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Airstair Troubleshooting Guide

The document provides troubleshooting guidance for an airstair. It lists common symptoms, potential causes, and steps to check each system. Symptoms include doors not opening or stairs not extending or retracting properly. Causes can be failures of switches, motors or lock mechanisms. Checks involve verifying power and actuation of relevant components.

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Juan Carlos Jurado
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135 views1 page

Airstair Troubleshooting Guide

The document provides troubleshooting guidance for an airstair. It lists common symptoms, potential causes, and steps to check each system. Symptoms include doors not opening or stairs not extending or retracting properly. Causes can be failures of switches, motors or lock mechanisms. Checks involve verifying power and actuation of relevant components.

Uploaded by

Juan Carlos Jurado
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Airstair Trouble-Shooting Guide

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SYMPTOM CAUSE CHECK


EXTENSION: Door does not open Failed M1954 (normal) While extend switch is actuated, check for current at connector D40626, Pin 4 of J23
after Norm/Stby extend switch is M1953 (standby) door lock Junction Box or Pin 6 (green wire) of door lock pin actuator.
actuated pin actuator
EXTENSION: Door opens but 1. Normal M1 AC airstair 1. Check Airstair Actuator circuit breaker C850 located on P6-4 CB panel. Check for
airstair does not extend after motor anomaly. current at Pins A2, B2, and C2 (power to motor) of K1 relay. Check for current at Pin
Norm/Stby extend switch is actuated. 2. Standby M2 DC airstair Y1 (command signal) of K1 relay while extend switch is actuated.
motor anomaly 2. Check for current at Pins B1, C1 (power to motor) of K1 relay. Check for current at Pin
Y1 (command signal) of K1 relay while extend switch is actuated.
RETRACTION: Airstair does not 1. Improperly stowed 1. Check that handrails are properly stowed.
move after Norm/Stby retract switch handrail(s). 2. With retract switch actuated, push ladder assembly forward and aft; if airstair moves the
is actuated 2. S10 Switch anomaly. switch needs rigging.
3. Failed M1954 (normal) Actuate S14 Maintenance Switch to retract stairs if further troubleshooting is not
M1953 (standby) door possible.
lock pin actuator 3. Use instructions in upper most box of this column.
RETRACTION: Airstair moves S10 Switch anomaly. With retract switch actuated, push ladder assembly for and aft; if airstair moves the switch
slightly after Norm/Stby retract needs rigging using AMM TASK 52-61-16-820-801.
switch is actuated. Actuate S14 Maintenance Switch to retract stairs if further troubleshooting is not possible.
RETRACTION: Airstair stops S11 Switch anomaly. With retract switch actuated, push stowed lower ladder up; if airstair moves, the switch
movement after lower ladder is needs rigging using AMM TASK 52-61-17-820-801.
stowed. Actuate S14 Maintenance Switch to retract stairs if further troubleshooting is not possible.
Airstair door warning light Bent or broken airstair Check door lock pin sensor bracket.
illumination on P5-20 panel door lock pin sensor
bracket.
NOTE: Check all C/B’s before performing check’s. If one system is not functioning (Normal or Standby); use other system if further troubleshooting is not possible.

Revision 0 07/02/06

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