Figure 11-4.--Typical finger-lock actuating cylinder.
B e c a u s e t h e t wo c o n t r o l va l ve s o p e r a t e
one-half; however, this force is sufficient to permit
handling of the aircraft at certain airspeeds (always
independently of each other as far as hydraulic
well above that required for a safe landing).
pressure is concerned, failure of either hydraulic
system does not render the actuator inoperative.
This complete actuator consists of the two isolated
Failure of one system does reduce the output force by
piston chambers, a shaft assembly with two pistons,
11-5