Search found 504 matches

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by Horstroad
Tue May 26, 2020 1:43 pm
Forum: Technical/Operations
Topic: 747-400 elevator control system
Replies: 13
Views: 1119

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: 1257

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: 1257

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: 4110

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: 3838

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: 6
Views: 2118

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: 7638

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: 2772

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: 1085

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: 2398

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: 5988

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: 5988

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: 3549

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: 2342

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: 1993

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: 1993

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: 1286

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: 1827

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: 1740

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: 4421

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: 4421

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: 3071

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: 3954

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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by Horstroad
Fri May 17, 2019 8:51 pm
Forum: Technical/Operations
Topic: Engine failure question
Replies: 46
Views: 4712

Re: Engine failure question

Now that's something I never thought I'd see. An airliner with fuel system more convoluted than the A330s. :D "The fuel system in the A330 was obviously designed by a lunatic" - Technical school instructor. If this stuff turns you on, you can click on the image to see the complete schemat...

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by Horstroad
Thu May 16, 2019 10:21 pm
Forum: Technical/Operations
Topic: Engine failure question
Replies: 46
Views: 4712

Re: Engine failure question

On ground you can transfer from/to anywhere without leaving the cockpit just using the MCDU which is very convenient." Is this an aproved flight crew procedure, or one of this closely guarded secrets that maintenance uses? It's a maintenance thing... but not a secret :D Enter the CFDS -> LRU m...

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by Horstroad
Thu May 16, 2019 7:41 pm
Forum: Technical/Operations
Topic: Engine failure question
Replies: 46
Views: 4712

Re: Engine failure question

In general, you can't transfer from tank to tank, since most airliners don't have pumps that can transfer from tank to tank Not particularly on-topic... but as you brought it up... On the MD11 you can transfer fuel from one tank to the other even in flight and it's actually normal procedure. The ai...

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by Horstroad
Tue May 14, 2019 1:53 am
Forum: Technical/Operations
Topic: Seat change - forced
Replies: 19
Views: 3954

Re: Seat change - forced

It might be that a frequent flyer with a high status checked in late and requested an aisle seat, so the person on the check in desk gave them your seat. Or maybe there was something wrong with your seat. Maybe the entertainment didn't work or the recline function, so they blocked the seat and gave ...

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by Horstroad
Thu May 02, 2019 2:33 pm
Forum: Technical/Operations
Topic: Hypothetical Question about MD-11
Replies: 12
Views: 2217

Re: Hypothetical Question about MD-11

GalaxyFlyer wrote:
It could be two-engine ferried, crew only.

A specially trained crew that is. None of our pilots are certified to perform such a ferry flight. We always replace the engine, if necessary, instead of a ferry flight.

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by Horstroad
Sun Apr 28, 2019 8:53 am
Forum: Technical/Operations
Topic: DC10 door operation
Replies: 13
Views: 2740

Re: DC10 door operation

the door can be opened and closed manually with or without power as they are counterweighted. In an emergency (contrary to strfyr51's post) a compressed-air bottle is used to force them open. the door wasn't at all hard to open once you pulled it In, It did NOT require power to open 3. Manual. Last...

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by Horstroad
Sat Apr 27, 2019 4:37 pm
Forum: Technical/Operations
Topic: Size of fans on hypothetical A340neo
Replies: 33
Views: 3274

Re: Size of fans on hypothetical A340neo

Just because there's no accidents doesn't mean that profit should be before everything else. Obviously, as there are no incidents, the regulations and safety standards work and are not put behind profit. ETOPS isn't even cheap either. Neither for the manufacturer to certify, nor for the operator. D...

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by Horstroad
Sat Apr 27, 2019 3:09 pm
Forum: Technical/Operations
Topic: Size of fans on hypothetical A340neo
Replies: 33
Views: 3274

Re: Size of fans on hypothetical A340neo

Wasn't ETOPS just Boeing lobbying the FAA? If airlines and aviation really cared about safety, if they really put safety first, I don't think we would have ETOPS. That's a new one to me. Name me one incident where the aircraft operated under ETOPS regulations and anyone got hurt because the aircraf...

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by Horstroad
Wed Apr 24, 2019 4:51 pm
Forum: Technical/Operations
Topic: What are the chances that a single-engine pilot could land a 707?
Replies: 43
Views: 4954

Re: What are the chances that a single-engine pilot could land a 707?

The 707 is no 727 Other than the rudder, all primary flight controls are unpowered, it is pretty heavy on the controls and there’s quite a bit of lag There’s little clearance under the wings for the outboards so you’ll hit a pod unless your wings are almost level at touchdown Heavy, lots of inertia...

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by Horstroad
Wed Mar 20, 2019 1:14 pm
Forum: Technical/Operations
Topic: Boeing's FOD problem
Replies: 16
Views: 3184

Re: Boeing's FOD problem

- Every employee on the factory floor should have his/her own set of tools. When you have shared tools it is assured that there is an inspection for completeness at start and finish of each shift by two sets of eyes. With personal tools it es easier to keep quiet about a lost tool and replace it la...

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by Horstroad
Sun Jan 27, 2019 5:33 pm
Forum: Technical/Operations
Topic: Concorde economics vs. 787/A330/777/A321LR
Replies: 56
Views: 10854

Re: Concorde economics vs. 787/A330/777/A321LR

No, I'm saying you likely wouldn't be able to get something all-composite that'd be built with enough structure to maintain integrity in that kind of service profile, and yet not be so overbuilt (or require increasingly exotic materials as listed above) such as to be completely beyond both weight/c...

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by Horstroad
Tue Jan 15, 2019 7:19 pm
Forum: Technical/Operations
Topic: Most expensive aircraft part
Replies: 39
Views: 7992

Re: Most expensive aircraft part

Putting a limit on being Indivisible makes it difficult to discuss this. The section 41 composite barrel of the 787 is technically one piece once it comes out of the autoclave. Should we call that one part? Or do you want to say that it isn't because it's many multiples of carbon fiber tape? I woul...

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by Horstroad
Sun Jan 13, 2019 11:17 am
Forum: Technical/Operations
Topic: Weather radar panel on Boeing 777
Replies: 2
Views: 2056

Re: Weather radar panel on Boeing 777

TFR is for transfer. It lets you see exactly what the other guy sees. L R/T and R R/T (or L/R depending on the config) selects the Left or Right Receiver/Transmitter for operation CPT and F/O tilt and gain operate independently from each other. Antenna sweep from left to right updates the captains d...

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by Horstroad
Fri Jan 04, 2019 4:36 pm
Forum: Technical/Operations
Topic: Are toxic cabin fumes an underestimated risk, or not?
Replies: 73
Views: 6727

Re: Are toxic cabin fumes an underestimated risk, or not?

You misunderstood me. Or maybe I didn't express myself clear enough. If there was oil mist the coalescer bags would be able to filter it out. Anything else, not a chance. Of course there is no oil mist in the pneumatic system. If there is oil in the system it is vaporized. Vaporized oil, from those...

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by Horstroad
Thu Jan 03, 2019 1:35 am
Forum: Technical/Operations
Topic: Are toxic cabin fumes an underestimated risk, or not?
Replies: 73
Views: 6727

Re: Are toxic cabin fumes an underestimated risk, or not?

Then, the air usually will pass through a water separator coalescer or the sock. The sock retains the dirt and oil from the engine bleed air to keep the cabin air cleaner. The coalescer is not a proper filter. It is just a piece of cloth. Its function is to collect condensed water, not to filter th...

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by Horstroad
Wed Jan 02, 2019 9:07 pm
Forum: Technical/Operations
Topic: Are toxic cabin fumes an underestimated risk, or not?
Replies: 73
Views: 6727

Re: Are toxic cabin fumes an underestimated risk, or not?

Then, the air usually will pass through a water separator coalescer or the sock. The sock retains the dirt and oil from the engine bleed air to keep the cabin air cleaner. The coalescer is not a proper filter. It is just a piece of cloth. Its function is to collect condensed water, not to filter th...

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by Horstroad
Tue Jan 01, 2019 4:11 am
Forum: Technical/Operations
Topic: Are toxic cabin fumes an underestimated risk, or not?
Replies: 73
Views: 6727

Re: Are toxic cabin fumes an underestimated risk, or not?

Then, the air usually will pass through a water separator coalescer or the sock. The sock retains the dirt and oil from the engine bleed air to keep the cabin air cleaner. The coalescer is not a proper filter. It is just a piece of cloth. Its function is to collect condensed water, not to filter th...

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by Horstroad
Mon Dec 31, 2018 7:35 pm
Forum: Technical/Operations
Topic: Are toxic cabin fumes an underestimated risk, or not?
Replies: 73
Views: 6727

Re: Are toxic cabin fumes an underestimated risk, or not?

Ah, we're back to "fumes," that generic statement that could be anything...a scent, smoke in the cabin, anything. Smoke in the cabin could be an electrical fire, or any other number of sources. Yes a fume can be anything. But there are ovens that could stink on all aircraft. Yet these fum...

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by Horstroad
Mon Dec 31, 2018 4:02 pm
Forum: Technical/Operations
Topic: Are toxic cabin fumes an underestimated risk, or not?
Replies: 73
Views: 6727

Re: Are toxic cabin fumes an underestimated risk, or not?

I have the feeling that these events happen more often on A320 aircraft. There you go. We've gone from conspiracy sites and videos full of lies and misdirection to what you "feel" might be the case. Glad it's science based, because a scary feeling trumps all. Maybe rather than pushing the...

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by Horstroad
Sat Dec 29, 2018 5:41 pm
Forum: Technical/Operations
Topic: Such a Long Tail Cone You Have!
Replies: 14
Views: 5142

Re: Such a Long Tail Cone You Have!

Possibly off-topic, but what is the purpose of the spring-loaded hatch near the bottom of the photo? That seems like an awful lot of resistance to overcome just to inspect something, but on the other hand you'd never have to wonder if it closed tight after you were done. Those are overpressure vent...

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by Horstroad
Sat Dec 29, 2018 5:37 pm
Forum: Technical/Operations
Topic: Are toxic cabin fumes an underestimated risk, or not?
Replies: 73
Views: 6727

Re: Are toxic cabin fumes an underestimated risk, or not?

The APU is rarely, if ever, run in flight. The scent is not the same as "fumes" and aerotoxic syndrome, nor is overservice a standard, common thing, nor something that becomes an issue enroute on flights, and in most aircraft, there's no path from hydraulics to pneumatics. But it is run o...

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by Horstroad
Sat Dec 29, 2018 2:21 pm
Forum: Technical/Operations
Topic: Such a Long Tail Cone You Have!
Replies: 14
Views: 5142

Re: Such a Long Tail Cone You Have!

which had two kinks in it Can you explain this a little bit more (or perhaps a diagram)? https://img.picload.org/image/dcclwpcr/apuexhaustduct.jpg https://img.picload.org/image/dcclwoll/dsc_0131.jpg I don't know why the photo is on its side... it should be rotated 90° to the right I find the MD11 A...

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by Horstroad
Fri Dec 28, 2018 11:46 pm
Forum: Technical/Operations
Topic: Are toxic cabin fumes an underestimated risk, or not?
Replies: 73
Views: 6727

Re: Are toxic cabin fumes an underestimated risk, or not?

The APU has no hydraulics attached. And yes, I do know the MD11 well. Have you read what I wrote? I never said the APU has any Hydraulic components attached. But when the APU ingests any fluid... deicing fluid or engine oil or hydraulic fluid, this can contaminate the cabin air. The smell sticks to...

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by Horstroad
Fri Dec 28, 2018 10:43 pm
Forum: Technical/Operations
Topic: Are toxic cabin fumes an underestimated risk, or not?
Replies: 73
Views: 6727

Re: Are toxic cabin fumes an underestimated risk, or not?

https://www.avherald.com/h?article=4b6eb830/0006&opt=0 This article says it all. Oil, hydraulic fluid or whatever are all pretty toxic. You wouldn't want them to be on your skin for too long, let alone vaporize and inhale. How do you suppose hydraulic fluid gets into the cabin atmosphere? throu...

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by Horstroad
Fri Dec 28, 2018 7:08 pm
Forum: Technical/Operations
Topic: Are toxic cabin fumes an underestimated risk, or not?
Replies: 73
Views: 6727

Re: Are toxic cabin fumes an underestimated risk, or not?

abies111 wrote:
https://www.avherald.com/h?article=4b6eb830/0006&opt=0

This article says it all.
Oil, hydraulic fluid or whatever are all pretty toxic. You wouldn't want them to be on your skin for too long, let alone vaporize and inhale.

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by Horstroad
Wed Dec 19, 2018 5:26 pm
Forum: Technical/Operations
Topic: What would have made the MD11 safer?
Replies: 127
Views: 13402

Re: What would have made the MD11 safer?

( Landing speed of the Shuttle Orbiter ? :-) 185 to 196knots , looked it up :-) Not true, I flew it for 12 yrs. At Max Ldg Wgt Vapp was 168kts. If you mean some abnormal config like no flaps it was 186 best I remember. The Shuttle or the MD11? Because if you want to go extreme with two engines inop...

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