The Airbus Helicopters EC135 / H135 is a lightweight five/seven seat twin-turbine-engine multi-role helicopter with a radius of 720 km.
The EC135 is offered with either Safran Helicopter Engines (former: Turbomeca) Arrius 2B2 or Pratt & Whitney PW206B2 engines.
Development of the Eurocopter EC135 started in the 80s as the MBB Bo.108 Advanced Technology Helicopter. The prototype BO108 with
conventional tail rotor flew first on 15 October 1988. When the helicopter divisions of MBB from Germany and Aérospatiale from
France merged in January 1992 to form the Eurocopter Group, the Bo108 program was transferred as well. An advanced low noise ducted
10-blade Fenestron tail rotor was, next to other modifications, incorporated into the design and the name of the helicopter was
changed into Eurocopter EC135. The prototype of the EC135 (D-HBOX s/n S-01) flew first on 15 February 1994 and went in series
production in 1996 at Donauwörth. On 14 June 1996, the German certification was granted by the LBA and the first customer delivery
followed on 31 July that year. Next to the EC135 a special military version was developed designated the Eurocopter EC635. The
EC635 has a structural reinforcement of cabin structure and can be equipped with wire-guided, laser-guided, autonomous missiles. Over
1300 EC135 / H135 / H135M airframes have been delivered since the helicopter entered service in 1996. In March 2015, Airbus Helicopters
renamed its entire product line to better reflect its closer allignment with ist parent company and simplify the naming convention for
the portfolio. Therefore, the EC135 T3/P3 were renamed as “H135” as stated in revison No.EASA.R.009 Issue: 07 of the Type Certificate
Data Sheet for EC135 dated 18 March 2015. “H135M” is used as marketing designation for the military EC635 P3(CPDS); EC635 P3H; EC635 T3(CPDS)
and EC635 T3H helicopters. The ICAO Aircraft Type Designator for the EC135 / H135 helicopters is EC35.
As a result of the merger between the Eurocopter parents Aérospatiale-Matra; DaimlerChrysler Aerospace (DASA)
and Construcciones Aeronàuticas Sociedad Anonima (CASA) in July 2000, the Eurocopter group became a division of the new formed
EADS (European Aeronautic Defence and Space company). Taking off into 2014, EADS was rebranded as "Airbus Group". Uniting
all its activities under a single brand, its helicopter division Eurocopter was rebranded as Airbus Helicopters on 8 January 2014.
RTH (Rettungstransporthubschrauber) Eurocopter EC135 P2 D-HBLN "Christoph 31" of ADAC-Luftrettung GmbH was
seen at the helipad of the ADAC-Luftrettungszentrum Berlin in Germany. The call sign "Christoph" is used for the German
lifeliner helicopters since 1970 and is derived of Saint Christophorus, the Patron Saint for all travellers. The RTH facilities at the
Universitätsklinikum Benjamin Franklin, Berlin, were opened on 1 September 1987. Today this location, located in Steglitz, is known as
Charité Berlin - Campus Benjamin Franklin. The ADAC-Luftrettung helicopter in service as "Christoph 31" was the
MBB BO.105 until the type was replaced by the EC135 on 14 November 2001. Today, Eurocopter EC135 P2 D-HBLN of ADAC-Luftrettung GmbH
is operated as "Christoph 31". The 2001-built Eurocopter EC135 P2 c/n 0192 was registered D-HBLN with ADAC Luftrettung GmbH on
28 September 2001. The aircraft was fitted with the new Inlet Barrier Filter (IBF) by the ALT in Bonn Hangelar during May 2011. Over the
years, ADAC operated the EC135 P2 D-HBLN on several stations, like "Christoph 6; 20; 25; ;31; 35 and 48". Since 2017, the helicopter
is operated as "Christoph 31".