34-11-01

 ú ú 04 Page 506 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-022
 CAUTION:_______ MAKE SURE THAT THE PITOT LINE PRESSURE IS EQUIVALENT OR MORE
 THAN THE STATIC LINE PRESSURE.  KEEP THE PITOT PRESSURE CHANGE
 BELOW 300 KNOTS FOR EACH MINUTE AND THE STATIC PRESSURE CHANGES
 LESS THAN 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.

 (1)  Apply pressure to the pitot-static system equal to 22,500 |200 feet of altitude (12.37 |0.10 in. Hg absolute) and 300 |5 knots of airspeed (4.53 |0.16 in. Hg differential).
 NOTE: Monitor the differential pressure during this step to make
____ sure that you obey the caution above.
 S 865-025
 CAUTION: HOLD THE VACUUM, AS AN ALTERNATIVE, BEHIND THE CUTOFF VALVES
_______ DURING THE CUTOFF TIME. YOU CAN CAUSE DAMAGE TO THE EQUIPMENT WHEN YOU OPEN THE CUTOFF VALVES WITHOUT THE VACUUM.
 (2)  
Close the pitot and static system cutoff valves when the necessary altitude and airspeed are reached.

 S 865-027

 (3)  
Stop for 5 to 6 minutes to permit the systems to become stable.

 S 865-028

 (4)  
Record the altitude and the airspeed.

 S 865-029

 (5)  
Stop for one minute.

 S 865-030

 (6)  
Make sure that the altitude does not decrease by more than 400 feet.

 S 865-031

 (7)  
Make sure that the airspeed does not decrease by more than 5.0 knots

 (0.16 in. Hg).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

 34-11-01
 ú ú 02 Page 507 ú Mar 15/98

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-032
 CAUTION: MAKE SURE THAT THE PITOT LINE PRESSURE IS EQUIVALENT OR MORE
_______ THAN THE STATIC LINE PRESSURE. KEEP THE PITOT PRESSURE CHANGE BELOW 300 KNOTS FOR EACH MINUTE AND THE STATIC PRESSURE CHANGES LESS THAN 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.
 (8)  Open the pitot and static system cutoff valves and put the
 pitot-static systems to ambient pressure.

 NOTE: You must release the vacuum from the cutoff valves slowly.
____
 F. Put the Airplane Back to Its Usual Condition
 S 865-035
 CAUTION:  DO NOT DISCONNECT THE PNEUMATIC TEST SET UNLESS THE PITOT-STATIC SYSTEM IS AT AMBIENT PRESSURE. YOU CAN CAUSE DAMAGE TO THE EQUIPMENT.
 (1)  Remove the pneumatic test set from the alternate static system.
 (a)  Remove the static line from drain No. 5.
 WARNING:  FAILURE TO REMOVE VINYL ADHESIVE TAPE FROM THE STATIC
_______ PORTS BEFORE FLIGHT MAY CAUSE LARGE ERRORS IN THE SIGNALS FOR AIRSPEED AND ALTITUDE. THIS MAY LEAD TO LOSS OF SAFE FLIGHT.
 CAUTION:  MAKE SURE THAT YOU REMOVE ALL OF THE PIECES OF TAPE FROM
_______ EACH STATIC PORT. THE SYSTEM WILL NOT OPERATE CORRECTLY UNLESS THE TAPE IS REMOVED.
 (b)  
Remove the vinyl adhesive tape from the left and right alternate static pressure ports.

 (c)  
Examine the alternate static pressure ports for unwanted materials and rough locations on the inner and outer surfaces.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

 34-11-01

 ú ú 05 Page 508 ú Nov 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-040
 CAUTION:_______ MAKE SURE THAT THE PITOT-STATIC PROBE HAS NO ADDED WEIGHT FROM
　
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