taxiing with both engines

All the above mentioned cases aren't the norm. Like steep slopes or contaminated taxiways. Especially in the ME you wont find that many contaminated taxiways, even in winters. As OP said they're aiming for 95%, not 100%. So there's room for edge cases and exceptions. Yet they're at 55% (claimed). So...

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by Horstroad
Sat Oct 17, 2020 6:37 pm
Forum: Technical/Operations
Topic: How can turboprops like C-130 and A400M cruise at the same height and speed as jets?
Replies: 34
Views: 5200

Re: How can turboprops like C-130 and A400M cruise at the same height and speed as jets?

A C-130 can start another C-130 by parking in front of it and using prop “wash” to windmill the other Herk. Wouldn't that be possible with jet engines as well? I assume this is a procedure only trained in the military... but I could imagine this might work with commercial jet powered aircraft as we...

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by Horstroad
Mon Oct 12, 2020 12:06 pm
Forum: Technical/Operations
Topic: Off position for landing gear handle
Replies: 24
Views: 5203

Re: Off position for landing gear handle

But if the plane is on the ground with center gear up yet there is an unexpected increase in payload (say, a plane scheduled to do an earlier departure suddenly goes tech), there's a dilemma. One could simply limit the payload. Or if you were at a major airport, perhaps jack up the plane to lower t...

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by Horstroad
Tue Oct 06, 2020 11:28 pm
Forum: Technical/Operations
Topic: In your airline, do you start the APU upon landing?
Replies: 23
Views: 4335

Re: In your airline, do you start the APU upon landing?

At my airline they (I'm not a pilot) don't start the APU at our home station. Or whenever there is a GPU available at an outstation. Someone calculated that it consumes more fuel to start the APU than to keep an engine running for the 30 seconds to a minute until external power is available. We don'...

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by Horstroad
Sat Sep 26, 2020 6:45 pm
Forum: Technical/Operations
Topic: Interesting Flight Who knows what this is??
Replies: 6
Views: 2152

Re: Interesting Flight Who knows what this is??

You mean this?

Image

Probably google or a similar provider updating the "satellite" layer of their maps service

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by Horstroad
Sun Sep 13, 2020 12:02 pm
Forum: Technical/Operations
Topic: Hazardous APU exhausts
Replies: 14
Views: 4025

Re: Hazardous APU exhausts

On the DC10/MD11 the APU exhaust isn't strong enough to blow someone over. But I agree that the exhaust gases aren't particularly healthy. I would prefer a PACK RAM air exhaust over the APU exhaust for warming up in the winter. The APU exhaust is right next to the ENG2 oil and ENG2 IDG oil fill and ...

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by Horstroad
Sat Sep 12, 2020 2:36 pm
Forum: Technical/Operations
Topic: Why no more multi-slot flaps?
Replies: 32
Views: 4617

Re: Why no more multi-slot flaps?

Would it be correct to assume that this requires FBW (at least for the spoilers) since traditional methods have separate controls for spoilers and flaps? FBW is not required. The MD11 lifts the spoilers slightly when the flaps are extended to prevent the upper surface of the flaps from rubbing on t...

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by Horstroad
Sun Aug 30, 2020 3:48 pm
Forum: Technical/Operations
Topic: DC10 number two engine position
Replies: 13
Views: 1904

Re: DC10 number two engine position

One design detail I’d like to see how Douglas resolved was how they routed the rudder control cables around the #2 engine along with the hydraulic lines and the mechanism to connect it all together, it seems like quite a challenge Fire Protection https://i.postimg.cc/Jhgs3png/fire-protection.png Fl...

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by Horstroad
Sun Aug 30, 2020 2:49 pm
Forum: Technical/Operations
Topic: Cockpit windows that can be opened
Replies: 6
Views: 2294

Re: Cockpit windows that can be opened

One reason I can think of for the non-opening windows on the A350 is that all the panes are curved, and quite large. The A330 panes are flat and significantly smaller. The A350 cockpit is quite a bit wider so you need the bigger windows to maintain the field of view. The large, curved side window w...

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by Horstroad
Tue Aug 25, 2020 3:05 am
Forum: Technical/Operations
Topic: When thrust lever 3 corresponds to engine n°4 (a 747 case)
Replies: 35
Views: 4040

Re: When thrust lever 3 corresponds to engine n°4 (a 747 case)

The traveling public is pretty smart; someone takes off with “several centimeters of snow or visible ice on the wings” and it’s going to be photographed by a passenger and made public. Call me crazy, but I haven’t seen nor heard of anything like that In the US. I think some people post as pilots he...

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by Horstroad
Fri Aug 21, 2020 11:35 pm
Forum: Technical/Operations
Topic: Approach Lighting - Sequential Flashing Strobes
Replies: 10
Views: 1405

Re: Approach Lighting - Sequential Flashing Strobes

LH707330 wrote:
You got some screenshots to post up? That would help people chime in on the realism of it.

Image

Can't edit the previous post

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by Horstroad
Fri Aug 21, 2020 10:52 pm
Forum: Technical/Operations
Topic: Approach Lighting - Sequential Flashing Strobes
Replies: 10
Views: 1405

Re: Approach Lighting - Sequential Flashing Strobes

definitely not realistic. When I first saw it I thought it was supposed to be some kind of reflection on water with some aliasing problems. They're directional, as mentioned before. I bet someone can find some ICAO specifications. Also they're not on all the time, only during low visibility. MFS2020...

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by Horstroad
Sat Aug 08, 2020 8:30 pm
Forum: Technical/Operations
Topic: Found a landing gear door washed up on a beach - aircraft ID?
Replies: 55
Views: 13299

Re: Found a landing gear door washed up on a beach - aircraft ID?

I think there has to be a much more rational explanation than Aeroperu wreckage however, as far I know the only other 757 in the ocean is the Birgenair plane. As I said, it might be from that Aeroperú aircraft. It might as well be just a scrapped part that made it to the ocean somehow, as suggested...

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by Horstroad
Sat Aug 08, 2020 5:06 pm
Forum: Technical/Operations
Topic: Found a landing gear door washed up on a beach - aircraft ID?
Replies: 55
Views: 13299

Re: Found a landing gear door washed up on a beach - aircraft ID?

I think Occam’s razor applies, the simplest solution is probably the correct one. Just my opinion but the simplest to me being that the part in likelihood is not even a plane part but just a piece of a boat or ship debris. There is a remote chance it could be a 757 part from Aeroperu, but I’ll say ...

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by Horstroad
Thu Aug 06, 2020 1:05 am
Forum: Technical/Operations
Topic: Found a landing gear door washed up on a beach - aircraft ID?
Replies: 55
Views: 13299

Re: Found a landing gear door washed up on a beach - aircraft ID?

You might be right. Eight screw holes between the stripe and the edge of the door. See Here: http://i.imgur.com/IUgvALR.jpeg http://www.rarco.com.au/wp-content/uploads/2020/08/20200804_203734-Copy.jpg Could be a "5" painted on that door. 0229295 http://en.wikipedia.org/wiki/Aeroper%C3%BA_...

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by Horstroad
Wed Aug 05, 2020 5:01 pm
Forum: Technical/Operations
Topic: Found a landing gear door washed up on a beach - aircraft ID?
Replies: 55
Views: 13299

Re: Found a landing gear door washed up on a beach - aircraft ID?

Looks like a 757 aft R/H nose landing gear door

Image
aft L/H shown

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by Horstroad
Tue Aug 04, 2020 7:03 pm
Forum: Technical/Operations
Topic: Multiple external power switches
Replies: 12
Views: 1837

Re: Multiple external power switches

Secondary power can only be applied if primary power is connected. I'm not sure about that. From the top of my head I remember that the bus power control unit can get powered by the P200 bus or battery power. To get power directly from the secondary power receptacle to the BPCU the bus tie relays n...

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by Horstroad
Mon Jul 20, 2020 1:55 pm
Forum: Technical/Operations
Topic: Civil Airliners with the highest climb rate. MD11?
Replies: 40
Views: 4288

Re: Civil Airliners with the highest climb rate. MD11?

The MD-11F should be excluded because the OP specifically mentioned passenger aircraft. The flight he linked was a FedEx MD11F. So I assume when he mentioned "passenger aircraft" he actually meant "commercial aircraft"? :scratchchin: I did some thrust to weight calculations earl...

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by Horstroad
Mon Jul 20, 2020 9:26 am
Forum: Technical/Operations
Topic: Civil Airliners with the highest climb rate. MD11?
Replies: 40
Views: 4288

Re: Civil Airliners with the highest climb rate. MD11?

I suppose you'd have to fly them all on the same day, from the same runway, with no payload and 20% of max fuel or something like that. I wouldn't mind watching this competition. 8-) I would place my bet on the MD11 :D The digital readout limit for the vertical speed band is 9,900 fpm. When the con...

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by Horstroad
Mon Jul 13, 2020 11:49 am
Forum: Technical/Operations
Topic: Are the displays in the 777 Interchangeable?
Replies: 6
Views: 1927

Re: Are the displays in the 777 Interchangeable?

They get changed regularly. You will often see burn in from where the screen used to be. But they get swapped to try and prevent this. We don't do that. Not that I'm aware of at least. And I've never seen burn in. Did they use a different part number earlier? Did they changed it when they upgraded ...

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by Horstroad
Sun Jul 12, 2020 7:24 pm
Forum: Technical/Operations
Topic: Are the displays in the 777 Interchangeable?
Replies: 6
Views: 1927

Re: Are the displays in the 777 Interchangeable?

Yes. All 6 display units are interchangeable. edit: It's not meant for pilots to swap them. But they may be swapped by technicians on the ground to be MEL compliant edit2: here is the MEL: One may be inoperative in the lower center DU position. 1. The six display units are interchangeable. If the in...

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by Horstroad
Sat Jun 13, 2020 8:50 am
Forum: Technical/Operations
Topic: Volumetric capacity of passenger freighters
Replies: 12
Views: 1876

Re: Volumetric capacity of passenger freighters

I misunderstood your answer then. I took it that you referred to the 747 P2F as an example that the floor loading is more relevant than volume but that your last sentence was an answer to the original question.

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by Horstroad
Fri Jun 12, 2020 9:58 pm
Forum: Technical/Operations
Topic: Volumetric capacity of passenger freighters
Replies: 12
Views: 1876

Re: Volumetric capacity of passenger freighters

mmo wrote:
Funny how you didn't include that one too????

The original question was not about a converted P2F but about pax aircraft used as freighters with the seats removed.

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by Horstroad
Fri Jun 12, 2020 8:28 pm
Forum: Technical/Operations
Topic: Volumetric capacity of passenger freighters
Replies: 12
Views: 1876

Re: Volumetric capacity of passenger freighters

Volumetric capacity is close to a pure F I doubt that. Isles have to remain open, overhead bins still installed, galleys and lavatories still installed. I would say 1/4 to 1/3. https://lh3.googleusercontent.com/xxIvtpYYL3pCuFea6a2twgS4EUjELpOAfc2sHz-9MHe709qJeBiKXtKhJkfAoKxyo8De9HhPwijrfTGFYgNDehkR...

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by Horstroad
Tue May 26, 2020 1:43 pm
Forum: Technical/Operations
Topic: 747-400 elevator control system
Replies: 14
Views: 2536

Re: 747-400 elevator control system

747classic wrote:
On the 744 Stab Trim is all electric (no manual stab trim levers in the cockpit).

Why did they drop the manual trim levers on the B747-400 but keep/reintroduce them on the newly designed B777 6 years later?

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by Horstroad
Sat May 16, 2020 1:51 pm
Forum: Technical/Operations
Topic: Airbus fuel pumps start amperage
Replies: 4
Views: 1476

Re: Airbus fuel pumps start amperage

What does it mean - instantaneous ? Is 1-2 seconds enough? instantaneous adjective UK /ˌɪn.stənˈteɪ.ni.əs/ US /ˌɪn.stənˈteɪ.ni.əs/ happening immediately, without any delay And 1.1A - can you give me reference to documentation on this? Goodrich Actuation Systems Component Maintenance Manual C12CB001...

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by Horstroad
Wed May 06, 2020 3:45 pm
Forum: Technical/Operations
Topic: Airbus fuel pumps start amperage
Replies: 4
Views: 1476

Re: Airbus fuel pumps start amperage

Acceptable test conditions for an A320 APU fuel pump are "instantaneous starting at each test" and less than or equal to 1.1A during operation

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by Horstroad
Tue Mar 31, 2020 12:37 pm
Forum: Technical/Operations
Topic: Using passenger aircraft as freighters during this crisis
Replies: 20
Views: 4397

Re: Using passenger aircraft as freighters during this crisis

What would be the max cargo of a pax configured 772 and 788/9? The lower deck cargo capacity of a B77F is 57t. 30.6t in the fwd cargo compartment, 22.2t in the aft cargo compartment and 4.0t in the bulk cargo compartment. I'm not a weight and balance expert, so it might be less due to CG limitation...

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by Horstroad
Thu Mar 12, 2020 7:04 pm
Forum: Technical/Operations
Topic: Would the MAX be having issues if it had the PW GTF?
Replies: 18
Views: 4106

Re: Would the MAX be having issues if it had the PW GTF?

MCAS was put on the MAX to make it's handling characteristics be so similar to the NG that pilots didn't need simulator training. By doing so airlines would save money on training which ultimately makes ordering the MAX more attractive. MCAS is a longitudinal stability enhancement. It is not for st...

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by Horstroad
Thu Mar 05, 2020 12:30 am
Forum: Technical/Operations
Topic: Cabin Air Recirculation Filters against Covid-19? (ATA 21)
Replies: 46
Views: 5854

Re: Cabin Air Recirculation Filters against Covid-19? (ATA 21)

I always thought the first stage of bleed air is rather hot....and those bugs do not do well in that type of environment. Hot bleed air from the engines or APU goes to the PACKs where it gets cooled down. Some of the hot bleed air bypasses the PACKs and rejoins the cooled air to get the desired tem...

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by Horstroad
Thu Feb 27, 2020 11:15 am
Forum: Technical/Operations
Topic: Silly designs in otherwise great aircraft
Replies: 56
Views: 8057

Re: Silly designs in otherwise great aircraft

Where to start? Where to end? This list could be veeeery long. -On the 777 there is no dust bin at all on the flight deck. -On newer 777 you have to switch ON the printer right after you supply external power or the aircraft will be unhappy and you'd have to reboot if you forgot the printer. -There'...

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by Horstroad
Tue Feb 11, 2020 11:34 pm
Forum: Technical/Operations
Topic: Strange probes on the A350
Replies: 20
Views: 2906

Re: Strange probes on the A350

What kind of RPM are we talking? Is the RPM governed to an upper-limit? On the 777 the rat is governed by flyweights to 4510 rpm. It is a 41.5" two-bladed turbine which produces 7.5 KVA 115v ac and 2850 psi hydraulic pressure with a flow rate of 10 gpm. The test of the MD11 rat is the loudest ...

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by Horstroad
Thu Jan 16, 2020 10:05 pm
Forum: Technical/Operations
Topic: Is the raked wingtip style different among current acft using it?
Replies: 5
Views: 1124

Re: Is the raked wingtip style different among current acft using it?

ojjunior wrote:
Am I missing any other model?

Embraer E2
Image

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by Horstroad
Sun Dec 29, 2019 12:39 pm
Forum: Technical/Operations
Topic: Unplugging of devices before takeoff
Replies: 18
Views: 2473

Re: Unplugging of devices before takeoff

There is a 'no break power transfer' feature on Airbus aircraft, however the transfer is still quite noticeable by a momentary flickering of the displays in the cockpit (and cabin lights) and a 'clonk' sound. Are you sure about the NBPT on older Airbus? I've never worked on Airbus, so I don't know....

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by Horstroad
Fri Aug 30, 2019 3:16 pm
Forum: Technical/Operations
Topic: Telescoping Control Columns
Replies: 68
Views: 6568

Re: Telescoping Control Columns

I absolutely agree that force feedback is important. It's also a technology that has been available for computer joysticks for decades now. Obviously aviation manufacturers have to make sure it will hold up to the usage/standards of a commercial airplane (though I think gamers probably abuse them m...

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by Horstroad
Thu Aug 29, 2019 7:26 pm
Forum: Technical/Operations
Topic: Telescoping Control Columns
Replies: 68
Views: 6568

Re: Telescoping Control Columns

The main advantage of a yoke is having leverage to exert more force if manual reversion is needed. Since all new designs are fully fly by wire, that is not needed, so I don't know what Boeing's argument will be (and I'm a Boeing fan usually). Boeing incorporates force feedback in their FBW aircraft...

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by Horstroad
Fri Aug 16, 2019 2:52 pm
Forum: Technical/Operations
Topic: What type of insurance do airlines carry?
Replies: 7
Views: 3650

Re: What type of insurance do airlines carry?

here is an insurance coverage example for a wide body aircraft: Combined single limit USD 1,400,000,000.00 any one aircraft / any one occurrence including: 700.000.000.00 for aircraft third party legal liability (bodily injury and property damage) 250,000.00 per passenger for bodily injury 4,700.00 ...

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by Horstroad
Mon Jul 22, 2019 11:46 pm
Forum: Technical/Operations
Topic: Pack/air cycle machine
Replies: 4
Views: 3976

Re: Pack/air cycle machine

The heat exchangers are not part of the ACM. The ACM is only the compressor/turbine assembly. Some aircraft only use one heat exchanger. "Heat exchangers in aircraft can be used to heat fuel, cool oil, and cool other fluids. When two fluids of different temperatures come in contact with each ot...

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by Horstroad
Sat Jul 20, 2019 10:36 am
Forum: Technical/Operations
Topic: Fuel Quantity indication and unusable fuel
Replies: 5
Views: 2230

Re: Fuel Quantity indication and unusable fuel

Thanks a lot for your replies.

Is there an actual FAA or EASA regulation? As said above all I could find was the definition of unusable fuel, nothing about the fact that it must not be indicated.

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by Horstroad
Fri Jul 19, 2019 8:57 pm
Forum: Technical/Operations
Topic: Fuel Quantity indication and unusable fuel
Replies: 5
Views: 2230

Fuel Quantity indication and unusable fuel

Today I read about an incident when an A320 arrived at its destination with only 260kg of fuel remaining. http://avherald.com/h?article=4ca8397f&opt=0 I was wondering how much of that was actually usable fuel. One user commented that all of that is usable fuel as only usable fuel is indicated on...

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by Horstroad
Sat Jul 06, 2019 6:45 am
Forum: Technical/Operations
Topic: 777 Cabin Temperature Controllers (CTC)
Replies: 1
Views: 1375

Re: 777 Cabin Temperature Controllers (CTC)

The CTCs control air flow into the air conditioning packs and control the mix manifold temperature.

Image

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by Horstroad
Mon Jul 01, 2019 6:39 pm
Forum: Technical/Operations
Topic: Apu overheat protective shutdown in flight
Replies: 4
Views: 1961

Re: Apu overheat protective shutdown in flight

You should ask the FIM, not an online forum :D

An APU shuts down due to overheat, when the EGT reaches its limits. Maybe it's a faulty EGT thermocouple or a fault in the wiring.

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by Horstroad
Tue Jun 25, 2019 10:45 pm
Forum: Technical/Operations
Topic: Individual Wheel Load
Replies: 9
Views: 2186

Re: Individual Wheel Load

The NLG usually takes about 10% of the load. So on a 737 MAX 9 at MTOW there would be about 4.5-5t on each nose wheel and 20t on each main wheel. An empty 777F has 7.7t on each nose wheel and an average of 11.8t on each main wheel. Your link to the article doesn't work edit: Have a look at this: htt...

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by Horstroad
Sat Jun 01, 2019 7:54 pm
Forum: Technical/Operations
Topic: Aircraft tilting back on ground due to weight imbalance
Replies: 25
Views: 5241

Re: Aircraft tilting back on ground due to weight imbalance

All our books refer to #1, #2, #3, upper aux, lower aux & tail tank. As I recall, the #2 tank is split between the left and right wings and connected by plumbing. I could be mistaken in that, but that configuration sticks in my mind. Exactly. Never heard it described as such? Is this a MD term ...

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by Horstroad
Sat Jun 01, 2019 1:14 pm
Forum: Technical/Operations
Topic: Aircraft tilting back on ground due to weight imbalance
Replies: 25
Views: 5241

Re: Aircraft tilting back on ground due to weight imbalance

We do not use tail stands on the MD11 The MD11 doesn't have a jack fitting in the tail to support a tail stand. Some airlines use concrete blocks on the nose landing gear to keep it from tilting. Usually It's not necessary if you follow the correct order. At first the forward lower cargo compartmen...

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by Horstroad
Thu May 23, 2019 5:06 am
Forum: Technical/Operations
Topic: Why are the APU GEN & APU BLEED usually left on?
Replies: 11
Views: 3395

Re: Why are the APU GEN & APU BLEED usually left on?

The MD11 is an exception again... as always. APU bleed and power are off after APU start. At least if you start the APU with the dedicated APU start/stop pushbutton. However The APU automatically starts when the APU PWR pushbutton is pressed and in this case the APU takes over the main AC busses whe...

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by Horstroad
Fri May 17, 2019 9:53 pm
Forum: Technical/Operations
Topic: Seat change - forced
Replies: 19
Views: 4124

Re: Seat change - forced

So how did you know which seat to sit in? Did they really change your seat or did you just sit somewhere else? The passenger who was sitting in my seat told me which seat they were originally sitting in. My original seat was 2A, the seat they were originally in was 11B. Sounds like that passenger j...

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