Search found 374 matches

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by glen
Thu May 05, 2022 1:58 pm
Forum: Civil Aviation
Topic: Help wanted with mystery biplane.......
Replies: 14
Views: 2567

Re: Help wanted with mystery biplane.......

I think it's a Fisher Celebrity. (https://fisherflying.com) I can see two small differences to most examples found on the internet: The rudder is not balanced by a horn and there is no connection between lower and upper aileron. But as it is a homebuilt plane, individual solutions are not uncommon. ...

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by glen
Sun Jan 09, 2022 5:46 pm
Forum: Technical/Operations
Topic: Fuel Policy and Route to Destination Alternate
Replies: 15
Views: 1828

Re: Fuel Policy and Route to Destination Alternate

The CF in the Swiss OFP means Company Fuel and means fuel prescribed by the company. The reason for the CF is not visible on the OFP but in the planning documentation. In those years there was an issue with the Altnernate Planning in the Software. The CF on this specific example was indeed to cover ...

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by glen
Wed Jan 05, 2022 1:33 pm
Forum: Technical/Operations
Topic: Fuel Policy and Route to Destination Alternate
Replies: 15
Views: 1828

Re: Fuel Policy and Route to Destination Alternate

It seems it is not so easy for the flight planning systems to perform this calculation automatically, as the missed approach procedures usually don't guide you into the airway structure like a SID. Therefore we have an approved method, where the system plans the expeted route between destination and...

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by glen
Tue Dec 21, 2021 8:42 pm
Forum: Technical/Operations
Topic: Airspeed lost
Replies: 11
Views: 1554

Re: Airspeed lost

I am sure, no such test procedure exists. Either you misunderstood some things or someone told you absolute crap. Even with manual thrust and protections off, you will never reach this speed in level flight. As spudsmac says, that would be around M1.0 (depending on temperature). Simply too much drag...

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by glen
Mon Dec 20, 2021 3:52 pm
Forum: Site Related
Topic: old dog, how do I change my Email etc ?
Replies: 1
Views: 1373

Re: old dog, how do I change my Email etc ?

The most important thing is to be on the home page or a picture page. It does not work out of the forum. On the top right you have your profile picture (or three small lines when the browser page is below a certain width). When clicking you can select "Settings" (or "My Account" ...

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by glen
Wed Dec 08, 2021 6:43 pm
Forum: Aviation Photography
Topic: Have quality standards changed on here recently?
Replies: 309
Views: 89846

Re: Have quality standards changed on here recently?

What is so bad about backlit shots? If they are technically good, why not? The two MD11 shots are very good examples. One can argue the backlit shot is even better (I know, I'm opening a can of worms). The colors in the shadow area are very nice while in the sunny side shot the details around the co...

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by glen
Thu Dec 02, 2021 9:17 pm
Forum: Technical/Operations
Topic: Historical question .. tail dragging aircraft
Replies: 3
Views: 1315

Re: Historical question .. tail dragging aircraft

Without much thinking a few points come into my mind: Weight: A nose wheel needs to be much sturdier, especially on grass, soft fields. Thus adding a lot of weight. Complexity: At the beginning they didn't even need brakes. The tail without a wheel created enough drag. With upcoming retractable gear...

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by glen
Tue Nov 23, 2021 6:51 pm
Forum: Technical/Operations
Topic: Can 747s really use flaps even with total hydraulic loss and if so why isnt this on other aircraft?
Replies: 19
Views: 4524

Re: Can 747s really use flaps even with total hydraulic loss and if so why isnt this on other aircraft?

I will speak for the narrow body Airbus, it is "flyable" with a total hydraulic loss, not sure if it's going to be land-able. There is a mechanical backup for the rudder and THS. I heard recently in the school house that mechanical back up of the rudder will be going away at some point so...

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by glen
Sun Nov 14, 2021 9:00 pm
Forum: Technical/Operations
Topic: LAT/LONG - Most accurate unit measuring system in aviation?
Replies: 7
Views: 2173

Re: LAT/LONG - Most accurate unit measuring system in aviation?

That's an easy calculation:
DD MM.M' gives you an accuracy of 1/10 of a Minute, i.e. 1/10 of a nautical mile
DD MM'SS' gives you an accuracy of 1/60 of a Minute, i.e. 1/60 of a nautical mile, so this is more exact.

We usually use DD MM.M'

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by glen
Fri Nov 12, 2021 3:57 pm
Forum: Technical/Operations
Topic: Pilots wearing gloves during flight?
Replies: 10
Views: 3560

Re: Pilots wearing gloves during flight?

Woodreau wrote:
There is nothing about a civilian pilots uniform that is safe in a fire. I.e synthetic materials that have a low melting point


That's not necessarily true for all carriers. The outside of our uniform is quite resistant to fire. We can use the jacket as a fire blanket.

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by glen
Sun Oct 10, 2021 12:30 pm
Forum: Technical/Operations
Topic: Could flap operation be automated?
Replies: 18
Views: 2013

Re: Could flap operation be automated?

For some situations, automatic flaps already exist. On the Airbus (330/340) we have two automatic systems: Flap Load Relief System (FLRS): It is a protection and usually not used intentionally. With configurations 2, 3 or FULL, when exceeding the maximum speed for the actual configuration by 2.5 kts...

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by glen
Fri Oct 08, 2021 6:00 pm
Forum: Technical/Operations
Topic: EGLL SID Altitude Constraints
Replies: 7
Views: 1019

Re: EGLL SID Altitude Constraints

On busy days you usually have to maintain these altitudes. Main reason is separation of outbound and inbound traffic of all the different airports in the London area. Not a very economical, but a very safe way. As soon as traffic permits, they let you continue your climb. I experienced a few departu...

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by glen
Thu Sep 09, 2021 7:55 pm
Forum: Technical/Operations
Topic: PA28, 0.6 gallons remaining (2.5 liters) of usable fuel at landing
Replies: 32
Views: 4205

Re: PA28, 0.6 gallons remaining (2.5 liters) of usable fuel at landing

Switching every 15 minutes is not a great idea, until you are perhaps at the point where you only have an hour of fuel. That's right, switching in short intervalls makes no sense. Some imbalance is no problem. If you get into the situation of needing your reserves by whatever mistakes it's getting ...

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by glen
Mon Apr 12, 2021 9:56 am
Forum: Technical/Operations
Topic: Crippled by a windshield wiper
Replies: 25
Views: 3974

Re: Crippled by a windshield wiper

Whenever you stop the wipers via the wiper switch they continue to move into the park position. When you shut them off by pulling the C/B they will probably stop at whatever intermediate position they are, as you just interrupt the power. Although the speed limit is described as maximum "operat...

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by glen
Tue Mar 23, 2021 10:16 am
Forum: Technical/Operations
Topic: Grass landing strips
Replies: 21
Views: 2868

Re: Grass landing strips

Flying taildragger off grass is a whole different deal than off asphalt—the forgiveness of slipping is great. True. My J-3 was based on grass and all the tail wheel warbirds use the grass at Duxford 95% of the time Thats's the reason I always require a trainee to do quite some landings on concrete ...

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by glen
Sun Mar 21, 2021 7:09 pm
Forum: Civil Aviation
Topic: Swiss Aviation Thread - 2021
Replies: 211
Views: 49843

Re: Swiss Aviation Thread - 2021

swiss now schedules, according to their webpage, Edelweiss A340 from ZRH to LHR during the month of April, cargo related. With the UK quarantine regulation in place, I will miss the opportunity to fly the widebody, what a shame! Would have loved to fly... Lately I had a passenger on board to LHR, w...

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by glen
Thu Dec 03, 2020 8:38 pm
Forum: Civil Aviation
Topic: Livery to honor airlines' employees
Replies: 28
Views: 4154

Re: Livery to honor airlines' employees

swiss had a special livery for their first 777:



Interesting detail: One of the Flight Attendants with a big portrait is the widow of the captain who died at the Swissair 111 crash.

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by glen
Mon Nov 23, 2020 9:41 am
Forum: Technical/Operations
Topic: Why is the Cessna Grand Caravan so slow compared to other turboprops?
Replies: 19
Views: 3495

Re: Why is the Cessna Grand Caravan so slow compared to other turboprops?

Slower speed is due to fixed landing gear. About the altitude: The Caravan is not pressurised, so flying at 25000 would necessitate an oxygen delivery system and the wearing of masks for crew and passenger. The general layout with fixed gear and no pressurisation is due to a complete different typic...

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by glen
Sat Nov 14, 2020 6:09 pm
Forum: Aviation Photography
Topic: Photo from postcard
Replies: 6
Views: 5369

Re: Photo from postcard

thanks for the quick reply.

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by glen
Sat Nov 14, 2020 2:34 pm
Forum: Aviation Photography
Topic: Photo from postcard
Replies: 6
Views: 5369

Photo from postcard

https://www.ricardo.ch/de/a/air-zaire-b ... 137650126/

And when reading the caption it seems obvious, the photographer does not hold the rights of this picture.
-->

While I really like this picture,



I doubt it belongs into this database as it is taken from a postcard: https://www.ricardo.ch/de/a/air-zaire-b ... 137650126/

And when reading the caption it seems obvious, the photographer does not hold the rights of this picture.

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by glen
Thu Jul 09, 2020 8:55 am
Forum: Technical/Operations
Topic: PTU in Airbus?
Replies: 11
Views: 2550

Re: PTU in Airbus?

- A340: I can't find any diagrams or other info, but given it is basically the same aircraft as the A330 I would guess the architecture is similar but with more pumps since it has more engines. Yes, the general layout is basically the same, but with the same amount of pumps. Eng 1 and Eng 4 drive t...

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by glen
Sun Jul 05, 2020 8:14 am
Forum: Technical/Operations
Topic: Swissair Retrenchment
Replies: 4
Views: 1709

Re: Swissair Retrenchment

I believe Swissair actually died completely and that the Swiss we know today is actually the former Crossair picking up Swissair's assets, aircraft, etc... Yes, basically Swiss was built on Crossair with the help of external, namely tax payers, money. For the OP question: All pilots above the age o...

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by glen
Tue Jun 16, 2020 2:49 pm
Forum: Technical/Operations
Topic: TAS question
Replies: 2
Views: 2929

Re: question

TAS does decrease. The speed of sound is only a function of temperature. Speed of sound in m/s is c ≈ 331.5 + (0.6 x ϑ) , with ϑ=Temperature in °C. Therefore speed of sound decreases with decreasing temperature. So with a constant Mach number, but a decreasing speed of sound due to lower temperature...

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by glen
Wed Jun 10, 2020 3:24 pm
Forum: Technical/Operations
Topic: Landing - Thrust Reverse and Brake
Replies: 33
Views: 2785

Re: Landing - Thrust Reverse and Brake

Can the Autobrake setting be changed once the WoW has been triggered? In the recent FedEx overrun in BOM, if the crew didn't expect that much water on the runway/more water accumulation towards the end of the runway, could they have changed the Autobrake setting after touchdown? Even if it would be...

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by glen
Wed May 06, 2020 11:32 am
Forum: Site Related
Topic: Photo related issues
Replies: 25
Views: 25678

Re: Photo related issues

In my experinece the correction function works fine. But you have to be patient, as the database editors are (like all staff) voulunteers and there is no guarantee when one of them is at work. It rarely takes more than a day to have a correction implemented, however there is no guarantee.

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by glen
Fri Apr 17, 2020 8:55 am
Forum: Aviation Photography
Topic: Photo(s) that made you go WOW!
Replies: 348
Views: 190842

Re: Photo(s) that made you go WOW!

I really like this thead, for the sake of photos that make me go WOW.
So could you all please stay on topic and discuss other pictures in another thread. Pls.

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by glen
Thu Apr 09, 2020 2:02 pm
Forum: Technical/Operations
Topic: Does reverse thrust actually decrease stopping distance?
Replies: 16
Views: 4833

Re: Does reverse thrust actually decrease stopping distance?

In addition to what Starlionblue said, on a contaminated runway the autobrake system may not reach the target deceleration. In this case the reverse thrust will decrease the stopping distance.

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by glen
Sat Feb 29, 2020 1:52 pm
Forum: Technical/Operations
Topic: Silly designs in otherwise great aircraft
Replies: 56
Views: 8279

Re: Silly designs in otherwise great aircraft

The reading light on the A330/340 is a joke. It's fine if you lean back, then it illuminates the table. As soon as you lean forward in order to read or especially to write something, your head will overshadow the table. The A320 has a nice light strip underneath the glareshield panel, lighting up th...

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by glen
Mon Dec 09, 2019 9:12 am
Forum: Technical/Operations
Topic: Professional pilots: what else do you fly?
Replies: 13
Views: 3036

Re: Professional pilots: what else do you fly?

The season is just about to start... :D



And the Bucker on my profile picture will be in the air again in spring!

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by glen
Tue Apr 02, 2019 12:16 pm
Forum: Technical/Operations
Topic: Question about "Visual Approaches" on an IFR flight plan
Replies: 11
Views: 1984

Re: Question about "Visual Approaches" on an IFR flight plan

There’s a lot of charted visuals in the US, can’t think of one overseas, though. I doubt I’ve done more than a handful of visuals outside the US and Canada. I’ve asked for them many times, oft times it would have helped ATC and me, but never given. Beautiful clear day in Geneva, inbound, but someho...

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by glen
Mon Mar 18, 2019 9:28 am
Forum: Technical/Operations
Topic: Are there any flights left that don't qualify for ETOPS?
Replies: 6
Views: 2453

Re: Are there any flights left that don't qualify for ETOPS?

There might be different rules in different parts of the world. Under EASA you can definitely plan a route farther away from an airport with a three- or fourengine aircraft than with a twin. There is no specific rule time for EROPS planning (which is planning a route more than 90 minutes away from a...

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by glen
Tue Mar 12, 2019 1:15 am
Forum: Technical/Operations
Topic: A330/350 type rating
Replies: 17
Views: 5003

Re: A3330/350 type rating

workhorse wrote:

I think (but not so sure, hence the question) that Swiss pilots used to fly both the A320 and the A330/A340 family (thus effectively covering the whole fleet of their airline).


It was either A320 and A330 for some pilots or A330 and A340 for the others, but never all three types.

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by glen
Thu Feb 28, 2019 6:36 am
Forum: Non-Aviation
Topic: Parts of Indian and Pakistani airspace closed after multiple shootdowns
Replies: 323
Views: 32578

Re: Tensions in South Asia - Pakistani and North Indian Airspace Shut Down

Just look at the terrain on the eastern part. The elevations there average around 14k ft, hence would be unsuitable in case of emergencies like decompression, engine failure, or emergency landing, as there aren't many airstrips there and the aircraft wouldn't be able to come down to a safe breathab...

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by glen
Sat Jan 12, 2019 3:12 pm
Forum: Technical/Operations
Topic: which engine to cut off before using GPU
Replies: 8
Views: 2893

Re: which engine to cut off before using GPU

It can also depend on the situation. If we taxi-in on one engine with the A330 we shut down ENG2 during taxi in order to have the Green and Blue Hydraulic Systems pressurized by ENG1. So while waiting for GPU at the gate, Engine 1 is running. On the other hand, if we taxi in with both engines we shu...

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by glen
Tue Nov 20, 2018 5:51 pm
Forum: Technical/Operations
Topic: Bae 146 Nickname
Replies: 15
Views: 3009

Re: Bae 146 Nickname

As far as I remember the name was initially not given by the pilots but by Crossair itself as a marketing idea. They also called the Saab 2000 "Concordino", however "Jumbolino" was more succesful. This was the official sticker: https://i.ebayimg.com/images/g/6G8AAOSwZhtbx4A7/s-l1...

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by glen
Wed Oct 24, 2018 4:46 pm
Forum: Technical/Operations
Topic: Airbus 319/320/321 Front Gear
Replies: 9
Views: 2429

Re: Airbus 319/320/321 Front Gear

Borrowed from automotive references: Positive Caster Increasing the amount of positive caster will increase steering effort and straight line tracking, as well as improve high speed stability and cornering effectiveness. Positive caster also increases tire lean when cornering (almost like having mo...

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by glen
Wed Sep 12, 2018 9:50 pm
Forum: Technical/Operations
Topic: A340 Takeoff Performance Calculations
Replies: 17
Views: 3092

Re: A340 Takeoff Performance Calculations

I’ve flown with guys that learned on Aztecs and Barons where getting to “blue line”speed quickly was everything to survival in the case of engine loss. They never got over that even in jets—slow rotations, V2+30 at 50’, etc, rotate to 8-10 degrees when the target in type was 15-17*. GF That, and so...

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by glen
Wed Sep 12, 2018 11:05 am
Forum: Technical/Operations
Topic: A340 Takeoff Performance Calculations
Replies: 17
Views: 3092

Re: A340 Takeoff Performance Calculations

For me it seems the main problem with this take-off is not only the rotation rate but mainly the too low pitch attitude at the end of the rotation. As mentioned by Starlionblue the target pitch is at 12.5°. Considering the fact that tailstrike with compressed main gear is at 10° and looking at the v...

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by glen
Tue Aug 28, 2018 12:23 pm
Forum: Technical/Operations
Topic: Runway Length required for Airbus A330
Replies: 17
Views: 11568

Re: Runway Length required for Airbus A330

Commercial ops require actual landing distances to be within 60% of the actual landing distance available. Factoring gives a pad. Gf Is the factor that small in EASA, Starlionblue? That looks like 15% or less. GF The numbers I posted are straight from the FlySmart Landing app, it is certified data ...

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by glen
Fri Jul 27, 2018 1:26 pm
Forum: Civil Aviation
Topic: A320 Flight by Tianjin Airlines Forced to Land at Wuhan after Hailstorm Smashed Windshield and Damaged Nose
Replies: 11
Views: 2956

Re: A320 Flight by Tianjin Airlines Forced to Land at Wuhan after Hailstorm Smashed Windshield and Damaged Nose

an A320 from Tianjin to Haikou got under attack by a hailstorm when cruising at an altitude of 9,800 a misfortune that led to the plane's frontal outer windshield smashed and its nose damaged You don't get under attack by a hailstorm, you fly into it. Therefore it's not a misfortune but a misjudgem...

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by glen
Sat Jun 02, 2018 2:05 pm
Forum: Technical/Operations
Topic: Ground Speed Question
Replies: 21
Views: 2388

Re: Ground Speed Question

Winds. So the winds are always blowing from west to east? Not generally, but on an average latitude (between 30° and 60°) that's indeed the most common winddirection in the upper atmosphere. This is caused by the rotation of the earth, disturbed only by the position of High and Lowpressure systems ...

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by glen
Sat May 26, 2018 6:49 am
Forum: Civil Aviation
Topic: Edelweiss' pilots have security concerns and cabin crews are not proud of their product
Replies: 18
Views: 6258

Re: Edelweiss' pilots have security concerns and cabin crews are not proud of their product

Not having GPWS in the year 2018 is indeed pretty ridiculous. That needs to change. They are not talking about the GPWS, they talk about the RAAS (Runway Awareness and Advisory System) - a system which informs you when approaching or entering a runway, or if you are trying to take-off on a taxiway.

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by glen
Fri May 04, 2018 6:09 pm
Forum: Technical/Operations
Topic: Calculating v1 and vr speeds.
Replies: 16
Views: 2275

Re: Calculating v1 and vr speeds.

An FMC that computed Vspeeds? Display....yes, but compute with all the variables? I assume you were using the Honeywell Pegasus in the MD11? Yes, that's correct. I was just checking my old books again and that's indeed what it did. With help of the entered weight, slope and atmospheric conditions. ...

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by glen
Fri May 04, 2018 2:00 pm
Forum: Technical/Operations
Topic: Calculating v1 and vr speeds.
Replies: 16
Views: 2275

Re: Calculating v1 and vr speeds.

Clearing out the cobwebs in my brain and not having flown the DC-9/MD-80, I am sure it was very similar to the 727. We had a runway analysis page for each runway at every destination and alternate we flew into. There were various gross weights and temps with adjustments for altimeter settings and e...

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by glen
Fri May 04, 2018 7:14 am
Forum: Technical/Operations
Topic: Is there a minimum "rest" time for an aircraft?
Replies: 55
Views: 7392

Re: Is there a minimum "rest" time for an aircraft?

With very optimized ground processes (e.g. cabin cleaning starting already from the rear entrance while passengers still deboard through the front door into the jetty) we managed to turn an in- and outbound full A320 in about 30 to 35 minutes. But ervery small disturbance in the process will ruin su...

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by glen
Fri May 04, 2018 7:05 am
Forum: Technical/Operations
Topic: Calculating v1 and vr speeds.
Replies: 16
Views: 2275

Re: Calculating v1 and vr speeds.

As mentioned above v-speeds today are optimized not only for weight but also for runway length, contamination, wind, temperature, pressure and obstacle situation. Older generation jets (I think about DC-9/MD-80 series, Fokker F100 a.s.o) and a lot of todays turboprops have speed booklets or speed ta...

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by glen
Sun Apr 01, 2018 9:29 am
Forum: Civil Aviation
Topic: SWISS (LX) 777-300ER Flights GVA-ZRH-GVA
Replies: 7
Views: 2249

Re: SWISS (LX) 777-300ER Flights GVA-ZRH-GVA

Is the JFK-GVA flight crewed by GVA based pilots and FAs or those from ZRH? There are no GVA based pilots and GVA-based FA's are only qualified on shorhaul aircraft (Bombardier, A320-family) and the A330/340 for the GVA-JFK flight. One reason can be shortage of shorthaul aircraft. But often shortha...

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by glen
Sun Apr 01, 2018 9:20 am
Forum: Civil Aviation
Topic: Swiss aviation thread - 2018
Replies: 399
Views: 62580

Re: Swiss aviation thread - 2018

Possibly a medical emergency, I guess? In case of a medical emergency, time is a crucial factor and thus one would usually perform an overweight landing instead of burning fuel for hours. Strange that the A330 can’t dump fuel since the A340 can? Can it be related to the fact the A330 was originally...

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by glen
Mon Mar 26, 2018 9:47 am
Forum: Technical/Operations
Topic: Great Circle Flight Plan Question
Replies: 23
Views: 2699

Re: Great Circle Flight Plan Question

If you have a tailwind the air distance will be shorter. I don't understand. Isn't the great circle distance the shortest possible connection (in terms of length, not time) of two points on a globe? I understand that another, longer route can be faster but not shorter. Think about the air distance ...

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by glen
Sun Mar 25, 2018 10:27 pm
Forum: Technical/Operations
Topic: Hand Propping a Dash 8
Replies: 21
Views: 4183

Re: Hand Propping a Dash 8

You can't do that with a piston engine, because of the risk of the engine starting, and the amount of compression on each cylinder. Well, you can. It's not the norm, but depending on the engine you even have to. I had the chance to fly a Pilatus P-2 for a few years. The problem with its Argus-engin...

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