Search found 281 matches

by convair880mfan
Mon Jan 17, 2022 4:10 am
Forum: Technical/Operations
Topic: Have most or all B737 pilots now been trained on handling rudder hardover incidents?
Replies: 16
Views: 1229

Re: Have most or all B737 pilots now been trained on handling rudder hardover incidents?

Woodreau, I guess you elaborated enough. I was just hoping for a little more explanation. I am interpreting what you said to mean that if the aircraft is too close to the ground, anything the pilot would do would not work because the aircraft needs altitude to recover. So I guess it would be like th...

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by convair880mfan
Mon Jan 17, 2022 3:12 am
Forum: Technical/Operations
Topic: Have most or all B737 pilots now been trained on handling rudder hardover incidents?
Replies: 16
Views: 1229

Re: Have most or all B737 pilots now been trained on handling rudder hardover incidents?

Woodreau, could you perhaps elaborate on "all but impossible" Is the "all but impossible" scenario practiced in the simulator?

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by convair880mfan
Sun Jan 16, 2022 8:15 pm
Forum: Technical/Operations
Topic: Have most or all B737 pilots now been trained on handling rudder hardover incidents?
Replies: 16
Views: 1229

Re: Have most or all B737 pilots now been trained on handling rudder hardover incidents?

Does this apply to all carriers around the world? Are there any 737 pilots here who have practiced the technique[s] in the simulator? I understand action is required quite quickly. Is that correct?

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by convair880mfan
Sun Jan 16, 2022 7:19 pm
Forum: Technical/Operations
Topic: Have most or all B737 pilots now been trained on handling rudder hardover incidents?
Replies: 16
Views: 1229

Have most or all B737 pilots now been trained on handling rudder hardover incidents?

Is this something now taught in simulators and is the training widespread?

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by convair880mfan
Wed Jan 12, 2022 10:40 pm
Forum: Technical/Operations
Topic: Are holding patterns used very much anymore and at which airfields?
Replies: 25
Views: 1911

Re: Are holding patterns used very much anymore and at which airfields?

Is anyone at "fault" when an airplane has to enter a holding pattern or is it weather, SOP or something else? Seems like a holding pattern would add to the fuel bill of an airline. Maybe I am wrong. Do airplanes still fly a racetrack pattern in the hold.

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by convair880mfan
Wed Jan 12, 2022 8:57 pm
Forum: Technical/Operations
Topic: Are holding patterns used very much anymore and at which airfields?
Replies: 25
Views: 1911

Are holding patterns used very much anymore and at which airfields?

I haven't flown for years but the last few years I flew, some airliners I was on were held on the ground when there were too many takeoffs and landings at a destination airport. Only twice did I experience a jetliner flying a holding pattern: once in 1971 on a TWA Boeing 707 that was circling over L...

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by convair880mfan
Sun Jan 09, 2022 7:30 pm
Forum: Technical/Operations
Topic: DC-10 tail mounted engine angle
Replies: 9
Views: 1865

DC-10 tail mounted engine angle

Does anyone know why the tail mounted powerplant of the DC-10 is not parallel to the ground but seems to follow the angle of the rear sections of the fuselage? I know the reason why the wing mounted engines of the DC-10 are slightly angled inward towards the centerline of the aircraft. Would a tail ...

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by convair880mfan
Sun Jan 09, 2022 4:25 am
Forum: Technical/Operations
Topic: Curvature of PW JT8D engine assembly?
Replies: 4
Views: 1122

Re: Curvature of PW JT8D engine assembly?

Those explanations make sense to me. Thanks so much. Here is a photo of a fuselage mounted JT8D. It seems that the engine is canted slightly downward from front to back including the intake duct but that the rear duct [after the turbine section] cants upwards. Perhaps this is an optical illusion. I ...

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by convair880mfan
Sat Jan 08, 2022 5:51 pm
Forum: Technical/Operations
Topic: Curvature of PW JT8D engine assembly?
Replies: 4
Views: 1122

Curvature of PW JT8D engine assembly?

Does anyone know why there is curvature in the Pratt and Whitney JT8D powerplant? Looks as though the gas flow does now follow a straight through path. Also seems like the curvature originates in the afterbody behind the core engine.



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by convair880mfan
Fri Jan 07, 2022 11:05 pm
Forum: Technical/Operations
Topic: Hours on Type/Total Flying Hours Question
Replies: 32
Views: 1737

Hours on Type/Total Flying Hours Question

I was reading an accident report about the crash of a Boeing 720-015B aircraft in the Florida Everglades [NW Flight 705] in 1963. The CAB report is a bit confusing to me on the cause[s]. Seems they are blaming weather and pilots. But in the report it states that the Captain had 17,835 total flying h...

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by convair880mfan
Sat Dec 25, 2021 7:21 pm
Forum: Technical/Operations
Topic: Short haul climb and cruise question...
Replies: 16
Views: 2148

Re: Short haul climb and cruise question...

So cruising flight is just an unavoidable expense that more long haul flights must endure? Ideally they would climb and climb and climb if they could and then descend without any cruise segment? I didn't realize that. Thanks.

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by convair880mfan
Sat Dec 25, 2021 6:32 pm
Forum: Technical/Operations
Topic: Short haul climb and cruise question...
Replies: 16
Views: 2148

Short haul climb and cruise question...

Many years ago I was on a very short flight from Phoenix to Tuscon on an American Boeing 727-200. The plane climbed and descended but there seemed to be no cruise portion of flight [based on my perception of changes in engine pitch]. This also happened while I was on a Delta DC-9-10 flight from Bost...

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by convair880mfan
Thu Dec 23, 2021 6:34 pm
Forum: Technical/Operations
Topic: Do airliners still fly landing patterns?
Replies: 4
Views: 1498

Do airliners still fly landing patterns?

Looking through some old commercial aircraft flight manuals, I find there are usually pages devoted to the subject of how to fly the landing pattern in the aircraft: when to lower flaps and gear and so on. I am wondering whether this kind of thing is still used or whether its use is fading?

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by convair880mfan
Tue Dec 21, 2021 4:31 am
Forum: Technical/Operations
Topic: Boeing 727 Leading Edge Device Question
Replies: 9
Views: 1244

Re: Boeing 727 Leading Edge Device Question

Thanks to all for those explanations. Very, very helpful. I like the link left by CanadianNorth. That is a wonderful article. I bookmarked it. I wish there was something like that for the DC-10.

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by convair880mfan
Mon Dec 20, 2021 9:44 pm
Forum: Technical/Operations
Topic: Very basic question for pilots: How do airliners slow down when they are already at flight idle?
Replies: 31
Views: 3060

Very basic question for pilots: How do airliners slow down when they are already at flight idle?

I imagine any pilot could answer this. At the bottom of the initial descent portion of a flight and when the wings are still clean and the power is at flight idle, how do you slow the aircraft down? Does an aircraft slow when it is leveled off? Raise the nose? I think someone told me that dumping th...

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by convair880mfan
Mon Dec 20, 2021 9:35 pm
Forum: Technical/Operations
Topic: Boeing 727 Leading Edge Device Question
Replies: 9
Views: 1244

Re: Boeing 727 Leading Edge Device Question

Thanks JustAnFO for that information! Someone, I think, told me that the 737 can take off with a flap setting to 2. I'm not sure that is good information, but if it is, I suspect that all the LEDS come at 1 since I can imagine a 37 taking off with some LEDS retracted. Not sure if early 37s had Krueg...

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by convair880mfan
Mon Dec 20, 2021 8:05 pm
Forum: Technical/Operations
Topic: Boeing 727 Leading Edge Device Question
Replies: 9
Views: 1244

Boeing 727 Leading Edge Device Question

The LEDS on the 27 come out in two phases with 4 LEDs coming out at Flaps 2 and the remainder with the selection of Flaps 5. I am wondering what other jetliners use or used such a system. Since many types don't use Krueger flaps and have full-span slats for their LEDS, do other types have the 27 typ...

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by convair880mfan
Wed Dec 15, 2021 10:15 pm
Forum: Technical/Operations
Topic: Holes or gaps in the upper surface of trailing edge flap segments?
Replies: 6
Views: 1394

Re: Holes or gaps in the upper surface of trailing edge flap segments?

DocLightning is right. I am not speaking of the gaps between flap sections called slots. Those form between fore and aft trailing edge flaps in double-slotted designs and between fore, mid and aft trailing edge flaps in triple-slotted designs. I am referring not to something between flaps but on top...

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by convair880mfan
Wed Dec 15, 2021 5:07 am
Forum: Technical/Operations
Topic: Holes or gaps in the upper surface of trailing edge flap segments?
Replies: 6
Views: 1394

Holes or gaps in the upper surface of trailing edge flap segments?

Some airliners have what I can only describe as "holes" or "gaps" in the upper surface of trailing edge flaps. I am pretty sure they are there for the sake of the flap mechanism. The Lockheed L-1011 Tristar has rectangular holes in the middle of both the outboard and inboard trai...

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by convair880mfan
Tue Dec 14, 2021 8:56 pm
Forum: Aviation Hobby
Topic: Is "Jane's All The World's Aircraft" a reliable source of information on aircraft?
Replies: 10
Views: 1155

Is "Jane's All The World's Aircraft" a reliable source of information on aircraft?

Most people can't afford to have the various manuals of all the aircraft types. Even copies are expensive. Some are available online but have pay walls. Wikipedia certainly has its limitations and drawbacks. What about Jane's? Any opinions?

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by convair880mfan
Tue Dec 14, 2021 7:57 pm
Forum: Technical/Operations
Topic: Can anyone identify the various noises on this video of a B737 horiz stab jackscrew in operation?
Replies: 3
Views: 680

Can anyone identify the various noises on this video of a B737 horiz stab jackscrew in operation?

https://youtu.be/rxPa9A-k2xY There seems to be at least three distinct sounds here. Does anyone know what they are? It looks like it would be fairly easy to grease this jackscrew because of the spaciousness of the access space. I am wondering whether Boeing and Airbus horizontal stabilizer jackscrew...

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by convair880mfan
Tue Dec 14, 2021 12:16 am
Forum: Technical/Operations
Topic: Which airliners have two jackscrew assemblies to control their horizontal stabilizer?
Replies: 7
Views: 1282

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

According to the source cited below, the Douglas DC-8 had not one, but two jackscrew assemblies for redundancy in the control of its horizontal stabilizer. Did other airliners also have two? Or do any current models have two? http://iasa.com.au/folders/Safety_Issues/RiskManagement/fsjackscrew-5.html

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by convair880mfan
Mon Dec 13, 2021 7:00 am
Forum: Technical/Operations
Topic: "...low cycle fatigue fracture of a torque tube"?
Replies: 7
Views: 957

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

Thank you for that illustration, Horstroad. It was really helpful to me. I can now envision how the mechanism works and that really helps me understand it better. What you said about the screw bumping into the stops repeatedly with great force, driven by aerodynamic loads makes sense to me too. I am...

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by convair880mfan
Sun Dec 12, 2021 11:10 pm
Forum: Technical/Operations
Topic: "...low cycle fatigue fracture of a torque tube"?
Replies: 7
Views: 957

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

Thank you so much Woodreau. Somehow I missed that. I am reading that portion of the report again and again but am having a bit of trouble visualizing what happened. Does "fracture" mean that the torque tube broke into two pieces? Since the torque tube is inside the acme screw and the acme ...

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by convair880mfan
Sun Dec 12, 2021 8:37 pm
Forum: Technical/Operations
Topic: "...low cycle fatigue fracture of a torque tube"?
Replies: 7
Views: 957

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. According t...

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by convair880mfan
Sun Dec 12, 2021 5:04 pm
Forum: Technical/Operations
Topic: "...low cycle fatigue fracture of a torque tube"?
Replies: 7
Views: 957

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

I've been reviewing the NTSB Accident Report of Alaska Airlines Flight 261 and also the NTSB animation of the failure sequence. There are many diagrams in the report with the various parts labeled. At one point in the report detailing causes of the accident are the words: "The cause of the fina...

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by convair880mfan
Mon Nov 29, 2021 12:14 am
Forum: Technical/Operations
Topic: Oddities on the Flight Deck
Replies: 1
Views: 1436

Oddities on the Flight Deck

A Boeing 727 pilot told me that on the -100, the control yoke was a bit off center. I'm wondering if there are other oddities on the flight decks of other airliners?

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by convair880mfan
Thu Nov 25, 2021 1:11 am
Forum: Technical/Operations
Topic: After mandated changes, are MD-11's now safe?
Replies: 30
Views: 3652

Re: After mandated changes, are MD-11's now safe?

My father was friends with a CEO of a major airline. They were visiting each other once and I heard the CEO say: "Safety is about how many fatalities we can suffer in a year and still convince the traveling public that we are "safe." I was surprised by his comment which seemed to me t...

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by convair880mfan
Wed Nov 24, 2021 11:23 pm
Forum: Technical/Operations
Topic: After mandated changes, are MD-11's now safe?
Replies: 30
Views: 3652

Re: After mandated changes, are MD-11's now safe?

For some reason my "linker" is not working. The changes are actually NTSB recommendations described on pages 72-74 on the NTSB Aircraft Accident Report "Crash During Landing FedEx, Inc. McDonnell Douglas MD-11, N611-FE Newark International Airport Newark New Jeresy [sic] July 31, 1991...

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by convair880mfan
Wed Nov 24, 2021 9:36 pm
Forum: Technical/Operations
Topic: After mandated changes, are MD-11's now safe?
Replies: 30
Views: 3652

After mandated changes, are MD-11's now safe?

Since time has passed since some high-profile FedEx MD-11 crashes, have changes mandated by the FAA to the Boeing Commercial Aircraft Company now made the aircraft safe during takeoffs and landings? I realize this aircraft is no longer used for passenger transportation.

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by convair880mfan
Tue Nov 23, 2021 1:49 am
Forum: Technical/Operations
Topic: Nose cones on TWA Boeing 707's
Replies: 2
Views: 1154

Nose cones on TWA Boeing 707's

I am wondering why some TWA 707's had solid black nose cones, while others had just a small black area on the tip or were all white. Is there a reason for these variously colored nose cones? TWA Convair 880's also had differences in their nose cones.

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by convair880mfan
Tue Nov 16, 2021 5:40 am
Forum: Technical/Operations
Topic: Blow-In Doors on JT8Ds on the Boeing 737-100?
Replies: 5
Views: 1282

Re: Blow-In Doors on JT8Ds on the Boeing 737-100?

That makes sense. Thanks!

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by convair880mfan
Tue Nov 16, 2021 5:38 am
Forum: Technical/Operations
Topic: SOP for flap retraction on the KC-135
Replies: 6
Views: 1401

Re: SOP for flap retraction on the KC-135

Thank you e38. That was just great information. Helped a lot. I should have posted this in the Military Forum.

Was flying the KC-135 a real blast? I know some had turbojets, some turbofans and some those CFM engines. If it isn't too personal a question, which kind did you pilot?

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by convair880mfan
Tue Nov 16, 2021 5:05 am
Forum: Technical/Operations
Topic: Blow-In Doors on JT8Ds on the Boeing 737-100?
Replies: 5
Views: 1282

Blow-In Doors on JT8Ds on the Boeing 737-100?

Does anyone know why the Boeing 737-100 had blow-in doors on the forward part of the engine nacelles like some of the models of the 707? I know the reason for these panels but am wondering why some aircraft engines needed them while others did not. I seem to recall, but could be wrong, that early Bo...

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by convair880mfan
Mon Nov 15, 2021 10:45 pm
Forum: Technical/Operations
Topic: SOP for flap retraction on the KC-135
Replies: 6
Views: 1401

Re: SOP for flap retraction on the KC-135

Yes, that's a nice, nice video. Thanks Aaron747. Is that a compressor stall after touchdown or something else?

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by convair880mfan
Mon Nov 15, 2021 5:53 am
Forum: Technical/Operations
Topic: Is this sound from the APU compressor or the main powerplant compressor?
Replies: 10
Views: 1267

Is this sound from the APU compressor or the main powerplant compressor?

https://youtu.be/dtx3Hfdc05Q

Don't know if the Boeing 727 APU can be operated in the air. Thanks.
-->

There is a high pitched noise during this video. It sounds to me as though the APU was operating during taxi, takeoff and climb. Am I wrong? Is it just compressor noise from the JT8Ds?

https://youtu.be/dtx3Hfdc05Q

Don't know if the Boeing 727 APU can be operated in the air. Thanks.

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by convair880mfan
Mon Nov 15, 2021 3:37 am
Forum: Technical/Operations
Topic: SOP for flap retraction on the KC-135
Replies: 6
Views: 1401

SOP for flap retraction on the KC-135

This question is for current or former KC-135 pilots. On the KC-135, if takeoff is made at a flap setting of 30: during clean-up do you retract the flaps first to 20 and then UP or do you retract to UP from 30 without stopping at 20? Or does it depend on other factors? Also . . . A Boeing 707 pilot ...

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by convair880mfan
Sat Nov 13, 2021 1:35 am
Forum: Technical/Operations
Topic: When jetliners are offered with multiple powerplant options, how do they decide which to choose?
Replies: 11
Views: 2992

Re: When jetliners are offered with multiple powerplant options, how do they decide which to choose?

That is very interesting, 77west. Can you or someone else elaborate on "rating plugs." Are these the same as "ID" plugs. ? http://nandang-smart.blogspot.com/2014/09/cfm56-7b-identification-plug.html I wonder if the DC-10-15s for "hot and high" airports used what you cal...

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by convair880mfan
Fri Nov 12, 2021 3:26 am
Forum: Technical/Operations
Topic: Does anyone know what the highest thrust JT8D engine was ever used on a Boeing 737-100?
Replies: 3
Views: 626

Re: Does anyone know what the highest thrust JT8D engine was ever used on a Boeing 737-100?

Thank you CrewBunk. That is very helpful. Someone pointed me to a document called "The DOT FAA Type Certificate Data Sheet." Sept 01, 2010. According to this document the following are approved Boeing 737-100 Engines: Two Pratt & Whitney JT8D-7, JT8D-7A, JT8D-7B, JT8D-9, JT8D-9A and JT...

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by convair880mfan
Fri Nov 12, 2021 2:15 am
Forum: Technical/Operations
Topic: Does anyone know what the highest thrust JT8D engine was ever used on a Boeing 737-100?
Replies: 3
Views: 626

Does anyone know what the highest thrust JT8D engine was ever used on a Boeing 737-100?

Or does anyone know a source for this information, preferably an online source without a pay wall? Could a Boeing 737-100 take any version of the Pratt and Whitney turbofan up to the -17R? Not interested in if this would or would not make economic sense. The 737-100 wasn't that popular compared to i...

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by convair880mfan
Thu Nov 11, 2021 9:40 pm
Forum: Technical/Operations
Topic: When jetliners are offered with multiple powerplant options, how do they decide which to choose?
Replies: 11
Views: 2992

When jetliners are offered with multiple powerplant options, how do they decide which to choose?

Sometimes I see that a jet airliner can be bought with either lower or higher thrust powerplants. Usually the higher thrust version of the powerplant are heavier but offer better takeoff performance all other things remaining equal. The Boeing 737-500 , for example, was offered with either the 18,50...

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by convair880mfan
Thu Nov 11, 2021 8:32 pm
Forum: Technical/Operations
Topic: When pilots speak of a specific type of aircraft as "unforgiving" does that indicate a design flaw?
Replies: 15
Views: 2669

Re: When pilots speak of a specific type of aircraft as "unforgiving" does that indicate a design flaw?

I wonder if McDonnell Douglas should have just stretched the DC-10 or perhaps made a twin engine aircraft right off the bat. The design of an aircraft is a job for many engineers. I would think the engineers at MD had plenty of expertise and experience with those with the most expertise and experien...

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by convair880mfan
Tue Nov 09, 2021 8:06 pm
Forum: Technical/Operations
Topic: Pilots wearing gloves during flight?
Replies: 10
Views: 3276

Pilots wearing gloves during flight?

On some flight deck videos, I have noticed pilots wearing gloves. Seems more common for military pilots although my knowledge is scant. I was watching pilots of a KC-135 and an AWAC aircraft and they were wearing gloves. Some flight deck videos of Japanese carriers show the pilots wearing thin white...

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by convair880mfan
Thu Nov 04, 2021 6:49 pm
Forum: Technical/Operations
Topic: What causes the pause on some aircraft between the time the nose is lifted off and the mains break free?
Replies: 11
Views: 1699

What causes the pause on some aircraft between the time the nose is lifted off and the mains break free?

I have experienced this on the Boeing 727 during takeoff. The nose is rotated and then it just hangs there for a bit before the mains break free with that "thud" sound of fully extended struts. Also noticed this on videos of the DC-8 which almost seems to hover before completely lifting of...

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by convair880mfan
Sat Oct 30, 2021 3:35 am
Forum: Technical/Operations
Topic: Why didn't Airbus design the A-380 wing with a great wing sweep.
Replies: 14
Views: 2135

Re: Why didn't Airbus design the A-380 wing with a great wing sweep.

Is the Boeing 747 the fastest non-supersonic jetliner? And if so, does the wing sweep have something to do with that. Are there airliners with the newer supercritical wings that can match the 747 for speed? Not sure speed is a big deal anymore since crowded airports and other delays eat up any speed...

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by convair880mfan
Sat Oct 30, 2021 1:35 am
Forum: Technical/Operations
Topic: Why didn't Airbus design the A-380 wing with a great wing sweep.
Replies: 14
Views: 2135

Why didn't Airbus design the A-380 wing with a great wing sweep.

Wing sweep on the Boeing 747 is 37.5 degrees at quarter chord. This allows it a higher Mach cruise speed. I am curious why Airbus didn't adopt such a highly swept wing for its A-380 and other long range aircraft? [Apparently the A380 has a double swept wing.] For that matter, why didn't Boeing adopt...

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by convair880mfan
Sat Oct 30, 2021 1:15 am
Forum: Technical/Operations
Topic: Why didn't airline makers follow the lead of the Lockheed L-1011 and use stabilators instead of THS?
Replies: 7
Views: 1864

Why didn't airline makers follow the lead of the Lockheed L-1011 and use stabilators instead of THS?

Many people have said that the Lockheed L-1011 was ahead of its time in many of its features. One of its features was the use of an all-flying tail in place of the traditional trimmable horizontal stabilizer. If this was a good idea, why wasn't it used in later jetliner designs? Anyone know?

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by convair880mfan
Thu Oct 28, 2021 7:49 pm
Forum: Technical/Operations
Topic: What does slat extension do to the attitude of an aircraft on approach?
Replies: 7
Views: 886

What does slat extension do to the attitude of an aircraft on approach?

Does the nose balloon up and are trim changes necessary after slats are extended? Does it depend on the aircraft? Am mostly interested in the DC-10 and MD-11 but would value information on any aircraft? Which leading/trailing edge flap or slat settings require the largest trim changes? I mentioned i...

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