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MAINTENANCE MANUAL
RAISING PROCEDURES — SYSTEM DESCRIPTION
1. Description
A. General
It is essential that personnel engaged in raising the Gulfstream be familiar with the aircraft structure,
its limitations and the use of raising equipment.
A survey should be made to determine the structural condition of the aircraft before raising is
attempted and ensure that the raising and stabilizing points to be used can take and transfer the
loads to be imposed on them.
Lifting bags cannot be placed at areas of extensive damage. However, local damage can be bridged
to sound structure.
It is advisable, although not necessary, to defuel the aircraft, remove the cargo and purge the tanks
to lessen the possibility of additional damage and reduce the FIRE HAZARD during the raising
procedure.
Cargo that is not removed should be tied down to prevent shifting. Control surfaces should be locked
to prevent their banging against the stops. Landing gear that is extended should have ground safety
locks installed, wheels chocked and brakes released.
(1) Mechanical Lifting Equipment
This equipment can be used for hoisting with slings around fuselage.
(2) Pneumatic Lifting Bags
These bags can be placed under the fuselage and wings. Bag specifications are:
• Type F-2 MIL-B-6640A
• Length: 7 1/2 feet, Width: 6 1/2 feet
• Depth minimum: 6 inches
• Depth maximum: 6 feet
• Lifting capacity: 12 tons
• Pressure: 2 1/2 psi
Although a fully loaded Gulfstream with all landing gear up can be raised with one bag under
each wing and one bag under the fuselage, located either fore or aft, as required to level
aircraft, it is preferable to use two bags under fuselage (one forward and one aft) to prevent
tipping due to a shift of the center of gravity relative to wing bags. Where only one bag is used
under each wing, they must be placed symmetrically.
(3) Setting Up of Bags
Before bags are set in place, the ground area should be cleared of all sharp or projecting
objects. The structure to be supported and that adjacent to it, should also have all projections
and sharp edges removed or covered. Any oil or grease present should be removed.
Check air outlets to ensure that they are secure before inflating.
(4) Inflation of Bags
Bags should be inflated so as to keep the aircraft level and the lifting force vertical.
(5) Stabilizing Lines
When the aircraft is being raised with bags, stabilizing lines must be used to maintain stability in
a lateral plane. All loads are based on a factor of three to ultimate failure and a factor of two to
yield conditions. For maximum loads, see Figure 1.
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MAINTENANCE MANUAL
To attach lines, first remove filler screws, 6 in each wing, 12 in tail, from inserts and bolt line
attachments as follows: See Figure 2.
ATTACHMENT NO. BOLT TO
1159TEM20504-1 Left Wing
1159TEM20505-1 Right Wing
1159TEM20506-1 Tail
Once attachments are in place, tie on stabilizing lines and secure them to ground points.
To avoid dependence upon ground stakes which might loosen, it is recommended that the
stabilizing lines be anchored to a vehicle weighing at least 50% more than the maximum loads
for stabilizing lines, shown in Figure 1.
For tail stabilizing lines, use 9/16 inch minimum diameter manila line with a breaking strength of
3450 pounds, or equivalent 3/8 inch minimum diameter dacron line with a breaking strength of
3500 pounds.
For wing stabilizing lines, use 1/2 inch minimum diameter manila line with a breaking strength of
2650 pounds, or equivalent 5/16 inch minimum diameter dacron line with a breaking strength of
2550 pounds.
The line strengths recommended above allow for the reduction in line strength due to one round
turn and two half hitches or a fisherman’s bend. Eye splices and proper sized shackles would
provide a greater strength. Knots other than those specified will result in a reduction of line
strength. Where it is impossible to use the stabilizing locations shown, other points will have to
be chosen.
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MAINTENANCE MANUAL
Location of Lifting and Stabilizing Line Attaching Points
Figure 1
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MAINTENANCE MANUAL
Stabilizing Line Attachment Points
Figure 2
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