The Auxiliary Power Unit (APU) for the Boeing 747-400 (B744) is an essential component for providing electrical power, air conditioning, and engine starting capabilities when the aircraft is on the ground and the engines are not running. Over time, the APU may require servicing, refurbishment, or even replacement with a new or overhauled unit.
PW901A/C
Our PW901C APU is a twoshaft gas turbine engine, originally derived from a Pratt & Whitney turbofan engine used in popular business jets. It provides power for the Boeing 747-8 and its predecessor, the PW901A-powered Boeing 747-400. During on-ground operation, it provides bleed air for cabin conditioning from a low spool-driven load compressor, and electrical power from two gearbox-mounted 90kVA generators.
The Boeing 747-400, including those in question here, are equipped with the Pratt & Whitney Canada PW901A Auxiliary Power Unit (APU). This APU is a two-shaft gas turbine engine designed to provide on-ground power for the aircraft. It supplies bleed air for cabin conditioning and main engine start capability, as well as electrical power from two gearbox-mounted 90kVA generators. The PW901A APU offers a 40% reduction in fuel consumption compared to previous APU designs, making it more efficient for ground operations.
The other most commonly used APU for the Boeing 747-400 is the PW901A, which provides the necessary ground power for various systems in the aircraft.
Cost Breakdown for APU (New and Refurbished) for Boeing 747-400
1. Cost of New APU
- A brand-new APU for the Boeing 747-400 can be quite expensive due to its complexity and the manufacturing process.
- The estimated cost for a new GTCP 331-500 APU typically ranges from:
- $1.5 million to $3 million.
- This price includes the APU unit itself and may include any initial warranty or factory certification.
- Lead time for a new APU can also vary, typically taking several months depending on the supplier and demand.
2. Cost of Refurbished or Overhauled APU
- Refurbished or overhauled APUs are often a more cost-effective option compared to buying new.
- Overhaul programs are available where used APUs are disassembled, inspected, repaired, and restored to meet OEM specifications.
- The cost of a refurbished or overhauled APU for the Boeing 747-400 typically falls in the range of:
- $700,000 to $1.5 million.
- This price will vary depending on the APU’s age, the extent of refurbishment or overhaul required, and the provider’s capabilities.
3. Cost of APU Overhaul (Complete Overhaul)
- If you have an existing APU and want to send it for an overhaul, the cost will generally be lower than purchasing a refurbished APU.
- The cost of a complete APU overhaul can range from:
- $500,000 to $1 million.
- Overhaul includes complete inspection, replacement of worn parts, and bringing the unit back to factory specifications.
4. Labor and Installation Costs
- Labor costs for the installation of a new or refurbished APU will depend on the location of the maintenance provider and the complexity of the installation.
- The labor cost for installation generally ranges from:
- $20,000 to $50,000.
- This may include disassembly, inspection, installation, and testing of the new or overhauled APU.
5. Additional Inspection and Testing
- After installation or refurbishment, the APU will need to be thoroughly inspected and tested to ensure proper function.
- The cost of inspections and testing for the APU typically ranges from:
- $10,000 to $30,000, depending on the specific maintenance provider and the level of testing required.
Total Estimated Costs for APU (New and Refurbished) for Boeing 747-400
| Cost Component | Estimated Cost |
| New APU (GTCP 331-500) | $1.5 million – $3 million |
| Refurbished/Overhauled APU | $700,000 – $1.5 million |
| Complete APU Overhaul | $500,000 – $1 million |
| Labor for Installation | $20,000 – $50,000 |
| Inspection and Testing | $10,000 – $30,000 |
| Total Estimated Cost | $530,000 – $3.08 million |
Key Factors Affecting APU Costs
- New vs. Refurbished/Overhauled APU: A new APU is significantly more expensive than a refurbished or overhauled unit. The latter is often chosen for budget-conscious operators, as it provides a nearly equivalent performance at a lower cost.
- Supplier: Prices can vary based on the supplier and whether you’re purchasing directly from the OEM (e.g., Hamilton Sundstrand) or from a third-party MRO provider.
- Condition of the APU: The cost of a refurbished or overhauled APU depends on how much work is required to bring the unit back to serviceable condition. Overhauls usually involve more extensive work, which can increase costs.
- Location: Labor rates and overhead costs may differ depending on the location of the MRO facility performing the installation or overhaul, which can influence the overall cost.
Conclusion
The cost of an APU for the Boeing 747-400 varies significantly depending on whether you’re opting for a new or refurbished unit, or whether you’re choosing an overhaul for an existing unit.
- New APU: $1.5 million to $3 million.
- Refurbished/Overhauled APU: $700,000 to $1.5 million.
- Complete APU Overhaul: $500,000 to $1 million.
These costs exclude installation, inspection, and testing, which could add an additional $30,000 to $80,000.
PW901A/C
Our PW901C APU is a twoshaft gas turbine engine, originally derived from a Pratt & Whitney turbofan engine used in popular business jets. It provides power for the Boeing 747-8 and its predecessor, the PW901A-powered Boeing 747-400. During on-ground operation, it provides bleed air for cabin conditioning from a low spool-driven load compressor, and electrical power from two gearbox-mounted 90kVA generators.