hookup personnel will wear goggles and protective
headgear (hard hat/steel helmet) or flight helmet.
External Load Descriptions on CH-47
The M561 loads are rigged for external transport with
Always assume that a charge of
and without the lockout truss kit installed 4-2 between
the tractor and carrier. Descriptions of the loads and
slings used are as follows:
helicopter. Use of some type of
discharge apparatus (fig 4-1, TM 55-
450-19) to ground the hook and
a. Load 1-External Air Transport of the M561
discharge electricity is necessary to
Without Lockout Truss Kit, Using 15,000-PoundCapacity
prevent shock when the hook is
Multileg (Chainleg) Sling Set.
After discharge of
b. Load 2-External Air Transport of the M561 With
Lockout Truss Kit, Using 15,000-PoundCapacity Multileg
quickly and firmly and held, if
(Chainleg) Sling Set.
possible, until the hookup is
c. Load 3-External Air Transport of the M561
completed. If contact with the hook
Without Lockout Truss Kit, Using Aerial Delivery Cargo
is lost after initial grounded again
before it is touched. Do not use the
d. Load 4-External Air Transport of the M561 With
M561 as X ground contact. After air
Lockout Truss Kit, Using Aerial Delivery Cargo
delivery and before handling, again
ground the load to discharge any
e. Load 5-External Air Transport of the M561
Without Lockout Truss Kit, Using Universal Cargo Sling
f. Load 6-External Air Transport of the M561 With
Lockout Truss Kit, Using Universal Cargo Sling Set.
Caution should be exercised in
g. Load 7-Internal Air Transport of the M561
transporting external cargo, as flight
Without Lockout Truss Kit in US Army CH-47
may be affected by size, weight, and
shape of the cargo load.
h. Load 8-Internal Air Transport of the M561
recommended airspeed with each
Without Lockout Truss Kit in US Army CH-54 Helicopter
load is between 70 and 80 knots
depending on the weight of the load.
Higher speeds cause load instability.
4-8. Load 1-External Air Transport of the M561
Without Lockout Truss Kit, Using 15,000-Pound-
Capacity Multileg (Chainleg) Sling Set (Fig 4-1)
The lockout truss when installed
between the tractor and carrier
(1) Two-inch pressure-sensitive tape (FSN
immobilizes the tractor and carrier by
8135-558-5016), as required.
direction thereby insuring protection
(chainleg) sling set (FSN 1670-902-3080).
to the articulation system when the
(3) 550-pound-capacity nylon cord, natural,
vehicle is being lifted at the lifting
type-III (FSN 4020-240-2146), as required.
(1) Two men can rig the load in 20 minutes.
The hookup team must stand on the
(2) Two men can derig the load in 10
M561 to grasp the helicopter cargo
hook and place the 10-inch sling on
c. Rigging procedures.
Positive control and
(1) Attach one chain to each of the lifting
points of the vehicle and hook link number 5 (counted
accomplish hookup and to insure
from webbing) in the grab link.
that the pilot allows time for the
(2) Cluster and tape sling legs (breakaway
hookup team to clear the M561
technique) to prevent fouling during lift-off.