Black Hawk Stabilator Bushing Reaming for In-Place Repair
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Solution Overview
Problem
Current methods for replacing worn or defective bushings in the stabilator of Black Hawk helicopters are costly and time-consuming, often requiring the stabilator to be removed and replaced, leading to significant downtime and reduced operational effectiveness, especially in remote or combat zones.
Innovation Solution
A maintenance and repair kit and process that allows for the replacement of worn or defective bushings in the stabilator without removing electrical wiring or brackets, using a spherical bushing removal tool to remove damaged bushings and ream new ones to exact tolerances, enabling on-site maintenance by trained technicians.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stabilator is removed and replaced when bushings wear out, then the helicopter can be returned to service quickly, but the downtime for removal and reinstallation is significant and the cost is high
Solution Approach 1:
The invention separates the bushing replacement operation from the entire stabilator replacement. By developing a specialized tool that accesses and replaces only the bushings within the stabilator assembly, the maintenance operation is segmented into a smaller, faster task that doesn't require removal of the entire stabilator or associated wiring and brackets.
Solution Approach 2:
The invention extracts the bushing removal function from the stabilator replacement process. The specialized tool is designed to reach through existing openings in the stabilator structure to remove and replace bushings in place, extracting only the worn components while leaving the stabilator assembly intact and mounted on the aircraft.
2Ease of repair
If a specialized bushing removal tool is developed for the Black Hawk stabilator, then on-site maintenance is enabled without removing electrical wiring and brackets, but the device complexity increases
Solution Approach 1:
The specialized bushing removal tool is designed to perform multiple functions: it removes worn bushings, installs new bushings, and does so through existing openings in the stabilator without requiring removal of electrical wiring or brackets. This multi-functionality is achieved within a single integrated tool design.
Solution Approach 2:
The invention introduces an intermediary tool that bridges the gap between the existing stabilator structure and the bushing replacement operation. The tool is designed to interface with the stabilator through existing openings and provide the necessary mechanical action to remove and replace bushings without directly modifying or removing the stabilator's electrical or structural components.
3Reliability
If the stabilator is replaced instead of repairing bushings, then operational capability is restored, but the cost increases significantly
Solution Approach 1:
The invention extracts only the worn bushings from the stabilator assembly for replacement, leaving the rest of the stabilator structure intact. This selective replacement approach removes the need for expensive full stabilator replacement while restoring the aircraft's operational capability.
Solution Approach 2:
The invention enables recovery and retention of the stabilator assembly by replacing only its worn bushing components. The stabilator structure, electrical wiring, and brackets are preserved and reused, discarding only the small, inexpensive bushings that have worn out.
Data Source
AI summary
The device disclosed herein allows a user to maintain the outboard stabilator of a Blackhawk helicopter. The device, which comprises a kit, allows a user to remove damaged outdoor stabilator bushings from a Blackhawk. Upon removal, the device enables a user to install new outdoor stabilator bushings. Additionally, the device allows a user to ream the newly installed outdoor stabilator bushings so that the outboard stabilator may be reinstalled upon the Blackhawk and safely flown.