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NOTE:  Vertical restraint lips are normally extended for use with the 3G system, and should only be retracted to accommodate 9G pallets.
D.  Pallet Locks
(1)  Pallet locks are attached to floor track No. 3, 4, 5, and 6 between pallet positions throughout the system, and at forward end of the system. There are three types of pallet lock assemblies, but all are similar in design and purpose, which is to lock and restrain cargo pallets longitudinally in position. Each pallet lock includes a retractable lock mechanism, which can be raised manually to engage forward and aft edges of pallets, or retracted to clear pallets while loading and unloading. Pallet locks installed between pallet positions have lock heads that face in both directions to engage pallets both forward and aft of the lock. Forward pallet locks have a lock head that faces aft only, and two of these locks also have a guide stop assembly attached. These guide stops prevent cargo pallets overriding transfer panels when rolled from aft end towards cargo door for unloading.
E.  Pallet Brakes
(1)  Two cargo pallet brake assemblies are installed and attached to center floor track (No. 4), one in No. 2 pallet position area and the other in No. 6 pallet position area. These assemblies retard movement of cargo pallets which may move too fast on roller trays during loading or unloading of pallets.
F.  Aft Stops
(1)  Aft stop assemblies are attached to floor track No. 3, 4, 5 and 6 at aft end of cargo system in any cargo carrying configuration. These assemblies prevent cargo pallets from overriding the system at aft end when loaded into cabin. A vertical restraint lip applies vertical load restraint on aft end of aft cargo pallet.
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G.  Threshold Assembly
(1)  
Main cabin cargo door threshold assembly comprises three sections and is installed along cargo door sill to provide support and aid movement of cargo pallets through door opening, and also to protect door sill from damage by pallets. Threshold sections are installed and remain in place only during loading or unloading. Threshold assemblies must be removed before cargo door is closed. Forward and aft threshold sections are equipped with vertical scuff plates to protect lower section of door opening side structure and to aid guidance of cargo pallets through door opening. Each threshold section is equipped with cylindrical rollers on which pallets are supported. The center threshold section is also equipped with two retractable spring-loaded pallet roll-out stops. These stops are unlatched during pallet loading to prevent a pallet from inadvertently moving back out of the door opening. During pallet or equipment unloading the pallet roll-out stops are manually latched in down position so that pallets may be rolled over them without hindrance.

(2)  
Threshold sections are secured by hinged connections to attachment fittings which are attached to floor track No. 1. Manually operated locking handles permit threshold assemblies to be readily detached from their attachment fittings. The attachment fittings may remain installed in floor track when cargo door is closed.

3.  Cargo Barrier Net (Fig. 3)
A.  The cargo barrier net is an assembly of radial and circumferential straps installed across forward end of main cabin between forward entry door and main cargo door and designed to resist impact of entire cargo load up to a 9G load factor.
B.  Cargo barrier net is secured in position by connecting fittings at ends of radial straps, to shackle fittings permanently installed around upper lobe of cabin fuselage structure and in the floor structure.
4.  Sidewall Protector Panels (Fig. 4)
A.  Sidewall protective panels are installed along both sides of the main cabin in the cargo door area. The panels cover the sidewall window panels and carpet riser panels to prevent damage by cargo. Each panel is attached by fittings which hook over sidewall extrusion and by clips which engage lower edge of window panels.
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K87713
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TRANSFER PANEL - REMOVAL/INSTALLATION
EFFECTIVITY
Passenger/Cargo Convertible Airplanes
1. General
A.  The four transfer panels overlap each other and must be removed in order, starting with left-side panel No. 1 and working across to remove right-side panel No. 4 last. The panels are installed starting with right-side panel No. 4 and working across to install left-side panel No. 1 last.
　
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