SEE SHEET 2 (BLOCK 5)
Amber COWL ANTI-ICE Light Illuminated with Engine Anti-Ice Switch Selected On
Figure 101 (Sheet 1)
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A 737-300/400/500MAINTENANCE MANUAL
FROM SHEET 1 (BLOCK 4)
ON COWL ANTI-ICE OVHT PRESSURE SWITCH S806 SWITCH S866. REMOVE CONNEC-(AMM 30-21-21/401).TOR D2558 FROM ANTI-ICE DUCT OVER PRESSURE SWITCH S806. CHECK THE RESISTANCE FROM PINS 1 AND 2 OF SWITCH S806 (WDM 75-11-11).
IS THE RESISTANCE GREATER THAN 1 MEGOHM?
YES NO
6 CHECK RESISTANCE BETWEEN
45 REPLACE ANTI-ICE DUCT OVER PINS 1 AND 3 OF SWITCH S806. PRESSURE SWITCH S806 IS THE RESISTANCE 1 MEGOHM (AMM 30-21-21/401). OR GREATER?
YES NO
7 MEASURE VOLTAGE ACROSS 46 REPLACE ENGINE/WING
PINS 1 AND 2 OF CONNECTOR D2558.
IS THE VOLTAGE: . 28 |3V DC (MASTER CAUTION BRIGHT) . 16 |2V DC (MASTER CAUTION DIM)
YES
ANTI-ICE CONTROL MODULE P5-11 (AMM 30-11-41/401).
IF THE PROBLEM CONTINUES, EXAMINE THE SHIPS WIRING FROMENGINE/WING ANTI-ICE CONTROL MODULE P5-11 AND CONNEC-TOR D2558. REPAIR THE PROBLEMS THAT YOU FIND.
8 FAULT ISOLATE ENG BLEED
AIR DISTRIBUTION SYSTEM
(AMM 36-11-05).
IF THE PROBLEM CONTINUES, REPLACE THE ENG COWL ANTI-ICE VALVE V4 (AMM 30-21-11/401).
Amber COWL ANTI-ICE Light Illuminated with Engine Anti-Ice Switch Selected On Figure 101 (Sheet 2)
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A
BLUE "COWL VALVE OPEN" LIGHT AND APPLICABLE ENGINE ANTI-ICE SWITCH ARE IN DISAGREEMENT
YES
1
OPEN FAN COWLS. CHECK THAT ENGINE COWL ANTI-ICE SHUTOFF VALVE IS NOT LOCKED IN THE OPEN OR MID OPEN POSITION.
IS SHUTOFF VALVE LOCKED IN THE OPEN OR MID OPEN POSI-TION?
NO
YES
NO
YES
NO
YES
3 PLACE ENG ANTI-ICE SWITCH ON THE P5-11 PANEL TO THE
OFF POSITION.
REMOVE CONNECTOR D196 FROM THE ENGINE COWL ANTI-ICE VALVE, V4 (WDM 75-11-11).
CHECK FOR 28V DC AT PIN 1 (PIN 2, GND) OF CONNECTOR.
IS 28V DC AVAILABLE?
NO
NO
4 CHECK FOR 10V |5V DC AT
IS 10V |5V DC AVAILABLE?
YES
SEE SHEET 2 (BLOCK 5)
737-300/400/500
MAINTENANCE MANUAL
PREREQUISITES
MAKE SURE THESE CIRCUIT BREAKERS ARE CLOSED: 6C13,6D13,18A1,18A2,18A3,18A4
MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: ELECTRICAL POWER IS ON (AMM 24-22-00/201) PNEUMATIC POWER IS ON (AMM 36-00-00/201)
22 RESTORE VALVE TO UNLOCKED CONFIGURATION.
23 INSTALL CONNECTOR D196 ON ENGINE COWL ANTI-ICE VALVE, V4.
REPLACE ENGINE/WING ANTI-ICE CONTROL MODULE, P5-11 (AMM 30-11-41/401).
24 INSTALL CONNECTOR D196 ON
ENGINE COWL ANTI-ICE VALVE,
V4.
REPLACE ENGINE/WING ANTI-ICE CONTROL MODULE, P5-11 (AMM 30-11-41/401).
IF THE PROBLEM CONTINUES, EXAMINE ENGINE 1 (2) CIRCUIT FROM PIN 9 OF CONNECTOR D196, TO PIN 15 (14) OF CONNECTOR D462 (D648)(WDM 75-11-11,-12).
REPAIR THE PROBLEMS THAT YOU FIND.
Blue COWL VALVE OPEN Light and Applicable Engine Anti-Ice Switch Are in Disagreement
Figure 102 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
FROM SHEET 1
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