John, from the Raisbeck supplement re FAR 25.
ENHANCED RAISBECK TAKE-OFF AND LANDING PERFORMANCE
The aerodynamic improvements of the Raisbeck Enhanced Performance Leading Edges make available improved take-off and landing performance. Part 23 of the Federal Aviation Regulations require only the all engines operating distance over a 50-ft. height be presented for take-off distance. Along with the FAA-approved optional performance in this subsection, we include for your information Accelerate-Go, Accelerate-Stop, Climb Limited Weight, Net Climb Gradient, and other information generally tailored to FAR Part 25. For data not shown in this section, refer to Section V of the Beechcraft POH.
ALTERNATE RAISBECK BALANCED FIELD LENGTHS
There is increasing world-wide acceptance of FAR Part 25 safety standards in the smaller turboprop and turbojet Corporate and Airline fleet. Raisbeck Engineering offers its fully Raisbeck-Equipped B200 aircraft with equivalent FAR Part 25 Balanced Field Lengths, tailored to FAA Advisory Circular, AC25-7. Take-off field length requirements for flaps up and approach may be drawn from this subsection as an alternate to the standard enhanced Raisbeck takeoff performance detailed in the previous subsection.
Some of the more important FAR Part 25 requirements utilized to calculate performance in this subsection are as follows:
• Decision speed (V1) is faster than engine failure speed (VEF) by the demonstrated pilot engine-failure recognition time, plus one-second.
• If continuing take-off:
- Rotation speed (VR) must be faster than 1.05 VMCG
- Speed at 35 feet altitude (V2) must be faster than 1.2 VS
- Speed at 50 feet altitude (V50) is considerably faster than 1.2 VS
• If aborting take-off:
- Brake application may not begin until V1, (See decision speed, above)
- Throttle-chop may not begin until demonstrated pilot brake application time plus one second
- No propeller reverse of any type may be utilized to contribute to the stopping distance
The reference airspeeds for takeoff in this subsection, utilizing all the above factors have naturally increased. To compensate for this, a new Flaps approach takeoff procedure has been incorporated. Shorter take-off and Balanced Field Lengths are the end results. This allows safe operation at heavy gross weights out of previously inaccessible airports.
Following on from previous discussion I note now they say when practising Vmca a minimum of 5,000 ft and the 5° bank.