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 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 auxiliary No. 1 static system equivalent to 5,000 feet of altitude above field elevation (ambient pressure minus 5.25 |0.25 in. Hg).
 CAUTION: MAKE SURE THAT YOU HOLD THE PRESSURE 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 instrument shows the necessary altitude.
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 (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 865-087
 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.
 (5)  
Open the static cutoff valve.

 S 865-300

 (6)  
Put the auxiliary No. 1 static system to ambient pressure.

 S 085-088
 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.
 (7)  Disconnect the pneumatic test set from the test fitting.
 S 085-501
 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
_______ PITOT-STATIC PROBE. THE SYSTEM WILL NOT OPERATE CORRECTLY WHEN THE TAPE IS IN ITS POSITION.
 (8)  Remove the vinyl adhesive from these locations:
 (a)  The forward static ports (S1) in the lower right pitot-static probe.
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747-400 MAINTENANCE MANUAL
 (b)  The aft static ports (S2) in the upper left pitot-static probe.
 S 215-090
 (9)  
Examine the static ports for unwanted materials and rough locations on the inner and outer surfaces (Ref 34-11-01/601).

 S 865-091

 (10)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  P6 Main Power Distribution Panel
 1) 6D30 PROBE HEAT PITOT L
 2) 6D33 PROBE HEAT AUX PITOT R
 3) 6E01 PRIM T/E FLAP CONT AC
 4) 6E02 PRIM T/E FLAP CONT DC

 TASK 34-11-00-795-092
 17. The Auxiliary No. 2 Static System Leak Test (Low-Range)_______________________________________________________
 A. Standard Tools and Equipment
 (1)  
Pneumatic Test Set

 (a) Vaccum 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.

 (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, LH 116 Area Between Nose Gear Well and Fuselage, RH 118 Electrical and Electronics Compartment, RH
　
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