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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
2. Door fails to raise when either switch held open (cont.) 3. Door continues to raise after control switch is released 4. Door lowers after control switch is released Defective wiring Defective hat-rack, door locked, canopy position B. or control switch Defective shutoff valve Defective control switch Defective wiring Defective check valve, relief valve, actuator, or line leak (a) Continuity OK (b) No continuity Check for voltage at terminal 1 of connector D1222 of shutoff valve. IF -A. No voltage B. Voltage present— check for short across terminals 3C-3NO of control switches No. 1 and 2. IF -(1) Short exists (2) No short Check position of control valve indicator. IF A. Indicator at position 1--check hydraulic components and lines for faulty operation or leakage Repair wiring between circuit breaker and control valve pin A Adjust or replace defective switch Replace shutoff valve Replace affected switch Repair wiring between control switch and shutoff valve Replace affected component
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
4. Door lowers after control switch is released (cont.) Defective wiring Defective door position or control switch Defective wiring B. Indicator not at position 1--check for voltage at pin A, no voltage at pin B and continuity to ground at pin E of connector D1220 of control valve. IF - (1) No voltage at pin A--check for continuity across terminals 1 and 2 of door position switch and 2C-2NC, 4C-4NC of control switches 1 and 2, IF -(a) Continuity OK (b) No continuity (2) Voltage at pin B--check for short across terminals 1 and 3 of door position switch and 2C-2NO of control switch No. 1 if below canopy position or control switch No. 2 if above canopy position. IF -(a) Short exists (b) No short exists Repair wiring between control switch and pin A of connector D1220 Adjust or replace affected switch Adjust or replace affected switch Repair wiring between control switch and pin B of connector D1220
506
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
4. Door lowers after control switch is released (cont.) 5. Door fails to stop at canopy position when being raised 6. Door fails to lower when either switch held to close Defective wiring Defective control valve Check for short across terminals 1 and 2 of canopy position B switch and 4C-4NC of control switch No. 1. IF Defective canopy position B switch or control switch No. 1 Defective check valve, relief valve or actuator Defective shutoff valve (3) No continuity to ground at pin E (4) Voltage at pins A and B and continuity to ground at pin E OK A. Short exists B. No short Check position of control valve indicator. IF -A. Indicator at position 2--check if door lowers in manual operation. IF -(1) Door still does not lower--check for faulty check valve, relief valve or actuator (2) Door lowers--check for 28v dc at pin 1 and continuity to ground at pin 3 of shutoff valve connector D1222. IF -(a) Voltage and ground OK Repair wiring between pin E and ground Replace control valve Adjust or replace affected switch See trouble 3 Replace affected component Replace shutoff valve
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