OH-58 A/C EP's For BWS

  1. Autorotation
    Defined as adjusting the flight controls as necessary to establish and autorotational decent and landing.
  2. Emergency Shut Down
    • Throttle - Close
    • Fuel Shutoff Valve Handle - Off
    • Bat Switch - Off
  3. Engine Failure at a Hover
  4. Engine Failure Low Altitude/Low Airspeed or Cruise
    • Autorotate
    • EMER Shutdown - Accomplish during decent if time permits
  5. Engine Compressor Stall
    • Collective - Reduce
    • Engine DEICE & HTR Switches - Off
    • Land as Soon as Possible
  6. Engine Overspeed
    • Collective - Increase
    • Throttle - Adjust
    • Land as Soon as Possible

    • If RPM cannot be controlled manually:
    • Autorotate - when over a safe landing area
    • EMER Shutdown - accomplish during descent if time permits
  7. Engine Underspeed
    • Land as Soon as Possible
    • An engine Underspeed below 94% N2 results in rotor RPM decay below minimum safe limits. Should this Occur:
    • Autorotate - When Over a Safe Landing Area
    • EMER Shutdown - Accomplish During Descent if Time Permits
  8. Engine Surges
    • GOV RPM Switch - INCR for maximum RPM
    • Throttle - Adjust to 98% N2
    • Land as Soon as Possible

    • If Surges Cannot be Controlled
    • Autorotate - when over a safe landing area
    • EMER Shutdown - Accomplish during Descent if Time Permits
  9. Complete Loss of Tail Rotor Thrust - Warning
    WARNING - Degree of sideslip maybe varied by throttle and/or collective (At airspeeds below 40 knots in pwered flight may become uncontrollable and the helicopter will begin to spin on the vertical axis. Autorotation may be the only option.)
  10. Complete Loss of Tail Rotor Thrust (Break in Drivetrain)
    • S - (If Safe Landing Area is not Available.) Fly to a safe landing area at or above Min Rate of Descent.
    • T - Autorotate with Throttle Closed.
    • A - During Autorotation descent maintain Airspeed Above Min Rate of Descent.
    • R - If Run-on (Autorotational) Landing is Possible Complete normal Autorotation with Touchdown Airspeed as Required for Directional Control.
    • 75 - (Minimum Ground Speed) If Run-On (Autorotational) Landing is not Possible start to decelerate at approx. 75ft, ground speed minimum at approx. 10 - 20 feet and just prior to ground contact Touchdown with: a rapid collective pull in a level attitude with Min Ground Run.
  11. Loss of Tail Rotor Effectiveness (LTE)
    LTE is the occurrence of an uncommanded and rapid right yaw rate which does not subside of its own accord and if not quickly reacted to, can result in a loss of Aircraft control.
  12. Loss of Tail Rotor Effectiveness (LTE) - Wind Regions
    Weathercock (120o- 240o) - Aircraft will weathervane into wind. A/C will make slow left & right uncommanded yaws. The right raw can develop into LTE and requires immediate corrective action by the pilot.

    Vortex Ring State (210o - 330o) - Develops around T/R which causes T/R thrust variations. The Helicopter will make uncommanded pitch, roll & yaw excursion. Work load will be high and it will be impossible to maintain precise heading control.

    Disk Vortex State (280o - 300o) - (Winds 10 to 30 knots) will cause main rotor tip vortices to be directed into the T/R. The T/R will operate in an extremely turbulent environment & can make a sudden uncommanded right yaw.
  13. Loss of Tail Rotor Effectiveness (LTE) - EP
    • (Simultaneously)
    • 1. Pedal - Full Left
    • 2. Cyclic - Forward
    • 3. As recovery is affected, adjust the flight controls for normal flight.
    • WARNING- Collective Reduction will aid in arresting the yaw rate; however if a rate of descent has been established, collective reduction may increase the rate of descent to an excessive value. The resultant large & rapid increase in collective to prevent ground or obstacle contact may further increase the yaw rate, decrease the rotor RPM and cause an O/TQ and/or O/Temp condition. Therefore, the decision to reduce the collective must be based on the pilots assessment of the altitude available for recovery.
    • 4. If spin cannot be stopped and crash is imminent, an Autorotation may be the best course of action. Maintain full left pedal until the spin stops, then adjust to maintain heading.
  14. Main Drive Shaft Failure
    (A transient overspeed of N1 & N2 may occur, but will stabilize.)

    • WARNING:
    • 1. Engine must remain in operation to provide power to the T/R.
    • 2. Failure to maintain engine power will result in loss of A/C control during the Autorotation.
    • 3. Adjust the throttle as required to maintain Engine RPM within normal limits.

    • If failure Occurs:
    • Autorotate - Establish a Power on Autorotation
    • EMER Shutdown - Accomplish after Landing
  15. Landing in Trees
    • Landing in trees should be made when no other landing area is available.
    • Select and area with least number of trees of minimum height.

    • Autorotation with Throttle Closed:
    • Airspeed - Minimum at treetop level
    • Descend - Vertically into trees
    • Collective - Apply remaining collective prior to blades entering trees.
Card Set
OH-58 A/C EP's For BWS
OH-58 A/C EP's For BWS