747-400 AMM 飞机维护手册 导航 NAVIGATION 1(58)

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 WARNING: WHEN THE STATIC PORTS ARE COVERED, MAKE SURE THAT CONDITION IS
_______ VISIBLE FROM THE GROUND. FAILURE TO OBSERVE AND REMOVE COVERINGS OVER STATIC PORTS BEFORE FLIGHT MAY CAUSE LARGE ERRORS ON AIRSPEED SENSING AND ALTITUDE SENSING SIGNALS, WHICH MAY LEAD TO LOSS OF SAFE FLIGHT.
 WARNING:_______MAKE SURE THAT THE PROBE HEAT IS NOT ON. YOU CAN CAUSE INJURY TO PERSONS.
 CAUTION:_______DO NOT EXTEND THE SEALS INTO THE PITOT DRAINS. YOU CAN CAUSE DAMAGE TO THE SURFACE IN THE AREA WHEN YOU REMOVE THE SEALS.
 (2)  Seal these locations with vinyl adhesive tape: (a) The forward static ports (S1) in the upper right pitot-static probe. (b) The aft static ports (S2) in the lower left pitot-static probe.
 S 485-075
 (3)  Connect the pneumatic test set to the first officer's static system test fitting. (a) Connect the static (vacuum) source in the pneumatic test unit through the static control valve to the static cutoff valve. (b) Connect the quick-disconnect test fitting of the first officer's static system to the static cutoff valve through the static system test gage and flow restrictor.
 NOTE:____ You will find the test fitting on the right side of the airplane above the system drains at STA 400.
 (c)  Open the static cutoff valve.
 S 795-076
 (4)  Do a leak test of the first officer's static system (low-range).

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747-400
MAINTENANCE MANUAL

 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 first officer's 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 VACUUM 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 neccessary altitude.

 (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 865-077
 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 865-298

 (6)  
Put the first officer's static system to ambient pressure.

 NOTE: You must release the vacuum from the cutoff valves slowly.
____
 S 085-078
 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.
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747-400 MAINTENANCE MANUAL
 S 085-499
 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.
　
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