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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 PITOT-STATIC PROBE - CLEANING/PAINTING
______________________________________
 1.  General_______
 A.  This subject has two tasks. The first task is to clean the pitot opening, static ports, and drain hole of the probe. The second task is to clean the external surface of the pitot-static probe.
 B.  The pitot-static probe should not be painted. The data from the pitot-static probe can be affected if you paint the pitot-static probe.
 TASK 34-11-11-107-001
 2.  Internal Cleaning_________________
 A.  Standard Tools and Equipment
 (1)  
0.029 inch drill rod

 (2)  
0.033 inch drill rod

 (3)  
Dry air pressure source.

 B.  References
 (1)  
AMM 34-11-11/401, Pitot-Static Probe

 (2)  
AMM 34-11-11/601, Pitot-Static Probe

 C.  Access
 (1)  Location Zones
 101/102 Control Cabin
 202 Lower Nose Compartment

 D.  Cleaning the Pitot-Static Probe On the Airplane
 S 867-002
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P18 Load Control Center
 1) C1, CAPT UPPER L
 2) C2, CAPT LWR R
 3) C3, F/O UPPER R
 4) C4, F/O LWR L

 S 217-003
 WARNING:_______MAKE SURE THE PROBE HEAT IS NOT ON. THIS CAN CAUSE INJURY TO PERSONS.
 CAUTION:_______DO NOT PUT OBJECTS INTO THE STATIC PORTS. THIS CAN CAUSE DAMAGE TO THE PITOT-STATIC SYSTEM.
 (2)  
Make sure the pitot-static probe is not damaged (AMM 34-11-11/601).

 (3)  
Disconnect the pitot-static hoses from the probe (AMM 34-11-11/401).

 S 037-004
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 167-005
 CAUTION:_______DO NOT USE MORE THAN 60 PSI OF AIR PRESSURE. THIS CAN CAUSE DAMAGE TO THE PITOT-STATIC SYSTEM.
 (4)  Blow compressed dry air into the line fittings of the probe.
 (a)  
Make sure the air comes out of the pitot opening.

 (b)  
Make sure the air comes out of the static ports.

 S 437-006
 (5)  
Connect pitot-static hoses to the probe.

 S 437-007

 (6)  
Tighten the line fittings to the values that follow:
 Pitot (P) pressure line 140 |4 pound-inches
 Static (S1) pressure line 190 |10 pound-inches
 Static (S2) pressure line 270 |14 pound-inches

 S 867-008

 (7)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  P18 Load Control Center
 1) C1, CAPT UPPER L
 2) C2, CAPT LWR R
 3) C3, F/O UPPER R
 4) C4, F/O LWR L

 E. Cleaning the Pitot-Static Probe Off the Airplane
 S 027-009
 (1)  Remove the pitot-static probe (AMM 34-11-11/401).
 S 167-010
 CAUTION: DO NOT USE FLUIDS THAT CONTAIN SODIUM CHLORIDE OR SULFUR
_______ COMPOUNDS TO CLEAN THE PROBE. SODIUM CHLORIDE AND SULFUR CAN CAUSE PREMATURE FAILURE OF THE PROBE.
 (2)  
Soak or flush the pitot-static probe with clean water.

 (3)  
Drain water from the pitot-static probe.

 S 167-011
 S 167-012
 CAUTION:_______DO NOT USE MORE THAN 60 PSI OF AIR PRESSURE. THIS CAN CAUSE DAMAGE TO THE SYSTEM.
 (4)  Blow compressed dry air into the line fittings of the probe.
 (a) Make sure the air comes out of the pitot opening.
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 ALL  ú ú 01 Page 702 ú Nov 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (b)  Make sure the air comes out of the static ports.
　
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