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 400.
 (c)  Open the static cutoff valve.
 S 795-105
 (3)  Do a leak test of the alternate static system (low-range).
 CAUTION: MAKE SURE THAT THE PITOT LINE PRESSURE IS EQUIVALENT OR
_______ MORE THAN THE STATIC LINE PRESSURE. KEEP THE STATIC PRESSURE CHANGES LESS THAN 5000 FEET FOR EACH MINUTE. MAKE SURE THAT THE DIFFERENTIAL PRESSURE STAYS BETWEEN 0 AND 10.19 INCHES OF MERCURY. YOU CAN CAUSE DAMAGE TO THE PITOT-STATIC SYSTEM.
 (a)  Apply vacuum to the alternate static system equivalent to 5,000 feet of altitude above field elevation (ambient pressure minus
 5.25 |0.25 in. Hg).
 CAUTION: HOLD THE VACUUM, AS AN ALTERNATIVE, BEHIND THE CUTOFF
_______ VALVE DURING THE CUTOFF TIME. YOU CAN CAUSE DAMAGE TO THE EQUIPMENT WHEN YOU OPEN THE CUTOFF VALVE WITHOUT THE VACUUM.
 (b)  
Close the static cutoff valve to the system when the necessary altitude is reached.

 (c)  
Stop for 5 to 6 minutes to permit the system to become stable.

 (d)  
Write the altitude.

 (e)  
Stop for 1 minute and read the altitude again.

 (f)  
Make sure that the altitude does not go down by more than 80 feet (0.07 in. Hg).

 S 865-106
 CAUTION: MAKE SURE THAT THE PITOT LINE PRESSURE IS EQUIVALENT OR MORE
_______ THAN THE STATIC LINE PRESSURE. KEEP THE STATIC PRESSURE CHANGES LESS THAN 5000 FEET FOR EACH MINUTE. MAKE SURE THAT THE DIFFERENTIAL PRESSURE STAYS BETWEEN 0 AND 10.19 INCHES OF MERCURY. YOU CAN CAUSE DAMAGE TO THE PITOT-STATIC SYSTEM.
 (4)  Open the static cutoff valve.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 34-11-00
 ALL  ú ú 03 Page 562 ú Oct 10/93
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A
747-400 MAINTENANCE MANUAL
 S 865-303
 (5)  Put the alternate static system to ambient pressure.
 NOTE: You must release the vacuum from the cutoff valves slowly.
____
 S 085-107
 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.
 (6)  Disconnect the pneumatic test set from the test fitting.
 S 085-505
 WARNING: FAILURE TO REMOVE THE VINYL ADHESIVE TAPE FROM THE STATIC PORTS
_______ 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
_______ STATIC PRESSURE PORT. THE SYSTEM WILL NOT OPERATE CORRECTLY WHEN THE TAPE IS IN ITS POSITION.
 (7)  
Remove the vinyl adhesive tape from the left and right alternate static pressure ports.

 S 215-109

 (8)  
Examine the alternate static pressure ports for unwanted materials and rough locations on the inner and outer surfaces.

 TASK 34-11-00-795-435
 19. The Static System Cross-Manifold Test
_____________________________________
 A. Standard Tools and Equipment
 (1)  
Pneumatic Test Set

 (a) Vacuum source, 10 to 30 inches of mercury (absolute)

 (2)  
Gages

 (a)  Static system test gage - required to indicate 10 to 30 inches of mercury (absolute) with accuracy of |0.1 (readable to |0.01) inch of mercury or |200 (readable to |20) feet.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 34-11-00
 ALL  ú ú 02 Page 563 ú Feb 15/98
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A
747-400
MAINTENANCE MANUAL

 (3)  Flow restrictors, control valves, cutoff valves, and pressure tape as required.
 B. References
 (1)  34-11-01/601, Pitot-Static Probe
 C. Access
 (1)  Location Zone 115 Area Between Nose Gear Well and Fuselage Left 116 Area Between Nose Gear Well and Fuselage Right 117 Electrical and Electronics Compartment, LH 118 Electrical and Electronics Compartment, RH 121 Forward Cargo Container Compartment Forward Half, LH 122 Forward Cargo Container Compartment Forward Half, RH
 D. Prepare for the Test
　
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