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Can the landing gear come down automatically during a normal deployment when the airspeed drops? Or does the crew need to cycle the landing gear lever?
When the RAT turbine is out and the engines failed, the only way to deploy the landing gear would be by gravity. Maybe that difference is why it worked after the engines failed, and failed before the first landing.
STS: Can you test how the behaviour would be like during a really steep approach? If the aircraft was really at 7000 ft when 10 NM away from the runway, instead of 3000 ft, it should be a very fast glide down. The pilot did ignore multiple calls from ATC to reduce altitude to the correct schedule for landing.
---------- Post added at 11:21 ---------- Previous post was at 11:08 ----------
When both engines failed and the RAT is out, only the blue hydraulic system will be pressurized, while the other two systems will be unpowered.
This means no hydraulic power to the landing gear after both engines failed.
---------- Post added at 11:29 ---------- Previous post was at 11:21 ----------
Found something:
"Elimination of gear lever neutral position through automatic depressurization of landing gear hydraulic supply above 260kt"
The logic there sounds like the crew has to cycle the landing gear lever below 260 kt to deploy the landing gear, if this was attempted "accidentially" above 260 kt.
When the RAT turbine is out and the engines failed, the only way to deploy the landing gear would be by gravity. Maybe that difference is why it worked after the engines failed, and failed before the first landing.
STS: Can you test how the behaviour would be like during a really steep approach? If the aircraft was really at 7000 ft when 10 NM away from the runway, instead of 3000 ft, it should be a very fast glide down. The pilot did ignore multiple calls from ATC to reduce altitude to the correct schedule for landing.
---------- Post added at 11:21 ---------- Previous post was at 11:08 ----------
When both engines failed and the RAT is out, only the blue hydraulic system will be pressurized, while the other two systems will be unpowered.
This means no hydraulic power to the landing gear after both engines failed.
---------- Post added at 11:29 ---------- Previous post was at 11:21 ----------
Found something:
"Elimination of gear lever neutral position through automatic depressurization of landing gear hydraulic supply above 260kt"
The logic there sounds like the crew has to cycle the landing gear lever below 260 kt to deploy the landing gear, if this was attempted "accidentially" above 260 kt.
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