HAWK21M
Topic Author
Posts: 30014
Joined: Fri Jan 05, 2001 10:05 pm

### B747 Rudder Balance.

View Large View Medium

What is the procedure for Rudder Balancing on the B747 on line.Can it be done by Calculation Method.
regds
MEL
I may not win often, but I damn well never lose!!!

EMBQA
Posts: 7800
Joined: Sat Oct 25, 2003 3:52 am

### RE: B747 Rudder Balance.

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"

miamiair
Posts: 4249
Joined: Thu Jul 15, 2004 9:42 pm

### RE: B747 Rudder Balance.

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.
Molon Labe - Proud member of SMASH

HAWK21M
Topic Author
Posts: 30014
Joined: Fri Jan 05, 2001 10:05 pm

### RE: B747 Rudder Balance.

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
I may not win often, but I damn well never lose!!!

747NUT
Posts: 77
Joined: Sun Sep 05, 2004 12:24 am

### RE: B747 Rudder Balance.

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 !

miamiair
Posts: 4249
Joined: Thu Jul 15, 2004 9:42 pm

### RE: B747 Rudder Balance.

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).
Molon Labe - Proud member of SMASH

HAWK21M
Topic Author
Posts: 30014
Joined: Fri Jan 05, 2001 10:05 pm

### RE: B747 Rudder Balance.

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
I may not win often, but I damn well never lose!!!

miamiair
Posts: 4249
Joined: Thu Jul 15, 2004 9:42 pm

### RE: B747 Rudder Balance.

That's what the SRM is describing.
.
.
Molon Labe - Proud member of SMASH

CCA
Posts: 778
Joined: Wed Oct 02, 2002 7:29 pm

### RE: B747 Rudder Balance.

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
P1 in A330, A340, A346, B742, B744, B748.

miamiair
Posts: 4249
Joined: Thu Jul 15, 2004 9:42 pm

### RE: B747 Rudder Balance.

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

Reference: Boeing Document D634U103, 51-60-01 & 51-60-02.
Molon Labe - Proud member of SMASH

### Who is online

Users browsing this forum: charles022, jakubz, TOGA10 and 23 guests

### Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos