AS9100D
COC Aerospace has developed a repair for F-5 landing gear components
F-5 landing gears have tight tolerances with regards to repairs.
Example is the Main Landing Gear Cylinder and Nose Landing Gear Cylinder.
- Tight tolerances for the main upper cylinder bore diameter are from 3.000 to 3.004.
- Scratches and gouges need to be removed.
- Some gouges exceed 3.004 requiring the cylinder honed until it is oversized.
- Hard anodizing with will not provide enough build-up to achieve a bore of 3.004 or less.
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P2_1200.jpg)
Cold Spray Defined
Is an Additive Manufacturing Process.
Does not induce thermal stresses into the parent or deposited material.
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P3A.jpg)
Metallurgical testing the Cold Spray of Main Landing Gear Cylinder; P/N 14-40602
Test coupon of main landing gear cylinder gun-drilled, cold sprayed, cut into sections and tested every 2-3 inches for molecular adhesion, hardness, macro-micro inspections.
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P4A_1200.jpg)
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P4B_1200.jpg)
Preparing cylinder for Cold Spray.
Cylinder is gun drilled (honed) .005 – 008” to remove all damage to inside walls.
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P5A_1200.jpg)
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P5B_1200.jpg)
Cold Spraying inside of MLG Cylinder
Using COC-developed long-reach nozzle and ‘turntable’ that rotates the cylinder at the correct speed for the Cold Spray application.
The powder has a bond strength of 6,000 psi (ASTM-C633). Porosity >1% (MIL-STD-3021, Hardness: 91 HR-15Y, AI02 content 8-16%.
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P6A_1200.jpg)
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P6B_1200.jpg)
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P6C_1200.jpg)
Inner bore of MLG Cylinder is then re-honed back to the newly manufactured tolerances
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P7A_1200.jpg)
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P7B_1200.jpg)
Nickel-based Spraying
Cylinders are sprayed with a nickel-based material that is more durable than the 7075 aluminum.
Surface finish of the cylinder walls are 12-14, twice as smooth as T.O. requirement of 32.
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P8A_1200.jpg)
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P8B_1200.jpg)
Cylinders are honed after cold spray to 3.000-3.001”, back to original specifications
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P9A_1200.jpg)
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P9B_1200.jpg)
Inspection and Preparation
Cylinders are penetrant inspected, anodized and prepared for painting.
Dimensions are checked with digital bore gauge.
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P10A_1200.jpg)
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P10B_1200.jpg)
Outer Surface Finish
Outer cylinder Cold Spray is used to repair damage to outer surfaces of MLG Cylinder.
The areas are blended back to original dimensions.
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P11A_1200.jpg)
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P11B_1200.jpg)
COC’s Cold Spray MLG Cylinder Repair saves over 70% of new production and turn-around is as short as 90 days.
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/P12A_1200.jpg)
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/cold-spring-2.png)
![Image](https://coc-aerospace.com/wp-content/uploads/2023/09/F-5_Canopy_Rebuild-UPDATED.jpg)
Thank You
EXPERIENCE - OVER 5 DECADES YEARS SUPPORTING LEGACY AIRCRAFT
CUSTOMER SERVICE - OVER 50 YEARS SUPPORTING THE SAME CUSTOMERS
TRUST - ABOVE ALL, WE ALWAYS DO THE RIGHT THING
![Image](https://coc-aerospace.com/wp-content/uploads/2016/09/cropped-COC-Logo400x400.png)