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A 737-300/400/500MAINTENANCE MANUAL

SEE

PACK TRIP OFFA 
WING-BODY OVERHEATA 
BLEED TRIP OFFA 

PACK TRIP OFFA 
WING-BODY OVERHEATA 
BLEED TRIP OFFA 

Dual Duct Pressure Indicator Installation
Figure 401 (Sheet 1)

H77125
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A

737-300/400/500
MAINTENANCE MANUAL

1. ELECTRICAL CONNECTOR
 2. PRESSURE INDICATOR
 4. CLAMP SCREW  3. CLAMP

FWD 
6. BLEED AIR CONTROL PANEL B  (6 LOCATIONS) FASTENER 5. QUARTER TURN 

Dual Duct Pressure Indicator Installation
Figure 401 (Sheet 2)

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H77190
A
737-300/400/500MAINTENANCE MANUAL
 TASK 36-21-20-364-008
 3.  Dual Duct Pressure Installation (Fig. 401)_______________________________
 A. References
 (1)  
AMM 24-22-00/201, Electrical Power

 (2)  
AMM 36-05-00/201, Pneumatic System (Selection)

 B. Access
 (1)  Location Zone
 212 Flight Compartment - Right

 C. Install the Dual Duct Pressure Indicator
 S 014-009
 (1)  
Put the pressure indicator (2) backward from the front of the bleed air control panel (6) through the clamp (3) on the back.

 S 424-010

 (2)  
Tighten the clamp screw (4) to 15 to 18 pound-inches.

 S 424-011

 (3)  
Install the electrical connector (1).

 S 424-012

 (4)
Install the bleed air control panel (6) into the P5 panel frame.

 (a) Engage the quarter-turn fasteners (5) (6 locations).
 D. Dual Duct Pressure Indicator Test
 S 424-013
 (1)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 (a)  Circuit Breaker Panel, P6-4:
 1) 6D01, AIR CONDITIONING PRESS IND

 (2)
Do this task: Supply Electrical Power (AMM 24-22-00/201).

 S 864-015

 (3)  
Do this task: Supply Pressure to the Pneumatic System (Selection) (AMM 36-05-00/201).

 S 864-016

 (4)  
Put the ISOLATION VALVE switch on the bleed air control panel (6) to OPEN.

 S 864-014
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737-300/400/500MAINTENANCE MANUAL
 S 864-017
 (5)  
Make sure that the L and R duct pressure needles on the pressure indicator show approximately the same pressure.

 S 864-018

 (6)  
Put the ISOLATION VALVE switch on the bleed air control panel (6) to CLOSE.

 S 864-019

 (7)  
Make sure that one of the duct pressure needles shows a decrease in pressure.

 E. Put the Airplane to Its Usual Condition
 S 864-020
 (1)  Do this task: Remove Pressure from the Pneumatic System
 (AMM 36-05-00/201).

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