What are the key considerations when planning a brake system overhaul on a transport aircraft?

• A. Overlook discs and pads but check anti-skid sensors.
• B. Inspect discs/pads for wear, replace lines and seals as required, verify anti-skid sensors and wheel speed sensors, check hydraulic fluid, and perform functional testing after overhaul.
• C. Do not perform any testing after overhaul.
• D. Only update software.

Answer: (B)

A brake system overhaul must be a comprehensive, end-to-end process that covers wear inspection of discs and pads, replacement of hydraulic lines and seals as required, verification of anti-skid and wheel speed sensors, checking the hydraulic brake fluid quality and level, and performing functional testing after the overhaul. Inspecting the discs and pads ensures you know the actual braking torque available and catch wear that could lead to fade or failure. Replacing lines and seals prevents leaks and maintains proper hydraulic pressure, which is essential for predictable braking response. Verifying the anti-skid sensors and wheel speed sensors ensures the braking system’s safety features will function correctly during landing and taxi, preventing false readings that could undermine braking effectiveness. Checking the hydraulic fluid—its level, cleanliness, and contamination state—protects against corrosion, moisture-related issues, and inconsistent braking performance. Finally, functional testing after the overhaul validates that all components work together as intended, that there are no leaks, and that the braking and anti-skid systems respond within limits under simulated operating conditions.

Overlooking discs and pads misses critical wear information and can compromise braking performance. Skipping post-overhaul testing leaves uncertainty about system readiness. Focusing only on software updates ignores hardware, fluid, and sensor integrity that are essential for safe operation.