(f)  
Make sure that the airspeed does not decrease by more than 5.0 knots (0.16 in. Hg).

 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

 S 862-020
 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/MINUTE AND DIFFERENTIAL PRESSURE BETWEEN 0 AND
 10.19 INCHES OF MERCURY. YOU CAN CAUSE DAMAGE TO THE ELEVATOR FEEL COMPUTER.
 (9)  Open the pitot cutoff valve and put the auxiliary No. 2 pitot system back to ambient pressure.
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747-400 MAINTENANCE MANUAL
 S 082-021
 CAUTION:_______ MAKE SURE THE PITOT-STATIC PROBE HAS NO ADDED WEIGHT FROM THE
 TEST HOSES.  YOU CAN BEND OR TWIST THE PITOT-STATIC PROBE OUT
 OF TOLERANCE.
 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.

 (10)
 Disconnect the pneumatic test set from the pitot-static probe adapters.

 S 082-022

 (11)
 Remove the probe adapters from all of the pitot-static probes:

 (a)  Remove the probe adapters from the probes.
 NOTE: Clean the pitot-static probes with a soft rag when you
____ use ethylene glycol.
 WARNING: FAILURE TO REMOVE BARRICADE TAPE AND 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: MAKE SURE THAT YOU REMOVE ALL OF THE PIECES OF TAPE FROM
_______ EACH DRAIN HOLE AND STATIC PORT. THE SYSTEM WILL NOT OPERATE CORRECTLY WHEN THE TAPE IS IN ITS POSITION.
 (b)  
Remove the vinyl adhesive tape from all of the pitot chamber drain holes.

 (c)  
Remove the vinyl adhesive tape from all four of the static ports of the pitot-static probes (S1 and S2).

 S 212-023
 (12)
 Examine the drain holes and static pressure ports for unwanted materials and rough locations on the inner and outer surfaces (AMM 34-11-01/601).

 S 212-024

 (13)
 Examine the pitot-static probes for signs of damage to the pitot tips and to the static ports (AMM 34-11-01/601).

 (14)
 Remove all of the pitot-static pneumatic test hoses and equipment.

 S 082-032
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 S 862-025
 (15) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P6 Main Power Distribution Panel
 1) 6D30, PROBE HEAT PITOT L
 2) 6D31, PROBE HEAT PITOT R
 3) 6D32, PROBE HEAT AUX PITOT L
 4) 6D33, PROBE HEAT AUX PITOT R

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747-400 MAINTENANCE MANUAL
 PITOT-STATIC SYSTEM - SERVICING
_______________________________
 1.  General_______
 A.  This subject contains two tasks. The first task is to drain the pitot-static system. The second task is to flush the pitot-static system. When you drain the system you must remove the drain cap from each pitot-static system drain. You must replace the drain cap when the collected liquid has drained from the system. The second task contains
　
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