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Fuel Tank Trolley P/N 99556-100: A Complete Solution for Aircraft Fuel System Integrity Testing

  • Writer: ADMIN
    ADMIN
  • Jul 14
  • 4 min read

Overview:

The Aircraft Fuel Tank Test Trolley P/N 99556-100 is a precision-engineered, electrically powered unit designed for rigorous leak detection in both internal and external aircraft fuel tanks. Manufactured by Hydraulics International Inc., this system leverages vacuum and pressure testing methods to verify the integrity of aircraft fuel tanks under real-world conditions.

Equipped with oil/water separators, dual PSI outlets, integrated heaters, and vacuum blower units, this fuel tank trolley supports MRO operations with safety, reliability, and efficiency in mind. Whether you’re servicing narrow-body commercial jets or wide-body military aircraft, the P/N 99556-100 offers everything needed to maintain compliance with aviation standards while ensuring maximum fuel system performance.

Fuel Tank test Trolley

1. Understanding Fuel Tank Trolley P/N 99556-100: What Does It Do?



The Aircraft Fuel Tank Test Trolley (P/N 99556-100) is a mobile, electrically powered test unit specifically designed to verify the integrity of aircraft fuel tanks. It performs both pressure and vacuum testing to detect leaks in internal and external tank systems. The trolley replicates fuel delivery conditions and validates the sealing performance of fuel components, from tanks to vent lines and quantity sensors. This system is essential during post-maintenance inspections, fuel leak troubleshooting, and routine airworthiness checks.


2. Why Fuel Tank Integrity Testing Matters in Aviation Maintenance

In the aviation industry, fuel system integrity is non-negotiable. Undetected fuel leaks can lead to fire hazards, environmental violations, and system malfunctions. As aircraft structures age, the chances of micro-cracks, deteriorated seals, or faulty sensors increase—making fuel tank trolley testing a mandatory part of scheduled maintenance and compliance procedures.

Pressure and vacuum tests help identify potential issues before they escalate into safety concerns. Airlines and MROs rely on equipment like the P/N 99556-100 to meet safety regulations, minimize downtime, and ensure aircraft remain compliant with OEM and aviation authority standards.

Aircraft Fuel tank test cart

3. Core Features and Functions of the 99556-100 Fuel Tank Trolley


The Fuel Tank Trolley P/N 99556-100 is engineered for flexibility, reliability, and ease of use. It incorporates all necessary functions to simulate tank conditions, detect pressure changes, and assess leakage risk. Its core features include:

  • Vacuum Pump Motor – 1/2 HP motor with manual reset.

  • Heater Unit – 3KW capacity with indicator lamps for "on" and "running" status.

  • Motor Blower – 1 HP single-phase for air circulation.

  • Auxiliary Ports – Dual 0–100 PSI outlets to support multi-system configurations.

  • Hose & Pipe Network – Includes a 2” x 25-foot outlet hose and 60 feet of 1/2” piping for extended reach.

  • Filter Separator – Integrated oil/water filter with auto drain for system protection.

  • Drum Cover Unit – Comes with accessories for enhanced sealing and test readiness.

This configuration ensures comprehensive testing capability in both civil and military aircraft applications.


4. Built for the Hangar: Design and Mobility Advantages


The P/N 99556-100 is more than just a technical asset—it’s designed for rugged use and hangar mobility. The trolley is built on a steel-painted enclosure with caster-type wheels—two rigid and two swivel units with brakes—for safe and easy maneuvering.

Its design includes:

  • A 50-foot power cable (custom voltage selectable)

  • An ample storage compartment for accessories and hose management

  • A built-in type BC fire extinguisher for safety compliance

  • Combination lifting/tiedown points to simplify transport and positioning

This robust structure makes the trolley ideal for operational environments that require frequent repositioning and dependable hardware.

Aircraft Fuel tank test trolly

5. Inside the System: Key Components and Technical Capabilities


Every component in the Fuel Tank Trolley P/N 99556-100 serves a critical function in ensuring precise, repeatable fuel system testing:

  • 2” BSP Port Outlet – Standardized outlet for easy hose connectivity.

  • Thermocouple-Equipped 2” Air Hose – Ensures accurate temperature monitoring during testing.

  • Indicator Lamps – Clearly display operational status of vacuum, blower, and heater subsystems.

  • External Air Supply Integration – Requires <100 PSI external air to operate, making it adaptable to standard shop equipment.

This integration of components allows the trolley to simulate realistic conditions while ensuring safety, thermal regulation, and consistent test quality.


6. Operational Efficiency and Safety Features Explained


Efficiency and safety are built into every part of the P/N 99556-100 fuel tank trolley. The auto-drain feature of the oil/water filter minimizes manual maintenance. Reset mechanisms on the vacuum motor prevent accidental overload. Clear visual indicators reduce user error during high-risk testing procedures.

The 3KW heater unit allows thermal expansion testing, a critical step in identifying leaks that may only appear under elevated temperatures. All control systems are accessible, intuitive, and labeled—ideal for MRO teams needing fast deployment and consistent results.


7. AVA AERO & HII Fuel Tank Trolley Solutions: Reliable Support and Supply


As the exclusive regional representative for Hydraulics International Inc. (HII), AVA AERO offers full sales, support, and logistics for the P/N 99556-100 fuel tank trolley. Our team can assist with:

  • Local supply and delivery across the Middle East

  • On-site product demonstrations and training

  • Maintenance and technical support services

  • Integration into broader GSE and MRO infrastructure

Whether you operate a large maintenance hangar or a compact MRO facility, AVA AERO ensures you have direct access to reliable fuel tank testing equipment and the expertise needed to keep your fleet safe, compliant, and efficient.


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