App Credits

	CONTACT INFO
	Phone Number +966 50 432 1097	Emial ID captaineer@rawaha.com	Tiktok FPX.VS
	Linkedin Profile linkedin.com/in/rawaha	Twitter @Engieerrawaha	Instagram FPX.VS

ABOUT

Captain / Rawaha Saria Alkhatib is a veteran Airline Captain with 28 years of experience, and more than 12500 hours under his belt of flying a wide variety of Aircraft, between A300-600, B747-C (SP, 100, 200 & 300), MD-90, A318, A320, A321 & A330-300. Over the years, Captain Alkhatib has worked in the capacity of IOE Check Airman, where he trained Initial cadet Pilots (First Officers), Initial Command Pilots (Captains), Transition Pilots & Direct hire Pilots, which kept his flying skills and experience growing and maturing with the growth of the industry. Since his early years of experience as an initial First Officer, one day on a normal training day, his Instructor Pilot (IP) dimmed both FMSs and asked him to continue the flight from cruise to landing using manual calculations for TOD and descent profile without relying on the FMS predictions but rather by using rules of thumb methods and applying the inputs directly on the FCU (Flight Control Unit) panel. Since that day, Captain Alkhatib has decided to crack all rules of thumb related to vertical and lateral profiles and got onboard a quest for the theory behind all these numbers and rules. Captain Alkhatib holds a bachelor’s degree in Computer Engineering (BS. Computer Engineering) which allowed him to deal with numbers rather easily and with no limitations, and with years of maths study of profiles and gradients and many other variables in the Cartesian plane, he managed to find the maths behind all rules of thumb used in this regard, and among many other variables, he came up with “Rawaha’s Golden Formula” (RGF) that summed up the relation between Altitude, Ground Speed , Distance & Vertical Speeds in ONE Formula, he also summed up the relationship between Gradients and Flight Path Angles (FPAs) in a practical use for pilots that wish to take control of their vertical profile rather than depending on onboard Flight Management Systems (FMSs) and their predictions. In this Application (FPX), the Pilot can have authority and control over the Aircraft Vertical Profile in the Airspace on the Y-axis and the X-axis as well. With FPX, the Pilot can control the Tilt (Angle/Gradient) at which he desires to fly his Aircraft on the Vertical plane, it’s user friendly and applicable to big Jets just as much as it is to the small Single Engines. FPX is the prototype of such use of profiles, Vertical and lateral, with the potential of many add-on’s to come, such as weather diversions (Off Route) navigations, RGF, Profile Fuel Efficiency (PFE), etc… FPX has been demonstrated in real time flights many times over many years in different scenarios during climbs and descents, which returned outstanding results, however, it must be used with care and vigilance, Pilots must not rely on it solely until they have perfected using it and have completely understood its application. FPX is considered Continuous Descent Operation (CDO), which is the future of Vertical Profiles for many reasons, Fuel Consumption, maximum Cruise time, minimum time in crossing flight levels through out the descent, convenience to ATC for not having to Step-Descend, and more. Therefore, FPX results in mostly Power-Off descent (Idle Descent), meaning that the pilot might sometimes (especially for big jets) have to intermittently use Speed Brakes to hold the Speed from increasing and to slow down for configuring the Aircraft for Approach and Landing while maintaining a constant descent Gradient, this causes the Aircraft to change its Tilt slightly, which might alter the Gradient slightly, about 0.1 degree, almost 10.6 FT/NM. Mind you that when you fly a constant Gradient, you fly a trajectory of the Aircraft in relation to the Ground; and when you fly Vertical Speed throughout the descent, you fly a trajectory of the Aircraft in relation to the Air, and that’s the reason why you must update the Ground Seed in FPX in order to get the proper Vertical Speed required for any proposed Vertical Profile. Last but not least, FPX is a masterpiece that must be handled with care. At high Altitudes and high Ground Speed, plan for a shallower Tilt (between 2.5 & 2.7 degrees), Smaller Aircraft and Lower Ground Speeds can plan for Tilts of 3 degrees up to 4 degrees, depending on their Ground Speeds. Enjoy the FPX and always keep safety 1st, when ever you feel lost in your vertical plane, revert to Open or Managed Descent, then re-Calculate your profile and act promptly and accordingly.

Regards; Captain / Rawaha Saria Alkhatib