Forward Airstair Door Open Limit Switches Installation 500
52-61-611 Figure 401 Aug 15/67
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
FORWARD AIRSTAIR DOOR OPEN LIMIT SWITCHES -ADJUSTMENT/TEST
EFFECTIVITY
Standard Passenger Airplanes
1. Forward Airstair Door Open Limit Switches Adjustment
A. General
(1) The following adjustment procedure is applicable to each of the two door open limit switches (normal system limit switch and standby system limit switch).
B. Adjust Airstair Door Open Limit Switches
(1)
Open airstair door, using normal or standby mode, until dimension between end of jackscrew threads and inboard face of jackscrew nut is as shown in Section A-A, Fig. 501.
(2)
Open forward airstair circuit breakers on circuit breaker panel P6.
(3)
Loosen lockscrew on inboard edge of switch operating arm.
(4)
Turn worm gear on outboard edge of switch operating arm to drive arm against switch actuator bar on door carriage until switch actuates (indicated by an audible click).
(5)
Tighten lockscrew of switch operating arm and install safety wire on lockscrew.
(6)
Close the forward airstair circuit breakers on circuit breaker panel P6.
(7)
Cycle airstair door electrically (using normal system and standby system) to check that each switch actuates to stop actuator. When door is retracted to fully open position, check that stops on ballnut do not contact snubber. Adjust switch, if necessary, within switch adjustment limits.
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.
5C8
Feb 20/92 52-61-611 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Forward Airstair Door Open Limit Switches Adjustment 500
52-61-611 Figure 501 (Sheet 1) Aug 15/67
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Forward Airstair Door Open Limit Switches Adjustment
Nov 01/73 Figure 501 (Sheet 2) 52-61-611
Page 503
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
DOOR WARNING SYSTEM - DESCRIPTION AND OPERATION
1. General
A. The door warning system is an electrical circuit which provides the flight crew with a visual warning if certain doors are open or incompletely latched (Fig. 1). The doors included in this system are the forward and aft entry doors, the forward and aft galley service doors, the forward and aft cargo compartment doors, the lower nose compartment access door, the forward airstair door, the electronic equipment compartment external access door, and the tire burst protector screen doors (if installed).
B. The warning provided by the system consists of independent warning lights which are installed on the P5-20 Door Warning Module located on the overhead panel. The lights can be tested individually or by a master test switch that simultaneously checks all of the door warning system lights and similar lights in the control cabin. Each door warning light consists of a translucent lens cap illuminated by a pair of bulbs with a background light which continuously illuminates the legend on the cap. The illuminated color is amber/opaque and the nonilluminated color is white/gray. The warning lights are energized and de-energized when the microswitches or proximity sensors in the respective circuits in the door warning system are activated and deactivated.
C. The proximity sensor is a part of a solid-state switching circuit (Fig. 2). The circuit consists of a sensor installed at the door, an actuator that is located immediately adjacent to the sensor unit when the door is closed, and a control card located in the solid-state M278 miscellaneous switching module on shelf E3-2 on the electronic equipment rack. The rack is accessible through the electronic equipment compartment external access door. The sensor senses the proximity of the actuator, or conversely, the absence of the actuator, and thus provides the appropriate signal to a control card in the module. The sensor and control card function together as a switch. The control card uses the signal from the sensor to actuate the warning light. The sensor and actuator can be physically adjusted in relation to each other; however, any system malfunction which can be isolated to the control card can be corrected only by replacement of the control card.
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