The McDonnell Douglas/Boeing C-17 Globemaster III is a large military transport aircraft that was developed for the United States Air Force (USAF) from the 1980s to the early 1990s by McDonnell Douglas. The C-17 carries forward the name of two previous piston-engined military cargo aircraft, the Douglas C-74 Globemaster and the Douglas C-124 Globemaster II.
The C-17 is based upon the YC-15, a smaller prototype airlifter designed during the 1970s. It was designed to replace the Lockheed C-141 Starlifter, and also fulfil some of the duties of the Lockheed C-5 Galaxy. Compared to the YC-15, the redesigned airlifter differed in having swept wings, increased size, and more powerful engines. Development was protracted by a series of design issues, causing the company to incur a loss of nearly US$1.5 billion on the program's development phase. On 15 September 1991, roughly one year behind schedule, the first C-17 performed its maiden flight. The C-17 formally entered USAF service on 17 January 1995. Boeing, which merged with McDonnell Douglas in 1997, continued to manufacture the C-17 for almost two decades. The final C-17 was completed at the Long Beach, California plant and flown on 29 November 2015.
The C-17 commonly performs tactical and strategic airlift missions, transporting troops and cargo throughout the world; additional roles include medical evacuation and airdrop duties. The transport is in service with the USAF along with air arms of India, the United Kingdom, Australia, Canada, Qatar, the United Arab Emirates, Kuwait, and the Europe-based multilateral organization Heavy Airlift Wing. The type played a key logistical role during both Operation Enduring Freedom in Afghanistan and Operation Iraqi Freedom in Iraq, as well as in providing humanitarian aid in the aftermath of various natural disasters, including the 2010 Haiti earthquake and the 2011 Sindh floods.
RELEASE NOTES:-
Note - i am not supporting the JSBSIM version.
V3.1
Both versions:-
Updated sound pack + MP Sound.
YASIM version
Updated FDM using YASIM CURRENT VERSION suitable for FG V3.2+
Updated Payload options ( requires  FGUK pauload pack V1.6 or better )
MP cre positions ( Co pilot + Loadmaster - passenger mpad only )
Payload now viewable over MP
V3.0
New Sound pack.
Brand new cargo bay.
New lighting pack
New payload options- Requires the updated FGUK payloads package V1.5 or better ( YASIM only )
Engine Start/Stop sequence ( Yasim Only )
Removed the A340 dependency and auto start.
Flare launch system.
Changed the Cargo ramp animation.
V2.9.5
Fixed livery selection for MAC OS and FG V2.8
Fixed multiplayer gear animation.
V2.9
*** DELETE PREVIOUS VERSIONS BEFORE USE ***
Reworked the sound file.
Bug fixed the Multiplayer sound for FG 2.8+
Converted all liveries to JPEG to reduce size. Please see the Liveries README contained in the archive bfore creating new liveries. This also removes te x-ray issues the C17 previously had.
Added a Rembrandt version of the C17 to the aircraft list.
V2.8
Added MP sound for FG V2.8+
V2.7
This update is an attempt to reduce the file size of the download.
V2.6
Some cockpit instrumentation fitted. to turn on the Glass cockpit, use the Autostart function in the C17 menu ( its not linked to the engines yet ).
The Autopilot panel does interface with the Autopilot and also the f11 autopilot dialogue box.
I put a simple interior in the Cargo bay to cover the roughness of its standard interior. Perhaps someone with better skills can improve on what I have done.
You can now add payload to the C17 and see the payload in the cargo bay if you use the loadmasters view. The payload weight does affect flight performance.
Added the HUD Glass to to cockpit and a new hud to go with with it.
All new paratrooper model ( uses the same chute animation though ) Use Ctrl-J to start them jumping