Search found 7594 matches

by fr8mech
Fri Jun 14, 2019 4:24 pm
Forum: Non-Aviation
Topic: Lawn mowers: Gas vs. electric
Replies: 32
Views: 1190

Re: Lawn mowers: Gas vs. electric

You know, mowers just aren't made like they used to be. My first mower was a Craftsman self-propelled that I bought almost 30 years ago. It lasted 12 years, and really could have lasted longer, but I neglected it for the last few years. Now, I'm on my 3rd mower (Lawn Boy, Husqvarna & Troybilt) i...

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by fr8mech
Mon Jun 10, 2019 10:15 pm
Forum: Technical/Operations
Topic: Physial design of control of 737 jackscrew
Replies: 16
Views: 1677

Re: Physial design of control of 737 jackscrew

I can’t imagine it’s much different than a B727. The motor had a clutch that engaged when the trim was engaged electrically. When electrically inactive, the clutch was ‘off’ and the manual trim wheel could be used. I can’t recall how manually trimming, using the wheel, disengaged the electric clutch.

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by fr8mech
Sat Jun 08, 2019 8:56 pm
Forum: Technical/Operations
Topic: Prevalence of Ground Electric Power Supply
Replies: 10
Views: 1453

Re: Prevalence of Ground Electric Power Supply

If the airport can handle transport category aircraft there is almost always ground electrical power available. If there are no jet ways then there is an FBO that has a ground power electric cart that does 440v. Those carts are everywhere. Now an air start cart could be a little hard to find at a r...

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by fr8mech
Tue Jun 04, 2019 12:11 am
Forum: Technical/Operations
Topic: Flight tomorrow mid-day delayed for maintenance
Replies: 3
Views: 1080

Re: Flight tomorrow mid-day delayed for maintenance

59 minutes seems pretty specific. Sounds regulatory, which typically means a flight crew problem. But, it’s posted as maintenance, so a small mystery. I know that if I was going to give an estimate for some scheduled maintenance, I would round up to the nearest 15 mins based on the programmed time f...

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by fr8mech
Mon Jun 03, 2019 11:01 am
Forum: Technical/Operations
Topic: Why retract flaps on the ground?
Replies: 51
Views: 6552

Re: Why retract flaps on the ground?

zanl188 wrote:
Flaps up recommended after landing on some aircraft to kill lift and add weight to wheels - enhances braking.


Ummm, no. That would be spoilers.

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by fr8mech
Sat Jun 01, 2019 6:54 pm
Forum: Technical/Operations
Topic: Aircraft tilting back on ground due to weight imbalance
Replies: 25
Views: 3336

Re: Aircraft tilting back on ground due to weight imbalance

Never heard it described as such? Is this a MD term or some tribal terminology? The MD11 aux tank I have seen were forward of the Center tank and had dedicated boost pump. Each held about 13,500# as I recall. All our books refer to #1, #2, #3, upper aux, lower aux & tail tank. As I recall, the ...

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by fr8mech
Sat Jun 01, 2019 4:50 pm
Forum: Technical/Operations
Topic: Aircraft tilting back on ground due to weight imbalance
Replies: 25
Views: 3336

Re: Aircraft tilting back on ground due to weight imbalance

Can you describe the "upper aux tank" as I have never heard it described as such? It’s the large fuel tank that sits just above the Lower Aux Tank. :smile: Seriously, it, with the Lower Aux, makes up what Boeing would call the Center Tank. It’s the tank that fuel is transferred to/from, i...

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by fr8mech
Fri May 31, 2019 9:20 am
Forum: Non-Aviation
Topic: Comfy, cushioned, long-lasting athletic socks
Replies: 8
Views: 657

Re: Comfy, cushioned, long-lasting athletic socks

Yeah...cushioned socks for athletic use? See, cushioned implies thick and cottony. That means they get, shall we say, "moist" and they stay "moist" (yeah, yeah, yeah...gross).

I use Swiftwick, the wife prefers Balega. I know folks that swear by Feetures, but I didn't like them.

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by fr8mech
Thu May 30, 2019 11:50 pm
Forum: Technical/Operations
Topic: Aircraft tilting back on ground due to weight imbalance
Replies: 25
Views: 3336

Re: Aircraft tilting back on ground due to weight imbalance

This does not happen often...in fact, it's rare, given the amount of aircraft and movements out there. I've been in the cargo business 30+ years, and not one of my operator's aircraft have tipped due to a loading issue. We do not use tail stands on the MD11, or the B757/B767 aircraft. We do on the A...

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by fr8mech
Thu May 23, 2019 8:02 am
Forum: Technical/Operations
Topic: Why are the APU GEN & APU BLEED usually left on?
Replies: 11
Views: 2187

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

Seems then that the APU GEN and the APU BLEED switches are both left on in the older Boeings, once they have been turned on (from, say, cold & dark cockpit)? Martin I'd like to add that on the B757/B767 neither switch is selected OFF unless directed by checklist or maintenance procedure. They a...

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by fr8mech
Wed May 22, 2019 10:00 am
Forum: Non-Aviation
Topic: Have you ever been able to change someone's mind
Replies: 20
Views: 1456

Re: Have you ever been able to change someone's mind

I was taught to learn, and be able to argue, both sides of a debate. It makes one a much more effective debater, You look at both sides of an issue, and try to look at it from the point-of-view of "a believer". It is a very effective tactic. It may also lead one to change their mind on a s...

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by fr8mech
Tue May 21, 2019 4:23 pm
Forum: Technical/Operations
Topic: Why are the APU GEN & APU BLEED usually left on?
Replies: 11
Views: 2187

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

I was specifically interested in the B767 for this question. Watching an in-cockpit (real world) video, I noticed that my procedure wasn't quite the same with respect to the APU. Seems then that the APU GEN and the APU BLEED switches are both left on in the older Boeings, once they have been turned...

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by fr8mech
Tue May 21, 2019 3:26 am
Forum: Technical/Operations
Topic: Why are the APU GEN & APU BLEED usually left on?
Replies: 11
Views: 2187

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

Simply put, it’s designed that way to reduce flight crew workload. On older Boeings (757/767), and I’ll assume the newer ones, too, the APU ECU commands the bleed valve to close, irrespective of bleed switch position, when the APU is selected off. Conversely, the ECU commands the valve to open when ...

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by fr8mech
Sun May 19, 2019 4:58 pm
Forum: Non-Aviation
Topic: Garbage disposal, interstellar?
Replies: 35
Views: 2301

Re: Garbage disposal, interstellar?

Well before we had car/train/plan transportation to know that the world existed way beyond what you see in everyday life, people sent their trash "away" into the rivers since it was carried far away. That didn't work too well and came back to bite us. Isn't this the same thing?? If you ge...

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by fr8mech
Sat May 18, 2019 6:05 pm
Forum: Non-Aviation
Topic: Garbage disposal, interstellar?
Replies: 35
Views: 2301

Re: Garbage disposal, interstellar?

At several hundred million dollars per garbage truckload? Have you not read my post? :banghead: My post came first and talked about weight, which is the same as cost when it comes to space flight. I was commented on the fact that launching our crap into the sun would be a way of dealing with the pr...

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by fr8mech
Sat May 18, 2019 11:04 am
Forum: Non-Aviation
Topic: Garbage disposal, interstellar?
Replies: 35
Views: 2301

Re: Garbage disposal, interstellar?

Humanity has to face and learn how to deal with its own shit, that also means learning to reduce all the garbage produced. Otherwise sending it to the Sun would only be a way to avoid the problem. Wouldn’t sending the crap into The Sun be a way that humanity is actually dealing with the problem? Th...

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by fr8mech
Sat May 18, 2019 7:22 am
Forum: Non-Aviation
Topic: Where to turn to learn about home buying
Replies: 20
Views: 1869

Re: Where to turn to learn about home buying

, so I thought I'd ask the esteemed a.net community for their opinions on whatever books, pamphlets, websites etc. are good ones to turn to as reliable, worthwhile primers for the total American homebuying novice. :boggled: Gracias. Quite simply, the wife and I used whatever edition of Home Buying ...

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by fr8mech
Sat May 18, 2019 7:13 am
Forum: Non-Aviation
Topic: Garbage disposal, interstellar?
Replies: 35
Views: 2301

Re: Garbage disposal, interstellar?

How much weight do you think those things lift? How much does it cost to lift that weight? How much waste is generated?

Do you see the problem?

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by fr8mech
Wed May 15, 2019 2:59 am
Forum: Technical/Operations
Topic: Engine failure question
Replies: 46
Views: 4026

Re: Engine failure question

And another question, can a 737 ferry flight on one engine? Hypothetically, a 737 encounters an uncontained engine failure and the exploded fan disc punctures the fuselage (oxygen decompression), and successfully lands at a small airport that normally doesn’t have jets. But they don’t have equipmen...

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by fr8mech
Mon May 13, 2019 6:30 pm
Forum: Technical/Operations
Topic: Closing and Opening of Aircraft Doors
Replies: 14
Views: 3221

Re: Closing and Opening of Aircraft Doors

You know, people do this all the time. Do you pat your wallet or feel for your phone, even though you know it’s there? You’re performing a version of “pointing and calling”. When I finish with the stove, I pass my hand over the controls, even though I can visually verify that the controls are all in...

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by fr8mech
Wed May 08, 2019 8:24 pm
Forum: Technical/Operations
Topic: How did O2 work on early 747 upper decks
Replies: 27
Views: 4475

Re: How did O2 work on early 747 upper decks

What's a blow out panel? In this case, it’s a section of the wall panel that is designed to fail in case the area behind it gets pressurized due to some kind of duct leak. It a) provides a visual indication of failure, and b) minimizes the risk of further damage behind the panel. That said, I’m not...

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by fr8mech
Wed May 08, 2019 6:09 pm
Forum: Technical/Operations
Topic: How did O2 work on early 747 upper decks
Replies: 27
Views: 4475

Re: How did O2 work on early 747 upper decks

Look at the PSU in the upper-right corner of the image. There’s what appears to be a quarter inch or so hole. That’s where a mechanic would insert a tool...a swizzle stick worked just fine...to open the door and access the masks. Looking at it a little closer, there is another hole, looks like a dim...

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by fr8mech
Wed May 08, 2019 5:36 pm
Forum: Technical/Operations
Topic: How did O2 work on early 747 upper decks
Replies: 27
Views: 4475

Re: How did O2 work on early 747 upper decks

There are masks. If you look closely at the PSU in the first picture, you’ll see a faint outline of a door. There were 3(?) masks behind the door. The little hole you see, allowed maintenance to access the masks.

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by fr8mech
Tue May 07, 2019 4:19 pm
Forum: Non-Aviation
Topic: How do you even make friends in today's age.
Replies: 65
Views: 5957

Re: How do you even make friends in today's age.

Join a club. I think this is the key. Too many people of the current generation, and the millennials, I think, rely too much on virtual social interaction and not enough on actual social interaction. Whether your cub is a church, a sporting hobby, a school, etc., you'll find like-minded people. Hel...

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by fr8mech
Tue May 07, 2019 4:09 pm
Forum: Technical/Operations
Topic: 737Max Storage Question
Replies: 8
Views: 2073

Re: 737Max Storage Question

Then why are they not doing this to all of the aircraft that are stored? Because each carrier, with approval from the regulator and manufacturer have their own way of storing aircraft. For instance, when we "store" an engine, we place desiccant bags in the fan case and exhaust before cove...

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by fr8mech
Mon May 06, 2019 6:45 pm
Forum: Non-Aviation
Topic: Sparing the rod?
Replies: 51
Views: 2897

Re: Sparing the rod?

Funny, I just put up a child gate to the kitchen.... We used gates, to great effect, mostly around stairs. But, what's the lesson learned with the gate, if any? Quite simply, I don't feel that a toddler can make the connection between a hot stove and being excluded from the kitchen. I removed her f...

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by fr8mech
Sun May 05, 2019 10:48 pm
Forum: Non-Aviation
Topic: Sparing the rod?
Replies: 51
Views: 2897

Re: Sparing the rod?

False dilemma.... You clearly feel that you are right, no sense debating this when you clearly not open to it, So good luck with raising your daughter, hopefully she will be alright and grow up to be a healthy individual. Not a false dilemma, an actual dilemma. Spanking was the “last resort” after ...

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by fr8mech
Sun May 05, 2019 10:15 pm
Forum: Non-Aviation
Topic: Sparing the rod?
Replies: 51
Views: 2897

Re: Sparing the rod?

So she wanted to help (= good behavior right) and got a negative massage, even severely negative: got hit. Don't think giving your kid a slab will accomplish anything. Your kid might start to fear you, instead of respecting you and your authority. So, you’re in the “let her severely burn her hand” ...

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by fr8mech
Sun May 05, 2019 8:06 pm
Forum: Non-Aviation
Topic: Sparing the rod?
Replies: 51
Views: 2897

Re: Sparing the rod?

If you spank a child, and his/her behavior doesn't change, what do you do? Spank them again? Spank them harder? Spank them longer? That’s that line I was talking about. Eventually, you understand what motivates, and de-motivates your kid, and your kid learns where your line is. I honestly can’t say...

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by fr8mech
Sun May 05, 2019 7:24 pm
Forum: Non-Aviation
Topic: Sparing the rod?
Replies: 51
Views: 2897

Re: Sparing the rod?

When my daughter was 3’ish she wanted to “help” me cook. After several, increasingly stern, admonishments, plus a banishment, she finally got a quick spanking. She got the message. Or, maybe I should have let her suffer a 2nd or 3rd degree burn to her hand? There is a place for spanking. Problem is,...

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by fr8mech
Sat May 04, 2019 3:22 am
Forum: Technical/Operations
Topic: Storing operational Aircraft Long Term
Replies: 7
Views: 1290

Re: Storing operational Aircraft Long Term

If I take a B737/A340/CJ700, and prepare it for storage in a reasonable way, and then wait 2 years, and then come back and do minor maintenance and fluid replacement, can I fly the plane? How long becomes too long? The maintenance you do before, during and after the storage period should be spelled...

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by fr8mech
Sat Apr 27, 2019 5:34 am
Forum: Technical/Operations
Topic: Hangar queens, still a thing ?
Replies: 34
Views: 5497

Re: Hangar queens, still a thing ?

Interesting, do you ever get to the point where a particular airframe is so problematic you just start using it for parts ? No, aircraft are expensive. We fix them and fly them. If we have a problematic aircraft, we program some ground time, and build a work package for it, based on the problems we...

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by fr8mech
Sat Apr 27, 2019 2:08 am
Forum: Travel, Polls & Preferences
Topic: When is "Arrival"
Replies: 18
Views: 2798

Re: When is "Arrival"

SRQKEF wrote:
They don’t. The time the aircraft touches down doesn’t matter when it comes to on-time performance, it’s all about “blocks on” time.


Point of order..."block on" is the landing time, "block in" is the arrival time.

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by fr8mech
Sat Apr 27, 2019 1:54 am
Forum: Technical/Operations
Topic: Hangar queens, still a thing ?
Replies: 34
Views: 5497

Re: Hangar queens, still a thing ?

Yup, of course they exist. It's not a particular fleet-type, just a few tails, across the fleet, that seem to be our "least-best". Disappointingly, one of those tails is about 6 months old with about 1500 hours. But, it's getting better. You know an aircraft is a "hangar queen" w...

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by fr8mech
Thu Apr 25, 2019 2:04 am
Forum: Technical/Operations
Topic: Curiosity about pre delivery vertical stabilizer
Replies: 16
Views: 2791

Re: Curiosity about pre delivery vertical stabilizer

How are they balanced as installed? Just happened to read through the engineering document for painting the aircraft. In real simple terms, it's done through calculations. You measure the average thickness of the paint before removal, then again after paint installation. Then you do the math. Refer...

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by fr8mech
Thu Apr 25, 2019 12:04 am
Forum: Technical/Operations
Topic: Curiosity about pre delivery vertical stabilizer
Replies: 16
Views: 2791

Re: Curiosity about pre delivery vertical stabilizer

If they repaint it while mounted, they probably remove it after and rebalance it. No. At least we don't after a paint visit. Why don't they have to remove the rudder for repainting then? Doc, the SRM (structural repair manual) provides procedures for balancing the rudder while on the aircraft. I su...

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by fr8mech
Wed Apr 24, 2019 5:53 pm
Forum: Technical/Operations
Topic: 767-300 (non-ER) Transatlantic
Replies: 28
Views: 3126

Re: 767-300 (non-ER) Transatlantic

There are a few other issues as well, not mentioned. It is not just the physical capabilities of the airframe. Depending on where the aircraft flies, it requires other equipment. Like HF radios, CPDLC/ADS, 8.33 KHz channel spacing. Some of this is for operations in New York/Gander/Shanwick Oceanic ...

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by fr8mech
Wed Apr 24, 2019 5:59 am
Forum: Technical/Operations
Topic: 767-300 (non-ER) Transatlantic
Replies: 28
Views: 3126

Re: 767-300 (non-ER) Transatlantic

Any reason that a non-ETOPS B767 couldn't make the trip flying a non-ETOPS route? We rarely do it, and we're certainly not fans of doing it, but we have done it in the past.

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by fr8mech
Sat Apr 20, 2019 12:09 am
Forum: Technical/Operations
Topic: Staying on the centre line
Replies: 33
Views: 4749

Re: Staying on the centre line

Yes, but you aren't going to be steering with the tiller during the take-off roll or the landing roll, which is what the original question was asking. True, but I wasn't replying to the op at this point, I was responding to the comment/statement/assertion that: It's all manual using rudder and, it ...

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by fr8mech
Fri Apr 19, 2019 7:53 am
Forum: Technical/Operations
Topic: Staying on the centre line
Replies: 33
Views: 4749

Re: Staying on the centre line

It's all manual using rudder. And you certainly *can* feel it sometimes, even in an airliner. It depends on the winds and the pilot. I have felt like the plane was going to turn over on some takeoffs and landings. No, it is not all manual using rudder. Airliners have nose wheel steering that can be...

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by fr8mech
Thu Apr 18, 2019 11:55 am
Forum: Technical/Operations
Topic: Quad engines and reverse thrust use
Replies: 42
Views: 3760

Re: Quad engines and reverse thrust use

Legs wrote:

Funny, for the large quad I work on (albeit a military one), the book dictates that if one thrust reverser is inoperative, its symmetric paired engines reverser must be locked out, with an adjustment to the landing roll.



4 installed, 3 required on the B747.

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by fr8mech
Thu Apr 18, 2019 10:20 am
Forum: Technical/Operations
Topic: Staying on the centre line
Replies: 33
Views: 4749

Re: Staying on the centre line

Do the wheels lock on a particular heading? The steering system keeps the nose wheels centered, but they are not locked. The flight crew uses the rudder pedal steering system to make small adjustments. As the aircraft speeds up, the rudder begins to gain authority. If the pilot were to sneeze and j...

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by fr8mech
Thu Apr 18, 2019 9:22 am
Forum: Technical/Operations
Topic: Mode S transponder ID
Replies: 10
Views: 1545

Re: Mode S transponder ID

It’s assigned by the country that the aircraft is registered in. It is programmed into the unit. The unique address is assigned to the aircraft, if a transponder is replaced it needs to be programmed with the correct id. Essentially not a lot of difference between a light aircraft transponder and a...

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by fr8mech
Wed Apr 17, 2019 2:13 am
Forum: Technical/Operations
Topic: Feeder Airlines In Major Carrier Colors: Why?
Replies: 4
Views: 1696

Re: Feeder Airlines In Major Carrier Colors: Why?

It's almost certainly contractual.

From a customer perspective, it's a continuity thing. AA from end-to-end, who really reads the "dba" or "operated by" line anyway?

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by fr8mech
Mon Apr 15, 2019 6:23 pm
Forum: Non-Aviation
Topic: Notre-Dame cathedral on fire in Paris
Replies: 108
Views: 11559

Re: Notre-Dame cathedral on fire in Paris

Trump just tweeted: "Perhaps flying water tankers could be used to put it out. Must act quickly!" I'm sure that will work! And it will work wonders for all the fragile manuscripts in the edifice... :roll: Back when I was on the fire department, we were doing a walk-through and updating ou...

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by fr8mech
Sun Apr 14, 2019 11:25 pm
Forum: Technical/Operations
Topic: DC8 55F main cargo door
Replies: 12
Views: 3188

Re: DC8 55F main cargo door

It’s been nearly 30 years since my DC-8 days, but I am pretty sure you need AC (ground power) to operate the door pump. There was a manual way to “pump” the door up IIRC. The door can be pumped open, but there is an isolation valve in the system. I can’t remember if the valve is on the battery bus,...

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by fr8mech
Fri Apr 12, 2019 1:01 am
Forum: Technical/Operations
Topic: Why do MD-80s lock their horizontal stabilizer in an upright position at the gate?
Replies: 24
Views: 3963

Re: Why do MD-80s lock their horizontal stabilizer in an upright position at the gate?

trpmb6 wrote:
Yes, I also thought you got the added benefit of them wanting to return to neutral under their own weight.


Just out of curiosity, I checked the MD11 SRM, and found that both inboard and outboard elevators are balanced to be tail-heavy.

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by fr8mech
Thu Apr 11, 2019 2:13 am
Forum: Technical/Operations
Topic: Why do MD-80s lock their horizontal stabilizer in an upright position at the gate?
Replies: 24
Views: 3963

Re: Why do MD-80s lock their horizontal stabilizer in an upright position at the gate?

trpmb6 wrote:
I take it this was before balance weights became required which would keep aileron/elevators in neutral position?


They are not balanced to keep them in the neutral position, they are balanced to prevent aerodynamic flutter.

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by fr8mech
Wed Apr 10, 2019 8:31 am
Forum: Technical/Operations
Topic: Why do MD-80s lock their horizontal stabilizer in an upright position at the gate?
Replies: 24
Views: 3963

Re: Why do MD-80s lock their horizontal stabilizer in an upright position at the gate?

Dear Dalmd88, This triggers one question from my side: How would MadDog pilots perform the control check on the elevator then? In case the free floating elevator plane was stuck, the control column and the tabs would still be moving freely and the pilots would not notice the problem by the means of...

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