G8000
Старожил
Причиной аварийной посадки стал конструктивный недостаток в системе уборки-выпуска шасси.
Изначально произошло разрушение гидрвалического соединения Cryofit Fitting. Оказалась интересная штука, никогда про такой не слышал.
en.wikipedia.org
Далее (по тексту как я понял), при использовании аварийного выпуска, при отсутсвии высокого давления в гидросистеме тяга замка выпущенного положения левой ООШ так и не встала в нужное положение и при этом не выдала индикацию экипажу о несоответствии положения.
При касании стойки в гидросистеме произошла нескомпенсированая пульсация давления (ввиду потери давления в гидросистеме) что привело к дальнейшему открытию замка выпущенного положения и складыванию шасси, говориться в
Изначально произошло разрушение гидрвалического соединения Cryofit Fitting. Оказалась интересная штука, никогда про такой не слышал.
Shape-memory coupling - Wikipedia
Далее (по тексту как я понял), при использовании аварийного выпуска, при отсутсвии высокого давления в гидросистеме тяга замка выпущенного положения левой ООШ так и не встала в нужное положение и при этом не выдала индикацию экипажу о несоответствии положения.
При касании стойки в гидросистеме произошла нескомпенсированая пульсация давления (ввиду потери давления в гидросистеме) что привело к дальнейшему открытию замка выпущенного положения и складыванию шасси, говориться в
A component failure and a design flaw combined to cause the loss of a Northrop Grumman B-2 bomber 2 1/2 years ago, a newly released accident investigation report says.
The left main landing gear collapsed moments after the aircraft landed on Dec. 9, 2022, at Whiteman AFB, Missouri, causing the B-2 to drag its left wing along the runway and the grass apron for several thousand feet. The U.S. Air Force decided last year to scrap the aircraft, reducing the B-2 fleet to 19 aircraft.
The stealth bomber’s problems that day started minutes earlier with a failure in the right main landing gear.
As the crew approached the landing, a Cryofit coupling joining high-pressure hydraulic tubing failed, dumping the hydraulic fluid used to lower the right main landing gear, the report said.
The crew activated an emergency gear extension system, which snapped the right main landing gear into a locked position before landing.
The hydraulic fluid loss and the activation of the emergency system, however, exposed a design flaw that caused the left main landing gear to collapse, the report shows.
The same method used by the emergency system to lower the right main landing gear produced an unexpected result on the left side. An absence of high pressure force caused a slight retraction of the lock link assembly of the left main landing gear, but not enough to send an alert to the cockpit warning of an unlocked gear.
On top of that, the landing caused the truck position actuator (TPA) on the left main landing gear to compress by 2 in. The compression is normal during landing, and creates a brief hydraulic pressure pulse through the landing gear system.
But due to the pressure drop caused by the Cryofit coupling failure in this case, the pulse created a pull force that further retracted the lock assembly on the left main landing gear, the report says. The left main landing gear then became unlocked and buckled under the weight of the aircraft.
The left main landing gear collapsed moments after the aircraft landed on Dec. 9, 2022, at Whiteman AFB, Missouri, causing the B-2 to drag its left wing along the runway and the grass apron for several thousand feet. The U.S. Air Force decided last year to scrap the aircraft, reducing the B-2 fleet to 19 aircraft.
The stealth bomber’s problems that day started minutes earlier with a failure in the right main landing gear.
As the crew approached the landing, a Cryofit coupling joining high-pressure hydraulic tubing failed, dumping the hydraulic fluid used to lower the right main landing gear, the report said.
The crew activated an emergency gear extension system, which snapped the right main landing gear into a locked position before landing.
The hydraulic fluid loss and the activation of the emergency system, however, exposed a design flaw that caused the left main landing gear to collapse, the report shows.
The same method used by the emergency system to lower the right main landing gear produced an unexpected result on the left side. An absence of high pressure force caused a slight retraction of the lock link assembly of the left main landing gear, but not enough to send an alert to the cockpit warning of an unlocked gear.
On top of that, the landing caused the truck position actuator (TPA) on the left main landing gear to compress by 2 in. The compression is normal during landing, and creates a brief hydraulic pressure pulse through the landing gear system.
But due to the pressure drop caused by the Cryofit coupling failure in this case, the pulse created a pull force that further retracted the lock assembly on the left main landing gear, the report says. The left main landing gear then became unlocked and buckled under the weight of the aircraft.