Search found 3668 matches

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by Tristarsteve
Sat Oct 17, 2020 3:44 pm
Forum: Technical/Operations
Topic: B747 Leading Edge Slats
Replies: 9
Views: 1467

Re: B747 Leading Edge Slats

BA had a close accident on a B744 taking off from Johannesburg.
The sensor that tells the LE flaps to retract actuated during a take off run, causing the slats to retract just before rotation.
The aircraft managed to get airborne, but it was close. The logic was changed after that.

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by Tristarsteve
Fri Oct 16, 2020 4:20 pm
Forum: Technical/Operations
Topic: When does it become safe to approach an engine after shutoff?
Replies: 15
Views: 1493

Re: When does it become safe to approach an engine after shutoff?

But doesn't the flight deck crew wait for the engine to spin down before turning off the beacons? The last two airlines I worked with did. In a strong wind the fan wasn't slowing down much and they were waiting to turn off the beacons, and we were waiting for them!! Here is part of the shutdown chec...

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by Tristarsteve
Sun Oct 04, 2020 3:45 pm
Forum: Technical/Operations
Topic: In your airline, do you start the APU upon landing?
Replies: 23
Views: 2963

Re: In your airline, do you start the APU upon landing?

Here at ARN the rule is that the ground crew do not cross the red line to approach the aircraft until the engines and beacon are off. So you need to start the APU after landing, or you will have no power at the gate. If the APU is inop, then the pilot tells the handling agent and ground power is con...

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by Tristarsteve
Fri Sep 18, 2020 6:31 pm
Forum: Technical/Operations
Topic: Off position for landing gear handle
Replies: 24
Views: 3898

Re: Off position for landing gear handle

Redbellyguppy wrote:
Very much NOT resting on the gear doors but rather, on the up locks themselves.

On the Tristar main gear the uplocks held the doors up, and the gear rested on the doors.

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by Tristarsteve
Sun Sep 13, 2020 4:52 pm
Forum: Technical/Operations
Topic: Do the aircraft of same type(and version) produced many years apart have completely same everything?
Replies: 9
Views: 1416

Re: Do the aircraft of same type(and version) produced many years apart have completely same everything?

But some things change very slowly. The original A320 ordered by BCAL and delivered to BA in 1988 were fitted with fwd door airstairs. I believe only these 10 airline A320 had airstairs fitted To accomodate them a door was fitted underneath the L1 pax door. This door was on all A320 in the form of a...

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by Tristarsteve
Sat Sep 12, 2020 4:35 pm
Forum: Technical/Operations
Topic: Where is the APU of the 727 located? Does it use the same exhaust opening as the middle engine(#2)?
Replies: 17
Views: 2384

Re: Where is the APU of the 727 located? Does it use the same exhaust opening as the middle engine(#2)?

That casimage of the Trident 3B shows the APU installation above the S duct in front of the fin.. All the BEA Trident 1 and 2 had the APU at the base of the fin by 1970 when I started working on them. The RB162 was an odd engine. The compressor blades were glass fibre, and the oil system was total l...

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by Tristarsteve
Fri Sep 04, 2020 5:01 pm
Forum: Technical/Operations
Topic: Over wing fueling the 747
Replies: 23
Views: 2638

Re: Over wing fueling the 747

I was at an airshow once and a B-52 that had done a flyby had a fuel system issue, so they couldn't go back to wherever and had to land. Turned out they couldn't do automated refueling because the fuel system computer was konked out. So they had to overwing it. It took 16 hours... Not only slower b...

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by Tristarsteve
Tue Sep 01, 2020 5:25 pm
Forum: Technical/Operations
Topic: Over wing fueling the 747
Replies: 23
Views: 2638

Re: Over wing fueling the 747

I worked on large jets all my life and have never ever done overwing refuelling. Usually the overwing access port was nowhere near the wingtip so would be no good for this. There was usually a way to fuel more after the refuel system had cut out. An US carrier did this regularly at ARN on its B757, ...

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by Tristarsteve
Wed Aug 05, 2020 7:25 pm
Forum: Civil Aviation
Topic: Boarding from the Starboard Side
Replies: 26
Views: 4964

Re: Boarding from the Starboard Side

The L-1011-1/-100/-200/-250 (the long body version) had this. The L-1011-500 had a main deck galley and no elevator, if I remember right. And British Airways to be different removed the lower galley from their -200 Tristars and moved them upstairs. They also moved the CB panels into the roof by L2/...

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by Tristarsteve
Fri Jul 24, 2020 6:39 pm
Forum: Technical/Operations
Topic: Emergency oxygen cylinders European airlines
Replies: 14
Views: 2714

Re: Emergency oxygen cylinders European airlines

The British Airways B777 and B744 both have gaseous oxygen bottles in the fwd freight hold sidewalls and ceiling for passenger use. Lots of them. At LHR and LGW we fill up these bottles, and the flight deck bottles, from oxygen carts that are towed around the ramp. Filling these bottles on the ramp ...

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by Tristarsteve
Tue Jul 21, 2020 6:50 pm
Forum: Technical/Operations
Topic: Emergency oxygen cylinders European airlines
Replies: 14
Views: 2714

Re: Emergency oxygen cylinders European airlines

You can ship oxygen bottles as cargo. The problem arises in that the shipper has to complete a dangerous goods declaration personally. To do this I must go on a course and pass exams and keep current and I ship one bottle a year. It is cheaper to throw the bottle away!!! I cannot give the bottle to ...

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by Tristarsteve
Thu Jul 09, 2020 6:57 pm
Forum: Technical/Operations
Topic: PTU in Airbus?
Replies: 11
Views: 1570

Re: PTU in Airbus?

By definition actuators use hydraulic pressure to apply a force, not create hydraulic pressure. But since I'm not familiar with the A380 system, maybe Airbus has some funky naming going on here. The A350 and A380 have EHA (electro hydrostatic actuators )fitted to all flying controls as the back up ...

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by Tristarsteve
Wed Jul 08, 2020 9:55 am
Forum: Technical/Operations
Topic: Emergency oxygen cylinders European airlines
Replies: 14
Views: 2714

Re: Emergency oxygen cylinders European airlines

Every flight attendant needs a serviceable emergency oxygen bottle on departure. But it is very common that passengers need oxygen in flight. So on our A320 we carry 5 bottles for the cabin crew , plus 3 similar bottles as spare, plus a separate large portable bottle to supply passenger needs. When ...

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by Tristarsteve
Sat Jun 27, 2020 6:37 pm
Forum: Technical/Operations
Topic: No Reverse Thrust Landings
Replies: 5
Views: 2663

Re: No Reverse Thrust Landings

Reverse thrust is usually more expensive than brakes. So most airlines policy is to select reverse idle, and use the brakes.

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by Tristarsteve
Fri Jun 12, 2020 8:48 am
Forum: Civil Aviation
Topic: Delta Narrow Body Thread - 2020
Replies: 550
Views: 62434

Re: Why have DL's A320-200s not been retired?

Because they didn't order any MAX. In the future, B737-700, B737-800 and B737-900ER would be replaced by A320neo + A321neo instead. Not a chance that A32X of any kind will be replacing their 739ERs. You obviously know more than me about Delta's planning department, but that is a very bold statement...

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by Tristarsteve
Thu Jun 11, 2020 5:44 pm
Forum: Civil Aviation
Topic: Delta Narrow Body Thread - 2020
Replies: 550
Views: 62434

Re: Why have DL's A320-200s not been retired?

Where does the phrase green time or green life come from?
Never heard it before. Is it a Delta word?

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by Tristarsteve
Tue Jun 09, 2020 6:09 pm
Forum: Civil Aviation
Topic: BA could make up to 12,000 employees redundant
Replies: 347
Views: 69173

Re: BA could make up to 12,000 employees redundant

Very sad to hear of the trials of current BA staff. I worked for BA in Europe for 29 years, and was made redundant 3 years ago, along with nearly all the locally employed engineers. Luckily I was about a year from retirement, so I retired earlier than expected. But even then the shock and uncertaint...

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by Tristarsteve
Sun May 24, 2020 1:22 pm
Forum: Technical/Operations
Topic: Why is there residual oil in a preserved or new engine?
Replies: 3
Views: 1486

Re: Why is there residual oil in a preserved or new engine?

The fuel system is filled with a thin preserving oil when the engine leaves the factory. After installation, you drain this oil out via the fuel filter drain, but there is always some left. On the initial engine start this oil has to leave the engine via the burners before the fuel can get there and...

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by Tristarsteve
Tue May 19, 2020 6:03 pm
Forum: Technical/Operations
Topic: Ground height of today’s wide-bodies
Replies: 22
Views: 3658

Re: Ground height of today’s wide-bodies

I’ve noticed the 777 has various nose gear heights - the 773ER is sometimes very high and sometimes short, the 772 and OG 773 are always short. Anyone know the reason for this? This happens to all aircraft, and depends on the load on the nose gear. If the plane is tail heavy, the leg will be longer...

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by Tristarsteve
Mon May 11, 2020 4:52 pm
Forum: Technical/Operations
Topic: 747-400 with non-FADEC engines?
Replies: 13
Views: 1897

Re: 747-400 with non-FADEC engines?

The RB211-524G on the BA B747-400 is not a FADEC engine. It has an EEC (called the FAFC Full Authority Fuel Control) for the fuel system, but the airflow control is all analogue. The VIGVs, and the surge bleed control valves for the IP compressor are controlled entirely by a Fluidic computor, full o...

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by Tristarsteve
Mon May 04, 2020 6:45 pm
Forum: Technical/Operations
Topic: Cabin Door Locks
Replies: 7
Views: 1396

Re: Cabin Door Locks

All airliner cabin doors that I have met in my life are plug type doors. Even the B737 and A320, which both open outwards, but when closed are plug type doors. With any pressurisation, they cannot be opened. The B777 and B787 have a door lock . This engages at about 70 kts to avoid the door opening ...

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by Tristarsteve
Thu Apr 30, 2020 3:09 pm
Forum: Technical/Operations
Topic: Why would B738 be limited to FL250?
Replies: 15
Views: 4274

Re: Why would B738 be limited to FL250?

The pack inop MEL on the A320 has changed over the years. Old aircraft were FL250, and the latest have no limitation. In between it was FL310.
Don't know if it can be changed, but you must check the MSN against the MEL.

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by Tristarsteve
Fri Apr 24, 2020 8:11 am
Forum: Technical/Operations
Topic: Interesting 787 flaperon movements on takeoff
Replies: 8
Views: 1752

Re: Interesting 787 flaperon movements on takeoff

On B777 , on the ground, with an engine at high power, the flaperon is deenergised so it can float in the engine exhaust. When the airspeed rises to 100kts, the flaperon is energised again so it goes back to normal operation. To avoid stress on the mountings at high engine thrust.

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by Tristarsteve
Sun Apr 12, 2020 6:49 pm
Forum: Technical/Operations
Topic: Engine Care During Storage
Replies: 7
Views: 2048

Re: Engine Care During Storage

Turbine engines are stored with oil in the gearbox, and an inhibiting fluid in the fuel system. This inhibiting fluid is like a very thin oil. I personally have never stored an aircraft long enough to warrant using inhibiting oil in the engine. I don't know how long that is. It is a very good idea (...

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by Tristarsteve
Fri Apr 10, 2020 4:37 pm
Forum: Technical/Operations
Topic: 747SP fifth pod ?
Replies: 32
Views: 3304

Re: 747SP fifth pod ?

When the B747-400 took over from the -200, the increased performance meant that only two airlines really used the 5th pod. Qantas and South African, both surrounded by a lot of water. In BA we could 3 engine ferry the aircraft back to London from most stations, and it was much cheaper to ferry the a...

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by Tristarsteve
Wed Apr 01, 2020 11:10 am
Forum: Technical/Operations
Topic: Service Ceiling Difference between A350-900 and -1000 (and 787-8/9 and -10)
Replies: 32
Views: 5480

Re: Service Ceiling Difference between A350-900 and -1000 (and 787-8/9 and -10)

Two points. First I thought that the 43100ft ceiling was to do with flight deck oxygen masks. To fly higher you need a different type which is not worth fitting?? Second from my youth, The HS Trident 2 did not have a passenger oxygen system. It could descend fast with thrust reverse deployed and get...

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by Tristarsteve
Fri Mar 06, 2020 12:57 pm
Forum: Technical/Operations
Topic: No more fuel saving measures during taxi?
Replies: 24
Views: 3421

Re: No more fuel saving measures during taxi?

LabQuest wrote:
This reminded me of something I don't think I've ever seen a 747 taxi out on 2 engines. Is there a reason for this on that specific plane?

Do any 3-4 engine planes taxi with engines off?

The Tristar regularly taxied on 1 and 3. Nbr 2 started near the runway.
There was no rotor bow then either!

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by Tristarsteve
Fri Feb 28, 2020 10:32 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, February 2020
Replies: 708
Views: 96145

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

I don't want to go off topic, but I didn't want to start a new thread either. Is this Fuel Tank FOD issue a Boeing wide concern (787, 777, 767) or just in the Max? If just the Max why? If I'm out of line, and this is common across Boeing in 2020 feel free to delete this post.. I have my theory's , ...

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by Tristarsteve
Thu Feb 27, 2020 10:56 am
Forum: Civil Aviation
Topic: DY Financial Discussion - 2020
Replies: 603
Views: 150177

Re: DY about to go bust?

DY shares are down 27% the last two days on the Oslo Stock Exchange because of urgent worries about the airline's dire liquidity situation, exacerbated by Corona virus fears and Boeing compensation uncertainty. The airline has already been through two emergency offerings the last year. Talks in Nor...

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by Tristarsteve
Fri Feb 21, 2020 11:06 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, February 2020
Replies: 708
Views: 96145

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

Can anyone explain why both Boeing and Airbus have used such old processors in their new aircraft? I didn't even know the 286 processor was still being produced. Do newer more powerful processors have cooling issues or something? If you changed the chip in any flight related computor, then you woul...

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by Tristarsteve
Fri Feb 21, 2020 10:49 am
Forum: Technical/Operations
Topic: (Hypothetical) Water injection on high-bypass engine
Replies: 34
Views: 4492

Re: (Hypothetical) Water injection on high-bypass engine

When I worked for Gulf Air in Bahrain we had water injection on our fleet of 4 BAC111-400. It was widely used in the summer. But even with water, the aircraft was limited by the OAT. I remember one hot day (around 39degC) when all 4 BAC111 were waiting for the temp to drop so they could depart from ...

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by Tristarsteve
Mon Feb 17, 2020 11:03 am
Forum: Civil Aviation
Topic: Admire the skill. EY A380 strong crosswind landing at LHR
Replies: 91
Views: 19523

Re: Admire the skill. EY A380 strong crosswind landing at LHR

skipness1E wrote:
Am I the only one noting that the guy filming was trespassing where he really shouldn't have been?


With a barbed wire fence between him and the aircraft?

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by Tristarsteve
Fri Feb 14, 2020 6:56 pm
Forum: Technical/Operations
Topic: L1011-250 Payload Range
Replies: 15
Views: 3699

Re: L1011-250 Payload Range

There was no -2. The original was the -1, then came the -100, with increased weights which also had RB211-22B but had a centre tank. Soon after came the -200 which was similar to a -100 with -524 engines. I worked for Gulf Air, and we bought new -100 aircraft, and later new -200 aircraft. The -100 w...

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by Tristarsteve
Wed Feb 05, 2020 10:54 am
Forum: Technical/Operations
Topic: Mechanics of the Parking Brake
Replies: 16
Views: 1908

Re: Mechanics of the Parking Brake

Not all airlines release the brakes at at the gate. At British Airways, the crew set the brakes on arrival, and leave them on. They release them on departure when the ground crew tells them to do so for pushback. It was decided that this was the safest option. There were enough incidents of aircraft...

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by Tristarsteve
Tue Feb 04, 2020 10:14 am
Forum: Technical/Operations
Topic: Mechanics of the Parking Brake
Replies: 16
Views: 1908

Re: Mechanics of the Parking Brake

Until recently there were two types of park brake. First B737 and A320 are different. B737 has a single set of brake pistons, with a shuttle valve to primary or standby supply. A320 has two sets of brake pistons, One primary, and one standby The B737 uses the foot brakes. You push the pedals down, t...

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by Tristarsteve
Mon Feb 03, 2020 6:49 pm
Forum: Civil Aviation
Topic: AC MAD-YYZ: major damage to landing gear and engine on takeoff - circling MAD airspace
Replies: 140
Views: 30411

Re: AC MAD-YYZ: major damage to landing gear and engine on takeoff - circling MAD airspace

mcdu wrote:
MrBretz wrote:
I assume this 767 can not dump fuel?


The 767 can only dump fuel from the center tank. After you dump the center you have to burn the wing fuel or land overweight.


Yes but some B767 cannot dump fuel at all. The BA fleet was about half could dump, and half could not. No idea why.

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by Tristarsteve
Sun Feb 02, 2020 10:18 am
Forum: Technical/Operations
Topic: Why no Trim Tank in the A350?
Replies: 40
Views: 4101

Re: Why no Trim Tank in the A350?

Ref the B747-400 Stab Fuel Tank. When I worked at ARN i used to refuel the MH B744 for its 12 hr flight to KUL, and we sometimes used the stab tank. Now the MH and the BA B744 refuel tables were different. MH started using the stab tank at a much lower figure than BA. I seem to remember that MH was ...

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by Tristarsteve
Sat Feb 01, 2020 1:00 pm
Forum: Civil Aviation
Topic: Why didn’t 3 engine planes push out 4 engine planes like 2 engines did?
Replies: 118
Views: 18843

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

Was it possible to bring an DC-10 or L1011 “safe” to the ground with only the middle engine #2 running and delivering power? https://www.airliners.net/forum/viewtopic.php?t=763741 On a two engine ferry takeoff, one of the two engines that were working, failed on an Eastern Airlines ferry flight. (H...

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by Tristarsteve
Tue Jan 28, 2020 2:11 pm
Forum: Civil Aviation
Topic: Why didn’t 3 engine planes push out 4 engine planes like 2 engines did?
Replies: 118
Views: 18843

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

Would it be worth noting here that Boeing initially was designing the 777 to be a trijet? I believe ETOPS along with technological advancements rendered the 3rd engine as redundant (as has been discussed). IIRC, the MD11 was a little larger than the DC10 and was produced (by Boeing, when they acqui...

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by Tristarsteve
Sat Jan 25, 2020 6:46 pm
Forum: Technical/Operations
Topic: 777 crew rest area
Replies: 12
Views: 1932

Re: 777 crew rest area

The Malaysian B777 have cabin crew rest in a container in aft freight hold. Entry near R3 door.

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by Tristarsteve
Sat Jan 25, 2020 5:01 pm
Forum: Technical/Operations
Topic: 777 crew rest area
Replies: 12
Views: 1932

Re: 777 crew rest area

Some of the BA 777 200ER were delivered without crew rest, and had it fitted later by a 3rd party mod. The Boeing rest area was too expensive!

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by Tristarsteve
Thu Jan 23, 2020 8:16 pm
Forum: Civil Aviation
Topic: BA new A350 damaged at Tel Aviv
Replies: 36
Views: 20273

Re: BA new A350 damaged at Tel Aviv

... Maintenance ferry flights at BA are extremly rare. Getting permission for a flight outside the MEL / CDL / AMM is difficult. BA does weird things during IRROPS to save few dollars on mx,parts or passenger accommodation The infamous PHX-LHR 747 3-engine ferry. Of course, no one in USA can fix a ...

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by Tristarsteve
Thu Jan 23, 2020 11:20 am
Forum: Civil Aviation
Topic: BA new A350 damaged at Tel Aviv
Replies: 36
Views: 20273

Re: BA new A350 damaged at Tel Aviv

It is hard work to be the hanger queen of the fleet, but someone got to do it. Jokes aside, ferry flight is cruising at decent altitude, so damage maybe minimal, although this would have been a good test for field repair process. I would guess it is easy to repair A350 compared to 787 in the field,...

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by Tristarsteve
Tue Jan 21, 2020 6:00 pm
Forum: Technical/Operations
Topic: Deicing is aircraft type depending
Replies: 28
Views: 3416

Re: Deicing is aircraft type depending

Does the ice form during descend or on the ground? If ice on the wings forms during descend, shouldn't it also form during climb? Why is this no problem? Is fuel in winter heated before it's filled in the plane? The frost on fuel tanks forms on jet airliners on the ground when the moisture in the a...

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by Tristarsteve
Tue Jan 21, 2020 9:18 am
Forum: Technical/Operations
Topic: Boeing 777-300ER Landing Screeching Sound
Replies: 7
Views: 3578

Re: Boeing 777-300ER Landing Screeching Sound

inAjet wrote:
Sounds to me like the hydraulic demand pump(s).

The air driven hydraulic pump runs on landing to provide flow for spoiler extension. On B777 it is programmed to run. It doesn't,t wait for the demand, it anticipates it. Sit in the right seat and you hear it.

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by Tristarsteve
Sun Jan 19, 2020 4:46 pm
Forum: Civil Aviation
Topic: Transavia 737 Takes Off With Gear Pin In
Replies: 35
Views: 8794

Re: Transavia 737 Takes Off With Gear Pin In

Only thing I can imagine is that they used a towing truck to tow it to the runway in Ivalo. That's how the steering bypass could be forgotten because they didn't need it in Ivalo. This is of course easy to check, Ivalo must have records of it. That would also make sure who would have been responsib...

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by Tristarsteve
Sun Jan 19, 2020 3:09 pm
Forum: Civil Aviation
Topic: Ethiopian B737 opens cockpit window in flight, twice, to clear debris from windshield
Replies: 57
Views: 15898

Re: Ethiopian B737 opens cockpit window in flight, twice, to clear debris from windshield

What other choices? I’m sure they didn’t have the option of pulling into a sky truck stop to have the windshield cleaned. Kudos to the crew for their innovative thinking, from the YouTube video it is clear visibility would have been zero if they didn’t do something. Autoland? I've landed with some ...

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by Tristarsteve
Sun Jan 19, 2020 2:23 pm
Forum: Civil Aviation
Topic: Ethiopian B737 opens cockpit window in flight, twice, to clear debris from windshield
Replies: 57
Views: 15898

Re: Ethiopian B737 opens cockpit window in flight, twice, to clear debris from windshield

OP: Welcome to A.net Nightdesigns The captain was brave enough to clean the windshield by hand. Without this window cleaning bravery, it would be nearly impossible to land with zero visibility. I thought like cars, planes also had a windshield water sprayer, although with some additives and heater ...

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by Tristarsteve
Wed Jan 15, 2020 4:27 pm
Forum: Technical/Operations
Topic: Deicing is aircraft type depending
Replies: 28
Views: 3416

Re: Deicing is aircraft type depending

I used to work at Stockholm Arlanda for British Airways and have supervised the deicing of hundreds of aircraft. The fuel price at ARN was higher than LHR for BA, so the flight plan suggested to the crew that it was a good idea to tanker fuel into ARN. Sometimes the flight dispatcher would put the e...

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by Tristarsteve
Tue Jan 14, 2020 8:36 pm
Forum: Technical/Operations
Topic: MCDU door slide page EL/ER meaning ?
Replies: 4
Views: 1378

Re: MCDU door slide page EL/ER meaning ?

If you told us which aircraft it may help!!

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