Search found 228 matches

by StereoTechque
Mon May 30, 2022 3:30 am
Forum: Technical/Operations
Topic: Portable External Oil Cooler
Replies: 11
Views: 2146

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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by StereoTechque
Fri May 27, 2022 4:06 pm
Forum: Technical/Operations
Topic: Is an Aircraft Perfectly Balanced 50/50?
Replies: 17
Views: 2012

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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by StereoTechque
Sun May 08, 2022 9:39 am
Forum: Technical/Operations
Topic: CFM Engine High Oil Consumption
Replies: 28
Views: 3551

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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by StereoTechque
Thu May 05, 2022 2:49 pm
Forum: Technical/Operations
Topic: CFM Engine High Oil Consumption
Replies: 28
Views: 3551

Re: CFM Engine High Oil Consumption

viewtopic.php?p=23286961
.


I tried continuing in the same thread, but then admin locked it.
-->

LH707330 wrote:
.

Regarding the CFM56-5C, there was a thread a while back where it got brought up: viewtopic.php?p=23286961
.


I tried continuing in the same thread, but then admin locked it.

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by StereoTechque
Thu May 05, 2022 5:39 am
Forum: Technical/Operations
Topic: CFM Engine High Oil Consumption
Replies: 28
Views: 3551

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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by StereoTechque
Wed May 04, 2022 5:03 am
Forum: Technical/Operations
Topic: CFM Engine High Oil Consumption
Replies: 28
Views: 3551

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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by StereoTechque
Tue May 03, 2022 6:07 pm
Forum: Technical/Operations
Topic: CFM Engine High Oil Consumption
Replies: 28
Views: 3551

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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by StereoTechque
Wed Apr 13, 2022 7:28 pm
Forum: Civil Aviation
Topic: Aircraft Certification Problems
Replies: 25
Views: 3345

Re: Aircraft Certification Problems

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

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by StereoTechque
Sun Apr 10, 2022 9:02 am
Forum: Technical/Operations
Topic: Location of data plate on Airbus aircraft
Replies: 17
Views: 2531

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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by StereoTechque
Sun Apr 10, 2022 8:59 am
Forum: Technical/Operations
Topic: A320Neo new landing light location
Replies: 6
Views: 2922

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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by StereoTechque
Sat Apr 09, 2022 7:15 pm
Forum: Technical/Operations
Topic: A320Neo new landing light location
Replies: 6
Views: 2922

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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by StereoTechque
Fri Feb 18, 2022 3:12 pm
Forum: Technical/Operations
Topic: Pre-Departure Walkaround Top of Fuselage
Replies: 20
Views: 4202

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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by StereoTechque
Thu Feb 17, 2022 10:09 am
Forum: Technical/Operations
Topic: Pneumatic vs Hydraulic
Replies: 35
Views: 3814

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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by StereoTechque
Thu Feb 17, 2022 3:04 am
Forum: Technical/Operations
Topic: The sound of a big turboprop
Replies: 7
Views: 1746

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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by StereoTechque
Wed Feb 16, 2022 5:09 pm
Forum: Technical/Operations
Topic: Tire Pressure on A32X Family
Replies: 9
Views: 2626

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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by StereoTechque
Wed Feb 09, 2022 1:58 pm
Forum: Technical/Operations
Topic: Tire Pressure on A32X Family
Replies: 9
Views: 2626

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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by StereoTechque
Wed Feb 09, 2022 6:16 am
Forum: Technical/Operations
Topic: Tire Pressure on A32X Family
Replies: 9
Views: 2626

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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by StereoTechque
Fri Feb 04, 2022 12:20 pm
Forum: Technical/Operations
Topic: Peeling paint on composite surfaces.
Replies: 9
Views: 2967

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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by StereoTechque
Thu Feb 03, 2022 4:41 pm
Forum: Technical/Operations
Topic: Tire Pressure on A32X Family
Replies: 9
Views: 2626

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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by StereoTechque
Thu Jan 13, 2022 5:41 am
Forum: Technical/Operations
Topic: Airbus WISE vs TFU vs ISI
Replies: 2
Views: 1442

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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by StereoTechque
Thu Jan 13, 2022 5:35 am
Forum: Technical/Operations
Topic: A321LR flight level?
Replies: 9
Views: 2369

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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by StereoTechque
Thu Jan 06, 2022 2:39 pm
Forum: Technical/Operations
Topic: Airbus WISE vs TFU vs ISI
Replies: 2
Views: 1442

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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by StereoTechque
Wed Dec 08, 2021 6:28 am
Forum: Technical/Operations
Topic: Freight Handling on the ATR series vs other turboprop Freighters
Replies: 4
Views: 1749

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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by StereoTechque
Sat Dec 04, 2021 9:29 am
Forum: Technical/Operations
Topic: Teal Color Inside A320neo Pratt & Whitney Engines
Replies: 27
Views: 6057

Re: Teal Color Inside A320neo Pratt & Whitney Engines

Horstroad wrote:

No It's not :P

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

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by StereoTechque
Fri Dec 03, 2021 4:20 am
Forum: Technical/Operations
Topic: Teal Color Inside A320neo Pratt & Whitney Engines
Replies: 27
Views: 6057

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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by StereoTechque
Sun Nov 14, 2021 1:58 am
Forum: Technical/Operations
Topic: Why fuel driven actuators?
Replies: 14
Views: 2021

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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by StereoTechque
Wed Oct 27, 2021 6:18 pm
Forum: Technical/Operations
Topic: Duration of 747 Hydraulic Pressure Reduction?
Replies: 7
Views: 927

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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by StereoTechque
Tue Oct 19, 2021 1:41 am
Forum: Technical/Operations
Topic: Any opinions on hydraulic fuses?
Replies: 4
Views: 949

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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by StereoTechque
Thu Sep 30, 2021 7:00 am
Forum: Technical/Operations
Topic: A320 Idle Speed
Replies: 11
Views: 1629

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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by StereoTechque
Sun Aug 22, 2021 5:04 pm
Forum: Technical/Operations
Topic: Does the DC-10 nose gear strut not meet the ground at a 90 degree angle?
Replies: 13
Views: 2484

Re: Does the DC-10 nose gear strut not meet the ground at a 90 degree angle?

Stranger still was the Lockheed Constellation, which as well as having a forward angled nose gear, had considerable 'camber' on the nose wheel axles - meaning that the wheels were angled so that the bottoms of the tires where closer together than the tops. Perhaps this was to counteract to some ext...

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by StereoTechque
Sun Aug 22, 2021 1:18 pm
Forum: Technical/Operations
Topic: Does the DC-10 nose gear strut not meet the ground at a 90 degree angle?
Replies: 13
Views: 2484

Re: Does the DC-10 nose gear strut not meet the ground at a 90 degree angle?

Problem with the canted nose gear design is it completely lifts the outboard nose wheel off the ground in a tight turn while taxiing, now you’re steering with just one wheel, not so good, especially when you have a wet surface Correct. Tight turns mostly are done at lower speeds. A320 Family can al...

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by StereoTechque
Sun Aug 22, 2021 9:55 am
Forum: Technical/Operations
Topic: Are the engines used in repurposed jetliners damaged by the smoke particulates they ingest?
Replies: 3
Views: 1134

Re: Are the engines used in repurposed jetliners damaged by the smoke particulates they ingest?

Adding to above replies Volcanic ash is also very abrasive which resulted in a flame out of engine long back. Forest smoke may be chemically toxic in the long run but a few seconds of ingestion is pretty okay for the engine. The Aircrafts may be shutting off the bleed when they fly over a smoke clou...

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by StereoTechque
Sun Jul 18, 2021 10:18 am
Forum: Technical/Operations
Topic: Protective corrosion coatings and aerodynamics
Replies: 7
Views: 1116

Re: Protective corrosion coatings and aerodynamics

gregorygoodwin wrote:
.
Gregory


That was a fantastic read. Thank you for your inputs.

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by StereoTechque
Tue Jun 22, 2021 6:23 am
Forum: Technical/Operations
Topic: APU Usage
Replies: 18
Views: 3824

Re: APU Usage

Can I ask a dumb question? I've never seen an air conditioning hose that didn't have a fold or kink in it. Are they not actually *designed* to be that way? Actually they do. You just cant notice it when it is supplying High Volume Air as it becomes inflated. However old hoses do leak from areas whe...

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by StereoTechque
Wed May 19, 2021 7:23 pm
Forum: Technical/Operations
Topic: APU Inflight start on Battery
Replies: 8
Views: 2773

Re: APU Inflight start on Battery

Florianopolis wrote:
Could it be because the battery has less juice at lower temperatures?


Normally batteries are located in the Avionics bay which is temperature and pressure controlled. It is not exposed to ambient air. However they are ventilated to ambient by a small vent hole.

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by StereoTechque
Tue May 18, 2021 9:02 am
Forum: Technical/Operations
Topic: APU Inflight start on Battery
Replies: 8
Views: 2773

Re: APU Inflight start on Battery

Thank you all. Doubt cleared.

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by StereoTechque
Tue May 18, 2021 2:07 am
Forum: Technical/Operations
Topic: APU Inflight start on Battery
Replies: 8
Views: 2773

Re: APU Inflight start on Battery

Alright..So in that case the self sustaining speed of APU will increase as we go higher.

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by StereoTechque
Mon May 17, 2021 5:39 pm
Forum: Technical/Operations
Topic: APU Inflight start on Battery
Replies: 8
Views: 2773

APU Inflight start on Battery

APU installed on the A320 has a FL restriction of FL250 when only starting with batteries. However normally if TRU assisted then it can be started upto service ceiling.

What is the reason behind this?

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by StereoTechque
Sun Apr 04, 2021 5:40 am
Forum: Technical/Operations
Topic: That PW1000 howl
Replies: 11
Views: 4169

Re: That PW1000 howl

r6russian wrote:
oldannyboy wrote:
Oh and the whine of a spooling up RB211 naturally!!! .

everybody knows that theres no better sound in aviation than the RB211 spooling up


RB211 spool up is music for the Aviator Soul.
Even the IAEs on the A320 have a little of a sweet note.It was more evident on the older A1s.

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by StereoTechque
Fri Mar 26, 2021 7:15 am
Forum: Technical/Operations
Topic: Different manufacturers for jet engines #1 vs. #2
Replies: 25
Views: 5057

Re: Different manufacturers for jet engines #1 vs. #2

Engine manufacturers sometimes test their engines by replacing one of the regular engines on a quad. That's strictly for test purposes only, though. 0744433 Nice center gear, there... Hehe, Very observant! Looks like Airbus permanently deactivated Centre gear on this one as this bird might never lo...

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by StereoTechque
Mon Mar 08, 2021 10:40 am
Forum: Technical/Operations
Topic: Airbus Wing Hook Symbol
Replies: 2
Views: 1387

Re: Airbus Wing Hook Symbol

https://imgur.com/Y0Spn08

Hoist point attachment.
-->

2395511047 wrote:
Does anyone know the meaning of this "hook" "2" symbol found on an A320 (and other airbus models) wing and sometimes vertical stabilizer?

Thanks!

https://imgur.com/Y0Spn08

Hoist point attachment.

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by StereoTechque
Sat Feb 20, 2021 3:13 am
Forum: Technical/Operations
Topic: Is it true that when flying air pressure won't allow the cabin door to open?
Replies: 22
Views: 3456

Re: Is it true that when flying air pressure won't allow the cabin door to open?

Some cargo doors are outward opening plug type. The aft small cargo door (70") on the B777 for example is an outward opening plug type door (and I'm pretty sure it's the same on the B767). The forward large cargo door (106") and aft large cargo door (106", if installed) are non-plug ...

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by StereoTechque
Thu Jul 16, 2020 5:57 am
Forum: Technical/Operations
Topic: A320 Family Center Fuel Tank system changes?
Replies: 5
Views: 1882

Re: A320 Family Center Fuel Tank system changes?

What about the outer wing tanks? Do the post-2014 A319/A320 and A319neo/A320neo aircraft also have a single wing tank like the A321s? Single wing tank like the 321 would have been great. The 321 wing has a slightly thicker skin crossection and construction hence it could get away with No Outer Tank...

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by StereoTechque
Thu Jun 11, 2020 4:49 pm
Forum: Technical/Operations
Topic: Electric taxiing tug?
Replies: 11
Views: 3290

Re: Electric taxiing tug?

I would think that, while your idea might sound interesting, there are likely the following drawbacks: - Aircraft compatibility. Traditional tug need to connect to different aircraft by the means of different bars. Some exotic aircraft even need to carry their own tow bar in order to get pushed. - ...

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by StereoTechque
Thu Jun 04, 2020 6:50 am
Forum: Technical/Operations
Topic: Landing wind direction
Replies: 28
Views: 3123

Re: Landing wind direction

FriscoHeavy wrote:


Most large/heavy jets do NOT have tires rated to 230 knots or higher.


A320 tires for eg. are rated for max speed of 195 knots. (Im referring Michelin & Goodrich)

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by StereoTechque
Thu Jun 04, 2020 6:45 am
Forum: Civil Aviation
Topic: LEAP engines on 737 and A320 fall way short of on-wing targets
Replies: 42
Views: 11959

Re: LEAP engines on 737 and A320 fall way short of on-wing targets

Sokes wrote:
I don't know if 6000 hours is o.k., bad or very bad. Anybody has some comparisons, e.g. to Trents or GE90?
What about IAE V2500?


For IAE it is 8000 to 12000 hours when on the A320 depending on the borescope findings and thrust rating. When on the A321 it is less than 8000.

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by StereoTechque
Wed May 27, 2020 2:17 am
Forum: Technical/Operations
Topic: Advantages of a pullback vs a pushback?
Replies: 17
Views: 2621

Re: Advantages of a pullback vs a pushback?

I remember when AA used TRs for “pullback” on the MD80s at DFW. The sequence would start with a momentary forward motion, then you’d hear the TRs engage before starting your pullback. Except for the slight forward motion, it was pretty cool. It was called Powerback. Saved a few minutes of time but ...

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by StereoTechque
Wed May 27, 2020 2:14 am
Forum: Technical/Operations
Topic: No bare aluminum on retro livery aircraft
Replies: 10
Views: 2613

Re: No bare aluminum on retro livery aircraft

Bare Aluminium is challenging to maintain. It is best if the metal has a primer and a coat of paint over it for protection and cosmetic purposes.

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by StereoTechque
Fri May 22, 2020 3:15 am
Forum: Technical/Operations
Topic: Advantages of a pullback vs a pushback?
Replies: 17
Views: 2621

Re: Advantages of a pullback vs a pushback?

kabq737 wrote:
That’s interesting thanks for the answers everyone.

Can all aircraft have a tow bar connected from the rear?

Nope not all aircrafts have that luxury.
There is a provision on the A320 MLG so that it can be pulled back in case of NLG overrun.

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by StereoTechque
Mon May 18, 2020 7:02 am
Forum: Technical/Operations
Topic: RR CTi Fan Colour
Replies: 5
Views: 1353

Re: RR CTi Fan Colour

The turquoise color is inherent in the CTi formulation so... yes, these will be in the production engines and no, multiple colors would not be an option, nor is this for marketing purposes. You can see a similar color on the inner liner of the PW1100g engine. This is functional and a result of the ...

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