4504113A - UTC Aerospace APU APS 500R T-62T40C14 for ERJ Regional Aircraft

4504113A – UTC Aerospace APU APS 500R (T-62T-40C14) for ERJ Regional Aircraft

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Overview

The UTC Aerospace 4504113A is a flight-critical, OEM Auxiliary Power Unit (APU), the factory-specified model APS 500R (military designation T-62T-40C14) for the Embraer ERJ 135, 140, and 145 family of regional jets. This is not just a backup generator; it is a compact, single-shaft gas turbine engine designed to provide the aircraft with complete self-sufficiency on the ground. The APS 500R supplies the essential electrical power and high-pressure pneumatic (bleed) air required for cockpit procedures, cabin air conditioning, and, most critically, main engine starting.

Manufactured by Sundstrand Power Systems (now part of Collins Aerospace, formerly UTC Aerospace Systems), this APU is a benchmark for reliability in the regional airline sector. Its integrity and performance are fundamental to the dispatch reliability and operational flexibility of thousands of ERJ aircraft in daily service worldwide.

Key Features

• Single-Shaft Gas Turbine Design: Features a robust and reliable single-shaft design where the compressor and turbine sections rotate on a common shaft at a constant high RPM. This simple, effective design provides a stable source of power and bleed air.

• Dual-Function Power Generation: The APU drives two primary accessories via its high-speed gearbox:

  1. A generator to produce AC electrical power for the aircraft's main electrical busses.

  2. A load compressor to provide high-volume pneumatic bleed air.

     
     

     
     

• Independent Ground Operations: Enables the aircraft to operate all electrical and air conditioning systems on the ground without being connected to a Ground Power Unit (GPU) or Air Start Unit (ASU). This is essential for operations at airports with limited ground support infrastructure.

• Main Engine Start Capability: The high-pressure bleed air produced by the APU is directed to the air turbine starters on the main engines (Rolls-Royce AE 3007), providing the rotational force needed to start them.

• FADEC Controlled: Managed by a Full Authority Digital Engine Control (FADEC) or Electronic Control Unit (ECU). This computer system optimizes the APU's performance, monitoring and adjusting fuel flow and bleed air output to ensure efficient operation and to protect the engine from exceeding its operational limits.

  
  

  
  

Technical Specifications

• Part Number: 4504113A

• APU Model: APS 500R / T-62T-40C14

• OEM Manufacturer: Sundstrand Power Systems / UTC / Collins Aerospace

• Component Type: Single-Shaft Gas Turbine Auxiliary Power Unit

• Primary Function: Provides electrical power and pneumatic bleed air.

• Electrical Output: Drives a generator to produce AC electrical power (e.g., 30 kVA, 115/200V, 400Hz).

• Pneumatic Output: Provides high-pressure bleed air for main engine starting and the Environmental Control System (ECS).

• Fuel Source: Draws from the aircraft's main fuel tanks.

• Certification: FAA / EASA Production Approval

Aircraft Compatibility

The APS 500R is the specifically designed and certified APU for the highly successful Embraer ERJ 145 family of regional jetliners.

• Primary Aircraft Platforms:

  • Embraer ERJ 135

  • Embraer ERJ 140

  • Embraer ERJ 145

  • Embraer Legacy 600/650 (which are based on the ERJ 135 platform)

Applications

The APU is a critical system for airline operations:

• Ground Power: Powers all aircraft systems on the ground, including cockpit setup, lighting, and galley services, without the noise and fuel burn of the main engines.

• Cabin Comfort: Provides bleed air to the air conditioning packs, ensuring passenger and crew comfort during boarding and ground delays in all climates.

• Engine Starting: The sole onboard source of pneumatic power for starting the main engines, making the aircraft fully independent.

• In-Flight Backup: Can serve as a source of backup electrical power and bleed air in certain non-normal flight scenarios.

Why Choose a 4504113A?

The dispatch reliability of a regional jetliner is directly tied to the health of its APU. An inoperative APU can lead to significant departure delays, require costly ground support equipment, and limit the number of airports the aircraft can operate from. Using a genuine OEM or certified overhauled APS 500R is the only way to ensure the unit has the performance, reliability, and safety features specified by the aircraft manufacturer. For a system this integral to the aircraft's entire operation, there is no substitute for a fully certified and traceable APU.

The APS 500R (T-62T-40C14) is a constant speed APU. Its single shaft, containing both the gas generator's compressor/turbine and the load compressor, rotates at a constant, high RPM (e.g., >60,000 RPM) anytime the unit is running. This is essential because the main AC generator it drives must be turned at a constant speed to produce a stable 400 Hz electrical frequency required by the aircraft's systems. The pneumatic output is modulated by an inlet guide vane system on the load compressor. The FADEC/ECU adjusts these vanes to control the amount of air being compressed and delivered as bleed air, meeting the demands of the environmental control system or engine starters without changing the APU's core rotational speed.

Note: This is a complete turbine engine and a flight-critical aircraft system. Installation, removal, and all maintenance actions must be performed by certified AME or A&P mechanics holding the appropriate ratings and in strict accordance with the current Embraer maintenance manuals. All work must be properly documented in the aircraft's and engine's permanent records.