C. Disconnect switch electrical connector from receptacle (Fig. 401).
D. Disconnect wires from switch electrical connector and retain connector.
E. Remove switch from mounting bracket.
2. Install Lower Ladder Closed Switch
A. Connect wiring of switch to switch electrical connector (Fig. 401).
B. Position switch on mounting bracket and connect switch electrical connector to receptacle.
C. Adjust and test switch (Ref 52-61-171 A/T).
5C8
Feb 20/92 52-61-171 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Forward Airstair Lower Ladder Closed Switch Installation 500
52-61-171Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/68
FORWARD AIRSTAIR LOWER LADDER CLOSED SWITCH - ADJUSTMENT/TEST
EFFECTIVITY
Standard Passenger Airplanes
1. Forward Airstair Lower Ladder Closed Switch Adjustment
A. Equipment and Materials
(1) Voltohmmeter - Simpson, Model 260
B. Adjust Lower Ladder Closed Switch
(1) Extend airstair just enough to gain access to lower ladder closed switch.
WARNING: DO NOT OPERATE THE AIRSTAIR WHEN THESE CONDITIONS OCCUR:
-YOU WILL OPERATE THE AIRSTAIR MORE THAN 3 CYCLES IN 20 MINUTES -THE WIND IS MORE THAN 40 KNOTS -THERE IS NO SUPPORT UNDER THE END OF THE AIRSTAIR WHEN THE AIRPLANE IS ON JACKS -THE FORWARD ENTRY DOOR IS OPENED FULLY -THE AREA IS NOT CLEAR OF PEOPLE OR EQUIPMENT.
IF YOU OPERATE THE AIRSTAIR WHEN THESE CONDITIONS OCCUR, YOU CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
NOTE: Do not allow lower ladder to unlock from upper ladder.
(2)
Open the following circuit breakers on circuit breaker panel P6.
(a)
Forward Airstair Control
(b)
Forward Airstair Standby Control
(3)
Loosen jamnuts holding switch to mounting bracket and move switch roller until roller just contacts lower ladder.
(4)
Connect ohmmeter between pins 1 and 3 of connector on upper ladder and check that the switch is open.
(5)
Adjust jamnuts to move switch until switch plunger is depressed 0.16 0.01/-0.01 inch and check that switch is closed.
(6)
Disconnect ohmmeter and reconnect connector on upper ladder.
(7)
Close the above circuit breakers.
5C8
Feb 20/92 52-61-171 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Forward Airstair Lower Ladder Closed Switch Adjustment 500
52-61-171 Figure 501 Nov 15/68
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
FORWARD AIRSTAIR MANUAL HANDRAIL STOWED SWITCHES - REMOVAL/INSTALLATION
EFFECTIVITY
Standard Passenger Airplanes
1. General
A. The manual handrail stowed switches are identical switches which are removed and installed in the same manner. Therefore, the following procedure is applicable to both switches. Each switch is located in the inboard end of each upper handrail.
WARNING: DO NOT OPERATE THE AIRSTAIR WHEN THESE CONDITIONS OCCUR:
-YOU WILL OPERATE THE AIRSTAIR MORE THAN 3 CYCLES IN 20
MINUTES -THE WIND IS MORE THAN 40 KNOTS -THERE IS NO SUPPORT UNDER THE END OF THE AIRSTAIR WHEN THE
AIRPLANE IS ON JACKS -THE FORWARD ENTRY DOOR IS OPENED FULLY -THE AREA IS NOT CLEAR OF PEOPLE OR EQUIPMENT.
IF YOU OPERATE THE AIRSTAIR WHEN THESE CONDITIONS OCCUR, YOU CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
2. Remove Forward Airstair Manual Handrail Stowed Switches
A. Operate forward airstair to fully extended position, but do not engage manual handrail extensions to their supports inside forward entry door.
B. Open forward airstair system circuit breaker on circuit breaker panel P6.
C. Disconnect wire leads from switch electrical connector (P15 for forward switch or P16 for aft switch) mounted on lower surface of upper ladder top step (Fig. 401).
D. Tie a length of cord to end of disconnected leads.
NOTE: Check that cord is of sufficient length to extend from electrical connector position up through upper stanchion to upper stanchion pivot fitting, with about one foot of excess length at each end.
E. Remove handrail extension from stowed position and move to one side.
F. Remove four screws attaching switch support to upper handrail.
G. Remove support, with switch attached, from pivot fitting.
H. Remove single jamnut attaching switch to support and separate.
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