ICON A5 MM : Flight Controls : Pitch Trim Tab : Inspection Instructions : Measure Pitch Trim Tab Wear
Measure Pitch Trim Tab Wear
100412-00
Use the following procedure to measure wear of the pitch trim tab.
Applicable Aircraft Serial Numbers
All
Type of Maintenance
Line
Level of Certification
LSA-RM
Task Specific Training Required
No
Special Tools Required
None
Parts Required
None
Aircraft System and Number
06—Flight Controls
Safety Equipment
As Needed
Consumables
None
Task Instructions
1. Hold the elevator so that its trailing edge aligns with the horizontal tail tips (take the average if left and right align differently) throughout this procedure. Use adhesive tape between elevator trailing edge and elevator tips to temporarily align the elevator to neutral deflection in alignment with the horizontal tail tips.
2. Secure digital inclinometer to the top of the trim tap surface with double-side tape. Ensure that its long axis is perpendicular to tab hinge line and that it does not interfere with tab operation.
3. Operate the trim tab until its trailing edge aligns with that of the elevator. Zero the inclinometer.
4. While securing the elevator with a free hand, Push on the bottom surface of the pitch trim tab, until all upward free play has been removed from the system. Record level reading.
5. While securing the elevator with a free hand, Push on the top surface of the pitch trim tab, until all downward free play has been removed from the system. Record level reading.
6. Alternatively, repeat procedure, while measuring displacement due to free play with a scale at the TE of the pitch trim tab.
7. If the flight surface throw readings are out of tolerance, inspect the maximum diameter of the pitch trim tab control horn hole.
8. Remove inclinometer and any tape used to secure it to the elevator trailing edge.
Verification Method
Record results and check that free play is within these limits. If the tolerance are not met, replace pitch tab actuator and push rod.
Maximum system wear =+/-1° of pitch trim tab TE free play or +/-.081 inch of linear travel at TE of pitch trim tab
Record results and check trim tab control horn hole is within these limits. If tolerance is larger than specified, repair is required. Contact ICON for repair.
Maximum trim tab control horn hole diameter = Ø.160 inch