airbusb0y From Sri Lanka, joined Dec 2010, 9 posts, RR: 0 Posted (3 years 11 months 2 weeks 6 days 8 hours ago) and read 3183 times:
Hello a few questions about the MD11,
1. Where is the yaw damper on the MD11 exactly located?
2. What and how does the dual rudder work?
3. Does the MD11 have trim tabs on the rudder?
Does any one have a detailed empennage drawing of the MD11. I've checked Boeing's technical section, but it was just general schematics. If any one could kindly send me a picture if they have access to it.
CosmicCruiser From United States of America, joined Feb 2005, 2255 posts, RR: 15
Reply 1, posted (3 years 11 months 2 weeks 5 days 10 hours ago) and read 2958 times:
1. ask a mechanic
2. The upper rudder is powered by hyd sys 1 and the lower rudder hyd sys 2. each rudder consists of a forward and aft section. The aft section of the upper & lower rudders are bused to move as the forward sections.
Wingscrubber From UK - England, joined Sep 2001, 854 posts, RR: 0
Reply 2, posted (3 years 11 months 2 weeks 4 days ago) and read 2711 times:
Clarification on trim - there are no trim TABS on the MD-11, they would be useless on a hydraulically powered rudder, the trim is probably mechanical-electric input and likely works either with bias on the rudder PCU control cables or a separate screwjack input directly at the rudder at a guess. Maybe an MD-11 mech will come enlighten us shortly.
Not sure what you're asking. The rudder is split into an upper and lower rudder. Several aircraft have this design. It provides for redundancy in the case of a single, or in some cases, a dual hydraulic failure. I'm sure there are some aerodynamic considerations, but they are beyond my level of caring.