Appendix B Land: Arms crossed and extended downward in front of the body.
Day Night Cut Engine(s): Either arm and hand level with shoulder, hand moving across throat.
Day Night B-5
Appendix B Move Hook Down or Up: Right fist held above head: left arm extended horizontally, palm faced outward, then swept down or up to indicate direction of hook movement.
Day Night Hookup: Hands raised alternately above the head in a "rope climbing" motion to take up slack.
Day Night B-6
Appendix B Move Downward: Arms extended horizontally sideways, beckoning downward, with palms turned down.
Day Night Move Upward: Ars extended horizontally sideways, beckoning upward, with palms up.
Day Night B-7
Appendix B Move Rearward: Arms by sides, palms facing forward, arms swept forward and upward repeatedly to shoulder height.
Day Night Move to Right: Left arm extended horizontally sideways in direction of movement and other arm swung overhead in same direction, in a Day repeating movement.
Night B-8
Appendix C C-1 APPENDIX C. POSSIBILITY OF D-RING REVERSAL OR DYNAMIC ROLLOUT
DURING WINCHING OR LONG LINE OPERATIONS C.1 Background.
1. Unintended disconnection between the helicopter winch hook and the primary engaging ring on the occupant’s rescue harness typically occurs during a pause in the winching sequence, when the ring in the rescue strop and the hook are temporarily relieved of the load. With no weight on the hook and ring, under the dynamic conditions of this type of operation, it becomes easy for the ring to travel up and flip over the tip of the hook and to rest on the spring-loaded keeper. The ring is now only supported by the spring-loaded keeper (see Figure C-1, Example of D-Ring Reversal).
Figure C-1. Example of D-Ring Reversal
2. W hen the winching sequence commences, the load is reapplied, and the ring opens the spring-loaded safety catch and slips off the hook and the occupant or load falls to the ground.
3. HEC rescue winch hooks with exposed hook tips, such as the MS 18027-2A, do not prevent D-ring reversal or deflect the primary engaging ring safely back into the throat of the hook (see Figure C-2, MS 18027-2A Hook).
4. HEC rescue winch hooks with manually locking keepers or guards have a hand-operated mechanical latch or keeper lock, in addition to spring pressure used to initially close the keeper. Such designs are intended to prevent partial hook
Appendix C C-2 engagement and deflect the primary engaging ring safely back into the throat of the hook, thus preventing D-ring reversal (see Figures C-3, Hook with a Mechanical Lock Latch Gate Design, and C-4, Hook with a Simple Spring-Loaded Safety Latch or Keeper).
Figure C-2. MS 18027-2A Hook MS 18027-2A Hook with simple spring-loaded safety catches. Note the exposed hook tips.
Figure C-3. Hook with a Mechanical Lock Latch Gate Design One type of hook which incorporates a mechanical lock latch gate design. The keeper also guards the tip of the hook.
Appendix C C-3 Figure C-4. Hook with a Simple Spring-Loaded Safety Latch or Keeper H ook used in a popular winch system which uses a simple spring-loaded safety latch or keeper.
C.2 Recommend Action.
1. Develop procedures which list the specific D-rings or equipment which may be attached to a specific rescue hook wherein the possibility of D-ring reversal is physically impossible.
2. Use only rescue hooks which have a mechanical locking keeper or guards to prevent ring reversal or dynamic rollout.
3. Ensure winch operational training is tailored for each helicopter type and winch combination and is completed on a regular basis.
4. Operate and maintain winches, hooks, and harnesses in accordance with approved data.
Advisory Circular Feedback Form If you find an error in this AC, have recommendations for improving it, or have suggestions for new items/subjects to be added, you may let us know by contacting the General Aviation and Commercial Division (AFS-800) at 9-AFS-800-Correspondence@faa.gov or the Flight Standards Directives Management Officer at 9-AWA-AFB-120-Directives@faa.gov.
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