 | This modification can be installed with the seat frame in place, but the
removal of the seat assembly gives greater access to the brake master cylinder
area. Batteries located under the front seat should be disconnected
before seat removal. |
| Two fabric reinforcements will need to be added to provide access holes
through which the brake master cylinder fasteners can be accessed.
Install the reinforcements as detailed in installation drawing MC-Install-1.
This should be done in accordance with AC43.13 and the fabric manufacturer's
installation instructions. |
| Remove the brakes inter-connect rods and discard. |
| Remove original Scott master cylinders. |
| Remove parking brakes and check condition assembly and associated
connecting fittings. Inspect and replace components as necessary. |
| Install original parking brakes onto new Dakota Cub Aircraft - High
Pressure Brake Master Cylinder body using thread sealant compatible with
MIL-H-5605 fluid on all "pipe thread" joints. Piston travel is preset at
the factory. If the unit has been disassembled a check of the clearance
between the piston and snap ring must be checked. The dimension between
the snap ring and piston should be adjusted to .035-.045. Use a feeler
gauge to verify this dimension. The adjustment is made by removing the
locking set screw and adjusting the second set screw to furnish the correct
dimension. Reinstall the locking set screw. |
| Place new master cylinder into position. It is advantageous to
connect the brake lines and install the AN3-10A bolts in the master cylinder
as it is placed to prevent an interference with the stick torque tube and seat
frame (if seat was not removed). Tighten fasteners and brake line
connections. |
| Install new adjustable brake pedal inter-connect rods and adjust length to
allow the master cylinder pedal to return to its seated position. See
drawing MC-Install-2. |
| Bleed brake system from bottom to top until fluid is viewed at the base of
the cover filler neck opening. Use MIL-H-5606 fluid only. |
| With aircraft in a flying position (tail elevated). Pump brake
pedals slowly (1 cycle / 3-5 seconds) to allow air trapped in the piston area
to be displaced by reservoir fluid. Braking action will increase in
firmness as trapped air is displaced. Check all system connections for
leaks. Check fluid level and top off reservoir before lowering tail.
Reinstall reservoir plug. |
| Placard panel "This Aircraft is Equipped With High Pressure Brake Master
Cylinders - Aggressive Braking Action COULD Result In Aircraft Damage." |
| Perform full power run up to check braking action. Tires may slide
on a hard surface but not roll. |
CAUTION!
An elevated awareness of the increased braking capabilities must be realized.
Aggressive braking action COULD result in aircraft damage. Become
completely familiar with the increased braking performance PRIOR to any
aggressive brake action.
Locate 4" x 7" fabric reinforcements directly below master cylinder
attachment points with 2" separation. Install reinforcements in accordance
with AC 43.13 and the fabric manufacturers installation instructions.
Attach front inter-connect rod clevis to brake pedal arm using AN3-5 bolt,
AN960-3 washer, MS17825 self-locking castellated nut, and MS24665 cotter pin.
Attach rear inter-connect rod clevis to brake pedal arm using AN3-10 bolt,
AN960-3 washer, MS17825 self-locking castellated nut, and MS24665 cotter pin.
Adjust rod length to provide 1/32" - 1/16" free play. This prevents the
front pedal from inadvertently applying brakes and allows the reservoir to
properly fill the system.
