[HN Gopher] Boeing MAX has yet another hidden system called LRD,...
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       Boeing MAX has yet another hidden system called LRD, that is
       causing issues
        
       Author : dz0ny
       Score  : 12 points
       Date   : 2025-02-09 22:12 UTC (49 minutes ago)
        
 (HTM) web link (www.youtube.com)
 (TXT) w3m dump (www.youtube.com)
        
       | dz0ny wrote:
       | This is a more complicated issue that might also be present on
       | Airbus aircraft, but so far, it has only caused problems on two
       | Boeing planes and same as MCAS, was also not disclosed to pilots.
       | 
       | https://www.seattletimes.com/business/boeing-aerospace/faa-t...
        
       | toomuchtodo wrote:
       | "Load reduction device."
       | 
       | https://www.airliners.net/forum/viewtopic.php?t=1497965
       | 
       | > Found on many engines, LRDs reduce dynamic loads transferred
       | from a severely damaged fan to surrounding structure, including
       | the engine pylon. On the Leap, fuse bolts break away and
       | disconnect the fan rotor from the engine core.
       | 
       | > On the Leap-1B, an LRD activation also opens an oil sump,
       | releasing oil into the engine flow path ahead of pneumatic bleed
       | ports that divert air to the aircraft for pressurization and
       | temperature control. The No. 1 engine's air conditioning pack
       | primarily supplies the cockpit, while the No. 2 engine's pack
       | supplies cabin air.
       | 
       | This failure mode can saturate internal pressure compartments
       | with toxic substances due to the bleed air system off the engine
       | compressor.
        
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       (page generated 2025-02-09 23:01 UTC)