Aircraft Pushback Single-Point Disconnect System
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Solution Overview
Problem
Conventional three-point disconnect methods for tow bars from aircraft are time-intensive, leading to aircraft departure delays and fuel inefficiency, while single-point disconnect methods risk damaging the aircraft's nose landing gear due to improper alignment and angle issues during disconnection.
Innovation Solution
A system utilizing sensor assemblies and an indicator panel to ensure the tow bar is aligned within a threshold angle and the steering wheels are straight, emitting color-coded lights to guide the driver for safe disconnection, and incorporating a roller assembly to prevent damage during yoke-style tow bar disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three-point disconnect operation is used, then safety and reliability are improved, but time consumption and operational efficiency deteriorate
Solution Approach 1:
The disconnect operation is segmented into two independent phases: (1) automatic disconnect from aircraft nose gear via sensor-triggered mechanism, and (2) manual retrieval of tow bar. This segmentation allows the critical safety aspect (disconnect from aircraft) to be automated while minimizing total operation time.
Solution Approach 2:
The system uses sensor assemblies and indicator panels to automatically detect alignment conditions and trigger the disconnect mechanism without requiring manual intervention for the critical disconnect action, making the system self-serve for the safety-critical function.
2Productivity
If single-point disconnect operation is used, then time efficiency is improved, but risk of damage to nose landing gear worsens
Solution Approach 1:
Sensor assemblies continuously monitor alignment conditions before disconnect is initiated. The system performs preliminary alignment verification and provides visual feedback through indicator panels, ensuring proper alignment is achieved before the automatic disconnect action occurs, preventing damage during the rapid single-point disconnect operation.
Solution Approach 2:
Indicator panels provide real-time visual feedback to operators about alignment status, and sensor assemblies provide feedback control by detecting when alignment thresholds are met before triggering automatic disconnect, ensuring safe operation during high-speed disconnect.
3Ease of operation
If manual alignment checking is used, then operational simplicity is maintained, but measurement precision and alignment accuracy deteriorate
Solution Approach 1:
Manual visual alignment checking is replaced with automated sensor assemblies that use optical or proximity sensors to precisely measure alignment conditions. Indicator panels translate these precise measurements into simple visual signals for operators, maintaining ease of operation while dramatically improving measurement precision.
Data Source
AI summary
A single point disconnect system useful for pushback of an aircraft using a tow bar and a vehicle includes a first sensor assembly that determines whether an angle of the tow bar respective to a surface of the vehicle to which the tow bar is coupled exceeds a threshold limit, a second sensor assembly that determines the direction of the wheels of the vehicle that are responsible for steering the vehicle, and an indicator panel. The indicator panel includes a first light module and a second light module that are coupled to the first sensor assembly and the second sensor assembly, respectively. The first light module emits light that indicates the angle of the tow bar respective to the surface of the vehicle and the second light module emits light that indicates the direction of the wheels of the vehicle.