B. The shutoff valve is on the APU upper shroud. You must remove the
shutoff valve through the opening in the horizontal web above the upper
shroud.
C. You can get access to the shutoff valve through the access door forward
of the APU compartment.
TASK 49-51-21-004-001
2. Cooling Air Shutoff Valve Removal (Fig. 401)
_________________________________
A. Special Tools and Equipment
(1) F71336-501 - Horizontal Stabilizer Trim Lock
B. Access
(1)
Location Zones
101 Control Cabin, LH
205 Electronic Compartment
701 Tail Compartment
703 APU Compartment
(2)
Access Panels
1201 Electronic Equipment Access Door
3701 Stabilizer Compartment Access Door
C. Procedure
S 864-002
(1)
Set the horizontal stabilizer trim in the full up position.
S 864-003
(2)
Set the switch and the circuit breakers:
(a)
Set the APU master switch, on the P5 forward overhead panel, to the OFF position and attach a DO-NOT-OPERATE tag.
(b)
Open these circuit breakers on the P6 Circuit Breaker Panel and attach the DO-NOT-CLOSE tags: 1) STABILIZER TRIM ACTUATOR 2) STABILIZER TRIM CONT 3) AUTO FLT CONT SYS B MACH TRIM AC 4) AUTO FLT CONT SYS B MACH TRIM DC 5) AFDS MCP CRS-2 6) AUTO FLT CONT SYS B SNSR EXC AC 7) AUTO FLT CONT SYS B FCC DC 8) AUTO FLT CONT SYS B ENGAGE INTLK B 9) AUTO FLT CONT SYS B WARN LIGHT BAT
(c)
Open these circuit breakers on the P18 Circuit Breaker Panel and attach the DO-NOT-OPERATE tags: 1) AUTO FLT CONT SYS A MACH TRIM AC
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
FLIGHT COMPARTMENT
YOKE
STABILIZER
TRIM WHEEL
TRIM WHEEL CONTROL STAND
HANDLE
STABILIZER TRIM LOCK
A
Cooling Air Shutoff Valve Installation
Figure 401 (Sheet 1)
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G99804
SEE B
STABILIZER
JACKSCREW
STABILIZER TRIM
ELECTRICAL ACTUATOR ELECTRICAL
CONNECTOR
ELECTRICAL
CONNECTOR
AUTOPILOT STABILIZER TRIM SERVO
MANUAL TRIM DRIVE CABLE DRUM
B
Cooling Air Shutoff Valve Installation Figure 401 (Sheet 2)
G99805
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
HORIZONTAL WEB
LIGHTENING HOLES
ACCESS DOOR
INLET DUCT FOR THE COOLING AIR SHUTOFF VALVE SEE A PNEUMATIC ACTUATOR UPPER SHROUD
COOLING AIR FAN
CROSSOVER DUCT FOR THE COOLING AIR FWD
PRESSURE LINE
NUTWASHER (2 LOCATIONS)
INLET DUCT FOR THE COOLING AIR
UPPER BOLTSHROUD FWD
A
Cooling Air Shutoff Valve Installation Figure 401 (Sheet 3)
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