521
Oct 20/83 52-61-0
Page 103
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
526
52-61-0 Page 104 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 15/78
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Airstair will not Door interlock relay Disconnect connector Replace relay or
extend with defective if airstair D4822J at interior control adjust door warning
NORMAL power extends with external control only Normal extend limit switch defective Normal door open switch defective Normal airstair relay or normal stair motor defective panel and check for 28 volts dc at pin 5. If voltage is not present, relay is defective or forward entry door warning sensor is defective Disconnect airstair connector D934 and check continuity between pin 5 on plug P1 and pin Y1 on normal relay K1. If open is present, switch is defective Disconnect airstair connector D934 and check for 28 volts dc at pin 5 on D934 with airstair control in extend position. If voltage is not present, switch is defective Disconnect normal motor connector J4 and check for 115 volts ac at pins 1, 2 and 3 with airstair control in extend position. If voltage is not present at all three pins, relay is defective. If voltage is present, motor is defective sensor. Refer to 52-71-0 Adjustment/Test Replace or adjust switch. Refer to 52-61-151, Adjustment/Test Replace or adjust switch. Refer to 52-61-611 Adjustment/Test Replace either the relay or motor
Airstair will not Door interlock relay Disconnect connector D822J Replace relay or
extend with defective if airstair at interior control panel and adjust door warning
STANDBY power extends with external control only check for 28 volts dc at pin 2. If voltage is not present, relay is defective or forward entry door warning sensor is defective sensor. Refer to 52-71-0 Adjustment/Test
506
Aug 15/68 52-61-0
Page 105
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Airstair will not extend with STANDBY power (cont.) Airstair extends too slow with normal power Standby door open limit switch defective Standby airstair relay or standby airstair motor defective Normal airstair relay, or normal airstair motor is defective Speed up switch or relay defective Slow-down operating switch or slow-down operating relay defective Disconnect airstair connector D934 and check for 28 volts dc at pin 17 on D934 with the airstair control in the standby extend position. If voltage is not present, switch is defective Operate airstair in standby mode. If stair operates, motor and relay ok. If stair does not operate, see following trouble for remedy: Open FORWARD AIRSTAIR STANDBY CONTROL circuit breaker and operate airstair in normal mode. If stair extends, relay and motor ok. If not, motor or relay is defective. See proceeding trouble for remedy With airstair retracted and FORWARD AIRSTAIR ACTUATOR circuit breakers open, check for 28 volts dc at terminals X1 and A2 of speedup relay with control in extend position. If both voltages are present, relay is defective. If both are not present, switch is defective. Extend airstair fully, using normal power and note ladder rotation rate. If rate is too rapid, slow-down switch or relay is defective Replace or adjust switch. Refer to 52-61-611, Adjustment/Test Replace or adjust speedup switch. Refer to 52-61-211. Replace relaySee following trouble for rapid airstair ladder extension
526
52-61-0 Aug 15/69
Page 106
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Normal actuator motor continues to run after extension with NORMAL power applied Standby airstair motor continues to run after ladder rotation with NORMAL power applied Airstair ladders extend rapidly creating hazard to ground personnel with NORMAL power Normal stair extend limit switch or normal airstair relay is defective Slow-down operating switch or slow-down operating relay defective Standby airstair relay defective Standby motor or standby retract relay defective Slow-down operating switch or slow-down relay defective Disconnect airstair connector D934 and check for continuity between pin 5 and pin 18 of plug P1. If not open, switch is defective. If open, relay is defective Check for 28 volts dc at terminal X1 of relay with control in extend position. If voltage is present, switch is defective. If voltage is not present, relay is defective Disconnect standby airstair motor connector J3 and measure 28 volts dc at pin 2 of J3. If voltage is present, relay is defective Partially retract airstair using standby power. If stair will not retract, see trouble under paragraph 4, Airstair Retraction Trouble Shooting Chart Check for 28 volts dc at terminal X1 of slow-down relay with control in normal extend position. If voltage is not present, switch is defective. If voltage is present, relay is defective Replace or adjust switch. Refer to 52-61-151, Adjustment/Test. Replace relay Replace or adjust switch. Refer to 52-61-201, Adjustment/Test. Replace relay Replay relay Replace motor or relayReplace or adjust switch. Refer to 52-61-201, Adjustment/Test. Replace relay
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：737 AMM 飞机维护手册 舱门 DOORS(136)
