Search found 8223 matches

by fr8mech
Thu Oct 29, 2020 1:30 pm
Forum: Technical/Operations
Topic: Are cargo doors of passenger aircraft operated from the outside?
Replies: 11
Views: 2613

Re: Are cargo doors of passenger aircraft operated from the outside?

As in just about everything in aviation, it depends. On the B747, you can open both the forward and aft doors from the inside. There is a master latch lock release inside and outside. There is an open/close switch both inside and outside. You can close the doors from the inside, but you can’t lock t...

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by fr8mech
Sun Oct 25, 2020 11:40 am
Forum: Technical/Operations
Topic: Tightest flight schedules at a gate?
Replies: 6
Views: 2050

Re: Tightest flight schedules at a gate?

I haven’t worked pax in a long time, but I seem to recall our standard turn time for a B727-200 was 23 mins and a B757 was 27 minutes, or there about. Our wide bodies were a little more...maybe 40 minutes on a B767, and 55 on an L1011? Hmmm, just re-read the OP. If you’re talking gate utilization, t...

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by fr8mech
Wed Oct 21, 2020 12:31 am
Forum: Non-Aviation
Topic: Have you voted in the US Election yet?
Replies: 47
Views: 2709

Re: Have you voted in the US Election yet?

Early, and in person, yesterday. It took me longer to decide how to vote for for Soil Conservation Commissioner than it did to verify my identity and obtain my ballot.

By the way, I took my daughter (18) to vote for the first time. She was so happy with herself..as was I.

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by fr8mech
Tue Oct 20, 2020 7:49 pm
Forum: Non-Aviation
Topic: Political Position (Med Assisted Suicide)
Replies: 59
Views: 2652

Re: Political Position (Med Assisted Suicide)

Generally, I’m ok with someone choosing when it’s time to go. My wife and I discussed it when I was diagnosed a little under 4 years ago. (Happy to say that I am 3 years, 4 months cancer-free). My concerns revolve around competency and the doctor involved in the procedure/process. Competency issues ...

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by fr8mech
Sat Oct 17, 2020 8:17 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: 5203

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

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 well. It might be possible on a low bypass engine, but not probable. In a typical jet engine, the fan is not d...

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by fr8mech
Fri Oct 16, 2020 6:22 pm
Forum: Technical/Operations
Topic: When does it become safe to approach an engine after shutoff?
Replies: 15
Views: 2906

Re: When does it become safe to approach an engine after shutoff?

My personal opinion: an engine is not running if the core is not turning. No N2 (N3); then the engine is not running and it is safe to approach. I’d just about guarantee that the FCOM procedure cited above is related to the core and not the fan. In fact, can you see fan speed (N1) on newer engines w...

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by fr8mech
Thu Oct 15, 2020 9:33 pm
Forum: Technical/Operations
Topic: When does it become safe to approach an engine after shutoff?
Replies: 15
Views: 2906

Re: When does it become safe to approach an engine after shutoff?

Tuch the Fan? The fan needs to be just about stopped before you can get a hold of it. Too much mass there.

As for standing in front of the inlet? Almost immediately. The low pressure in front of the fan dissipates within seconds of shutdown.

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by fr8mech
Thu Oct 15, 2020 4:02 am
Forum: Technical/Operations
Topic: Off position for landing gear handle
Replies: 24
Views: 5206

Re: Off position for landing gear handle

They are huge and good question, I think so but am not sure, not flown the 763 but I did fly the 762 and I think the gear is normally extended and retracted hydraulically on that aircraft Strangely, the AMM does not clearly state that the main gear is hydraulically driven down. In fact, the wording...

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by fr8mech
Mon Oct 05, 2020 12:17 am
Forum: Technical/Operations
Topic: Until when will the tiller be used?
Replies: 33
Views: 4824

Re: Until when will the tiller be used?

VMCA787 wrote:
IIRC, it is nosewheel oleo extension that triggers the centering mechanism.


The centering mechanism is mechanical in nature...at least on Boeings, I’d have to check our Airbus manual later this week to confirm. There is a cam that is engaged when the lower strut (piston) is fully extended.

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by fr8mech
Thu Oct 01, 2020 12:53 am
Forum: Technical/Operations
Topic: Safety Hazards In/Around Aircraft
Replies: 13
Views: 3646

Re: Safety Hazards In/Around Aircraft

If I am not mistaken, the AMM does not mention the procedure and the lockout devices that AMTs must to use to deactivate aircraft systems. I'm not sure where you get that idea. The AMM has several instances where it instructs the AMT to make a system safe, or deactivate it to prevent injury or dama...

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by fr8mech
Tue Sep 29, 2020 7:39 pm
Forum: Technical/Operations
Topic: Airline test flights?
Replies: 12
Views: 3040

Re: Airline test flights?

At the carrier I worked as a crew scheduler for pilots were always adamant that we refer to it as a Functional Check Flight, as test flights were for experimental aircraft, and those pilots got paid way more. That reminds me of an FAA inspector we had that insisted that any repair that wasn’t perma...

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by fr8mech
Mon Sep 28, 2020 8:36 pm
Forum: Technical/Operations
Topic: Until when will the tiller be used?
Replies: 33
Views: 4824

Re: Until when will the tiller be used?

The entire 747 family gives you 13 degrees of steering either side of neutral and 73 degrees with the tiller. 13 degrees is too much. From the AMM for the -8 (the -400 is similar) Directional Control Steering from the rudder pedals is limited to 7 DEG (Degree) left and right. Input from the tillers...

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by fr8mech
Mon Sep 28, 2020 11:31 am
Forum: Technical/Operations
Topic: Until when will the tiller be used?
Replies: 33
Views: 4824

Re: Until when will the tiller be used?

IIRC the earliest 747 Classics did not all have nosewheel steering through the rudder pedals, only the tiller I’m not so sure about that. I’ve worked on the earliest of B747, when they were PanAm and later in their cargo incarnations, and they all had rudder pedal steering. I see very little advant...

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by fr8mech
Sat Sep 26, 2020 1:36 am
Forum: Technical/Operations
Topic: Hazardous APU exhausts
Replies: 14
Views: 4029

Re: Hazardous APU exhausts

rturner wrote:

It might be the ADP exhaust bc i'd always remember it being on the left side right around the wheel well


Kinda strange, because the ADP shouldn’t be run on the ground as a normal thing. It supplements the 2 electric pumps for the center hydraulic system.

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by fr8mech
Thu Sep 24, 2020 8:29 pm
Forum: Technical/Operations
Topic: Hazardous APU exhausts
Replies: 14
Views: 4029

Re: Hazardous APU exhausts

762's have a exhaust port under the mid-section of the a/c. when i was a ramp worker it kept us nice and warm during the christmas rush at amazon. Those (there are 2 of them) are the pack exhausts. Or, maybe you’re referring to the ADP exhaust on the left side of the aircraft, just aft of the wheel...

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by fr8mech
Mon Sep 21, 2020 9:35 pm
Forum: Technical/Operations
Topic: 757 vs. 767 lights
Replies: 15
Views: 3505

Re: 757 vs. 767 lights

It's been years since I've heard this, but a 75/76 driver once told me that the yoke feel was different between the two. If I remember correctly, he said the 75 was "looser," requiring more range of deflection compared to the 76, which felt "tighter" to him. Can anyone confirm/d...

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by fr8mech
Sat Sep 19, 2020 8:54 pm
Forum: Technical/Operations
Topic: Safety Hazards In/Around Aircraft
Replies: 13
Views: 3646

Re: Safety Hazards In/Around Aircraft

What are GMM, GPP, GOM? Are these FAA approved LOTO manuals? General Maintenance Manual, General Policies and Procedures Manual, Ground Operations Manual. These are Some of the different manuals, among many others, that operators use to govern their maintenance and ground operations. They are FAA a...

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by fr8mech
Sat Sep 19, 2020 10:14 am
Forum: Technical/Operations
Topic: 757 vs. 767 lights
Replies: 15
Views: 3505

Re: 757 vs. 767 lights

Not an issue on the much more comfortable, quieter and roomier 767 cockpit Strange. Boeing did some redesign of the equipment cooling system on our new build B767's to quiet the cockpit due to complaints of higher noise levels on our old ones. Yes, the 767 has that unique ‘space creating panel’ tha...

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by fr8mech
Sat Sep 19, 2020 1:28 am
Forum: Non-Aviation
Topic: Ruth Bader Ginsburg has passed away
Replies: 58
Views: 2663

Re: Ruth Bader Ginsburg has passed away

While I am pretty much diametrically opposed to her political ideology, she bull-dozed a path for women to follow. A major loss to The Court and to Americans.

I will miss reading her opinions, especially those in contrast to mine.

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by fr8mech
Sat Sep 19, 2020 1:12 am
Forum: Technical/Operations
Topic: Airliners that don't have engines under wing and don't possess immediate hazard to surroundings
Replies: 10
Views: 2676

Re: Airliners that don't have engines under wing and don't possess immediate hazard to surroundings

I guess it can be done on an exception basis but procedures and prudence dictate against it. You'd also need to have a qualified person on the flight deck to monitor the engine. Fueling the aircraft gets a little more...interesting, from a procedures standpoint. Even though the inlets are up higher,...

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by fr8mech
Fri Sep 18, 2020 8:52 pm
Forum: Technical/Operations
Topic: Off position for landing gear handle
Replies: 24
Views: 5206

Re: Off position for landing gear handle

This is different than on the Douglas DC-8. On these planes, the landing gear remain up with hydraulic pressure and the uplocks being a backup. A hydraulic leak/loss is not as critical on the Douglas than it would be on the Boeing series. Correct, on the DC-8, after the gear went up, the flight cre...

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by fr8mech
Thu Sep 17, 2020 11:04 am
Forum: Technical/Operations
Topic: Off position for landing gear handle
Replies: 24
Views: 5206

Re: Off position for landing gear handle

Trimeresurus wrote:
What would happen if you left it in UP position for the entire flight? Would it slowly depressurize anyway?


No, you would just maintain pressure on the system. The “OFF” position prevents depletion of the hydraulic fluid if a leak were to develop in the landing gear system.

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by fr8mech
Thu Sep 17, 2020 8:47 am
Forum: Technical/Operations
Topic: 727 fuel burn / tank management
Replies: 34
Views: 5294

Re: 727 fuel burn / tank management

Not a driver here, so I can't speak to specific procedures, but as I recall, the center tank on the B727 is the #2 tank. So, when you burn the #2 down to the quantity in the wings, you're actually switching to tank-to-engine when you close the cross-feeds and turn on the wing pumps.

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by fr8mech
Thu Sep 17, 2020 8:04 am
Forum: Technical/Operations
Topic: 757 vs. 767 lights
Replies: 15
Views: 3505

Re: 757 vs. 767 lights

DL_Mech wrote:
Two different factories / Two sets of engineers


The difference between Renton (B757) & Everett (B767) struck me as interesting. Things that should/could have been the same, aren't.

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by fr8mech
Wed Sep 16, 2020 4:04 am
Forum: Technical/Operations
Topic: Safety Hazards In/Around Aircraft
Replies: 13
Views: 3646

Re: Safety Hazards In/Around Aircraft

Interesting, I was told that the FAA has exclusive jurisdiction on the airside. Wrong, I guess. But, https://www.osha.gov/laws-regs/standardinterpretations/1990-11-14 Interesting, but it's also 30 years old, and I have personally provided responses to out Health & Safety folks for response to O...

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by fr8mech
Wed Sep 16, 2020 3:13 am
Forum: Technical/Operations
Topic: Safety Hazards In/Around Aircraft
Replies: 13
Views: 3646

Re: Safety Hazards In/Around Aircraft

It’s, by law, the FAA’s jurisdiction, that’s why. Airside, airplanes, all FAA, OHSA has no jurisdiction. Nope, we see OSHA on the airside all the time. Why FAA get involved on this matter? Where are the instructions for LOTO located? They are in the AMM. If you don't follow the instructions in the ...

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by fr8mech
Tue Sep 15, 2020 4:50 pm
Forum: Technical/Operations
Topic: Inflight Fire Question
Replies: 13
Views: 2606

Re: Inflight Fire Question

Old folks know from school that 3 things are needed for fire. Fuel, oxygen & heat...ye old fire triangle. Now-a-days, we are taught about the fire tetrahedron...fuel, oxygen, heat & the chemical reaction. To extinguish a fire, one of the components must be removed. When we depressurization a...

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by fr8mech
Tue Sep 15, 2020 4:29 pm
Forum: Technical/Operations
Topic: Off position for landing gear handle
Replies: 24
Views: 5206

Re: Off position for landing gear handle

On Boeing’s I’m familiar with (727, 747-100/200/400, 757, 767) when the ‘OFF’ position is selected, all the hydraulic pressure to the gear is removed. The gear rests on its uplocks, which happen to be the doors (main gear) on the B767.

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by fr8mech
Tue Sep 15, 2020 2:46 am
Forum: Technical/Operations
Topic: 757 vs. 767 lights
Replies: 15
Views: 3505

Re: 757 vs. 767 lights

A lot of times it comes down to “that’s where the engineer wanted to put it”.

But, I’d hazard that since the B757 sits higher than the B767, it was a more logical place for the turnoff lights.

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by fr8mech
Sat Sep 12, 2020 1:00 pm
Forum: Technical/Operations
Topic: Do the aircraft of same type(and version) produced many years apart have completely same everything?
Replies: 9
Views: 1608

Re: Do the aircraft of same type(and version) produced many years apart have completely same everything?

No. The longer an aircraft has been in production, the more the manufacturer may tinker with it. Our early B767’s have quite a few differences from our newly delivered ones. The addition of the NGS, some changes to the equipment cooling and the CRT/LCD swap over, to name a few. There are numerous pa...

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by fr8mech
Wed Sep 09, 2020 10:57 pm
Forum: Technical/Operations
Topic: Where is the APU of the 727 located? Does it use the same exhaust opening as the middle engine(#2)?
Replies: 17
Views: 2965

Re: Where is the APU of the 727 located? Does it use the same exhaust opening as the middle engine(#2)?

A picture of the APU exhaust on top of the right wing: A torching APU was always an interesting sight, and rather exciting if there were passengers onboard. A nice picture of the APU in the wheel well: Wow, I just had a flashback to changing the generator on that APU. All funnies aside, I read that...

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by fr8mech
Mon Sep 07, 2020 10:24 pm
Forum: Non-Aviation
Topic: Here’s what the 2020 election boils down to ...
Replies: 40
Views: 1869

Re: Here’s what the 2020 election boils down to ...

This election: the Democrats are voting against someone, the Republicans are voting for someone. It’s hard to win that way.

It’s the same thing that happened with Obama/Romney in 2012.

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by fr8mech
Mon Sep 07, 2020 8:34 pm
Forum: Technical/Operations
Topic: Oxygen masks dropped accidentally
Replies: 10
Views: 1740

Re: Oxygen masks dropped accidentally

They all had a serial number on them. Since they were consumables? Why would they need to be Tracked? The operator may not track them, but the manufacturer may. Probably to the “we sold XXXX serial number to XX operator”. I’ve never worked with O2 generators, but if they have a serial number, and y...

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by fr8mech
Mon Sep 07, 2020 8:26 pm
Forum: Technical/Operations
Topic: Question about autopilot/autothrottle disengagement
Replies: 7
Views: 1207

Re: Question about autopilot/autothrottle disengagement

Some time ago I was jumpseating on an MD11 and while descending, all the way through the approach, the captain would continue to bring the throttles to idle, or near enough. While on final, he mentioned to the FO that “he hates when it does that”. Being in maintenance, after the flight I asked him i...

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by fr8mech
Fri Sep 04, 2020 4:48 am
Forum: Technical/Operations
Topic: Over wing fueling the 747
Replies: 23
Views: 2905

Re: Over wing fueling the 747

I was at an airshow once and a B-52 that had done a flyby had a fuel system issue, so they couldn't go back to wherever and had to land. Turned out they couldn't do automated refueling because the fuel system computer was konked out. So they had to overwing it. It took 16 hours... Not only slower b...

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by fr8mech
Fri Sep 04, 2020 1:50 am
Forum: Technical/Operations
Topic: Over wing fueling the 747
Replies: 23
Views: 2905

Re: Over wing fueling the 747

No, it is a characteristic of the wing design, dihedral. Pressure refueling is pretty reliable and I doubt any airliner has been overwing refueled in the last 30 years. Like I said, 30 plus years, and the only time I've had that cap open was to inject biocide. I think I had a leak once, but that ma...

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by fr8mech
Thu Sep 03, 2020 1:47 am
Forum: Non-Aviation
Topic: What are Your Favorite Albums?
Replies: 46
Views: 1983

Re: What are Your Favorite Albums?

There are just so many. I grew up during the classic era of Rock & Roll Led Zeppelin - Physical Graffiti Led Zeppelin - IV Fleetwood Mac - Rumours The Clash - London Calling Beastie Boys - Licensed to Ill Billy Joel - The Stranger Metallica - Master of Puppets Pink Floyd - Dark Side of the Moon ...

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by fr8mech
Wed Sep 02, 2020 3:03 am
Forum: Non-Aviation
Topic: The German Invasion of Poland
Replies: 6
Views: 621

Re: The German Invasion of Poland

https://podcasts.apple.com/us/podcast/t ... 1219771711

Just listening to the casualty numbers is sobering.
-->

If you have any interest in WWII other than specific points in history, you may want to listen to this podcast:

https://podcasts.apple.com/us/podcast/t ... 1219771711

Just listening to the casualty numbers is sobering.

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by fr8mech
Wed Sep 02, 2020 12:46 am
Forum: Technical/Operations
Topic: Over wing fueling the 747
Replies: 23
Views: 2905

Re: Over wing fueling the 747

I couldn't find any of the Classic info I was looking for, but found that the -400 does have a fill port in each main tank. The ports are located on/in the inboard section of each tank. From their position, I can't see that the tank would ever be completely full. Strange thing, I couldn't find the q...

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by fr8mech
Tue Sep 01, 2020 6:11 pm
Forum: Technical/Operations
Topic: Over wing fueling the 747
Replies: 23
Views: 2905

Re: Over wing fueling the 747

The practice of using overwing fueling I posted about was on regularly scheduled flights though That wouldn’t work as you described, the over wing ports tend to below the max level of the tank, and in the case of the classics, only #2 & #3 had ports, to the best of recollection. Now, if you wan...

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by fr8mech
Tue Sep 01, 2020 12:45 am
Forum: Technical/Operations
Topic: Over wing fueling the 747
Replies: 23
Views: 2905

Re: Over wing fueling the 747

There were definitely overwing fueling ports on the classics, but they were well below the max level of the tank. And, I’m pretty sure it was only the #2 & #3 tanks. I no longer have access to the AMM for the classic, but I may be able to find some old training material when I get to work tomorr...

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by fr8mech
Mon Aug 31, 2020 2:51 pm
Forum: Technical/Operations
Topic: DC10 number two engine position
Replies: 13
Views: 1904

Re: DC10 number two engine position

Interesting picture, I’m surprised at the amount of space between the engine and the cowling, more room to work than I thought There is exactly the same amount of space on the #2 engine as there is on the #1 or #3. In fact, it is much more difficult to reach components on the #2, because the patio,...

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by fr8mech
Fri Aug 28, 2020 3:27 am
Forum: Non-Aviation
Topic: Speed limit observance psychology
Replies: 42
Views: 1679

Re: Speed limit observance psychology

I often wonder about speed limits and their nature as they relate to the (my) philosophy of law. Just driving on the roads, or reading these posts, we know that a sizable percentage of the population routinely exceeds the speed limit. Why? Apathy? Complacency? Ignorance? Obstinance? Rebellion? Whate...

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by fr8mech
Wed Aug 26, 2020 3:01 am
Forum: Technical/Operations
Topic: When thrust lever 3 corresponds to engine n°4 (a 747 case)
Replies: 35
Views: 4047

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

You know, upon further reflection, you probably would see some other indications on the flight deck not directly related to the engine. If you start 3, but 4 actually starts, then you would get #4 hydraulics, #4 electrics & #4 pnuematics. Some aircraft systems would be looking for #3 system acti...

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by fr8mech
Wed Aug 26, 2020 2:15 am
Forum: Technical/Operations
Topic: When thrust lever 3 corresponds to engine n°4 (a 747 case)
Replies: 35
Views: 4047

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

Coming back to original topic - wrong throttle rigging would be more noticeable, but how about entire engine instrumentation being swapped? Not only thrust lever, but all the controls and indicators. Is there any way to notice that without looking directly at the engines - which, I believe was ment...

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by fr8mech
Fri Aug 21, 2020 4:57 am
Forum: Technical/Operations
Topic: When thrust lever 3 corresponds to engine n°4 (a 747 case)
Replies: 35
Views: 4047

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

I'm gonna call B/S on this. There's zero chance the aircraft came off the factory floor with this fault. There's zero chance the aircraft would have gone through post-production with this fault. There's zero chance the aircraft would have been accepted by BA, or any other operator, with this fault. ...

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by fr8mech
Wed Aug 19, 2020 9:29 pm
Forum: Non-Aviation
Topic: Do you have air conditioning (AC) in your home?
Replies: 41
Views: 1554

Re: Do you have air conditioning (AC) in your home?

We do, and have in every home we’ve owned. The Texas house had 2 units. One up, one down. The wife and I like to keep the house around 73F during the day, year round. At night, during the warmer months, we’ll set it to 70F. During the cooler months, we allow the house to get to 65F before the heat k...

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by fr8mech
Tue Aug 18, 2020 4:22 pm
Forum: Technical/Operations
Topic: VC-25B Issues
Replies: 14
Views: 2534

Re: VC-25B Issues

I have filled out dozens of SDR’s (they used to be called Maintenance Reliability Reports (MRR). They’ve ranged from the mundane...a failed light bulb in an emergency lighting circuit...to an actual component structural failure. Fairly routine. Being overly dramatic, there. Cracks are more common th...

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by fr8mech
Fri Aug 14, 2020 12:23 am
Forum: Technical/Operations
Topic: B752 Engine Options?
Replies: 17
Views: 3026

Re: B752 Engine Options?

Is it possible to swap the engines on a 757 from RR to P&W or vice versa? Anything's possible with enough money, but all the instances of airlines selling off frames acquired in mergers that don't match their existing fleet would suggest that it's not an economical proposition. Only if you swap...

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by fr8mech
Wed Aug 12, 2020 9:07 pm
Forum: Technical/Operations
Topic: Why does Fedex/UPS only use the A306 on shorter legs?
Replies: 10
Views: 2435

Re: Why does Fedex/UPS only use the A306 on shorter legs?

UPS A300’s are not ETOPS, so there is no significant over water routing. As for long routes, UPS does not put an aircraft on a route because of its range, it puts it on the route because of its capacity. Yes, range is important, but you’ll frequently see B747 aircraft flying short routes, especially...

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