Technical data

13773-001
53-20
Page 1
AUXILIARY STRUCTURE
1. DESCRIPTION
This section describes those structural components which make up the auxiliary structure including
fuselage floor structure, floor access panels, entry step, and support handle.
A. Entry Step and Support Handle
The entry step is constructed 0.049" gage streamline steel tubing. The entry step has 0.09" gage
flanges that are welded to the tubing and secured to the fuselage belly and the aft floor. The support
handle is constructed of 0.38" solid aluminum and secured to the top of the fuselage by screws.
B. Fuselage Floor Structure
The floor structure of the airplane consists of a forward floor and an aft floor. Both are foam core com-
posite laminate panels designed to support flight and user loads. The front floor supports forward and
aft console structures, rudder pedals, and a pulley gang assembly. The aft floor supports aft wing
attachment loads, aft passenger seat loads, and cargo loads. The front floor is bonded to the sides of
the fuselage and is supported by two longerons, firewall, and spar box. The aft floor is bonded to the
sides of the fuselage and is supported by two longerons, the spar box, bulkhead 186, and bulkhead
222.
2. MAINTENANCE PRACTICES
A. Fuselage Floor Access Panels (See Figure 53-201)
(1) Removal - Fuselage Floor Access Panels
(a) Remove carpeting covering access panel. (Refer to 25-10)
(b) Remove seat covering access panel, if necessary. (Refer to 25-10)
(c) Remove screws securing access panel to fuselage floor.
(d) Remove access panel.
(2) Installation - Fuselage Floor Access Panels
(a) Position access panel to floor access hole.
(b) Install screws securing access panel to fuselage floor.
(c) Install seat, if necessary. (Refer to 25-10)
(d) Install carpeting. (Refer to 25-10)
B. Entry Step (See Figure 53-202)
(1) Removal - Entry Step
(a) Remove carpet and access panel CF5 from baggage compartment floor. (Refer to 6-00)
(b) Remove nuts, washers, and bolts securing entry step to baggage compartment floor.
(c) While supporting entry step, remove nuts, washers, and bolts securing step to fuselage
belly and remove from airplane.
(2) Installation - Entry Step
(a) Position entry step to baggage compartment floor and fuselage belly.
(b) Install bolts, washers, and nuts securing entry step to baggage compartment floor and
fuselage belly.
(c) Install access panel CF5 and carpet to baggage compartment floor. (Refer to 6-00)
30 Nov 2000