ICON A5 MM : Wing : Flaps : Maintenance Instructions : Flap Hinge Repair Procedure
Flap Hinge Repair Procedure
100173-00
If excess free play is identified upon inspection of the flap hinges, perform the following procedure.
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
14—Wing
Safety Equipment
As Needed
Consumables
LOCTITE® EA 9394
Task Instructions
1. There are two styles of flap hinge pin. One style retains the pin with snap rings and the other style uses cotter pins. Remove affected flap pins by removing snap rings (XSC-113) or cotter pins as needed.
2. Remove and inspect pins by measuring the minimum pin diameter with a mircrometer or caliper. If they are less than .175”, are loose or appear worn, replace.
3. Measure the inner diameter of the flap hinge and wing hinge bushings, using a gage pin or caliper. If they are greater than .195” replace as necessary using the following steps:
a. Extend the flaps to 30°.
b. Remove the AN4C13A bolt, MS21043-4 nut and two NAS1149C0432R washers that attach the flap pushrod to the flap surface of the affected flap.
c. Remove the hinge pins and 95630A460 PTFE washers from all three hinges of the affected flap.
d. Remove the flap from the wing. (Flap Surface Removal)
e. Press out the damaged bushing(s).
f. Prepare the new bushings by first soaking in isoproply alcohol, then lightly scuffing bonding surfaces with 80 grip aluminum oxide paper.
g. Mix a suitable quantity of LOCTITE® EA 9394 epoxy adhesive per manufacturer’s instructions.
h. Apply a coat of adhesive to both mating surface and press the new bushing into place.
i. Insert correct pin to ensure proper alignment of bushings while curing.
j. Wipe off any excess adhesive.
k. Allow the adhesive to cure.
l. Reinstall the flap. (Flap Surface Installation)
4. Reinstall flap pins using new snap rings or cotter pins.
Verification Method
Record results and check that wear is within these limits.
Maximum system free play = .020” radially
Minimum flap pin diameter = .175”
Maximum flap bushing diameter (wing hinges and flap hinges) = .195”
Inspect the flap system for proper function. (Inspect Flap Rigging)