determination of equivalent safety for instrument flight  below V$_{MINI}$ and the minimum helicopter requirements  are specified in Advisory Circulars (AC) 27-1, Certification  of Normal Category Rotorcraft and AC 29-2, Certification  of Transport Category Rotorcraft. Application guidance is  available from the Rotorcraft Directorate Standards Staff,  ASW-110, 2601 Meacham Blvd., Fort Worth, Texas, 76137­ 4298, (817) 222-5111.  a V$_{MINI}$ of 70 KIAS may have inadequate control margins  to fly an approach that is designed with the maximum  allowable angle/descent gradient or minimum allowable  deceleration distance from the missed approach point  (MAP) to the heliport. The “Copter” PinS final approach  segment is limited to 70 KIAS since turn containment and  the deceleration distance from the MAP to the heliport may  not be adequate at faster speeds. For some helicopters,  engaging the autopilot may increase the V$_{MINI}$ to a speed  greater than 70 KIAS, or in the “go around” (G/A) mode,  require a speed faster than 70 KIAS. [Figure 7-2] It may be  possible for these helicopters to be flown manually on the  approach or on the missed approach in a mode other than  the G/A mode.  Performance data may not be available in the HFM for  speeds other than the best rate of climb speed. To meet  missed approach climb gradients, pilots may use observed  performance for similar weight, altitude, temperature, and  speed conditions to determine equivalent performance.  When missed approaches utilizing a climbing turn are  flown with an autopilot, set the heading bug on the  missed approach heading, and then at the MAP, engage  the indicated airspeed mode, followed immediately by  applying climb power and selecting the heading mode.  This is important since the autopilot roll rate and maximum  Since slower IFR approach speeds enable the helicopter  to fly steeper approaches and reduces the distance from  the heliport that is required to decelerate the helicopter,  you may want to operate your helicopter at speeds slower  than its established V$_{MINI}$. The provision to apply for a  7-4  Figure 7-2. V$_{MINI}$ limitations, maximum IFR approach angles and G/A mode speeds for selected IFR certified helicopters.  Augusta  A-109  A-109C  Bell  BH 212  BH 214ST  BH 222  BH 222B  BH 412  BH 430  Eurocopter  AS-355  AS-365  BK-117  EC-135  EC-155  Sikorsky  S-76A  S-76A  S-76B  S-76C  SK-76C++  9.0  5.0  4.0  4.5  4.5  6.0  4.6  4.0  3.5  7.5  7.5  6.5  SA MPLE NO FOR A C TU AL USE V$_{MINI }$Limitations  MAX IFR Approach Angle  G/A Mode Speed  Manufacturer  75 KIAS  75 KIAS  75 KIAS  60 (80 coupled)  40  40  70  50  50  60  50 (65 coupled)  55  75  45 (70 coupled)  60  70  60 (AFCS Phase II)  50 (AFCS Phase III)  60  60  50 (60 coupled)  NOTE: The V$_{MINI}$, MAX IFR Approach Angle and G/A Mode Speed for a specific helicopter may vary with avionics/autopilot installation.  Pilots are, therefore, cautioned to refer only to the Rotorcraft Flight Manual limitations for their specific helicopter. The maximum rate of  descent for many autopilots is 1,000 FPM.  LEGEND  In some helicopters with the autopilot engaged, the V$_{MINI}$ may increase to a speed greater than 70 KIAS, or in the “go around” mode requires a speed faster than 70 KIAS. 