747飞机维护手册AMM CHAPTER 34 - NAVIGATION 第34章导航1(46)

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 (a)  Prepare for static system cross-manifolding test. 1) Installation should be complete and ready for operational
 check.
 2) Pitot probe heater and autopilot should remain off.
 3) Both static source selector valves should be in NORMAL
 position. 4) All pitot systems should remain vented to field barometric pressure. 5) Captain's and first officer's altitude indicator should be set to field barometric pressure.
 6)  Vacuum source should be applied only to static system under test. All other static systems should remain vented to field barometric pressure.
 7)  Any pressure regulating function within vacuum source should be inoperative during this test. (For Texas Instrument Gage Test Set, use SERVO CONTROL to apply vacuum and switch to SERVO GAGE control for the test.)
 (b)  Captain's Static Cross-Manifolding Check
 1) Seal these locations with vinyl adhesive tape:

 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 IN AIRSPEED-SENSING AND ALTITUDE-SENSING SIGNALS, WHICH MAY LEAD TO LOSS OF SAFE FLIGHT.
 CAUTION: DO NOT EXTEND THE SEALS INTO THE STATIC PORTS.
_______ YOU CAN CAUSE DAMAGE TO THE SURFACE IN THE AREA WHEN YOU REMOVE THE SEALS.
 EFFECTIVITY

 
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 a)  The (S1) port on the upper left pitot-static probe
 b) The (S2) port on the right pitot-static probe.
 2)  Apply vacuum to captain's static system drain fitting located in main equipment center and observe that captain's altitude indicator reads approximately 100 feet above field altitude.
 3)  Remove the vinyl adhesive tape from S1 port on upper LH probe and check that reading on captain's altitude indicator drops to field altitude.
 WARNING: FAILURE TO REMOVE 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 THE PIECES OF TAPE
_______ FROM EACH PITOT-STATIC PROBE. THE SYSTEM WILL NOT OPERATE CORRECTLY WHEN THE TAPE IS IN ITS POSTITION.
 4)  Reseal S1 port on upper LH probe with vinyl adhesive tape and repeat step 2).
 CAUTION: DO NOT EXTEND THE SEALS INTO THE STATIC PORTS.
_______ YOU CAN CAUSE DAMAGE TO THE SURFACE IN THE AREA WHEN YOU REMOVE THE SEALS.
 5)  Remove the vinyl adhesive tape from S2 port on lower RH probe. Check that reading on captain's altitude indicator drops to field altitude.
 WARNING: FAILURE TO REMOVE 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 PITOT-STATIC PROBE. THE SYSTEM WILL NOT OPERATE CORRECTLY WHEN THE TAPE IS IN ITS POSITION.
 (c) First Officer's Static Cross-Manifolding Check
 EFFECTIVITY

 
 ALL  08 Page 521  Apr 25/9834-11-00
 1)

2)
3)
4)
Seal S1 port on upper RH probe and S2 port on lower LH probe with vinyl adhesive tape.
 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 IN
 AIRSPEED-SENSING AND ALTITUDE-SENSING SIGNALS,
 WHICH MAY LEAD TO LOSS OF SAFE FLIGHT.
 CAUTION:_______ DO NOT EXTEND THE SEALS INTO THE STATIC PORTS.
 YOU CAN CAUSE DAMAGE TO THE SURFACE IN THE AREA
 WHEN YOU REMOVE THE SEALS.

Apply vacuum to first officer's static system drain fitting in main equipment center. Observe that first officer's altitude indicator or vacuum gage reads approximately 100 feet above field altitude.Remove the vinyl adhesive tape from S1 port on upper RH probe. Check that reading on the first officer's altitude indicator drops to field altitude.
 WARNING: FAILURE TO REMOVE 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 THE PIECES OF TAPE
_______ FROM EACH PITOT-STATIC PROBE. THE SYSTEM WILL NOT OPERATE CORRECTLY WHEN THE TAPE IS IN ITS POSITION.
Reseal S1 port on upper RH probe with vinyl adhesive tape and repeat step 2).
 WARNING: WHEN THE STATIC PORTS ARE COVERED, MAKE SURE THAT
　
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