Parking with flaps extended
Join Date: May 2006
Location: On the right of the clowns and to the left of the jokers
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Citation:
Correct, the 500/550/560 have cable systems in the flaps, the flaps are either electrically or hydraulicly (S550, Ultra, Encore, Excel) driven. There will be some tension on the cables in the system if the flaps are in any position other than the takeoff position (or the 15 degree position for aircraft with 2 intermediate positions) so they are most frequently left in this position to prolong the life of the cables. Leaving the flaps slightly extended also allows for more coprehensive walkaround checks.
Most checklists do not however invite you to extend the flaps before the walk around due to considerations of battery duration (electric) or the fact you'd need to start an engine (hydraulic)
HS-125:
The flaps are actuated by a hydraulic motor attached to a jack-screw. Whatever position they are in when the pressure is taken away they will remain in.
The inboard gear doors may however drop down as the pressure deminishes if the aircraft is allowed to stand for a longer period of time.
Leaving the flaps down on the HS is daft as you'll increase the chance of corroding the actuator jack-screw or damage resulting from towing etc.
Correct, the 500/550/560 have cable systems in the flaps, the flaps are either electrically or hydraulicly (S550, Ultra, Encore, Excel) driven. There will be some tension on the cables in the system if the flaps are in any position other than the takeoff position (or the 15 degree position for aircraft with 2 intermediate positions) so they are most frequently left in this position to prolong the life of the cables. Leaving the flaps slightly extended also allows for more coprehensive walkaround checks.
Most checklists do not however invite you to extend the flaps before the walk around due to considerations of battery duration (electric) or the fact you'd need to start an engine (hydraulic)
HS-125:
The flaps are actuated by a hydraulic motor attached to a jack-screw. Whatever position they are in when the pressure is taken away they will remain in.
The inboard gear doors may however drop down as the pressure deminishes if the aircraft is allowed to stand for a longer period of time.
Leaving the flaps down on the HS is daft as you'll increase the chance of corroding the actuator jack-screw or damage resulting from towing etc.
