Search found 40 matches

by milhaus
Thu Oct 15, 2020 4:08 am
Forum: Civil Aviation
Topic: Delta Narrow Body Thread - 2020
Replies: 553
Views: 63718

Re: Delta Narrow Body Thread - 2020

On Airbus A320 we have weekly check each 8 days, A check at 750 FH, A2 check at 1500FH, these are relatively simply and are done by line maintenance.

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by milhaus
Wed Aug 12, 2020 2:16 pm
Forum: Civil Aviation
Topic: RR finds cracks on IPC blades in Trent XWB engine
Replies: 56
Views: 11156

Re: RR finds cracks on IPT blades in Trent XWB engine

As I amAMT who likes to change engines, it is good thing. Unfortunately I do not have rating for A350...anyway I think that engine which stays on aircraft for 4 to 5 years or 16000 to 22000 flight hours its still amazing piece of technology. And decreased fuel consumption vastly outweights shortened...

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by milhaus
Thu Jul 30, 2020 5:28 am
Forum: Technical/Operations
Topic: Engineer examining engine on landing
Replies: 25
Views: 3856

Re: Engineer examining engine on landing

Greetings from line engineer, most companies in Europe use crew concept now, so all preflights are performed by crew. Usually captains at home base and f/os' outside. Engineers are called for daily or line check. Preflight checks are still done on ETOPS flights.

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by milhaus
Sat Jul 25, 2020 6:27 am
Forum: Technical/Operations
Topic: FAA EAD - CFM-56-7 and -3
Replies: 13
Views: 4269

Re: FAA EAD - CFM-56-7 and -3

I think that AD for other cfm56 versions will follow, those check valves are very similar.

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by milhaus
Tue Jun 02, 2020 10:12 am
Forum: Civil Aviation
Topic: LEAP engines on 737 and A320 fall way short of on-wing targets
Replies: 42
Views: 11353

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

Smartwings already changed two engines within fleet of seven aircraft. They found damage on turbine ceramic lining.

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by milhaus
Tue Jun 02, 2020 9:56 am
Forum: Civil Aviation
Topic: The first Airbus A320 to break the 30-year in service mark
Replies: 203
Views: 76647

Re: The first Airbus A320 to break the 30-year in service mark

No airplanes except chinese are throw away. But I do not know what is exact problem with those MA60 and others, which have short lives with all airlines outside China...

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by milhaus
Thu May 07, 2020 6:39 am
Forum: Military Aviation & Space Flight
Topic: Sweden invites tenders for new phase 1 trainer
Replies: 46
Views: 3252

Re: Sweden invites tenders for new phase 1 trainer

What about Aero L39NG, which will be certified this year?

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by milhaus
Fri Apr 17, 2020 9:19 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, Q2 2020
Replies: 607
Views: 58161

Re: Boeing 737MAX Grounding, General Discussion Thread, April 2020

Morisond, more training is always better, but inabilty to follow checklist is qiute different thing with old technology(MAX) then on A320/330, 777,787 and others new aircraft. In Max there is book with checklists, You have to open it, find correct page, read it, recheck with Your copilot, then perfo...

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by milhaus
Thu Apr 16, 2020 8:14 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, Q2 2020
Replies: 607
Views: 58161

Re: Boeing 737MAX Grounding, General Discussion Thread, April 2020

Morisond, I am sorry that You feel offended. Let me introduce myself little bit, I am B1 engineer with rating for all 737 except jurrasic, 787, A320 all engines, A330 and ATR. So I know systems of the aircraft little bit. AD MAX, I have two problems with current fix, one is that MCAS system redundan...

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by milhaus
Tue Apr 14, 2020 8:31 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, Q2 2020
Replies: 607
Views: 58161

Re: Boeing 737MAX Grounding, General Discussion Thread, April 2020

Morisond wrote MCAS was easily fixed...but everyone now knows that this fix does not work. Boeing has to start again and propose better fix. This fix should include tripple sensor redundancy and way more powerfull computers.

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by milhaus
Thu Feb 27, 2020 9:49 pm
Forum: Technical/Operations
Topic: Silly designs in otherwise great aircraft
Replies: 56
Views: 7826

Re: Silly designs in otherwise great aircraft

A320 NLG air ground sensing proximity sensor targets, they are on small handle which rotates in shaft being actuated by small link, when there is freeplay on shaft and link connection, target will not come fully to proximity sensors and You can not retract landing gear. Every other Aircraft has prox...

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by milhaus
Fri Feb 14, 2020 8:54 am
Forum: Civil Aviation
Topic: CFM Leap engine option for A220
Replies: 20
Views: 4685

Re: CFM Leap engine option for A220

Maybe it is better idea for Airbus to go shopping again and buy Pratt and solve problems with GTF inhouse.

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by milhaus
Mon Feb 10, 2020 11:22 am
Forum: Technical/Operations
Topic: Strange probes on the A350
Replies: 20
Views: 2834

Re: Strange probes on the A350

A320 RAT has operating speed 4750RPM when A/C speed is 92-135KT, when speed is lower antistall systems adjusts output of the hyd pumps in balance to the speed of turbine.

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by milhaus
Mon Feb 10, 2020 7:21 am
Forum: Technical/Operations
Topic: Fuel Burn for A320
Replies: 21
Views: 2427

Re: Fuel Burn for A320

CFM56 powered A320 has fuel.consumption around 2400-2600kg per hour.

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by milhaus
Mon Jan 27, 2020 1:48 pm
Forum: Civil Aviation
Topic: Why didn’t 3 engine planes push out 4 engine planes like 2 engines did?
Replies: 118
Views: 18849

Re: Why didn’t 3 engine planes push out 4 engine planes like 2 engines did?

We should divide topic to two, one for narrowbody and one for widebody. On narrowbody line it was straight, four engined B707, DC8, CV880/990 were substituted by 727 as soon as performance allowed it. Then 727 was replaced by MD80/737/320. One exception is TU154 which replaced twin engine TU104 and ...

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by milhaus
Thu Jan 16, 2020 12:12 pm
Forum: Technical/Operations
Topic: MCDU door slide page EL/ER meaning ?
Replies: 4
Views: 1379

Re: MCDU door slide page EL/ER meaning ?

It is servicing report on A330/340, last page. You should service mentioned door damper.

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by milhaus
Tue Dec 31, 2019 9:30 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 191964

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

I also thing that cost to built is much lower, somewhere betwen 25-35 mil, but its still a lot of money. Also those A/C were built with money from prepayment from airlines received before March. One reasons why Boeing stopped production now that the airlines do not want to make prepayments anymore.

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by milhaus
Mon Dec 30, 2019 7:19 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended
Replies: 5670
Views: 749075

Re: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended

Exemptions are never good and there are too many of them on this airframe. FAA did big mistake to allow them on MAX. Thats why MAX is most unsafe and archaic aircraft built now.

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by milhaus
Sun Dec 22, 2019 8:47 pm
Forum: Civil Aviation
Topic: Should Boeing extend 737 NG production to cover over the MAX?
Replies: 53
Views: 7531

Re: Should Boeing extend 737 NG production to cover over the MAX?

They should make 737MiniMAX , using already built MAX frames and match them with good old CFM56-7 taken from scrapped and stored NGs;-)

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by milhaus
Fri Dec 20, 2019 12:15 pm
Forum: Civil Aviation
Topic: LOT to get more A320s, 20% fleet is not flying
Replies: 48
Views: 14566

Re: LOT to get more A320s, 20% fleet is not flying

It will be nice to see an A340 in LOT colors...

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by milhaus
Thu Dec 19, 2019 11:20 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended
Replies: 5670
Views: 749075

Re: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended

I thing that instalation of aditional AOA is much more easier than redesigning of HST. And bigger HST will need more power to operate, main elec system can be probably boosted but manual system no.

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by milhaus
Wed Dec 18, 2019 6:54 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended
Replies: 5670
Views: 749075

Re: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended

I think that MCAS should have tripple input redundancy, it has to work during all flights.

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by milhaus
Wed Dec 18, 2019 12:27 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended
Replies: 5670
Views: 749075

Re: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended

I thing that playing with statistic is devils game. No other A/c type crashed due to faulty flight control system during last thirty years.

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by milhaus
Tue Dec 10, 2019 11:19 am
Forum: Civil Aviation
Topic: 737NG Pickle fork issue
Replies: 565
Views: 140102

Re: 737NG Pickle fork issue

EL AL 4X-EKM 19 years old, was at VCV between Nov 20th and Dec 2nd for pickle fork repair. So it is aproximatelly ten days job.

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by milhaus
Sun Dec 01, 2019 8:22 am
Forum: Technical/Operations
Topic: DC10 varients
Replies: 32
Views: 2406

Re: DC10 varients

Lufthansa had one A/C Regi D-ADLO with deactivated center NLG. She was used for TLV flights.

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by milhaus
Sat Nov 30, 2019 5:17 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended
Replies: 5670
Views: 749075

Re: Boeing 737MAX Grounded Worldwide Q4 2019

To pixelFlight: no, they are really reliable, it is just selsyn in it, which is already many years proven technology. Many of them are installed on A /C for many many years. Those which have to be removed is 90% heating system failure, then mechanical damage of wing from FOD and lightning...

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by milhaus
Sat Nov 30, 2019 12:01 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended
Replies: 5670
Views: 749075

Re: Boeing 737MAX Grounded Worldwide Q4 2019

On Airbus ADIRU You can see exact values. I can not remember on 737, it is too many years ago. But I thing it is the same. They are really not changed so often.

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by milhaus
Sat Nov 30, 2019 11:15 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended
Replies: 5670
Views: 749075

Re: Boeing 737MAX Grounded Worldwide Q4 2019

To mjoelnir: I have checked PN of AOA that are used on MAX, they are the same like ones on NG. ( I did not have access to JT or ET manuals just another big operator) Also instalation test is not rockett science, You just hold it in zero position marked on sensor flange and check values shown on comp...

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by milhaus
Sat Nov 30, 2019 11:03 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended
Replies: 5670
Views: 749075

Re: Boeing 737MAX Grounded Worldwide Q4 2019

AOA sensors value are also send to DFDR and are monitored and checked by flight safety department together wiht hundred of other parameters on each flight. Aditionally AOA outputs are used by ADC or ADIRU in Airbus to compute speed, so when AOA values between sensors are different You get indicated ...

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by milhaus
Fri Nov 29, 2019 5:27 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended
Replies: 5670
Views: 749075

Re: Boeing 737MAX Grounded Worldwide Q4 2019

To jrmy: 90000FH is nothing in terms of part reliability of aircraft parts, especially AOA sensors, in my 23 years experience as AMT on line mtce environment together with ten years at maintenance control center I can remember of only one AOA failure like this. I still can not get how it can fail on...

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by milhaus
Wed Nov 27, 2019 7:50 pm
Forum: Technical/Operations
Topic: 787 electrical architecture efficiency vs traditional systems
Replies: 29
Views: 2960

Re: 787 electrical architecture efficiency vs traditional systems

Fyi electrical wing antiicing system has three modes of operation: antiice input power 165kW, limited antiice 125kW, deice 45kW.

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by milhaus
Sat Nov 23, 2019 5:48 pm
Forum: Technical/Operations
Topic: What are the aircraft engines average life expectations compared to the aircraft itself ?
Replies: 32
Views: 7161

Re: What are the aircraft engines average life expectations compared to the aircraft itself ?

There is also staggering between bigger and smaller versions, for example between A319 and A321. Engine which lost EGT margin on A321 could still have some on A319 as required power is much lower. An CFM 56-5B on an A319 can have 30000+ flight hours between overhaul but on A321 just 20000.

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by milhaus
Sat Nov 16, 2019 9:10 pm
Forum: Technical/Operations
Topic: 787 electrical architecture efficiency vs traditional systems
Replies: 29
Views: 2960

Re: 787 electrical architecture efficiency vs traditional systems

I have to study APU at friday, it is also different from other APUs as it does not have bleed as expected. Strangest thing is that fuel pump is not powered from gearbox but it is ran by 28V dc el motor and APUC which is APU controler controls fuel supply by controliing motor speed, no fuel metering ...

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by milhaus
Wed Nov 13, 2019 4:07 pm
Forum: Technical/Operations
Topic: 787 electrical architecture efficiency vs traditional systems
Replies: 29
Views: 2960

Re: 787 electrical architecture efficiency vs traditional systems

I forgot, some of tranformers are cooled by liquid and are so heavy that You need some special equipment for removal and instalation. It is hard to imagine that this layout can save some weight.

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by milhaus
Wed Nov 13, 2019 4:04 pm
Forum: Technical/Operations
Topic: 787 electrical architecture efficiency vs traditional systems
Replies: 29
Views: 2960

Re: 787 electrical architecture efficiency vs traditional systems

Hello I have aditional facts about electrical systems. Main network is 235V variable frequency, which is produced by VFSG and apu generators. There also two autotransformers which converts from 235V to 115V variable frequency or only with GPU connected 15V To 235V. There are also four transformer re...

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by milhaus
Tue Nov 12, 2019 4:22 pm
Forum: Technical/Operations
Topic: 787 electrical architecture efficiency vs traditional systems
Replies: 29
Views: 2960

Re: 787 electrical architecture efficiency vs traditional systems

Hello, I am on b878 B1 course right now. Electrical system performance, each of four VFSG normally supplies 250kVA, in overload condition it can supply 312kVA for five minuts or 437,5kVA for five seconds. Each weights 94kg dry and it has oil system with FOHE( fuel oil heat exchanger) and AOHE( air o...

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by milhaus
Mon Oct 28, 2019 5:27 pm
Forum: Civil Aviation
Topic: Updated: Czech Airlines converting from 7 A320neo to 4 A220-300 and 3 A321XLR
Replies: 38
Views: 10467

Re: Updated: Czech Airlines converting from 7 A320neo to 4 A220-300 and 3 A321XLR

CSA wants to lease two A330 next year, one for ICN flight and second for charter flights. But everything depends on Smartwings....btw ICN flight is almost full all the time.

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by milhaus
Wed Oct 23, 2019 12:24 pm
Forum: Civil Aviation
Topic: Updated: Czech Airlines converting from 7 A320neo to 4 A220-300 and 3 A321XLR
Replies: 38
Views: 10467

Re: Updated: Czech Airlines converting from 7 A320neo to 4 A220-300 and 3 A321XLR

ATR aircraft are scheduled to leave CSA fleet in 2021. They operate five of them now, sixth is prepared for redelivery.

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by milhaus
Wed Jun 12, 2019 3:01 pm
Forum: Technical/Operations
Topic: Physial design of control of 737 jackscrew
Replies: 16
Views: 2428

Re: Physial design of control of 737 jackscrew

I am just engineer not pilot . I just wanted to feel power of the system..

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by milhaus
Tue Jun 11, 2019 7:44 pm
Forum: Technical/Operations
Topic: Physial design of control of 737 jackscrew
Replies: 16
Views: 2428

Re: Physial design of control of 737 jackscrew

I tried it some time ago. I had extended trim wheel handle, held it and then momentarily applied trim command. It is possible to hold it but force is very high and I think it is possible to catch it and hold when it turns.

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