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by LH707330
Mon Oct 11, 2021 4:08 pm
Forum: Travel, Polls & Preferences
Topic: So sick of all these cancelled flights
Replies: 20
Views: 2220

Re: So sick of all these cancelled flights

I agree with the OP, this is not a good look for Southwest, or the other airlines who have done this recently. Some airlines have done a pretty good job maintaining their schedule, or at least more proactively changing things before they go sideways, so it's obviously possible. I think some stricter...

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by LH707330
Wed Oct 06, 2021 1:11 am
Forum: Technical/Operations
Topic: 747 serial 20887 - change of engine mfr.?
Replies: 1
Views: 608

Re: 747 serial 20887 - change of engine mfr.?

viewtopic.php?t=768933
-->

It is rare, but it does happen. A handful of the 747 classics got their engines swapped out, there's more info here: viewtopic.php?t=768933

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by LH707330
Mon Oct 04, 2021 5:37 pm
Forum: Technical/Operations
Topic: Is innovation declining?
Replies: 89
Views: 4363

Re: Is innovation declining?

[Edit: totally forgot about the A300, that eliminates the 1971-1975 hole...] 1981-1985: gap between 767 and A330/340, some work on derivatives (763, 743, 744, MD11). 1995-1999: gap between 777 EIS and full-bore A380 development, more derivatives. Love new data. Didn't know the actual dates. Thanks....

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by LH707330
Mon Oct 04, 2021 4:34 pm
Forum: Technical/Operations
Topic: Is innovation declining?
Replies: 89
Views: 4363

Re: Is innovation declining?

No one outside of China is developing a new commercial airliner now. The 787/A350 was launched in 2004/2006. That's a long time ago. I understood that the A350/787 was about 15%-20% more economical than the A330/777. And that at least half that was the engines. So even if the A350/787 are very diff...

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by LH707330
Mon Oct 04, 2021 4:10 pm
Forum: Technical/Operations
Topic: 747-8 engine choice
Replies: 46
Views: 3785

Re: 747-8 engine choice

One related question I've got on the 747-8 engines: did the thrust line get moved up relative to the wing versus the 400? The 400 pylons certainly look a lot deeper than on the -8, where the engines look much more cramped underneath the wing. Did they keep the bottom of the nacelle in about the same...

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by LH707330
Mon Oct 04, 2021 5:04 am
Forum: Technical/Operations
Topic: 747-8 engine choice
Replies: 46
Views: 3785

Re: 747-8 engine choice

There are two things at play: 1. The 747 has less T/W in most conditions than modern twins because of the OEI consideration. This means that it usually climbs at a more leisurely rate, as do most quads vs their twin counterparts. 2. Initial cruise for many planes is to alarge degree a function of wi...

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by LH707330
Sat Oct 02, 2021 6:44 pm
Forum: Technical/Operations
Topic: VFR with Single Engine Piston into big airports in the US
Replies: 10
Views: 1006

Re: VFR with Single Engine Piston into big airports in the US

I did approaches into larger airports in the US when I was working on my Commercial SEL cert, usually ATC is pretty friendly. We did a flight to KPDX (Class C) and the approach controller asked us for best speed down final because we had following traffic. KSEA usually won't let you do practice appr...

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by LH707330
Sat Sep 25, 2021 7:36 pm
Forum: Technical/Operations
Topic: What makes up of the JT3D hush kit?
Replies: 12
Views: 1200

Re: What makes up of the JT3D hush kit?

These really aren't considered Stage anything hush kits right? No noise Stages existed yet. I do know there was Stage I noise aircraft that had Stage II hush kits, but Stage II is not all that quieter then Stage I. I assume if these were any Stage hush kit, these would likely be considered Stage II...

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by LH707330
Sat Sep 25, 2021 4:22 pm
Forum: Technical/Operations
Topic: What makes up of the JT3D hush kit?
Replies: 12
Views: 1200

Re: What makes up of the JT3D hush kit?

Is that an engine ferry pod? The inboard piece is a ferry pod, the mount on the engine at the left of the picture are the "organ pipes" that were added to most, if not all turbojet and Conway-powered 707s. The JT3Cs had the two circles with 10 pipes each, and the JT4As and Conways each ha...

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by LH707330
Fri Sep 24, 2021 3:41 pm
Forum: Technical/Operations
Topic: What makes up of the JT3D hush kit?
Replies: 12
Views: 1200

Re: What makes up of the JT3D hush kit?

There was a hushkit fitted to early 707s, which looks pretty bizarre. I've heard it referred to as the "Buck Rogers". I can't imagine that this was tremendously effective (hence, why it was so difficult to find an image of it): https://i.stack.imgur.com/z6Eji.jpg Would you guys think that...

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by LH707330
Thu Sep 23, 2021 4:48 pm
Forum: Technical/Operations
Topic: What makes up of the JT3D hush kit?
Replies: 12
Views: 1200

Re: What makes up of the JT3D hush kit?

Which version are you talking about? I'm aware of at least 3 hush kit designs for the 707: 1. Comtran longer duct long intake on the 300B/C (seems to be the most common one) http://www.michaelprophet.com/News_articles/The707Collection/imagesB707/memories/9.jpg Scroll to the DAS Air Cargo pics: http:...

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by LH707330
Thu Sep 23, 2021 4:34 pm
Forum: Technical/Operations
Topic: 747 small "hump" in front of tailfin
Replies: 12
Views: 2563

Re: 747 small "hump" in front of tailfin

There was a PIP of the " Dorsal fin fairing", it was introduced around 1993/94 and even all our KLM 747classic's were modified in 1995 to obtain a fuel saving of 0,25 %. Are you referring to this one? https://live.staticflickr.com/65535/49838607166_9657126085_c.jpg Thread on that here: ht...

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by LH707330
Tue Sep 21, 2021 3:17 pm
Forum: Technical/Operations
Topic: Why do some major airports like LAX and PHX not have crosswind runways?
Replies: 20
Views: 2794

Re: Why do some major airports like LAX and PHX not have crosswind runways?

Some major international airports seem to only have runways for average prevailing wind conditions. Why do they not have a crosswind runway for special circumstances? Do these airports not experience extreme crosswind conditions at times? And what do airlines do in extreme crosswind conditions at t...

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by LH707330
Mon Sep 20, 2021 4:50 pm
Forum: Technical/Operations
Topic: How much effort to develop ATR combi with front pax loading?
Replies: 10
Views: 1453

Re: How much effort to develop ATR combi with front pax loading?

If you see the draft drawings in OP, 8th row is configured as exit row in A,B and C configs. My concern was whether that would comply with 14 CFR 25.813, which states "Where more than one floor level exit per side is prescribed, at least one floor level exit per side must be located near each ...

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by LH707330
Fri Sep 17, 2021 3:53 pm
Forum: Technical/Operations
Topic: How much effort to develop ATR combi with front pax loading?
Replies: 10
Views: 1453

Re: How much effort to develop ATR combi with front pax loading?

Gotcha. Two things I'd be curious about then: 1. Would you need to have he exit doors in the last row so that there are no dead ends? Recall the discussion about the 748 grandfathering the nose section with the evacuation rules saying you always need two paths in case one is blocked. 2. When were th...

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by LH707330
Thu Sep 16, 2021 5:11 pm
Forum: Technical/Operations
Topic: How much effort to develop ATR combi with front pax loading?
Replies: 10
Views: 1453

Re: How much effort to develop ATR combi with front pax loading?

I thought flexible dividers were no longer certifiable after the SAA 295 crash, not sure if OP's idea is to move that bulkhead from one flight to the next or to keep it fixed. Regarding the W+B, having a cargo bay all the way in front or all the way in back would have a long moment arm. Either way y...

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by LH707330
Sun Sep 12, 2021 4:20 pm
Forum: Technical/Operations
Topic: Engine placement for 6 engine airplanes
Replies: 4
Views: 1168

Re: Engine placement for 6 engine airplanes

The 6 individual pods give you more safety from contagious failures at the expense of more wetted surface. Engines in side-by-side pods have experienced contagious failures on Il-62s: https://en.wikipedia.org/wiki/LOT_Polish_Airlines_Flight_7 https://en.wikipedia.org/wiki/LOT_Polish_Airlines_Flight_...

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by LH707330
Wed Sep 08, 2021 4:31 pm
Forum: Technical/Operations
Topic: Innovations created by one airliner manufacturer that were later adopted by another airliner manufacturer?
Replies: 8
Views: 1323

Re: Innovations created by one airliner manufacturer that were later adopted by another airliner manufacturer?

There are a lot of things that one OEM does that another adopts. In many cases, all understand the merits of an innovation, but there's disagreement about how or when to go and build it based on maturity and cost. Some examples: Underslung podded engines: pioneered by the 707, later adopted as indus...

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by LH707330
Tue Sep 07, 2021 7:59 pm
Forum: Technical/Operations
Topic: PA28, 0.6 gallons remaining (2.5 liters) of usable fuel at landing
Replies: 32
Views: 3713

Re: PA28, 0.6 gallons remaining (2.5 liters) of usable fuel at landing

But in summary, the main mistery is how the right tank was almost depleted and the left tank had still much more. Maybe simply because of key moments of the flight being on the right tank, and this is why this situation was reached (so frustrating to reach such a risky point, without knowing really...

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by LH707330
Tue Sep 07, 2021 3:04 am
Forum: Technical/Operations
Topic: Are four engine airliners harder to handle than twins?
Replies: 26
Views: 4236

Re: Are four engine airliners harder to handle than twins?

It was either Joe Sutter's book "747" or Serling's "Legend and Legacy" that mentioned this, when Boeing went to do the 727 they got a guy from Lockheed to come back from retirement to help them with the control system. That's a big reason the flight controls are much better on th...

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by LH707330
Sun Sep 05, 2021 7:33 pm
Forum: Technical/Operations
Topic: PA28, 0.6 gallons remaining (2.5 liters) of usable fuel at landing
Replies: 32
Views: 3713

Re: PA28, 0.6 gallons remaining (2.5 liters) of usable fuel at landing

Since at the club the fuel gauges are not considered accurate, i was focused on my calculations and didn’t look very much at them, definitely a lesson there. They were consistent, the right fuel gauge was showing completely empty and the left one having a bit left. Well, there's an old joke that yo...

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by LH707330
Fri Sep 03, 2021 4:41 pm
Forum: Technical/Operations
Topic: N1 creeping up in climb 737NG
Replies: 9
Views: 1871

Re: N1 creeping up in climb 737NG

Fascinating. Thanks for the answers guys, sounds like PMDG got it right and it wasnt just me overthinking. Guess my confusion was, directly relating N1 percentage with engine wear. Outside of my aviation hobby, Im a car guy, so the picture i was painting in my mind was 101% N1 was equivalent to bou...

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by LH707330
Fri Sep 03, 2021 4:36 pm
Forum: Technical/Operations
Topic: PA28, 0.6 gallons remaining (2.5 liters) of usable fuel at landing
Replies: 32
Views: 3713

Re: PA28, 0.6 gallons remaining (2.5 liters) of usable fuel at landing

Couple questions to help narrow it down: 1. What were your fuel gauges showing? 2. Were you leaning at intermediate altitudes to hit the book fuel burn numbers? Also, how much fudge factor did you bake in? The POH numbers are usually for clean, new aircraft with new engines and proper procedure, so ...

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by LH707330
Thu Sep 02, 2021 7:55 pm
Forum: Technical/Operations
Topic: GE or PW jet engines on Finnair MD-11s?
Replies: 5
Views: 963

Re: GE or PW jet engines on Finnair MD-11s?

https://airlinercafe.com/page.php?id=392
-->

One easy way to tell the difference is to see if the core cone sticks out of the engine. If it does, it's GE. If it's got a more rounded core exhaust and the cone is not visible, it's PW. Check out this article: https://airlinercafe.com/page.php?id=392

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by LH707330
Tue Aug 31, 2021 2:55 am
Forum: Technical/Operations
Topic: Size of speed brakes[spoilers] on airliners?
Replies: 14
Views: 1738

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

So here's an interesting one. On the 737-800, the spoiler deflection was increased with the short-field performance package. This puts the spoiler deflection angle in line with the outboard spoiler panel at 60 degrees, compared to those without the short-field performance package which were limited...

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by LH707330
Tue Aug 31, 2021 2:52 am
Forum: Technical/Operations
Topic: How do late production A/C differ from earlier examples?
Replies: 9
Views: 1314

Re: How do late production A/C differ from earlier examples?

A330/340: wing twist change (l/n 74 IINM), new stabilizer fairing (introduced on A332, then backported to 333/343/342, l/n 182 IINM: https://airlinercafe.com/forums.php?m=posts&p=75318), switch from CRT to 2 Also on the newer A330s: FBW rudder, digital backup instrumentation instead of steam, L...

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by LH707330
Mon Aug 30, 2021 11:33 pm
Forum: Travel, Polls & Preferences
Topic: Examples of Where Older Versions of Aeroplanes Outlive Newer Versions
Replies: 26
Views: 3213

Re: Examples of Where Older Versions of Aeroplanes Outlive Newer Versions

Thread bump... To generalize: whenever an older model gets it more right than a newer model or has a larger support network, that old one sticks around longer. The example of the 343 is a good one: the engine has a lot of common parts with the 320 engines and was designed well from the start. The 50...

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by LH707330
Mon Aug 30, 2021 11:21 pm
Forum: Technical/Operations
Topic: How do late production A/C differ from earlier examples?
Replies: 9
Views: 1314

Re: How do late production A/C differ from earlier examples?

Many aircraft families have changes during the production run, either to standardize parts, make things a bit better, lower costs, etc. Sometimes an enhancement developed for a new model gets backported. A few I can think of: A320: tortilla chips, winglets, new tank layout (designed for 321 then bac...

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by LH707330
Mon Aug 30, 2021 8:33 pm
Forum: Technical/Operations
Topic: Size of speed brakes[spoilers] on airliners?
Replies: 14
Views: 1738

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 LH707330
Sat Aug 28, 2021 4:15 pm
Forum: Technical/Operations
Topic: Size of speed brakes[spoilers] on airliners?
Replies: 14
Views: 1738

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 LH707330
Fri Aug 27, 2021 2:54 pm
Forum: Technical/Operations
Topic: original wing(span) of the 787-9
Replies: 7
Views: 1892

Re: original wing(span) of the 787-9

I'm tempted to say it was supposed to be 6 feet per side for a total of 209'4", so 63.80.

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by LH707330
Thu Aug 26, 2021 11:37 pm
Forum: Technical/Operations
Topic: CFM56 versus GTF
Replies: 3
Views: 1040

Re: CFM56 versus GTF

Airlines spend a chunk of money on maintenance, and a much bigger chunk of money on fuel. Check out table 4-6 in here: https://www.faa.gov/regulations_policies/policy_guidance/benefit_cost/media/econ-value-section-4-op-costs.pdf Depending on the aircraft size, fuel is 2-3x more than total maintenanc...

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by LH707330
Wed Aug 25, 2021 4:38 am
Forum: Technical/Operations
Topic: Why didn't Boeing power the 727 with JT3D engines?
Replies: 23
Views: 3618

Re: Why didn't Boeing power the 727 with JT3D engines?

Even in those days, fuel burn was important: you don't want to burn too much fuel because even if it was free, it still eats into your payload and range numbers. Granted, expensive fuel shifts the priority a bit, but it's not like the designers of the time were not chasing every last % the same exac...

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by LH707330
Mon Aug 23, 2021 11:19 pm
Forum: Technical/Operations
Topic: Flap setting differences on DC-9-10 and other DC-9 types
Replies: 9
Views: 927

Re: Flap setting differences on DC-9-10 and other DC-9 types

The downward deck angle is common on aircraft with no slats, the CRJ100/200 do the same thing. I don’t think I’d generalize that widely, as the 145 family doesn’t have slats, but doesn’t land nose down. Yes the DC9-10 does land with a distinct nose down attitude on approach Fair criticism, let's go...

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by LH707330
Mon Aug 23, 2021 3:19 pm
Forum: Technical/Operations
Topic: Flap setting differences on DC-9-10 and other DC-9 types
Replies: 9
Views: 927

Re: Flap setting differences on DC-9-10 and other DC-9 types

The downward deck angle is common on aircraft with no slats, the CRJ100/200 do the same thing.

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by LH707330
Mon Aug 23, 2021 12:45 am
Forum: Technical/Operations
Topic: Weight conversions to imperial/metric for 'used' aircraft- how does it work?
Replies: 14
Views: 1232

Re: Weight conversions to imperial/metric for 'used' aircraft- how does it work?

All you need to do is multiply or divide the right numbers by 2.2 to get what you need. Just ask the team at Air Canada :P

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by LH707330
Mon Aug 23, 2021 12:42 am
Forum: Travel, Polls & Preferences
Topic: Do Airbus pilots have nicknames for their aircraft?
Replies: 17
Views: 3070

Re: Do Airbus pilots have nicknames for their aircraft?

http://www.b737.org.uk/aircraftnicknames.htm
-->

The most common ones I hear are "Atari" and "Trash panda."

This site has a whole list of them: http://www.b737.org.uk/aircraftnicknames.htm

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by LH707330
Tue Aug 17, 2021 10:29 pm
Forum: Technical/Operations
Topic: If an airliner is too heavy for takeoff due to conditions, how is it lightened? Remove pax? cargo?
Replies: 17
Views: 2396

Re: If an airliner is too heavy for takeoff due to conditions, how is it lightened? Remove pax? cargo?

How proactive is dispatch and/or scheduling about all of this? Do they sell less seats in PHX in the summer or do they just leave it up to the pilots and gate agents to sort it all out on the day of? My guess is that the competent outfits plan on a likely set of conditions based on history and fore...

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by LH707330
Tue Aug 17, 2021 3:48 pm
Forum: Technical/Operations
Topic: If an airliner is too heavy for takeoff due to conditions, how is it lightened? Remove pax? cargo?
Replies: 17
Views: 2396

Re: If an airliner is too heavy for takeoff due to conditions, how is it lightened? Remove pax? cargo?

I've seen a couple of these scenarios. Coming out of Denver on an unseasonably warm day, they needed to bump 6 people on an E175. Nobody went for the $250 that they first offered, so they increased the bid to $1000 and they had enough takers. IMHO that sort of auction should be the standard. The bag...

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by LH707330
Tue Aug 17, 2021 3:23 am
Forum: Technical/Operations
Topic: For older pilots: What was it like to fly commercial jetliners before FAR 91:117?
Replies: 16
Views: 2068

Re: For older pilots: What was it like to fly commercial jetliners before FAR 91:117?

my last 4 flights in the US, only on arrival into MDW was there a resemblance of a 250 speed limit under 10,000. Other 3 going into either light trafficked airports or coming into busy airspace thru an empty corner, RSW, BWI and DTW, all on 737NGs, seemed like the only speed restriction was gear do...

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by LH707330
Wed Aug 11, 2021 3:23 pm
Forum: Travel, Polls & Preferences
Topic: Longest commercial flight record
Replies: 30
Views: 4052

Re: Longest commercial flight record

Oh you actually make a great point here. The L1649A is a really impressive aircraft because of its endurance. It could make power and lift efficiently enough to be able to stay aloft for 23 hours in regular revenue service with plenty of useful payload and land with reserve fuel intact. For all its...

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by LH707330
Mon Aug 09, 2021 10:18 pm
Forum: Travel, Polls & Preferences
Topic: Longest commercial flight record
Replies: 30
Views: 4052

Re: Longest commercial flight record

Oh you actually make a great point here. The L1649A is a really impressive aircraft because of its endurance. It could make power and lift efficiently enough to be able to stay aloft for 23 hours in regular revenue service with plenty of useful payload and land with reserve fuel intact. For all its...

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by LH707330
Thu Aug 05, 2021 9:38 pm
Forum: Travel, Polls & Preferences
Topic: Longest commercial flight record
Replies: 30
Views: 4052

Re: Longest commercial flight record

Oh I should have looked on the schedule. It is 9 hours different, so 22:10 for paris and 21:10 for London. But still, extremely long. I read - maybe on Jon Proctor's blog or some other TWA employee site - that the westbound inaugural on 871 Paris-SFO went over 23 hours non-stop. Part of the reason ...

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by LH707330
Tue Aug 03, 2021 9:58 pm
Forum: Travel, Polls & Preferences
Topic: Longest commercial flight record
Replies: 30
Views: 4052

Re: Longest commercial flight record

Absolutely, the TWA L1649A westbound polar routes were the longest ever flights by duration in the US context. See the schedule below. TW771 operates Monday, London-San Francisco, depart 11:55pm from London, arrive 1:05pm San Francisco. TW871 departs 11pm from Paris, arrives 12:10pm San Francisco. ...

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by LH707330
Tue Aug 03, 2021 9:38 pm
Forum: Civil Aviation
Topic: Time to bring back (some) regulation
Replies: 121
Views: 10431

Re: Time to bring back (some) regulation

Many of the proposed ideas here will have unintended consequences. If the problem OP is trying to fix is "the airline didn't hold up their end of the bargain because they dropped the ball on crew scheduling/vendor mgmt/etc.," then the only reform needed is a penalty/refund system that make...

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by LH707330
Tue Aug 03, 2021 8:14 pm
Forum: Technical/Operations
Topic: Thrust limits for derated jet engine?
Replies: 5
Views: 1379

Re: Thrust limits for derated jet engine?

Short answer is " it depends," on a couple of variables: 1. If it's mechanically constrained (maybe the DC-10-15 engine was, I don't know), then it wouldn't be adjustable and in a pinch you'd get pinched. I'm not sure why that D10 model was limited to 45k #, so I couldn't tell you the spec...

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by LH707330
Tue Aug 03, 2021 5:26 am
Forum: Travel, Polls & Preferences
Topic: Longest commercial flight record
Replies: 30
Views: 4052

Re: Longest commercial flight record

I know some of TWA's Jetstreams were scheduled San Francisco to Paris or London in the late 1950's before the 707s came online, what was the flight time like on those? Of course this wouldnt be longest by distance but by time spent in the air. Absolutely, the TWA L1649A westbound polar routes were ...

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by LH707330
Tue Aug 03, 2021 5:21 am
Forum: Civil Aviation
Topic: Exterior design Airbus NEO vs Classic?
Replies: 9
Views: 3404

Re: Exterior design Airbus NEO vs Classic?

The A330neo also features a reshaped slat 1 and flap-track fairings: https://d1a2ot8agkqe8w.cloudfront.net/web/2019/05/a330neo-key-features-flight-test-article_77299.jpg Source: https://www.flightglobal.com/the-flight-test-of-airbuss-refreshed-widebody-the-a330neo/132343.article I think the flap tr...

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by LH707330
Mon Aug 02, 2021 5:10 pm
Forum: Technical/Operations
Topic: Maximum gross weight step climb question
Replies: 20
Views: 1955

Re: Maximum gross weight step climb question

I am not sure if the same pronounced effect exists with newer generation 787's or A 350's. Both of those designs have a lower wing loading than the 777-300ER, so they tend to have higher initial cruise altitudes, unless it makes sense to start lower for some reason (stronger tailwinds, ATC, turbule...

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