EMBQA From United States of America, joined Oct 2003, 9286 posts, RR: 13 Reply 1, posted (8 years 4 months 4 weeks 12 hours ago) and read 2673 times:
The rudder on the 747 is hydraulically actuated and not required to be balanced. Dampers in the system reduce any flutter, which is the main reason for balancing. This holds true with most any hydraulically controlled flight surface.
"It's not the size of the dog in the fight, but the size of the fight in the dog"
The rudder can be rebalanced by the calculation method without removing the unit from the aircraft. But if balance weight need to be added/removed, removal is required.
HAWK21M From India, joined Jan 2001, 31201 posts, RR: 58 Reply 3, posted (8 years 4 months 3 weeks 6 days 17 hours ago) and read 2584 times:
Consider the Above Example.After the rudder is balanced & refitted to the Vertical fin The logo will need to be painted on the Fin area to match the Painted rudder [Done earlier].
Will this balancing be done by adding/removal of balance weights.
regds
MEL
747NUT From Australia, joined Sep 2004, 78 posts, RR: 0 Reply 4, posted (8 years 4 months 3 weeks 5 days 18 hours ago) and read 2519 times:
Any flight surface has an upper and lower balance limit. When they are balanced off the aircraft as per a jig method, the idea is to balance it as close to the lower limit and then fitted.
This will allow you a bit of room to add weight to the surface i.e. painting or repairs, without adding balance weights, during the calculation method.
The rudder on the 747 is hydraulically actuated and not required to be balanced. Dampers in the system reduce any flutter, which is the main reason for balancing. This holds true with most any hydraulically controlled flight surface.
As far as I am aware every flight surface is balanced as per the SRM, and the dampers in the system are mainly used to prevent the surface knocking around in the wind when the hydraulics aren't pressurized
Miamiair From , joined Dec 1969, posts, RR: Reply 5, posted (8 years 4 months 3 weeks 5 days 17 hours ago) and read 2516 times:
The only balanced flight surfaces on the 747-100/-200/-300 are the outboard aileron (SRM 51-80-01), the outboard elevator (SRM 51-80-02) and the upper rudder (SRM 51-80-03).
HAWK21M From India, joined Jan 2001, 31201 posts, RR: 58 Reply 6, posted (8 years 4 months 3 weeks 5 days 17 hours ago) and read 2507 times:
The only balanced flight surfaces on the 747-100/-200/-300 are the outboard aileron (SRM 51-80-01), the outboard elevator (SRM 51-80-02) and the upper rudder (SRM 51-80-03).
Are you saying the Rudder is not Balanced.
regds
MEL
CCA From Hong Kong, joined Oct 2002, 708 posts, RR: 14 Reply 8, posted (8 years 4 months 3 weeks 5 days 3 hours ago) and read 2458 times:
As Miamiair said only the upper rudder is balanced on the "classic" the -400 has 3 separate PCUs on the upper rudder while the classic has a single tandem PCU which is why it requires balancing and the -400 doesn't.
Sponsor Message: 
From India, joined Jan 2001, 31201 posts, 
From United States of America, joined Oct 2003, 9286 posts, 
From Australia, joined Sep 2004, 78 posts, 
From Hong Kong, joined Oct 2002, 708 posts, 
Sponsor Message: 
Printer friendly format
