Aviation

[gtb1943]

Thanks. I would still wait until we get concrete evidence to start speculating. The main theory I have seen floated is that it could be an inadvertent lower altitude set in the flight guidance, which would cause the auto throttle to go to idle, and would cause a lot of confusion. Deployment of the RAT would negate that theory.

Is it standard procedure to let the computer control take off?

 

[gtb1943]

I can't speak to the 787, but in the other airliners I have flown, the batteries alone can sustain flight for 15-30 minutes, with very limited systems. The systems shed to lower the load on the batteries to provide just the bear essentials. Generally, if you have time, you will use the batteries to start the APU, which will give you electrical power, like Sully did.

Each engine has a generator, the APU has a generator, the RAT is a generator, and you have the ship batteries.

what kind of APU do they have?

 

[CalPolyTechnique]

Thanks. I would still wait until we get concrete evidence to start speculating. The main theory I have seen floated is that it could be an inadvertent lower altitude set in the flight guidance, which would cause the auto throttle to go to idle, and would cause a lot of confusion. Deployment of the RAT would negate that theory.

Apparently they have audio of one of the pilot’s mayday call with the tower. The pilot noted “no thrust…no power…” I’m sure info will start trickling out the farther the investigation goes on.

 

[gtb1943]

no thrust
no power

was it the aircraft or the pilots or maybe a combination?

RIP

 

[CyberB0b]

Is it standard procedure to let the computer control take off?

No airliner can do an auto takeoff, but it is standard to use the flight guidance for all phases of flight. You can always turn it off if it messes up, but completely standard.

what kind of APU do they have?

Google says APS5000 APU from Pratt. APU is a tiny jet engine that produces power and bleed air. The 787 is different than all other airliners because it doesn't use bleed air to pressurize the cabin, so it might just produce electricity. I don't know much about the 787.

 

[gtb1943]

so it comes down to pilot error or the plane broke
pretty much all accidents end up one or the other

 

[triplets_93]

 

[triplets_93]

The Northrop B-2 Spirit

Each aircraft has a crew of two, a pilot in the left seat and mission commander in the right, and has provisions for a third crew member if needed. For comparison, the B-1B has a crew of four and the B-52 has a crew of five. The B-2 is highly automated, and one crew member can sleep in a camp bed, use a toilet, or prepare a hot meal while the other monitors the aircraft, unlike most two-seat aircraft. Extensive sleep cycle and fatigue research was conducted to improve crew performance on long sorties. Advanced training is conducted at the USAF Weapons School.

The Air Force plans to operate the B-2s until 2032, when the Northrop Grumman B-21 Raider is to replace them.

Armament

2 internal bays for ordnance and payload with an official limit of 40,000 lb ; maximum estimated limit is 50,000 lb. Ordnance options carried include:

80 - 500 lb class bombs (Mk-82, GBU-38) mounted on Bomb Rack Assembly (BRA)
36 - 750 lb CBU class bombs on BRA
16 - 2,000 lb class bombs (Mk-84, GBU-31) mounted on Rotary Launcher Assembly (RLA)
16 - B61 or B83 nuclear bombs on RLA (strategic mission)
Standoff weapon: AGM-154 Joint Standoff Weapon (JSOW) and AGM-158 Joint Air-to-Surface
Standoff Missile (JASSM)
2 - GBU-57 Massive Ordnance Penetrator (MOP) with a total of 60,000 lb

https://en.wikipedia.org/wiki/Northrop_B-2_Spirit

 

[rags747]

The Northrop B-2 Spirit

Each aircraft has a crew of two, a pilot in the left seat and mission commander in the right, and has provisions for a third crew member if needed. For comparison, the B-1B has a crew of four and the B-52 has a crew of five. The B-2 is highly automated, and one crew member can sleep in a camp bed, use a toilet, or prepare a hot meal while the other monitors the aircraft, unlike most two-seat aircraft. Extensive sleep cycle and fatigue research was conducted to improve crew performance on long sorties. Advanced training is conducted at the USAF Weapons School.

The Air Force plans to operate the B-2s until 2032, when the Northrop Grumman B-21 Raider is to replace them.

Armament

2 internal bays for ordnance and payload with an official limit of 40,000 lb ; maximum estimated limit is 50,000 lb. Ordnance options carried include:

80 - 500 lb class bombs (Mk-82, GBU-38) mounted on Bomb Rack Assembly (BRA)
36 - 750 lb CBU class bombs on BRA
16 - 2,000 lb class bombs (Mk-84, GBU-31) mounted on Rotary Launcher Assembly (RLA)
16 - B61 or B83 nuclear bombs on RLA (strategic mission)
Standoff weapon: AGM-154 Joint Standoff Weapon (JSOW) and AGM-158 Joint Air-to-Surface
Standoff Missile (JASSM)
2 - GBU-57 Massive Ordnance Penetrator (MOP) with a total of 60,000 lb

https://en.wikipedia.org/wiki/Northrop_B-2_Spirit

Typical Wikipedia, they say total max weight is 50k pounds then go on to list that it can carry 2 MOP’s for a total of 60k pounds.

 

[CyberB0b]

Typical Wikipedia, they say total max weight is 50k pounds then go on to list that it can carry 2 MOP’s for a total of 60k pounds.

They had to leave with a minimum amount of fuel and do multiple refueling in the air to accommodate the payload.

 

[gtb1943]

They had to leave with a minimum amount of fuel and do multiple refueling in the air to accommodate the payload.

Taking off at maximum capacity is not done unless they have to; virtually all long range missions have aircraft tank soon after take off.

It is a strain on the aircraft to take off at full; and reduces the life span of that aircraft.

 

[CyberB0b]

Taking off at maximum capacity is not done unless they have to; virtually all long range missions have aircraft tank soon after take off.

It is a strain on the aircraft to take off at full; and reduces the life span of that aircraft.

Not really, but you seem to be an expert on everything, so carry on.

 

[gtb1943]

Not really, but you seem to be an expert on everything, so carry on.

check it out dude
you will see that all aircraft manufacturers recommend not taking off at maximum capacity.

Just common sense; get some.

 

[Vtwin]

Typical Wikipedia, they say total max weight is 50k pounds then go on to list that it can carry 2 MOP’s for a total of 60k pounds.

It seems like it's been updated since Triplets copied and posted it.

I just clicked the link and read this

Armament

• 2 internal bays for ordnance and payload with an official limit of 40,000 lb (18,000 kg).[78] In its operational history, the maximum ordnance payload is 60,000 lb (27,000 kg). Ordnance options carried include:
  • 80× 500 lb (230 kg) class bombs (Mk-82, GBU-38) mounted on Bomb Rack Assembly (BRA)
  • 36× 750 lb (340 kg) CBU class bombs on BRA
  • 16× 2,000 lb (910 kg) class bombs (Mk-84, GBU-31) mounted on Rotary Launcher Assembly (RLA)
  • 16× B61 or B83 nuclear bombs on RLA (strategic mission)
  • Standoff weapon: AGM-154 Joint Standoff Weapon (JSOW) and AGM-158 Joint Air-to-Surface Standoff Missile (JASSM)[184][185]
  • 2× 30,000 lb (14,000 kg) GBU-57 Massive Ordnance Penetrator[186]

 

[gtb1943]

It seems like it's been updated since Triplets copied and posted it.

I just clicked the link and read this

Armament

• 2 internal bays for ordnance and payload with an official limit of 40,000 lb (18,000 kg).[78] In its operational history, the maximum ordnance payload is 60,000 lb (27,000 kg). Ordnance options carried include:
  • 80× 500 lb (230 kg) class bombs (Mk-82, GBU-38) mounted on Bomb Rack Assembly (BRA)
  • 36× 750 lb (340 kg) CBU class bombs on BRA
  • 16× 2,000 lb (910 kg) class bombs (Mk-84, GBU-31) mounted on Rotary Launcher Assembly (RLA)
  • 16× B61 or B83 nuclear bombs on RLA (strategic mission)
  • Standoff weapon: AGM-154 Joint Standoff Weapon (JSOW) and AGM-158 Joint Air-to-Surface Standoff Missile (JASSM)[184][185]
  • 2× 30,000 lb (14,000 kg) GBU-57 Massive Ordnance Penetrator[186]

you get that a lot with what the military says and what actually happens

to this day the military says the top speed of the Abrams is 45 MPH

When there has been countless documented evidence otherwise

 

[Flamma]

you get that a lot with what the military says and what actually happens

to this day the military says the top speed of the Abrams is 45 MPH

When there has been countless documented evidence otherwise

I also can't seem to find how high the B-2 can fly. I see it says it can go as high as 50,000 feet when dropping bombs. But how high with an empty payload?

 

[Tabascocat]

I also can't seem to find how high the B-2 can fly. I see it says it can go as high as 50,000 feet when dropping bombs. But how high with an empty payload?

I don’t think payload has anything to do with it, 50k is the max height. Now, the U-2 can get to 80k I believe.

 

[Flamma]

I don’t think payload has anything to do with it, 50k is the max height. Now, the U-2 can get to 80k I believe.

Yeah, I'm far from an expert. I just automatically assumed the weight made a difference in how high you can fly.

 

[triplets_93]

Status Report on recovery and examination of data from Black Boxes – Air India Flight AI-171

https://www.pib.gov.in/PressReleseDetailm.aspx?PRID=2139785

 

[CalPolyTechnique]

check it out dude
you will see that all aircraft manufacturers recommend not taking off at maximum capacity.

Just common sense; get some.

ORLY?

“All manufacturers recommend not taking off at max. capacity?”

Provide a few examples.