Hypothetical - Robinson Total Electrical Failure
That might work well at sea level, less so at higher density altitude.
It was suggested to roll the throttle back so rpm drops slightly (a few percent), at that point you can fly it without issues or further adjustment.
The aircraft will operate just fine with a slight droop and it eliminates any chance of an overspeed for the throttle challenged.
It was suggested to roll the throttle back so rpm drops slightly (a few percent), at that point you can fly it without issues or further adjustment.
The aircraft will operate just fine with a slight droop and it eliminates any chance of an overspeed for the throttle challenged.
How long will the battery last once the ALT failure light comes on? It depends. I'd say between 15 min and 60 min
Join Date: Apr 1998
Location: Mesopotamos
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
Had a gen failure followed by a battery failure in a jetbox (it was cart started). The press-to-test button didn't light up anything on the enunciator panel during the flight, the radios went dead, however the baro instruments, engine indicators and tachos were still working. Don't know if the FCU has electrics but both fuel pumps read zero pressure and a slight lateral twitch was observed confirmed by the Tq gauge flickering 1%. A smoothly handled steep approach back to base was no drama.
Young people tend to get too focussed on the numbers with these relatively simple machines (I know I did), but at the early learning stages they should step back a bit and it will be easier to keep the numbers where they should be, as experience builds they can then do things in a jetbox like keeping the RRPM right at the very bottom of the green arc in a stretched auto as the audible horn screams. Should the electrics go TU and the donk is still running then the situation is still quite salvageable - don't panic as they say.
Young people tend to get too focussed on the numbers with these relatively simple machines (I know I did), but at the early learning stages they should step back a bit and it will be easier to keep the numbers where they should be, as experience builds they can then do things in a jetbox like keeping the RRPM right at the very bottom of the green arc in a stretched auto as the audible horn screams. Should the electrics go TU and the donk is still running then the situation is still quite salvageable - don't panic as they say.
Electronic tachs and governor - need electricity from somewhere. Either Alt or Bat. That’s it.
Bell 47, with total electrical failure. Lose radio/ICS, strobe light, the ability to turn the hydraulic’s off, and the starter motor.
Depending where you are, you might not notice till you try and restart it.
I fly a twin turbine computer now. Autopilot fails the test a few times? - Shut it down, and “restart” it - painful. (Both engines off, all power off - almost expect an “Apple” symbol somewhere on the restart......)
That’s why they call them the GOOD old days....
Although I love the “synthetic vision”
Bell 47, with total electrical failure. Lose radio/ICS, strobe light, the ability to turn the hydraulic’s off, and the starter motor.
Depending where you are, you might not notice till you try and restart it.
I fly a twin turbine computer now. Autopilot fails the test a few times? - Shut it down, and “restart” it - painful. (Both engines off, all power off - almost expect an “Apple” symbol somewhere on the restart......)
That’s why they call them the GOOD old days....
Although I love the “synthetic vision”
Fan scroll nut cotter pin is still aligned with stripe? As described here at 7m 40s? Not sure if there's another way
https://www.youtube.com/watch?v=2VcBXjMGhIM&t=07m40s
https://www.youtube.com/watch?v=2VcBXjMGhIM&t=07m40s
Thread Starter
Join Date: Mar 2011
Location: Earth
Posts: 172
Likes: 0
Received 0 Likes
on
0 Posts
What's the answer then? I cannot find anything mentioning post-flight indications of an overspeed in the POH or learning materials. MR gearbox teletemp?
It often depends on how high the overspeed was,...and with no tach, well,...?
This is why trying to continue flying after total electrical failure is stupid. Sure you could pull it off with your Superman ears, but unless there was absolutely no place to land before your battery finally dies, you'll probably get fired upon your triumphant return.
