ASME B30.12 pdf download.Handling Loads Suspended From Rotorcraft.
SECTION 12-0.1: SCOPE OF B30.12
This Volume applies to the protection of flight crews, ground personnel, and property on the surface while working directly with or in the vicinity of rotorcraft conducting external load operations. Within the general scope as defined in Section I, 830.12 applies to the handling of loads suspended from rotorcraft using a cargo sling or powered hoist, or other attaching means, to lift, carry, pull. or tow a jettisonable load outside of the rotorcraft airframe.
SECTION 12-0.2: DEFINITIONS
12-0.2.1 Rotorcraft External Load Classifications
Class A Rotorcraft Exh’rnal Load: a load combination in which the external load cannot move freely, cannot be jettisoned, and does not extend below the landing gear. This category usually features multiple attachments to the airframe. A typical example is a hard-mounted cargo basket attached to the rotorcraft airframe that is used to carry cargo from points A to B (included for reference only).
Class B Rotorcraft External Load: a load combination in which the external load is jettisonable and lifted free of land or water during the rotorcraft operation. The load is typically suspended from a hook or similar device. The hook may be attached to the rotorcraft structure, or it may be attached to a movable hoist cable and the hoist itself attached to the rotorcraft. Typical use is to lift a cargo load until it is completely airborne and fly it from points A to B.
Class C Roforcraft External Load: a load combination in which the external load is jettisonable and remains in contact with land or water during rotorcraft operation. The load is typically in contact with land or water during rotorcraft operation. The load is typically partially suspended by a net, slings, or cables from a cargo hook or similar device. The cargo hook may he attached to the rotorcraft structure or a movable hoist cable and the hoist itself attached to the rotorcraft. It is typically used for stringing wire or laying cable where the load is partially suspended from the ground.
12-2.2.4 Limit Switches
The hoist or winch shall be equipped with upper and lower limit switches to control the length of the lifting member on the drum.
12-2.2.5 Breaking Strength
A combination of end attachments and wraps of rope on the drum shall be used to develop breaking strength.
12-2.2.6 Rope Marking
The length of hoist rope nearest the rope’s attachment to the hoist/winch should be visually marked to indicate to the operator that the hoist rope is near lull extension.
12-2.2.7 Rope Attachment
The hoist rope should he positively attached to the hoist/winch drum, and the attachment should meet the ultimate load capability, or equivalent means should be provided to minimize the possibility of inadvertent, complete cable unspooling.
12-2.2.8 Storage
The hoist or winch should be disabled (or an overriding, fail-safe mechanical safety device, such as a flagged, removable shear pin or load lowering brake, should be utilized) to prevent inadvertent load unspooling or release during any extended flight phase that involves HEC and in which hoist or winch operation is not intended.
SECTION 12-2.3: ROTORCRAFT
The rotorcraft shall be certified by the FAA, or applicable regulatory authority, and carry proof of same by display of the registration certificate, airworthiness certificate, and rotorcraft load combination operation and flight manual.
SECTION 12-2.4: SLINGS
Sling strengths and configurations per ASME B30.9 do not apply because of the different dynamic load conditions present in flight operations versus ground-based lifting equipment. Sling strengths should be determined by the method given in para. 12-2.4.3. However, in no case shall a design factor of less than 2.5 limit load factor be used for NHEC applications or less than a 3.0 design factor be used on the yield strength of the weakest component in the QRS, PCDS. and attachmcn for HEC applications.
12-2.4.1 Types of Stings
The types of slings considered are as follows:
(a) vertical hitch (see Fig. 3)
(b) two leg (see Fig. 4)
(C) three leg (see Fig. 5).
ASME B30.12 pdf download
