In 2002 this group has absorbed the AiResearch (formerly Garrett) and Allied Signal itself has been absorbed by Honeywell in Phoenix, Arizona.

-The manufactured engines are the same. The group of auxiliary power units (APU): the GTCP 30, 36, 85, 95, 133, 165, 331 and 660 in all series. They offer such a wide range of engines that most American civilian and military aircraft are using them.

-The auxiliary power turbine 131-9 (D) is an onboard APU shown here in a masterful drawing, one of those that appear periodically in the British magazine Flight.

“Drawing of the APU 131” (PiP)

“TSCP-700”

-The TSCP 700 engines round off the APUs, or rather APPs (Auxiliary Power Plant).

-The star remains the turboprop TPE331. The version we see below is the -5 (Dash 5).

“TPE-331”

-Its success is followed by the TFE731, although it may soon surpass the previous.

-The commercial TFE731 turbofans in all its series are mainly destined to small and medium business and aerotaxi jet aircraft. Some variants are used in military training aircraft such as the CASA 101.

“TFE-731”

-The US military version of this engine is F-124-GA-101.

“F-124-GA-101”

-The small turbofan TFE-109 with 1330 lbs of thrust has dual shaft and high bypass dilution. Its military USAF designation is F-109-AG100.

“F-109”

-Another turbofan of military use is the TFE-1042 with 6,060 lbs of thrust, much more powerful than the others we have seen from this manufacturer.

-The ATF-3, that was originally developed as the F-104-GA-100, has an inverted-flow exhaust system that flows into the bypass channel from the fan after a final reverse and it remains hidden. In this way it avoids the infrared "signature" that could be detected by missiles. It has three shafts and half-step ratio.

“ATF-3”

-A surprising information appears in "Business and Commercial Aviation" that informs us about Allied Signal being involved in a program of improvement and cost reduction for various Lycoming engines such as the LTS-101 helicopter turboshafts and the LTP-101 turboprop versions, both in the order of 510/685 SHP. They are mounted in Eurocopter, Kawasaki, Aerospatiale and Bell helicopters.

-They did the same with the T-55 and T53 that were widely used on Kaman, Bell, Fuji, Boeing helicopters.

-The T-800 and CTS-800 with 1350/1560 SHP are also helicopter engines (see Lycoming). The TPF-351 is a derivative thereof.

-It can be made to rotate clockwise or counterclockwise, as it is a twin-shaft turboprop, modifying only the second shaft. Free turbine with rear transmission.

“TPF-351”

-For regional jets the company has the LF507, derived from the AS-309 as projects. More detailed information about these projects we can see in the Garrett and Honeywell chapters.

-One of the brand's last projects was the AS-900 series, such as the AS-907 and AS-977. The ES-900 was presented at Farnborough in 1998, with a different design from all the company's previous engines. It is planned to deliver 4,000/9,000 lbs of thrust.

-The RE series are the latest APUs and APPs. Here we highlight the RE-220 that was initially destined for the Gulfstream V.

“RE-220”

-From appendix A2 / 6: They acquired Garrett and then sold it to Honeywell. The APU-131-9 on the picture was in Allied Signal Aerospace at that time.

“Allied-Signal 131-9D”

-Another important APU is the 36-300 that was used in the Boeing 737, MD-80 and A.320.

“APU 36-300”

“Logo ASA”

-It was not possible to include any illustration of the AS-900 in the main text for not having it. Now we have received a picture of this engine from 1999.

-It delivers 7,500/8,000 lbs of thrust and it is bound for regional or business aircraft.

“AS-900”

-There was a project for a regional aircraft small size APU, the RE-220.

“Allied Signal RE-220”

-Another turbine engine that was adapted for K650T plane is in Honeywell now. It gave 740/840 hp and was installed in the Sherpa, also known as "The Beast" of experimental aircraft.

“The beast”

“TPE331-5 mounted in the K650T”

Note from the Author: As suspected, although this engine appears in publications translated to Spanish, it has proved to be a Garrett TPE-331-5, just as we are able to see here. The K650T model is the aircraft, like for the K300 it has been the same with the Lycoming IO-720 piston engine.