777 AMM 飞机维护手册 Equipment and Furnishings(29)

Purpose
Pallet locks give longitudinal and vertical restraint for pallets and pallet sized containers, LD-7 and LD-11.
Location
Pallet locks are in the forward cargo compartment only.
Most pallet locks mount to the roller trays and some mount to floor structure. Some pallet locks may be part of a stop/lock unit.
The locks mount to the four roller trays that parallel the longitudinal PDUs.
The floor structure mounted locks are in the area of the aft ball panels.
The locks are in rows, each row in the forward cargo compartment has four locks.
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CARGO HANDLING SYSTEM -PALLET LOCK -INTRODUCTION

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CARGO HANDLING SYSTEM -PALLET LOCK -OPERATION

Physical Description
All pallet locks are spring-loaded mechanical units. There are seven similar types of pallet locks (not all shown). More than one type is necessary because of mounting and space limits. Some pallet locks have parts that let them restrain only one pallet. Others have parts that let them restrain two pallets.
Pallet locks have these parts:
*
Lockhead(s)

*
Anchor fitting (not all locks)

*
Base

*
Pawl (double pallet locks)

*
Link (single pallet locks)

*
Springs (not shown).

Double Pallet Lock Operation
You manually put the lockhead up to restrain pallets. The lockhead is spring loaded to down so you must lift the lockheads until the pawl locks the lockheads in the LOCK position.
You manually put down the lockheads to unload cargo. The lockheads will go down on there own when you pull the upper part of the pawl away from them. It is easier to move the pawl if you hold the heads up then let them go down.
Single Pallet Lock Operation
You manually put the lockhead up to the LOCK position to restrain one pallet. The lockhead is spring-loaded down so you must lift the lockhead until the link locks the lockhead in the LOCK position.
You manually put down the lockhead to unload cargo. The lockhead will go down by itself when you push the lower part of the link towards it. The lower part of the link attaches to a pin. The pin follows slots in the base when you push on the lower part of the link.
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CARGO HANDLING SYSTEM -PALLET LOCK -OPERATION

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CARGO HANDLING SYSTEM -STOP/LOCK -INTRODUCTION

Purpose
Stop/locks give longitudinal and vertical restraint for pallets. Some locks also give longitudinal restraint for containers.
Location
The stop/locks are in the forward cargo compartment only. The forward compartment has one row of stop/locks. The stop/locks attach to the four roller trays adjacent to the longitudinal PDUs and aft of the ball panels. The stop/locks have partial load stops.
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CARGO HANDLING SYSTEM -STOP/LOCK -INTRODUCTION

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CARGO HANDLING SYSTEM -STOP/LOCK -OPERATION

Physical Description
The stop locks are spring-loaded mechanical units with these parts:
*
Lockhead(s)

*
Base

*
Pin

*
Link

*
Springs (not shown).

Operation
The stop/lock has two lockheads. You use only one at a time. Containers use one lockhead, pallets use the other.
You manually set the stop/locks to one of these positions:
*
LOCK (for pallets)

*
STOP (for containers)

*
UNLOAD.

You manually put the lockheads up, LOCK or STOP position to restrain cargo. The lockheads are spring loaded to down so you must lift the lockheads until the fork or the link locks the heads up.
You manually put down the lockheads to unload cargo.
The container stop lockhead (fwd cargo) will go down by itself when you lift the fork. It is easier to lower the head if you hold the head up as you lift the fork.
The pallet lock lockhead (fwd cargo) will go down by itself when you push the lower part of the link towards it. The lower part of the link attaches to the pin. The pin follows the slots in the base when you push on the lower part of the link.
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