Adjusting the parking brake on a Lycoming O-235-C and O-290-D aircraft engine is a straightforward process, but it requires careful attention to detail to ensure safety and proper functioning. click here for more details on the download manual…..
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Here’s a simple guide to help you understand the steps involved in adjusting the parking brake:
### Tools and materials Needed:
– **Wrench or socket set**: To adjust the brake cable.
– **Screwdriver**: Depending on the type of fasteners used.
– **Safety goggles**: To protect your eyes.
– **Torque wrench**: If specified in the maintenance manual.
### Steps to Adjust the Parking Brake:
1. **Safety First**:
– Ensure the aircraft is parked on a level surface.
– Set chocks behind the wheels to prevent the aircraft from moving.
– Wear safety goggles to protect your eyes from debris.
2. **Locate the Parking Brake Control**:
– The parking brake control is usually found near the pilot’s seat. It can be a lever or a pedal that you push down to engage the brake.
– Familiarize yourself with how it operates before making any adjustments.
3. **Check the Current Brake Operation**:
– Before adjusting, test the parking brake by engaging it and attempting to move the aircraft slightly.
– If the aircraft rolls or the brake feels loose, it may need adjustment.
4. **Find the Brake Cable**:
– Locate the brake cable that connects the parking brake control to the braking mechanism. This cable is typically routed under the floor or behind the panel.
5. **Adjust the Brake Cable**:
– Look for an adjustment nut on the brake cable. This is often found near the parking brake control or at the brake mechanism itself.
– Use a wrench to loosen the locknut (if present) on the adjustment nut.
– Turn the adjustment nut clockwise to tighten the cable (which increases brake tension) or counterclockwise to loosen it (which decreases brake tension).
– Make small adjustments and check the brake operation after each adjustment.
6. **Test the Brake Again**:
– After making adjustments, re-engage the parking brake and test it again by trying to push the aircraft.
– Repeat the adjustment if necessary until the brake holds the aircraft securely when engaged.
7. **Secure All Components**:
– Once satisfied with the brake adjustment, make sure to tighten the locknut to secure the adjustment.
– Double-check that all tools and materials are removed from the area.
8. **Record the Maintenance**:
– It’s a good practice to document any adjustments made to the parking brake in the aircraft’s maintenance log for future reference.
### Final Thoughts:
Adjusting the parking brake is a critical maintenance task that ensures your aircraft is safe
and secure when parked. Always consult the aircraft’s maintenance manual for specific instructions and torque specifications, as there may be slight variations between different models. If you are unsure about any step, consider seeking assistance from a qualified mechanic.
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