Van's Aircraft RV-12, Maintenance Manual

Page: 52 / 217

Rev. 5
3-16
S
TABILATOR
•
Check the main skin for damage or deformation.
•
Check the main skin fasteners by sighting along each rivet pattern for any
inconsistent rivet profile among similar properly installed rivets.
•
Inspect the Anti-Servo Tab hinges, fasteners, and safety wire for wear and security.
•
Inspect the spar box for cracks, deformation or signs of fatigue, especially the areas
surrounding the control horns, hinge brackets, and counterbalance brackets.
•
Use an Inspection mirror to inspect the ribs for cracks or deformation.
• Inspect the coating on the control horns, counterbalance brackets.
• Check the counterbalance arm for straightness and for interior/exterior corrosion,
remove bolts if necessary.
•
Make sure the counterbalance weights are secure and the fasteners are in good
condition.
•
Inspect the hinge brackets, stops, and fasteners for signs of wear and security.
•
Inspect the control horns and fasteners for wear and security.
• Check the control cable fasteners for security or signs of wear.
• The stabilator must swing smoothly and be limited only by the hinge stops. Make
sure that both hinge brackets on the tailcone contact their corresponding hinge stop
on the stabilator squarely and simultaneously.
A
NTI
-S
ERVO
T
AB
& P
ITCH
-
TRIM
S
ERVO
•
Check the anti-servo tab skins for damage or deformation.
•
Check the anti-servo tab fasteners by sighting along each rivet pattern for any
inconsistent rivet profile among similar properly installed rivets.
• Check the spar and attach hinge for deformation and signs of fatigue.
• Inspect the control horns and surrounding area for deformation, cracks, and signs of
fatigue.
•
Check the control horn fasteners for wear and security.
•
Inspect the pitch-trim servo push rod and link for damage or signs of fatigue.
•
Inspect the pitch-trim servo, and servo tray for deformation or cracks.
•
Check the fasteners and bushings that connect the pitch-trim servo tray to the
tailcone for security and wear. There should be very little movement in the tab when
the stabilator is held fixed.
•
Check the electrical connections and wire for condition and wear.
•
Test the operation of the AST by actuating the stabilator through its full range of
motion with the trim adjusted to the full nose up and full nose down settings. AST
movement must be smooth and relative to the stabilator movement. There must not
be any interference with the AST and the pitch-trim servo components at any point
of the stabilator travel.