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Airplanes With Aft Airstair
1.  General
A.  The aft airstair handrails will require removal when handrail replacement is required or the folding mechanism is to be adjusted and tested (Ref Aft Airstair Folding Mechanism -Adjustment/Test). The following procedures are applicable to either the forward or aft handrails (Fig. 401).
B.  Individual aft airstair handrail sections may be removed and installed using aft airstairs handrail hinge pin wrench to remove the hinge pins. Use of this tool is applicable only to airstairs with hinge pin installations as shown in Fig. 401.
2.  Equipment and Materials
A.  Lockbolt - BACB30LA6-2 (8 required), new installation only
B.  Lockbolt - BACB30LA8-4 (6 required), new installation only
C.  Aft Airstairs Handrail Hinge Pin Wrench - F80157-1, or equivalent
3.  Remove Aft Airstair Handrails
A.  Extend airstairs fully.
B.  Open aft airstair circuit breaker on P6 panel.
C.  Remove individual handrail sections on airstairs having hinge pins as shown in Fig. 401 by using hinge pin wrench to hold the hinge pin while turning screw. This applies to all handrail sections joined by the hinge pins. If removal of complete aft airstair handrail installation is required proceed to step D.
D.  Remove cotter pin, nut and washers from upper inboard and lower stanchion at upper and lower segments respectively.

E.  Remove cover and nut cap in upper side rail to gain access to fastener at upper outboard stanchion.
F.  Remove nut and washers from upper outboard stanchion and center stanchion at upper and center ladder segments.
Feb 15/79 52-14-141 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Aft Airstair Handrails Installation  500 
52-14-141Page 402   Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 1/74 

G.  Disconnect handrail tie rods from upper and center ladder segments.
CAUTION:  SUPPORT HANDRAIL TO PREVENT HANDRAIL COLLAPSE WHICH CAN RESULT IN HANDRAIL DAMAGE.
H.  Remove handrails from airstair.
4.  Install Aft Airstair Handrails
A.  Install individual handrail sections by inserting hinge pins through mating parts and installing screw while holding hinge pin with handrail hinge pin wrench. Install special washers and spacers at required locations. If installing the complete handrail installation, proceed to step B.
B.  Orient handrail assembly as shown in Fig. 401 and insert upper outboard and center stanchion fittings in upper and center ladder segments. Install washers and nut and tighten.
CAUTION:  SUPPORT HANDRAIL TO PREVENT HANDRAIL COLLAPSE WHICH CAN RESULT IN HANDRAIL DAMAGE.
NOTE:  If new handrail assembly is being installed, tape or tie upper handrails to upper and lower stanchions since lockbolts are not installed at this time.
C.  Install nut cap in upper side rail access hole for fastener at upper outboard stanchion and install cover.
D.  Position upper inboard and lower stanchions on upper and middle segments and install bolts, washers (three required) and nuts. Tighten nut to a torque range of 100 to 1000 pound-inches and install cotter pin.
NOTE:  Add or remove one washer to permit installation of cotter pin with nut tightened to required torque.
E.  Connect both handrail tie rods to upper and middle ladder segment cranks. If a new handrail is being installed or the tie rods have been replaced or adjusted, connect only the center stanchion tie rod and rig handrails as follows:
(1)  Manually retract the airstair and manually aid handrails to fold (Fig. 402).
CAUTION:  CONTINUALLY CHECK THAT HANDRAIL PIVOT JOINTS ARE FREE OF BINDING AS AIRSTAIR RETRACTS. BINDING OF JOINTS CAN CAUSE DAMAGE TO HANDRAILS.
500 
Aug 1/74  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  52-14-141 Page 403 

Aft Airstair Handrails Rigging  500 
52-14-141  Figure 402  May 15/69 
Page 404 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(2)  
with airstair retracted, disconnect center stanchion tie rod (1). If lockbolts (2) and (7) are already installed, go directly to step (9).

(3)  
Position outboard upper ladder stanchion (9) parallel to top surface of upper ladder beam

(10) within 0.06 inch.

(4)  
Rotate upper stanchion (6) until handrail contacts bumper (5) with a 3- to 5-pound preload.

(5)  
Drill six 0.260 ±0.003-0.000-inch holes in upper stanchion per predrilled holes in handrail. Install BACB30LAC8-4 lockbolts (detail A).
　
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