DIFFERENT KIND OF LOCKS

LOCKS IN FWD AND AFT COMPARTMENT

There are 02 holds with multiple compartments in hold.

FORWARD HOLD: Compartment 1 and Compartment 2

AFT HOLD : Compartment  3 and Compartment  4

BULK compartment (aft) :  Net Section 51 and 52

Equipment installed in the floor of an aircraft cargo compartment to restrain aircraft unit load devices against the ground/flight loads.

It usually consists of such items as rollers, side guides and locks for securing unit loads devisces to the aircraft structure. It does not include unit load devices, barrier and tie down straps.

To understand the retraining of the locks and stops it is important to get familiar with the airplane axes. An airplane axis is an imaginary line running along the different directions of the airplane.

There are 3 main axes:

1- Longitudinal or X Axis which is an imaginary line FWD and AFT of the airplane.

2-  Lateral or Y Axis which is an imaginary line on the Right Hand side and left hand side.

3- Vertical or Z Axis which is an imaginary line in the upward and downward direction.

For example: If a lock is described as a XZ lockt, it means that it restrains the movement of the ULD along the X and Z Axis.

Equipment  installed in the floor of an aircraft cargo compartment to restrain aircraft unit load devices against the ground/flight loads.

It usually consists of such items as rollers, side guides and locks for securing unit load devices to the aircraft structure. It does not include unit load devices, barrier and tie-down straps.

To understand the retraining of the locks and stops it is important to get familiar with the airplane axes. An airplane axis is an imaginary line running along the different directions of the airplane.

There are 3 main axes:

1-  Longitudinal or X Axis which is an imaginary line FWD and AFT of the airplane.

2- Lateral or Y Axis which is an imaginary line on the Right Hand side and left hand side.

3- Vertical or Z Axis which is an imaginary line in the upward and downward direction.

CONVEYANCE COMPONENTS, LOCKS AND RESTRAINTS:

Conveyance Components:

Ballmats and Ball Transfer units in entrance area:

Ballmats and ball strips are installed in the forward and aft cargo door entrance area. The ballmats and strips are equippked with ball transfer units installed in a frame work. They allow multidirectional and low friction movements of ULDs in the cargo door area.

Roller tracks:

The Roller tracks are installed in longitudinal direction, used for longitudinal transport of  ULDs. The roller tracks are extruded profiles, equipped with transport rollers, end stops and XZ-latches. At certain positions, the roller tracks are additionally equipped with power drive units and proximity switches below the XZ-latches allowing powered transportation of ULDs. In these roller tracks braking rollers are also installed to prevent inadvertent ULD movement.

Power drive units:

 The power drive unit (PDU) consists of an electrical motor, a gear drice and a rubber coated roller, mounted on a rolling axle. It is used to move the ULDs in longitudinal and lateral directions.

Door Sill:

Door sill latch units are installed in the cargo door areas. Each door sill latch consists of:

·       A YZ-latch, which allos latching the ULDs postioned in the door entrance area.

·       An override able Y-latch which prevents inadvertent roll out of ULDs during loading and off-loading.

·       A guide roller which is used to transfer of ULDs between the loader and the ball mat area.

Lateral Guide Panels:

Lateral guide panels provide guidance laterally in the doorway area. These design assist with the alignment of cargo containers during the load and unload process. The lateral guides can be raised and lowered by manual operation.

XZ-latches:

The XZ-latches are used to lock the ULDs in X- and Z-direction. Depending on the cargo hold configuration single or double may be installed to accommodate any kind of ULD loading.

 End Stops:

The fixed XZ-end stops at the extremities of each cargo hold are used to loack ULDs in the X- and Z-direction.

Fixed End Load Stops:

Side restraints: These are used to restrain the movement of the ULDs in the YZ direction.

 

Partial Load stops:

These are installed in the lower deck compartments and are used to prevent the movement of ULDs towards the door area only.

Missing/Inoperable Restraints:

Unrestricted Use of ULDs

The following equipment malfunctions do not constitute loading restriction requirement.

ü Jammed or missing door sill rolles without vertical restraint.

ü Jammed or missing balls in a ball mat

ü Jammed or missing rollers in a roller unit

ü Split slide guide rail.

Restricted use of ULDs

a. Restraint systems fall into three catergories:

                    i.        Side (lateral) restraints

                  ii.        Lateral/vertical restraints

                iii.        Forward/aft restraints

b.  Each restraint direction is considered separately when restraint equipment is missing/inoperable (i.e forward, aft, side left, side right and vertical loading).

c.  When a restraint is missing/inoperable, the allowable weight is determined by considering each restraint direction separately and using the most limiting resultant allowable weight.

d. If either of the following applies, the allowable weight within the associated zone shall be 0 kg:

-      Two or more missing/inoperable restraints next to each other.

-      Two missing/inoperable restraints next to a common corner.

e. A missing/inoperable centre lateral guide is equivalent  to one missing restraint in the right lane and one missing restraint in the left lane. This shall also not be interpreted as two adjacent missing restraints.