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B747 Rudder Balance.  
User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Posted (9 years 7 months 3 days 14 hours ago) and read 3269 times:


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What is the procedure for Rudder Balancing on the B747 on line.Can it be done by Calculation Method.
regds
MEL



Think of the brighter side!
9 replies: All unread, jump to last
 
User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 1, posted (9 years 7 months 3 days 13 hours ago) and read 3225 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"
User currently offlineMiamiair From , joined Dec 1969, posts, RR:
Reply 2, posted (9 years 7 months 2 days 21 hours ago) and read 3162 times:

Ref: B747-100/-200/-300 SRM 51-80-03 "Upper Rudder Rebalancing."

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.


User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 3, posted (9 years 7 months 2 days 19 hours ago) and read 3136 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



Think of the brighter side!
User currently offline747NUT From Australia, joined Sep 2004, 78 posts, RR: 0
Reply 4, posted (9 years 7 months 1 day 20 hours ago) and read 3071 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




If it's not broken, don't fix it !
User currently offlineMiamiair From , joined Dec 1969, posts, RR:
Reply 5, posted (9 years 7 months 1 day 19 hours ago) and read 3068 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).

User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 6, posted (9 years 7 months 1 day 18 hours ago) and read 3059 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



Think of the brighter side!
User currently offlineMiamiair From , joined Dec 1969, posts, RR:
Reply 7, posted (9 years 7 months 1 day 18 hours ago) and read 3055 times:

That's what the SRM is describing.
.
.


User currently offlineCCA From Hong Kong, joined Oct 2002, 827 posts, RR: 14
Reply 8, posted (9 years 7 months 1 day 5 hours ago) and read 3010 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.

Rgds CCA



C152 G115 TB10 CAP10 SR-22 Be76 PA-34 NDN-1T C500 A330-300 A340-300 -600 B747-200F -200SF -400 -400F -400BCF -400ERF -8F
User currently offlineMiamiair From , joined Dec 1969, posts, RR:
Reply 9, posted (9 years 7 months 18 hours ago) and read 2975 times:

On the 747-400, only the outboard aileron and outboard elevator get balanced.

Reference: Boeing Document D634U103, 51-60-01 & 51-60-02.


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