Search found 656 matches

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by DH106
Sun Jul 11, 2021 9:18 am
Forum: Technical/Operations
Topic: Bump on Boeing 737-200 engine
Replies: 9
Views: 1514

Re: Bump on Boeing 737-200 engine

Almost certainly covering part of the flap carriage which probably protrudes slightly at some flap angle.

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by DH106
Fri Jun 11, 2021 1:10 pm
Forum: Civil Aviation
Topic: The Giant aircraft That Failed
Replies: 59
Views: 18706

Re: The Giants That Failed

Boeing757100 wrote:
I think that another big flop was the Bristol Brabazon.


That was British though, not American.
The OP was dealing initially with American.

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by DH106
Wed Jun 09, 2021 2:29 pm
Forum: Technical/Operations
Topic: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?
Replies: 92
Views: 13869

Re: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?

'Getting more performance out of the wing' has to be the least valid point I've heard when comparing the different flight control philosophies. Starting with the dubious claim that you'll be closer to max lift when at the limit of stick shaker than you would be with max aft stick. That may or may n...

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by DH106
Wed Jun 09, 2021 8:11 am
Forum: Technical/Operations
Topic: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?
Replies: 92
Views: 13869

Re: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?

The stall begins at CLmax by definition, but I take your point about it being progressive.
For that reason, presumably in a Boeing if you fly the max energy line and there are no margins, you'd be in stick shaker?

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by DH106
Tue Jun 08, 2021 7:05 pm
Forum: Technical/Operations
Topic: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?
Replies: 92
Views: 13869

Re: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?

If it was at CLmax, there would be a stick shaker. There is none. Well the Boeing 'line' can't be at CLmax either for the same reason. Common sense and safety would dictate that Boeing would also apply a margin below the absolute CLmax - otherwise the slightest overshoot by the pilot would stall th...

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by DH106
Tue Jun 08, 2021 11:24 am
Forum: Civil Aviation
Topic: AA B38M Birdstrike at SVD
Replies: 33
Views: 7095

Re: AA B38M Birdstrike at SVD

Prior to the rejection, the aircraft looked very 'nose-up' with the nosewheel barely on the ground. Is this usual? I've never seen a 737 with that attitude on take-off.

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by DH106
Tue Jun 08, 2021 10:39 am
Forum: Technical/Operations
Topic: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?
Replies: 92
Views: 13869

Re: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?

2) On an Airbus, you pull the sidestick all the way back. I agree. However, you are not Max Performing the wing. You are coming close but you're not there. On the Boeings, you are right at the stick shaker. It is not difficult to pull right to the max energy line on the PFD. If you can fly an ILS o...

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by DH106
Mon Jun 07, 2021 2:45 pm
Forum: Technical/Operations
Topic: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?
Replies: 92
Views: 13869

Re: For Pilots. What is Your Most Enjoyable Commercial Aircraft to Fly?

VMCA787 wrote:
... but it was obvious the design philosophy was to take options away from the pilot.


Interesting, what options does it take away from a pilot? To stall? To fly inverted? To botch a CFIT escape perhaps?

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by DH106
Tue Apr 13, 2021 4:33 pm
Forum: Civil Aviation
Topic: NTSB Renews Calls for Cockpit Video Recorders
Replies: 344
Views: 23229

Re: NTSB Renews Calls for Cockpit Video Recorders

Well, if you look at how many CVR audios are now in the public domain, the concerns are understandable.
It'd be a goon's wet dream to have cockpit crash vid. Some sick people around.

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by DH106
Thu Mar 11, 2021 8:14 pm
Forum: Technical/Operations
Topic: Holding the nose wheel off
Replies: 35
Views: 4165

Re: Holding the nose wheel off

CosmicCruiser wrote:
Holding the nose wheel off certainly won't adhere your landing distance data.


Adhere it to what?!

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by DH106
Tue Mar 09, 2021 10:41 pm
Forum: Travel, Polls & Preferences
Topic: Why no Boeing 707 stretch?
Replies: 19
Views: 3933

Re: Why no Boeing 707 stretch?

I think the 720 was the same length as the original -100?
There was the -138 shrink case specially for Qantas

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by DH106
Fri Mar 05, 2021 12:16 pm
Forum: Technical/Operations
Topic: Holding the nose wheel off
Replies: 35
Views: 4165

Re: Holding the nose wheel off

If you hold the nosewheel off you risk slowing to a speed where the tail stalls. That will lead to the nose gear coming down rather too rapidly. I'm not sure the tailplane/elevators will actually get anywhere near their stalling AOA - the aircraft-on-the-ground geometry in most cases wouldn't allow...

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by DH106
Sun Feb 07, 2021 11:39 pm
Forum: Civil Aviation
Topic: A Cat's Tale: A cat got locked in El Al's 739, probably since the plane's last flight on January 24th 2021.
Replies: 47
Views: 10123

Re: A Cat's Tale: A cat got locked in El Al's 739, probably since the plane's last flight on January 24th 2021.

ntehrani wrote:
There's a picture in the SimpleFlying of kitty safe in the cockpit window. :)


A purrrrr-fect ending to the story :)

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by DH106
Mon Feb 01, 2021 10:03 am
Forum: Technical/Operations
Topic: Air scoops on B-36 prop blades
Replies: 3
Views: 1694

Re: Air scoops on B-36 prop blades

Think they're exit vents for the prop heating air?

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by DH106
Thu Jan 21, 2021 10:38 am
Forum: Civil Aviation
Topic: Sriwijaya Air 737-500 (SJ182 CGK-PNK) crashes shortly after takeoff
Replies: 866
Views: 255112

Re: Sriwijaya Air 737-500 (SJ182 CGK-PNK) crashes shortly after takeoff

A tail should never have broken off because of rudder use unless of mechanical failure unrelated to pilot control or because of loss of control. The limiters should have been designed to handle eliminate that possibipity. Was he a knucklehead for being overly aggressive sure but that's where it sho...

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by DH106
Sat Dec 12, 2020 10:41 pm
Forum: Technical/Operations
Topic: Why does 787(and maybe A350) landing gear looks titled down instead of up during departure?
Replies: 28
Views: 4232

Re: Why does 787(and maybe A350) landing gear looks titled down instead of up during departure?

That prompts the question: why did they design it that way? I imagine having the structure further inboard may have saved some weight. If it's measurably better, why did other types not converge to this design? Why put the legs further out if it adds weight? In the case of Concorde, the necessary l...

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by DH106
Sat Dec 12, 2020 1:15 pm
Forum: Technical/Operations
Topic: Why does 787(and maybe A350) landing gear looks titled down instead of up during departure?
Replies: 28
Views: 4232

Re: Why does 787(and maybe A350) landing gear looks titled down instead of up during departure?

I think the 330/340 oleo is designed to depressurize so they can squeeze it in the bay. I'm not sure exactly how it works or why it was designed that way though.... They designed it that way to make it fit. ;) The oleo is not depressurised. There's a mechanical thingamabob called the "shorteni...

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by DH106
Mon Dec 07, 2020 2:06 pm
Forum: Technical/Operations
Topic: Why does 787(and maybe A350) landing gear looks titled down instead of up during departure?
Replies: 28
Views: 4232

Re: Why does 787(and maybe A350) landing gear looks titled down instead of up during departure?

If you wanna see some REALLY confused landing gear, check out A340. Side ones tilted back, middle one tilted forward. That's only on the A340 500/600 - prior versions only had a twin wheel centre gear. I suspect the reason for the forward tilting middle bogie is - as it's forward retracting - to al...

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by DH106
Mon Dec 07, 2020 9:03 am
Forum: Technical/Operations
Topic: Why does 787(and maybe A350) landing gear looks titled down instead of up during departure?
Replies: 28
Views: 4232

Re: Why does 787(and maybe A350) landing gear looks titled down instead of up during departure?

If you wanna see some REALLY confused landing gear, check out A340. Side ones tilted back, middle one tilted forward. That's only on the A340 500/600 - prior versions only had a twin wheel centre gear. I suspect the reason for the forward tilting middle bogie is - as it's forward retracting - to al...

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by DH106
Mon Nov 30, 2020 11:21 pm
Forum: Technical/Operations
Topic: Those who fly airplanes with FBW flight envelope protections
Replies: 32
Views: 41462

Re: Those who fly airplanes with FBW flight envelope protections

AF447 wasn't deep stalled in the generally accepted sense where the wing blankets the tail surfaces. It remained stalled primarily because one of the pilots maintained back pressure on the stick for a large portion of the descent whilst in alternate law (thus without the protections). That situation...

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by DH106
Wed Nov 25, 2020 10:05 am
Forum: Technical/Operations
Topic: Il-86 Performance
Replies: 54
Views: 9948

Re: Il-86 Performance

I have seen multiple videos/photos where Il-86 are barely able to takeoff the runway (as in post #3). I know the type doesn’t operate anymore (in civilian service), but is it even legal to push an aircraft like that? What about an engine failure? Won’t you have a really low V1 as the runway has bee...

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by DH106
Sat Oct 31, 2020 9:02 pm
Forum: Technical/Operations
Topic: Some Questions About the 707 Family
Replies: 6
Views: 1645

Re: Some Questions About the 707 Family

GalaxyFlyer wrote:
The ventral fin was added at the requirement of the British ARB, D.P.Davies wrote about it in his book, “Handling the Big Jets”


Indeed - there's an audio interview with D.P. Davies on the internet recorded back in 1992, part of which deals with his certification issues with the 707.

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by DH106
Sat Oct 17, 2020 9:42 am
Forum: Technical/Operations
Topic: B747 Leading Edge Slats
Replies: 9
Views: 2227

Re: B747 Leading Edge Slats

Viper911 wrote:
Actually they're called krueger flaps not slats.


Boeing actually calls the outer flexible ones 'slats', presumably because they leave a gap between themselves and the LE as slats do.
However I think most people would consider them kruegers due to the way they deploy.

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by DH106
Wed Oct 14, 2020 10:01 am
Forum: Technical/Operations
Topic: Off position for landing gear handle
Replies: 24
Views: 5200

Re: Off position for landing gear handle

Max Q wrote:
Just as a note of trivia the 767-400 mlg free falls to the down position even with normal extension


Just on the -400?
I ask as I'm constantly amazed at the huge springs present on the 767 main gear - obviously there to assist the free fall extension.

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by DH106
Sat Oct 10, 2020 11:00 am
Forum: Civil Aviation
Topic: Wizz Air A321 substituted for an A320 had take-off issue
Replies: 49
Views: 7931

Re: A320 substituted for an A321 had take-off issue

Just to be clear, a 321 was substituted for a 320, not vice versa.

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by DH106
Fri Sep 18, 2020 3:13 pm
Forum: Technical/Operations
Topic: Why no more multi-slot flaps?
Replies: 32
Views: 4614

Re: Why no more multi-slot flaps?

ElroyJetson wrote:
Those Krueger flaps were complex but worked beautifully.


The Krueger flaps are actually quite simple, on the inner leading edges. Are you referring to the triple slotted trailing edge flaps perhaps?

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by DH106
Wed Sep 09, 2020 10:21 pm
Forum: Technical/Operations
Topic: Boeing 727 flap sequence
Replies: 26
Views: 2575

Re: Boeing 727 flap sequence

The slat extension on the 727 is quite quirky as well:- 2 of the slat sections (but not the most outboard nor inbard sections) extend first at a certain flap setting. The rest of the slats + the kreugers extend at the next flap setting.

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by DH106
Fri Aug 28, 2020 10:13 am
Forum: Civil Aviation
Topic: Easyjet sued for discrimination by woman forced to move seat
Replies: 125
Views: 13578

Re: Easyjet sued for discrimination by woman forced to move seat

mrbonfire wrote:
While this is all wrong, I think that by admitting she moved voluntarily, she's damaged her legal case for taking action.


Well perhaps she felt she had to move 'voluntarily' for fear of being removed from the plane for being obstructive - is the situation clear here?

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by DH106
Wed Aug 26, 2020 4:38 pm
Forum: Civil Aviation
Topic: Easyjet sued for discrimination by woman forced to move seat
Replies: 125
Views: 13578

Re: Easyjet sued for discrimination by woman forced to move seat

If your religion requires something non-standard/out of the ordinary it is up to YOU to ensure that accommodation for yourself, not a secular airline's. Whether it's pre-ordering a religious meal or somehow ensuring you have an empty seat next to you because you cannot sit next to a non-familial wo...

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by DH106
Sun Aug 23, 2020 4:01 pm
Forum: Civil Aviation
Topic: Kuwait Airways 777 unusual (wrong go around?) landing at EHAM
Replies: 48
Views: 10438

Re: Kuwait Airways 777 unusual (wrong go around?) landing at EHAM

Looks like he held it off & then stalled onto the runway from about 10ft

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by DH106
Fri Aug 07, 2020 1:08 pm
Forum: Civil Aviation
Topic: Atlas B744, PVG, Aug-5-2020: triple engine pod strike
Replies: 56
Views: 19263

Re: Atlas B744, PVG, Aug-5-2020: triple engine pod strike

It’s occurred before. https://assets.publishing.service.gov.uk/media/5422f015e5274a13170002e5/Boeing_747-412__B-KAG_06-09.pdf According to the pitch roll chart contained in the above report, there's a small corner of the pitch/roll envelope that allows the inner nacelle to strike before the outer. ...

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by DH106
Sun Aug 02, 2020 11:08 am
Forum: Technical/Operations
Topic: Landing Gear retraction
Replies: 11
Views: 2302

Re: Landing Gear retraction

LH707330 wrote:
Also, most airliners (exception: some early 727s that then mostly had them yanked because they were not super useful) don't have brakes on the nose gear, so without the snubbers they'd just keep spinning.


+ the Convair 880/990, which had nodewheel brakes.

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by DH106
Wed Jul 29, 2020 1:55 pm
Forum: Technical/Operations
Topic: Landing Gear retraction
Replies: 11
Views: 2302

Re: Landing Gear retraction

As discussed on another thread, gyroscopic forces only come into play when the angle of the wheel axis changes during retraction e.g. sideways retracting gear, not forwards/backwards retracting. Another good reason to brake during retraction is in the case of a damaged tire to prevent any flaling tr...

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by DH106
Mon Jul 06, 2020 1:07 pm
Forum: Civil Aviation
Topic: Comet: why no front left door?
Replies: 8
Views: 2743

Re: Comet: why no front left door?

I suspect 'front left boarding' wasn't standardised back in those days and deHavilland chose to board at the rear left.
I guess before the age of front-in parking & borading jetways it didn't really matter - front or rear.

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by DH106
Thu Jun 25, 2020 10:59 am
Forum: Civil Aviation
Topic: PIA A320 (flight PK8303) crashes in Karachi
Replies: 740
Views: 205510

Re: PIA A320 (flight PK8303) crashes in Karachi

An Airbus a320 does not let you forget. Even if you forget, you will be reminded repeatedly and loudly. I never said they 'forgot' - just that the gear was inadvertently retracted after it's initial deployment. I suspect they were being subjected to many aural warnings which was perhaps why the gea...

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by DH106
Wed Jun 24, 2020 9:21 pm
Forum: Civil Aviation
Topic: PIA A320 (flight PK8303) crashes in Karachi
Replies: 740
Views: 205510

Re: PIA A320 (flight PK8303) crashes in Karachi

I think that one of them extended the gear for additional drag during the descent. Then when they intercepted the glide slope, a crew member - could be the same or the other one - went through the approach routine "lower the gear" and moved the lever again. Since this is a routine event, ...

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by DH106
Wed Jun 03, 2020 2:20 pm
Forum: Civil Aviation
Topic: PIA A320 (flight PK8303) crashes in Karachi
Replies: 740
Views: 205510

Re: PIA A320 (flight PK8303) crashes in Karachi

It's clear from the extended 3x scrapes along the runway that the pilots expected the gear to be down & were attempting to land rather than a low pass. The very high descent rate during the approach lends belief that the gear was perhaps down at that point, but was then retracted prior to the la...

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by DH106
Wed Jun 03, 2020 8:13 am
Forum: Civil Aviation
Topic: PIA A320 (flight PK8303) crashes in Karachi
Replies: 740
Views: 205510

Re: PIA A320 (flight PK8303) crashes in Karachi

My theory is that they lowered the gear early to facilitate the large descent rate, then during an extremely late, rushed & confused landing checklist, toggled the gear back up on the 'Gear Down' call. It's clear that whatever happened - there wasn't any "3 greens" check.

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by DH106
Tue May 26, 2020 8:28 am
Forum: Civil Aviation
Topic: PIA A320 (flight PK8303) crashes in Karachi
Replies: 740
Views: 205510

Re: PIA A320 (flight PK8303) crashes in Karachi

How about: They were high and fast on the first approach, so they drop the gear & descend rapidly. Approach/landing checklist is really rushed and on 'Gear Down' call the PNF - rushed & flustered & without thinking properly - merely TOGGLES the gear back up. Again beacuse of the rush, no...

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by DH106
Tue Feb 25, 2020 6:36 am
Forum: Civil Aviation
Topic: French Bee Airbus A350 Loses Speed & Altitude During Go Around
Replies: 22
Views: 7896

Re: French Bee Airbus A350 Loses Speed & Altitude During Go Around

If they encountered wind shear and went around, then on exiting a micro-burst the ground speed may have been considerably in excess of their airspeed i.e. there'd be considerable tailwind component. Thus their airspeed might have been much lower than 290Kts

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by DH106
Sun Feb 16, 2020 10:42 pm
Forum: Technical/Operations
Topic: Wheel retraction question
Replies: 12
Views: 2619

Re: Wheel retraction question

kalvado wrote:
If I remember correctly, A-380-800 doesn't have a full set of brakes on mains. How they handle the free axle?


The brakeless wheel axles are on the body gears which don't change orientation/direction on retraction, so those gyroscopic forces don't come into play.

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by DH106
Fri Feb 14, 2020 2:34 pm
Forum: Technical/Operations
Topic: Wheel retraction question
Replies: 12
Views: 2619

Re: Wheel retraction question

I guess it depends what “active positioning” means. Once the gear is off the ground, the bogie is automatically positioned at the correct angle to enter the wheel well. If the bogie is not in the proper position, the gear handle will not move from the down position. I think we mean the same thing h...

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by DH106
Fri Feb 14, 2020 8:14 am
Forum: Technical/Operations
Topic: Wheel retraction question
Replies: 12
Views: 2619

Re: Wheel retraction question

Okay - I stand corrected, the 767 bogie is actively positioned during retraction?
In the previous thread I mentioned one poster stated that the gear retracts with the bogie in it's default nose-down position, with no active positioning for retraction.

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by DH106
Thu Feb 13, 2020 11:18 pm
Forum: Technical/Operations
Topic: Wheel retraction question
Replies: 12
Views: 2619

Re: Wheel retraction question

.... if the main gear has multiple axles on the bogie beam, such as a 757, 767, etc, the bogie must be centered upon gear retraction to go up into the gear well. This is done by a actuator on the bogie beam. Not necessarily actively 'centered', the 767 I believe for example has no active bogie posi...

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by DH106
Tue Dec 03, 2019 6:33 am
Forum: Civil Aviation
Topic: TE901 28th November 1979 - 40th anniversary
Replies: 46
Views: 6034

Re: TE901 28th November 1979 - 40th anniversary

FGITD wrote:
As I recall, there's actually a photo out there taken literally at the moment of impact. As a sightseeing flight, I'm sure more than a few people were filming or taking photos at the exact moment.


Indeed - that photo was published in Gordon Vette's book "Impact Erebus"

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by DH106
Sun Dec 01, 2019 10:24 pm
Forum: Civil Aviation
Topic: TE901 28th November 1979 - 40th anniversary
Replies: 46
Views: 6034

Re: TE901 28th November 1979 - 40th anniversary

I don't think there'll ever be a concensus on this one. As air crash causes go this is probably the most devisive one I know.
Regardless of the pilots' culpability or not though, Air New Zealand's conduct was shameful.

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by DH106
Sun Nov 03, 2019 4:57 pm
Forum: Civil Aviation
Topic: Three Near Disasters...an amazing piece of aviation history!
Replies: 14
Views: 7860

Re: Three Near Disasters...an amazing piece of aviation history!

Wonder how the Sunderland landed with a hole in the keel. Perhaps they landed on water and beached it before it could sink.

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by DH106
Fri Jun 21, 2019 7:49 pm
Forum: Technical/Operations
Topic: RC turbine engine failing to start on the B3 helicopter
Replies: 2
Views: 1161

Re: RC turbine engine failing to start on the B3 helicopter

As an RC turbine flier, low RPM failure to start smacks of bad turbine battery.

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by DH106
Thu Apr 04, 2019 9:35 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 767368

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

For all those asking why didn't the pilots reduce speed:- the aircraft's airspeed is inextricably linked to the pitch trim - you can't just throttle back and expect the speed to bleed off with no pitch trim change.The aerodynamics of a stable aircraft tries to maintain the same airspeed, thus thrott...

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by DH106
Thu Dec 20, 2018 10:37 pm
Forum: Civil Aviation
Topic: Gatwick drone closures
Replies: 547
Views: 74724

Re: Gatwick closed because of 2 drones

Some changes to the regulation may be expected after this incidence, such as, whoever owns a drone in the UK must need to be registered and all drones need to have unique serial numbers for the police to track down the owners, if they manage to bring down the drones in the events like this one. Yes...

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