(5)  
Stop for one minute and read the altitude again.
 S 865-252

 (6)  
Make sure that the altitude does not decrease by more than 80 feet

 (0.07 in. Hg).
 S 865-253 CAUTION: MAKE SURE THAT THE PITOT LINE PRESSURE IS EQUIVALENT OR MORE
_______ THAN THE STATIC LINE PRESSURE. KEEP THE STATIC PRESSURE CHANGE BELOW 5000 FEET FOR EACH MINUTE. MAKE SURE THAT THE DIFFERENTIAL PRESSURE STAYS BETWEEN 0 AND 10.00 INCHES OF MERCURY. YOU CAN CAUSE DAMAGE TO THE PITOT-STATIC SYSTEM.
 (7)  Open the static cutoff valve and send the auxiliary No. 1 static system to ambient pressure.
 NOTE: You must release the vacuum from the cutoff valves slowly.
____
 E.  Put the Airplane Back to Its Usual Condition
 S 085-384 CAUTION: DO NOT DISCONNECT THE PNEUMATIC TEST SET WHEN THE PITOT-STATIC
_______ SYSTEM IS NOT AT AMBIENT PRESSURE. YOU CAN CAUSE DAMAGE TO THE EQUIPMENT.
 (1)  Disconnect the pneumatic test set from the drain fitting.
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 ú ú 07 Page 532 ú Mar 15/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 095-408
 WARNING: WHEN THE STATIC PORTS ARE COVERED, MAKE SURE THAT CONDITION IS
_______ VISIBLE FROM THE GROUND. FAILURE TO OBSERVE AND REMOVE COVERINGS FROM THE STATICPORTS BEFORE FLIGHT MAY CAUSE LARGE ERRORS IN AIRSPEED SENSING AND ALTITUDE SENSING SIGNALS, WHICH MAY LEAD TO LOSS OF SAFE FLIGHT.
 CAUTION: MAKE SURE THAT YOU REMOVE ALL OF THE PIECES OF TAPE FROM EACH
_______ PITOT-STATIC PROBE. THE SYSTEM WILL NOT OPERATE CORRECTLY WHEN THE TAPE IS IN ITS POSITION.
 (2)  
Remove the vinyl adhesive tape from the static ports (S2) on the lower right pitot-static probe.

 S 845-260

 (3)  
Remove the vinyl adhesive tape from the aft static ports (S2) on the upper left pitot-static probe.

 S 845-261

 (4)  
Examine the static ports for unwanted materials and rough locations on the inner and outer surfaces (Ref 34-11-11/601).

 S 845-262

 (5)  
Open the FLAP LOAD RELIEF circuit breaker on the load control panel P6.

 S 865-386

 (6)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 TASK 34-11-01-795-264
 10. The Auxiliary No. 2 Static System Low-Range Leak Test
_____________________________________________________
 A. General
 (1)  The leak test is not necessary because the system is sealed with a cap at the lower-left and upper-right pitot-static probes.
 TASK 34-11-01-795-307
 11. The Alternate Static System Low-Range Leak Test
_______________________________________________
 A. Standard Tools and Equipment
 (1)  Air data test set, Castleberry AT700-2, Castleberry Instr & Avionics, Austin, TX; or equivalent
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 B.
C.
D.

A 737-300/400/500MAINTENANCE MANUAL
 (2)  
Flow restrictors, control valves, cutoff valves, and vinyl adhesive

 tape as requiredReferences

 (1)
24-22-00/201, Manual ControlPrepare for the Test

 S 865-396

 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 495-411
 WARNING:_______ FAILURE TO REMOVE VINYL ADHESIVE TAPE FROM STATIC PORTS BEFORE
 FLIGHT MAY CAUSE LARGE ERRORS IN AIRSPEED SENSING AND ALTITUDE
 SENSING SIGNALS, WHICH MAY LEAD TO LOSS OF SAFE FLIGHT.

 CAUTION:_______DO NOT EXTEND THE SEALS INTO THE STATIC PORTS. YOU CAN CAUSE DAMAGE TO THE SURFACE IN THE AREA WHEN YOU REMOVE THE SEALS.
 (2)  
Seal the left and right alternate static pressure ports with vinyl adhesive tape.

 S 485-398

 (3)  
Use these steps to connect the pneumatic test set to the alternate static system drain fitting:
　
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