The Bombardier Q400 turboprop is equipped with an APU, Auxiliary Power Unit. The Bombardier Q400 APU is the APS 1000 APU that was previously manufactured by Hamilton Sundstrand, a United Technologies company. Its full model name is the T-62T-46C12 APU, which is the exact model for the Bombardier Q400 turboprop. United Technologies merged Goodrich and their related aircraft parts subsidiaries into a new division called UTC Aerospace Systems. Hamilton Sundstrand was merged into the new UTC Aerospace Systems division. Now the APU is called the UTC Aerospace Systems APS 1000. The APU is mounted at the tail of the plane which is featured in the photo below (where the exhaust is).The Q400 APU is certified by the Federal Aviation Administration (FAA) under TSO-C77A Category I (Technical Standard Order C77A) TSOs are minimum standards set for the performance of certain parts, including APUs.
Bombardier Q400 APU – APS 1000 Specifications and Features
Below is information on the APS 1000.
- APU has and integral oil system with cooler, and fan.
- Full Authority Digital Electronic Control (FADEC), digitally controlled.
- Turbine Wheel Integral Tri-Hub Containment
- Compressor Wheel Tri-Hub Containment
- Connected to the Q400's on-board computer.
- Has over-speed protection
- Fault diagnostics
- High oil temperature and low oil pressure protection
Above photo copyright Hamilton Sunstrand. Used under the fair use provision.
Q400 APU Specifications:
20 SHP (67 kW) kilowatts Zero bleed
20 SHP, 80 pounds per minute bleed
57 PSIA / 3.93 bar delivery pressure
At 59 degrees F (15 C) sea level (nominal rating)
100 SHP (67 kW)
0 SHP, 80 lb/min bleed
54 PSIA / 3.72 bar delivery pressure.
At 103 F or 39 C, Sea Level (nominal rating)
Weight: 190 pounds or 86 kilograms with electronic control and starter
Max Continuous Rated Temperature:
1,300 F or 704 C EGT
Bombardier Q400 APU Dimensions:
Length: 35.88 inches x Width 24.20 inches x Height: 21.81 inches. Other publications give the following dimensions: Length 30 inches x Width: 24.5 inches x Height: 22 inches.
To find out more about the Bombardier Q400 aircraft visit the other pages here on the site.
Other Names for the Bombardier Q400 APU
There are other names for the Bombardier Q400 APU. The aircraft has other names due to changes in the name for the airplane and other names that are used for other purposes. Here are the other "names":
- Bombardier DH4 APU: "DH4" is the Q400 turboprops IATA code that is used primarily by airlines to identify the aircraft.
- Bombardier DH8D APU: "DH8D" is the ICAO code for the airplane and is used by airlines, air traffic control and others. To find our more about this name visit the DH8D page.
- De Havilland Canada DHC-8-400 APU: This is the model name for the turboprop. De Havilland was the previous division of Bombardier that built the aircraft. The De Havilland name is no longer used in marketing by Bombardier, so it is called the Bombardier DHC-8-400 APU. DHC-8-400 is the official model name for the turboprop that is used by aviation regulators to identify the aircraft.
- De Havilland Dash-8-400 APU: the Dash-8-400 name is the name that was previously given to the aircraft by Bombardier. The Q400 was apart of the Dash-8 series program of turboprops. Bombardier then decided to change the name of those aircraft to the Q series turboprops and the Dash-8-400 became the Bombardier Q400. More on the Dash-8-400 name is found on that page.