Airliners.net

StereoTechque

Re: ATR 72-600 beacon

The Q400 also does not have a Red beacon for flight.
It has a single red beacon on fuselage top for Eng start/taxi ops.

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StereoTechque

Re: Radome installation on Airframes impacting aerodynamic profile

Wifi Radome is the same as a Satcom radome mounted on top of Airliner fuselage correct?

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StereoTechque

Re: ATR 72-600 beacon

TR wrote:
Having spotted a bit I have noticed that some ATR72-600 have the usual red beacons whereas other have a clear white beacon both under the belly and on top of the tail. Anyone know why there is this difference? Thanks
TR

It's a customer option. You can have either color per your preference.

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StereoTechque

Re: Propeller aircraft with leading edge slats?

Newark727 wrote:
The Helio Courier!

Thanks for the example!

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StereoTechque

Re: Blinking/Flashing Nav lights

Yes those are the ones I was talking about. I think many new military aircrafts still retain them.

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StereoTechque

Re: A321 Freighter P2F vs PCF

zkojq wrote:

Precision doesn't have an A320 conversion program, so didn't need to worry about commonality.

Super.
Thank you!
I think no other major differences between the two 321s I suppose.

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StereoTechque

Re: Blinking/Flashing Nav lights

GalaxyFlyer wrote:
Yes, we had them. We used them to signal, but I can’t remember the signals. Was that designed or not, I can’t say. I do remember, at night, steady meant ready for take-off.

Thank you. Equipment?

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StereoTechque

Blinking/Flashing Nav lights

I have observed such lights on Fighter aircrafts/also a few old Soviet Transport aircraft.
Could not find any documents regarding why they are not steady as the civilian counterparts.

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StereoTechque

A321 Freighter P2F vs PCF

A321 PCF(Precision) accomodates same number of ULDs as P2F(EFW) on the Main deck while retaining the old L1/R1 Pax door configuration without any structural mod.
Can anyone explain how Precision was able to achieve that.
Also any further comparison between the two types are welcome.

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StereoTechque

Re: A32x Side Stick- What is the Removable Plate on Top?

WesternDC6B wrote:
What is the red button? Bomb release?

Imaginary bomb release alongwith Autopilot disconnect.

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StereoTechque

Re: A32x Side Stick- What is the Removable Plate on Top?

thefactorypilot wrote:
It looks like something was originally there from certification and they just covered it with a blanking plate.

Access to wiring in case Sidestick PTT is stuck and is continuously transmitting.
There are two wires inside that we have to cut and stow per the AMM.

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StereoTechque

Re: Pitot-Static Tubes

Well it is like having two ways of doing one job.
Both have its pros and cons.
A320 for example has separate pitot and static ports on fuselage. Depends on how the manufacturer designs the Aircraft.

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StereoTechque

Re: ATR loading

CRJ900 wrote:
Does the ATR 72 have decent cargo hold capacity compared to the Dash 8-400?

Rear Cargo hold is pretty much same for all Pax versions.
The airline I work for has configured a tight 78 Pax on the ATR72, so the Forward hold is indecent.

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StereoTechque

Re: N1 vs EPR

https://theflyingengineer.com/flightdec ... ndication/

StereoTechque

Re: Sand Bag Use

Here at AMS we usually have bags with gravel/rocks, less of a problem if one ruptures in the hold I guess. But I've seen a certain Q400 operator use stackable blocks of 25 kilos. Yes best to have Ballast loaded with rocks then sand. Sand is a nightmare if it gets into Avionics/recirculation system.

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StereoTechque

Re: South African Air Force 707

Max Q wrote:
Under the R1 passenger door a large structure is attached to the fuselage, does anyone know what it is ?

Looks like a fuselage mounted Side scan radar.

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StereoTechque

Re: Turboprop Airliners and Blade Failures

flipdewaf wrote:
when there is a separation event there is only 1 force remaining and that’s the thrust as the centripetal force disappears, it is now just a velocity. Ignoring drag of course..

Centrifugal force is the most prominent though...

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StereoTechque

Re: Turboprop Airliners and Blade Failures

Not necessarily, since the "strike zone" of a shedded blade onto the fuselage is forward of the propeller's rotational plane. The forces that act on the blades are forward (thrust) because the blades are pushing air backwards. Hi, are you sure about this? Wouldn't the high rpm of the Prop...

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StereoTechque

Re: Turboprop Airliners and Blade Failures

Regulation mandates modern Turbofan engines to have a containment duct which encloses the Fan cowling area of the engine.
Shouldn't the ice shield also designed as a protection device in case of prop blade liberation.?

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StereoTechque

Re: Can steel brake pads be used in systems designed for carbon?

Slightly off-topic but do Carbon multi disc brakes have negative expansion coefficient?
Like do the wear indicating pins come slightly out when brakes are cooled off?

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StereoTechque

Re: APU Thrust?

HowardDGA wrote:
Can APUs produce any meaningful thrust? And would it have any effect on an aircraft’s ETOPS certification?

Any little bit of thrust APU will produce is practically meaningless.

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StereoTechque

Re: Portable External Oil Cooler

You must be referring to an External Hydraulic Cart. It is used in heavy Maintenance eg when the Aircrafts own Hydraulic pumps are not available for maintenance.
They are a source of hydraulic pressurisation.

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StereoTechque

Re: Is an Aircraft Perfectly Balanced 50/50?

Not sure how to phrase the question - but is a Boeing 787 or Airbus A321 without the airline customers configuration of seats, etc., perfectly balanced 50/50? If you were to draw a line down the middle of the plane, would both sides be equal in weight? Whether an Aircraft is loaded or no it always ...

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StereoTechque

Re: CFM Engine High Oil Consumption

Is there not also something about the turbine bearing seals not fully pressurizing at low RPM and thus aircraft that tend to have longer than normal taxiing can end up with higher oil consumption? Correct. But this holds true for Labyrinth seals. Almost all modern engines use Carbon seals which hav...

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StereoTechque

Re: CFM Engine High Oil Consumption

viewtopic.php?p=23286961
.

StereoTechque

Re: CFM Engine High Oil Consumption

I guess we drifted too far away with examples.
The question is why no Deoiler on the CFMs?

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StereoTechque

Re: CFM Engine High Oil Consumption

GalaxyFlyer wrote:
Golly, you should see PW engines, if you want to see oil consumption.

Quite the contrary on the PW GTF. Max oil consumption is as low as 0.22 qts/hr.

CFM LEAP on the other hand max consumption is 0.45 qts/hr.

All above examples are used on the A320.

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StereoTechque

CFM Engine High Oil Consumption

Why do all CFM Engines consume a large quantity of oil.
More importantly what is stopping them to incorporate a Deoiler in The Oil Vent subsystem to reduce consumption?

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StereoTechque

Re: Aircraft Certification Problems

@Mods Should this thread be transferred to Tech/Ops considering the detailed discussion on type certification?

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StereoTechque

Re: Location of data plate on Airbus aircraft

On the A320s of the company I work for, data plates are located on three locations - top of L1 and R1 door frames, Bolted side of cockpit wall

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StereoTechque

Re: A320Neo new landing light location

I have flown aircraft where the landing lights were at the wing root or adjacent to the main landing gear (Boeing/Airbus) as well as at the wingtip (McDonnell Douglas) and to be honest, I couldn't tell much difference in the scope of illumination. e38 True. Look at B737MAX, All the lights in the wi...

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StereoTechque

Re: A320Neo new landing light location

The new ones seem great for reducing drag, must be better than the predecessor too for illumination as they are located much ahead..
I hope Airbus have changed the beam to neutral white.
The current LED ones on A320N bite the eye if viewed head on.

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StereoTechque

Re: Pre-Departure Walkaround Top of Fuselage

Had a quick question - when it comes to commercial airliners and the pre-departure walk around how do you assess whether there are any issues with the top of the aircraft? Transit/Preflight checks are approved for a check of the aircraft from the ground as far as the eye can see and follow a partic...

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StereoTechque

Re: Pneumatic vs Hydraulic

I see scope in following two systems in the years to come:

Heavy Duty Electrical Actuators.
High Pressure(upto 5000psi) Hyd Actuators.

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StereoTechque

Re: The sound of a big turboprop

The sound of the propeller running outperforms the sound of the jet engine inna turboprop as core size is relatively small.

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StereoTechque

Re: Tire Pressure on A32X Family

Wacker1000 wrote:

^This. The longer fuselage and location of CG puts less weight on the nose of a longer aircraft.

Yes that is exactly I think the reason is.
In fact if we continue to fill up same pressures as the shorter siblings, it will result in Nose tyre a bit lightly loaded causing Crown wear of the tyre

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StereoTechque

Re: Tire Pressure on A32X Family

Horstroad wrote:
B777 tire pressures for maximum airplane gross weight in psig (sorted by MTOW):

So Boeing also pretty much has the same trend for the family aircraft.
Longer the jet, slightly lesser the pressure of the Nose wheel.

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StereoTechque

Re: Tire Pressure on A32X Family

Thanks CanadianNorth & m1m2.

Looks like Nose wheel on A321 carries a bit less load than the A320.
But what difference would it make if we keep the same pressure for Nose wheel on longer jets. Won't it ensure fleet commonality?

Any idea the trend on widebody families like A332/333 and B772/773?

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StereoTechque

Re: Peeling paint on composite surfaces.

Conventional aluminium alloy surfaces are far better for paint adhesion as compared to composites especially Carbon fibre.

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StereoTechque

Tire Pressure on A32X Family

At the company I work for we maintain following Tire Pressures on the A32X Family Aircrafts. A320 - NLG 178 to 187 & MLG 200 to 210. A321 - NLG 168 to 177 & MLG 212 to 222. While I do understand the increase in MLG Tire pressure on A321 due to the obvious load increase, I could not find any ...

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StereoTechque

Re: Airbus WISE vs TFU vs ISI

ISI : Mainly for operators, there is no particular template. TFU: Made to describe a specific technical issue, from Background description to Final Solution (with mitigation and recommendations inbetween) Thanks LD!! Just came across this text from one of the Airbus OIT- 3.2 FEATURES SPECIFIC TO TF...

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StereoTechque

Re: A321LR flight level?

A321 LR like the A320 family is maxxed out at FL390 per the AFM.
Unsure about the XLR though.

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StereoTechque

Airbus WISE vs TFU vs ISI

Im having difficulty understanding difference between all three Airbus Technical documentation. Pros out here kindly elaborate.

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StereoTechque

Re: Freight Handling on the ATR series vs other turboprop Freighters

It’s a neat little area to “hang out” in lol. Haha..The ATR Aft cargo compartment can also be a good area to hang out depending on the situation.. It is also noteworthy that carrying DGs is prohibited on the Pax ATR Cargo compartment as although physically separated, they fall in same level and onl...

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StereoTechque

Re: Teal Color Inside A320neo Pratt & Whitney Engines

Horstroad wrote:

No It's not

Perfect!
Thanks for the pic.
The black inlet cowl also has visible holes on surface for Accoustic dampening.

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StereoTechque

Re: Teal Color Inside A320neo Pratt & Whitney Engines

airportugal310 wrote:
I believe the official term is "abradable lining/liner" but could be wrong

You are absolutely right. Also called Attrition liner.
Pretty much present on all Turbofans but much more evident on IAE/PWs.

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StereoTechque

Re: Why fuel driven actuators?

Redbellyguppy wrote:
I once flew an aircraft that had pneumatically actuated thrust reversers. There’s an infinite supply of air, too, in an engine that is running.

At the cost of engine efficiency of course.

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StereoTechque

Re: Duration of 747 Hydraulic Pressure Reduction?

The answer to this is it depends upon the specific aircraft model and which surfaces. The 744 flaps, as referenced in the OP would be a great start. Flaps generally are position specific ie. have discrete outputs per the Flap lever Position in the Flight deck. Primary control surfaces like the Aile...

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StereoTechque

Re: Any opinions on hydraulic fuses?

A couple of tragedies occurred when all hydraulic fluid was lost. Japan Air 747 and United DC-10. Do all commercial types use hydraulic fuses or just some? What other systems are there to prevent the complete loss of hydraulic fluid after a catastrophic failure? Every Hydraulic system on an Aircraf...

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StereoTechque

Re: A320 Idle Speed

Does an A320 With V2500 idle at a different speed with just the left engine running (single engine taxi)? Earlier procedure on A320 was to start Engine 2 first as it is directly connected to Yellow EDP which supplies the Parking Brake pressure. Now the procedure has been revised to simplify procedu...

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