jjsemperfi Posted May 1, 2012 Report Share Posted May 1, 2012 So I was wondering a while back how retractable gear helicopters and auto's work. If you experience a power failure (granted I'm pretty sure all retractable helicopters are multi engine) does the gear automatically retract? Quote Link to comment Share on other sites More sharing options...
apiaguy Posted May 2, 2012 Report Share Posted May 2, 2012 the gear would most likely be electrically or electric/hydraulic driven nowadays as most aircraft are... so an engine failure would have nothing to do with them going up or down. Quote Link to comment Share on other sites More sharing options...
jjsemperfi Posted May 2, 2012 Author Report Share Posted May 2, 2012 Do they automatically deploy? The last thing you want to do as a single pilot during an auto is worry about flipping a gear handle. Quote Link to comment Share on other sites More sharing options...
aeroscout Posted May 2, 2012 Report Share Posted May 2, 2012 Do they automatically deploy? The last thing you want to do as a single pilot during an auto is worry about flipping a gear handle.I can't think of any single engine helo retracts off the top of my head. 1 Quote Link to comment Share on other sites More sharing options...
rotorhead8 Posted May 2, 2012 Report Share Posted May 2, 2012 I can't think of any single engine helo retracts off the top of my head. AW119 Quote Link to comment Share on other sites More sharing options...
clay Posted May 2, 2012 Report Share Posted May 2, 2012 Agusta 119 and 119ke have fixed gear. Agusta 109 had retracts and is a twin. The gear have to be manually lowered if both engines fail. The hydraulic pump is driven off the transmission Quote Link to comment Share on other sites More sharing options...
aeroscout Posted May 2, 2012 Report Share Posted May 2, 2012 AW119No, and my point being an engine failure in a retract should be a non event regarding worrying about extending the gear, now if you lose the second engine... Quote Link to comment Share on other sites More sharing options...
SBuzzkill Posted May 3, 2012 Report Share Posted May 3, 2012 (edited) Bell 209 Prototype Edited May 3, 2012 by SBuzzkill Quote Link to comment Share on other sites More sharing options...
superstallion6113 Posted May 3, 2012 Report Share Posted May 3, 2012 Emergency blow down bottle on some , it uses nitrogen to pressurize the system and force the landing gear down. The S-92 has an electric backup hyd pump that kicks on automatically in a utility hyd system loss of pressure, still allowing you pressure to use the gear. On that helo though the pumps are driven by the main gearbox, so even in engine failure, you'd still have pressure to all the hydraulic systems. I'm sure most work this way in some way. Quote Link to comment Share on other sites More sharing options...
Azhigher Posted May 3, 2012 Report Share Posted May 3, 2012 I can't think of any single engine helo retracts off the top of my head. Yep, this. Quote Link to comment Share on other sites More sharing options...
iChris Posted May 3, 2012 Report Share Posted May 3, 2012 (edited) So I was wondering a while back how retractable gear helicopters and auto's work. If you experience a power failure (granted I'm pretty sure all retractable helicopters are multi engine) does the gear automatically retract? Do they automatically deploy? The last thing you want to do as a single pilot during an auto is worry about flipping a gear handle. During an emergency there may not be time to lower the gear. When other than manual power is used to operate the gear, emergency means must be provided for extending the gear. However, there are no requirements for any automatic deployment. An automatic system would be optional. The rotorcraft, although it may be damaged in emergency landing conditions must be designed as prescribed in Part 27 and Part 29 to protect the occupants under those conditions. The helicopter structure must be designed to give each occupant every reasonable chance of escaping serious injury in a crash landing if the wheels are still retracted. REF: 27.561, 27.729, 29.561, and 29.729 Edited May 3, 2012 by iChris Quote Link to comment Share on other sites More sharing options...
jjsemperfi Posted May 6, 2012 Author Report Share Posted May 6, 2012 Cool, I've always wondered about this, thanks gents Quote Link to comment Share on other sites More sharing options...
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