Search found 623 matches

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by Horstroad
Mon Jan 10, 2022 4:08 pm
Forum: Technical/Operations
Topic: DC-10 tail mounted engine angle
Replies: 9
Views: 1902

Re: DC-10 tail mounted engine angle

The inlet duct has indeed an angle of about 2° to follow the shape of the fuselage. The engine itself however is mounted horizontally level. edit: As you can see here there is a 2.5° angle between the inlet duct centerline and horizontal and again a 2.5° angle between the inlet duct centerline and t...

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by Horstroad
Thu Jan 06, 2022 11:58 pm
Forum: Technical/Operations
Topic: Source of bleed air (CFM engine)?
Replies: 4
Views: 912

Re: Source of bleed air (CFM engine)?

The "intermediate" probably refers to the pneumatic system. Usually three pressure values are important for pressure regulation. PE (Engine Pressure), PI (Intermediate Pressure) and PM (Manifold Pressure). The engine pressure sensor sits upstream of the high stage valve, so it's the HPC ai...

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by Horstroad
Sat Dec 25, 2021 9:46 am
Forum: Technical/Operations
Topic: Altimeters, static pressure, and lift
Replies: 48
Views: 2549

Re: Altimeters, static pressure, and lift

An interesting question and I had to think about it for a few minutes. The static pressure component of the total air pressure changes only when you compare pressure values before and after you have accelerated the air, e.g. infront of and right on top of the wing. This drop in static pressure in co...

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by Horstroad
Wed Dec 22, 2021 12:16 am
Forum: Technical/Operations
Topic: Airspeed lost
Replies: 11
Views: 1396

Re: Airspeed lost

I don’t think you can get an A319 to do 320kts IAS at FL390 The Airbus protections would prevent the overspeed. There is no way to have the aircraft to reach that speed using autothrust with the autopilot engaged. The maximum indicated airspeed of an A319 at FL390 is 250kts at M0.82 indicated. The ...

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by Horstroad
Sat Dec 18, 2021 4:50 pm
Forum: Technical/Operations
Topic: Blue Hydraulic Pump/System in an Airbus? How does it work?
Replies: 3
Views: 1316

Re: Blue Hydraulic Pump/System in an Airbus? How does it work?

I don't think the question is Airbus specific or even axial piston pump specific, but rather a question of the basic principles of hydraulic power. If I understand your question correctly you're concerned about the fluid trapped in the cylinder on the pressurized (red) side being rotated around to t...

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by Horstroad
Fri Dec 17, 2021 10:47 am
Forum: Technical/Operations
Topic: 737 MAX APU Inlet Door
Replies: 30
Views: 3514

Re: 737 MAX APU Inlet Door

In my aircraft you never operate the APU inflight unless you need it for non-normals, relight, hydraulic pressure, electric power, etc. What aircraft has an APU that produces hydraulic pressure? For the original question I guess they changed the design to reduce drag and increase fuel efficiency. A...

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by Horstroad
Tue Dec 14, 2021 7:37 pm
Forum: Technical/Operations
Topic: Which airliners have two jackscrew assemblies to control their horizontal stabilizer?
Replies: 7
Views: 1286

Re: Which airliners have two jackscrew assemblies to control their horizontal stabilizer?

How do these multiple jacks operate then if one hydraulic system goes down - with a jackscrew being irreversible? Unless they're placed in series (one after another) I guess, rather than in parallel (side by side) as you'd expect I can't see how they'd work. On the MD-11 the two nuts are connected ...

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by Horstroad
Mon Dec 13, 2021 11:21 am
Forum: Technical/Operations
Topic: "...low cycle fatigue fracture of a torque tube"?
Replies: 7
Views: 958

Re: "...low cycle fatigue fracture of a torque tube"?

You are right that there is a separate torque tube inside the ACME screw

Any of these commands activates one of the two
electric motors that rotate the acme screw by applying torque to the titanium torque tube
that is held fixed inside the acme screw
.

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by Horstroad
Mon Dec 13, 2021 12:39 am
Forum: Technical/Operations
Topic: "...low cycle fatigue fracture of a torque tube"?
Replies: 7
Views: 958

Re: "...low cycle fatigue fracture of a torque tube"?

Addenum. I think from the information on the diagram and description on page 15 that the torque tube is inside the acme screw. It is said to be made of titanium. The acme screw was recovered after the accident. Still not clear on how the fracture of the torque tube led to the fatal dive. The ACME s...

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by Horstroad
Sat Dec 04, 2021 10:00 am
Forum: Technical/Operations
Topic: Teal Color Inside A320neo Pratt & Whitney Engines
Replies: 27
Views: 5439

Re: Teal Color Inside A320neo Pratt & Whitney Engines

StereoTechque wrote:
The black inlet cowl also has visible holes on surface for Accoustic dampening.

The entire bypass duct is perforated for noise reduction.

Image

But that's the same on all modern engines

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by Horstroad
Sat Dec 04, 2021 9:18 am
Forum: Technical/Operations
Topic: Teal Color Inside A320neo Pratt & Whitney Engines
Replies: 27
Views: 5439

Re: Teal Color Inside A320neo Pratt & Whitney Engines

I was really surprised that posters were suggesting that the teal liner was an attrition/abradable lining. As you point out, the teal material extends many inches ahead of the fan. So it's not that, folks! Yes, it is. No It's not :P https://i.postimg.cc/MK30WrtC/5961041-2.jpg

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by Horstroad
Fri Dec 03, 2021 5:58 pm
Forum: Technical/Operations
Topic: Teal Color Inside A320neo Pratt & Whitney Engines
Replies: 27
Views: 5439

Re: Teal Color Inside A320neo Pratt & Whitney Engines

So back to OP's question? Why blue? Does it also have acoustic dampening properties (perforations, etc.) as the differently colored lining ahead of it? It's a honeycomb core panel with a perforated face sheet. Its purpose is noise reduction. The color is probably just the base color of the epoxy ma...

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by Horstroad
Fri Dec 03, 2021 4:55 pm
Forum: Technical/Operations
Topic: "THR CLB" v. "THR LVR"?
Replies: 16
Views: 2145

Re: "THR CLB" v. "THR LVR"?

LVR is an abbreviation for "Lever". The Airbus thrust lever does not have a LVR or "lower" detent. There is a TO/GA detent for Maximum Take Off or Go-Around. There is a FLX/MCT detent for Maximum Continuous Thrust or Flex Take Off and there is a CL detent for Climb Thrust. Thrust...

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by Horstroad
Fri Dec 03, 2021 3:49 pm
Forum: Technical/Operations
Topic: Teal Color Inside A320neo Pratt & Whitney Engines
Replies: 27
Views: 5439

Re: Teal Color Inside A320neo Pratt & Whitney Engines

The Fan Blade Rubstrip (or Abradable Shroud or Attrition Lining or whatever they're called by other manufacturers) is in the plane of the fan blades. In the pictures of that PW1000G series engines it would be the light gray ring behind the teal colored ring. The teal colored ring should be acoustic ...

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by Horstroad
Thu Nov 25, 2021 10:39 am
Forum: Technical/Operations
Topic: Restrictions on #2 Thrust Reverse L1011/DC10/MD11
Replies: 20
Views: 2846

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

I’m just wondering what the lockout prodcedure is for an MD-11. I remember on a 767. Installing 3 red lock plates on the outside of the trans cowl and flipping and installing a locking square drive in the center drive unit It's the same. Additionally you have to disconnect the electrical connector ...

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by Horstroad
Sat Nov 13, 2021 1:42 am
Forum: Technical/Operations
Topic: Why fuel driven actuators?
Replies: 14
Views: 1762

Re: Why fuel driven actuators?

The engines can't run without fuel. They can run without hydraulics...

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by Horstroad
Wed Nov 03, 2021 4:01 pm
Forum: Technical/Operations
Topic: Use of rudder in commercial aircraft
Replies: 18
Views: 2215

Re: Use of rudder in commercial aircraft

On the 777 Thrust Asymmetry Compensation is a protection function of the Primary Flight Computer operating in Normal Mode. It starts to operate when the CAS is >70kt, the reversers are not commanded deployed, and the thrust difference between the engines is at least 6000lb. TAC is limited to 60% of ...

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by Horstroad
Wed Nov 03, 2021 12:50 am
Forum: Technical/Operations
Topic: Restrictions on #2 Thrust Reverse L1011/DC10/MD11
Replies: 20
Views: 2846

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

We didn't have such restrictions.

Funny thing is, if there was a stuck reverser or any other engine problem, there was a more than 1/3 chance it was #2. Not because of maintenance, #2 always got the same love as the others. She did it just because she could.

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by Horstroad
Mon Nov 01, 2021 2:59 am
Forum: Technical/Operations
Topic: Is it dangerous when aircraft carry fuel in a center tank beneath the passenger cabin?
Replies: 43
Views: 3540

Re: Is it dangerous when aircraft carry fuel in a center tank beneath the passenger cabin?

on planes that had/have the horizontal stabilizer tank, is that used primarily for feeding the APU? The primary purpose of the tail tank on most aircraft is for CG control. Secondary would be additional fuel storage space. On the MD-11 the APU shares the fuel feed line with the #2 engine. It has a ...

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by Horstroad
Wed Oct 27, 2021 8:07 pm
Forum: Technical/Operations
Topic: Duration of 747 Hydraulic Pressure Reduction?
Replies: 7
Views: 805

Re: Duration of 747 Hydraulic Pressure Reduction?

Aircraft that have flaps that are driven by actuators…the MD11 or DC8 come to mind…will have check valves and/or restrictors that prevent the flaps from drooping with loss of pressure. The MD-11 had the issue when you would pressurize the #2 hydraulic system without pressurizing the other two hydra...

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by Horstroad
Tue Oct 26, 2021 5:23 pm
Forum: Technical/Operations
Topic: UPS 747 takeoff without flap fairing
Replies: 23
Views: 3763

Re: UPS 747 takeoff without flap fairing

I figured it was the Preamble. The MMEL available on MBF doesn’t have that. I’ll have a peak at it at work tonight I never work with the MMEL, I think I never even had a proper look into it. There never was a need to. But I have an old copy of a MD-11 MMEL from '00 on hand and just skimmed through ...

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by Horstroad
Tue Oct 26, 2021 5:02 pm
Forum: Technical/Operations
Topic: Rather neat holes in 9V-SQJ
Replies: 5
Views: 1289

Re: Rather neat holes in 9V-SQJ

My guess is on plane tags. What I find more surprising is the fact that they didn't strip it of parts before scrapping, except for the engines and some cockpit windows. Thrust reversers still in place, slats still there... An old aircraft is usually worth more in parts than whole. If it was my aircr...

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by Horstroad
Tue Oct 26, 2021 4:51 pm
Forum: Technical/Operations
Topic: UPS 747 takeoff without flap fairing
Replies: 23
Views: 3763

Re: UPS 747 takeoff without flap fairing

But there's MEL 9.5 I don’t know what that is. It's the Preamble of the MEL. The section "Contents of the MEL" describes what is and isn't contained in the MEL and how it has to be treated when it isn't. For example Equipment obviously basic to airplane airworthiness such as wings, rudder...

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by Horstroad
Tue Oct 26, 2021 6:20 am
Forum: Technical/Operations
Topic: Is it dangerous when aircraft carry fuel in a center tank beneath the passenger cabin?
Replies: 43
Views: 3540

Re: Is it dangerous when aircraft carry fuel in a center tank beneath the passenger cabin?

The center wing tanks usually are the largest. On the 777 (-200LR/-F/-300ER) for example the center tank holds 184,480lb and the wing tanks 69,630lb each. I think some early versions of the 777 didn't use the space in the center wing box for fuel. The two compartments of the center tank in the wings...

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by Horstroad
Tue Oct 26, 2021 5:38 am
Forum: Technical/Operations
Topic: UPS 747 takeoff without flap fairing
Replies: 23
Views: 3763

Re: UPS 747 takeoff without flap fairing

Something tells me a savvy airline would in particular leave spares of such parts at their, ahem, "more exotic" outstations. (Also, can you really not defer the flush handle but you *can* defer the entire lav? How amusing.) The way it would probably be handled by our maintenance control f...

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by Horstroad
Fri Oct 22, 2021 2:02 am
Forum: Technical/Operations
Topic: Could MD-11's used domestically do without the winglets?
Replies: 31
Views: 3332

Re: Could MD-11's used domestically do without the winglets?

Is there even a CDL for that? I know you can for 330/340, 747 and most others with wingtip devices. But my MD11 work was entirely powerplant, so I am a little curious about that. There's a CDL for the lower winglet only, but not for the whole winglet assembly. The lower winglets removed add a fuel ...

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by Horstroad
Thu Oct 21, 2021 10:38 pm
Forum: Technical/Operations
Topic: Could MD-11's used domestically do without the winglets?
Replies: 31
Views: 3332

Re: Could MD-11's used domestically do without the winglets?

The Winglet can't just be removed. While there is a removal/installation task in the AMM for the winglet assembly, it's actually the removal/installation of the whole wing tip. You would need a replacement wing tip to put in its place which would result in some (understatement) paperwork as the MD-1...

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by Horstroad
Sat Oct 16, 2021 6:24 pm
Forum: Technical/Operations
Topic: Question For the Mechanics: Which Commercial Aircraft Have Been Easiest and Most Difficult For You to Work On?
Replies: 71
Views: 13431

Re: Question For the Mechanics: Which Commercial Aircraft Have Been Easiest and Most Difficult For You to Work On?

Way more problems with the hydraulic lines. Those production swages let go all the time. Replace every failed swage fitting with a Rynglok fitting and it will survive the rest of the aircraft. What an amazing and easy to use system. It's fantastic as a torturing tool - going into the stabilizer com...

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by Horstroad
Tue Sep 28, 2021 7:46 pm
Forum: Technical/Operations
Topic: Personal items left onboard American Airlines flight
Replies: 10
Views: 2375

Re: Personal items left onboard American Airlines flight

The cleaning crew will find the item, note the seat number, and hand it over to someone at the gate. They'll either make an announcement or, if it's a valuable item like a laptop and you've already left the airport like an idiot, they'll call you. Unfortunately, I've done this a couple of times. It...

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by Horstroad
Tue Sep 28, 2021 7:31 pm
Forum: Technical/Operations
Topic: Question For the Mechanics: Which Commercial Aircraft Have Been Easiest and Most Difficult For You to Work On?
Replies: 71
Views: 13431

Re: Question For the Mechanics: Which Commercial Aircraft Have Been Easiest and Most Difficult For You to Work On?

Troubleshooting the PACK's on MD10/11's are always a fun time! Really? I haven't had many issues with the MD-11. The heat exchanger cracks a lot... but I guess that's a common issue for all aircraft. The 777 has it as well. Sometimes the ACM fails... but I don't recall anything that took some big b...

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by Horstroad
Mon Sep 06, 2021 7:16 am
Forum: Technical/Operations
Topic: Freighter VS Passenger variants.
Replies: 8
Views: 1832

Re: Freighter VS Passenger variants.

due to not having seats and other things Freighters aren't just empty. The cargo handling system weighs quite a bit. Also some freighter versions have reinforced floors compared to the passenger versions, like the B777. Some need additional structure to make it work, like the A330 on the nose landi...

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by Horstroad
Sun Sep 05, 2021 9:20 am
Forum: Technical/Operations
Topic: What are the pros/cons of various airliner types to the situation of runaway trim and manual trimming?
Replies: 7
Views: 920

Re: What are the pros/cons of various airliner types to the situation of runaway trim and manual trimming?

The A330 and A350 have no backup in case of complete hydraulic failure. I just looked into the B777 and there's no electric backup either. It's similar to the MD-11. Actually it's almost the same setup except for the hydraulic shutoff controlled by the cutout switches. The alternate trim levers are...

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by Horstroad
Sat Sep 04, 2021 9:05 pm
Forum: Technical/Operations
Topic: What are the pros/cons of various airliner types to the situation of runaway trim and manual trimming?
Replies: 7
Views: 920

Re: What are the pros/cons of various airliner types to the situation of runaway trim and manual trimming?

On the Boeing’s, you stop a runaway trim by flipping the Stab Trim cutout switches. This kills hydraulic power to the stab motors. Then you trim with the alternate trim, which is an electric trim. When I get to work, I’ll see what Airbus and Douglas did, but I can’t imagine it’s much different. On ...

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by Horstroad
Mon Aug 30, 2021 4:28 pm
Forum: Technical/Operations
Topic: Question about cockpit audio warning
Replies: 8
Views: 1224

Re: Question about cockpit audio warning

The MD-11 (and probably other MDs as well) is quite talkative. The possible aural warnings are as follows: Bell Clacker Horn C-Chord Warbler 1.2, 1.5, 2.9, 7.8 kHz Chime Advisory Tone Abnormal Tone Emergency Tone "Engine 1 Fire" "Engine 2 Fire" "Engine 3 Fire" "Hea...

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by Horstroad
Mon Aug 30, 2021 3:57 pm
Forum: Technical/Operations
Topic: Size of speed brakes[spoilers] on airliners?
Replies: 14
Views: 1876

Re: Size of speed brakes[spoilers] on airliners?

Do you know why they have to delay the full deployment? Because I thought that if they were to be deployed fully right away, the increased drag would probably reduce the landing distance I can only guess. To my understanding the main purpose of the ground spoilers is to destroy most of the lift aft...

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by Horstroad
Sat Aug 28, 2021 11:04 am
Forum: Technical/Operations
Topic: Size of speed brakes[spoilers] on airliners?
Replies: 14
Views: 1876

Re: Size of speed brakes[spoilers] on airliners?

I must say, I did not believe you for a second when you said the outboard spoilers were 2 feet, 3 inches tall. For comparison, the MD11 spoilers are 0.67m by 1.85m (26.5" x 73") for the outboard spoiler panels (4 on each wing) and 0.47m by 3.05m (18.5" x 120") for the inboard sp...

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by Horstroad
Wed Aug 25, 2021 6:35 pm
Forum: Technical/Operations
Topic: Size of speed brakes[spoilers] on airliners?
Replies: 14
Views: 1876

Re: Size of speed brakes[spoilers] on airliners?

On the 777, not only do they all deploy at different times, but there's the one spoiler panel on each wing that deploys at a smaller angle compared to the rest. I wonder how they determine that. I can't tell you what they were thinking... but the spoiler/speedbrake schedule is actually quite wild o...

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by Horstroad
Tue Aug 24, 2021 9:37 pm
Forum: Technical/Operations
Topic: Absence of large manual pitch trim wheels on non-Boeing jetliners.
Replies: 9
Views: 1678

Re: Absence of large manual pitch trim wheels on non-Boeing jetliners.

But, there is no direct link to the drive system. On the 8 there were alternate trim switches that drove an electric motor. I assume the later aircraft are the same…I’ll check the AMM on the MD11 later tonight. The suitcase handles on the MD-11 are directly connected to the primary trim control val...

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by Horstroad
Thu Aug 12, 2021 3:19 pm
Forum: Technical/Operations
Topic: Question For the Mechanics: Which Commercial Aircraft Have Been Easiest and Most Difficult For You to Work On?
Replies: 71
Views: 13431

Re: Question For the Mechanics: Which Commercial Aircraft Have Been Easiest and Most Difficult For You to Work On?

DL_Mech wrote:
The LAMM is a great manual. Just remember that it is not an updated manual to be used on the aircraft. :D

But there's the SSM which is an updated manual. It's 100% the LAMM, but digital and maintained by Boeing. Last revision date is 15 Jul 2021.

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by Horstroad
Fri Aug 06, 2021 11:40 am
Forum: Technical/Operations
Topic: Question For the Mechanics: Which Commercial Aircraft Have Been Easiest and Most Difficult For You to Work On?
Replies: 71
Views: 13431

Re: Question For the Mechanics: Which Commercial Aircraft Have Been Easiest and Most Difficult For You to Work On?

Don't forget to pull the fire bottle CBs if a 777 is left unpowered overnight... Yeah another great feature What happens if you are doing maintenance on a big jet and you happen to get "stuck" - like a system not behaving as expected, or a maintenance manual that gives unclear instruction...

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by Horstroad
Thu Aug 05, 2021 3:20 pm
Forum: Technical/Operations
Topic: Question For the Mechanics: Which Commercial Aircraft Have Been Easiest and Most Difficult For You to Work On?
Replies: 71
Views: 13431

Re: Question For the Mechanics: Which Commercial Aircraft Have Been Easiest and Most Difficult For You to Work On?

Most difficult......hands down.... The DC-8 The overall engineering design of the aircraft was just bad. The DC-10/MD-10/MD-11/KC-10 and the DC-9 closely follow the -8 The easiest has to be the 777. Completely mechanic friendly, you just need a ladder for EVERYTHING. Depends. Lubrication for exampl...

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by Horstroad
Sat Jul 31, 2021 8:11 pm
Forum: Technical/Operations
Topic: MD-11: Two types of outboard flap tracks fairings
Replies: 9
Views: 1295

Re: MD-11: Two types of outboard flap tracks fairings

Actually those are flap hinge fairings. The MD-11 flaps don't run on tracks* driven by ball screws like they do on the Boeings and Airbusses. The flaps are hinged at the lower part of those fairings. There's a hydraulic actuator in each of these fairings that drives the flaps during retraction and e...

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by Horstroad
Tue Jul 27, 2021 1:36 pm
Forum: Technical/Operations
Topic: SOP flap/slat movement on the DC-10
Replies: 21
Views: 1714

Re: SOP flap/slat movement on the DC-10

The flap handle (ok, technically I think it's the slat handle, but so long as the flap and slat handles are connected together in their normal config, let's consider it as one handle) does indeed drop into the detents, but it's not procedure to move the Dial-A-Flap selector while the flap/slat handl...

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by Horstroad
Fri Jul 23, 2021 8:52 pm
Forum: Technical/Operations
Topic: SOP flap/slat movement on the DC-10
Replies: 21
Views: 1714

Re: SOP flap/slat movement on the DC-10

The DC-10 pic you have is of a DC10-40 which would have been a NW aircraft. That is a very different set up than all the other operators. That's the only clear photograph of a DC-10 flap handle I could find online. Does anyone have one of the regular config? With regard to the Dial-A-Flap, the sele...

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by Horstroad
Thu Jul 22, 2021 6:34 pm
Forum: Technical/Operations
Topic: SOP flap/slat movement on the DC-10
Replies: 21
Views: 1714

Re: SOP flap/slat movement on the DC-10

The DC-10 Slats are pretty much the same thing, with the exception of the gap for the pylon. The dial a flap was an actual serrated wheel aft of the flap/slat lever. https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Fi1.wp.com%2Fairwaysmag.com%2Fwp-content%2Fuploads%2F2016%2F08%2Fmd-80-ped...

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by Horstroad
Tue Jun 29, 2021 10:53 am
Forum: Technical/Operations
Topic: Lightning Strike on 777
Replies: 17
Views: 3675

Re: Lightning Strike on 777

it hit the middle of the wing, so I don't know if there has to be any inspections or anything. An inspection is always required. The damage has to be documented and assessed and repaired if required. On the 777 the lightning strike inspection consists of two phases. Phase two can be deferred for up...

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by Horstroad
Thu Jun 17, 2021 4:46 pm
Forum: Technical/Operations
Topic: Cargo doors open inward or outward
Replies: 26
Views: 4139

Re: Cargo doors open inward or outward

extender wrote:
Main deck

Thanks. I missed that detail.

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by Horstroad
Wed Jun 16, 2021 1:33 am
Forum: Technical/Operations
Topic: Cargo doors open inward or outward
Replies: 26
Views: 4139

Re: Cargo doors open inward or outward

In 26 years of Handling in one way or another, all I can remember is that all the main cargo doors on wide body’s open outwards. Some Electras had the door that opened like a 767/DC-10/L-1011 pax door. Where did theses doors go? On the main deck the pax doors disappear in the ceiling. But on the lo...

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by Horstroad
Tue Jun 08, 2021 1:23 pm
Forum: Technical/Operations
Topic: Cargo doors open inward or outward
Replies: 26
Views: 4139

Re: Cargo doors open inward or outward

Then again you could theoretically built cargo doors to operate similar to the doors I suppose. Being slotted in place to make a plug type door while still opening outwards. Does any aircraft do this? Hmm... The B777 aft cargo door can be ordered in two variations. The large aft cargo door is basic...

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